Rotating blockage removal device for raw coal bunkers

Abstract

A rotating blockage removal device for raw coal bunkers, comprising a protective housing (3) attached to a coal downpipe of the raw coal bunker (1), characterized in that conveyors (4) are arranged in the protective housing (3) which can be extended and retracted horizontally into the coal downpipe of the raw coal bunker (1) by means of a telescopic assembly (7), wherein scrapers (5) are arranged uniformly on the conveyors (4) and the scrapers (5) have a telescopic structure.

Description

Technical area

[0001] The present utility model belongs to the technical field of thermal power plants and relates in particular to a rotating blockage removal device for raw coal bunkers. State of the art

[0002] The electrical energy comes from thermal power plants, whose primary fuel remains hard coal. Storage bunkers for granular bulk materials are typically used to store hard coal. In the most common bulk material bunkers today, the discharge area is essentially designed as a conical or hyperbolic structure, with fixed bunker walls. However, blockages frequently occur during the discharge process, severely disrupting the normal operation of the plant. This is particularly true for the raw coal bunkers installed in the direct-feed mills of large thermal power plants. If a coal blockage occurs during the discharge process, the generator system is forced to implement an urgent power reduction and load shedding.This results in unstable combustion in the boiler system, leading to a massive use of auxiliary fuel oil; in more serious cases, the boiler combustion flame goes out and the entire system shuts down unplanned.

[0003] To address the problem of blockages caused by powdered bulk materials, research institutions, plant manufacturers, and thermal power plants have tested numerous measures. These include, for example, manually knocking down the bunker during coal conveyor interruptions, installing an integrated mechanical breaching system, mounting air cannons and vibrators on the bunker walls, using hyperbolic raw coal bunkers, and lining the inner bunker walls with stainless steel or even polyurethane (PU) panels. However, to date, none of these measures has permanently and completely solved the problem of coal blockages during the conveying process from raw coal bunkers. The occurrence of blockages during the conveying of granular bulk materials is therefore a well-known and widespread technical problem. Content of the utility model

[0004] Due to the disadvantages of the prior art, the present utility model offers a rotating blockage removal device for raw coal bunkers in order to solve the above-described problem of blockage during the discharge process in the raw coal bunkers of thermal power plants.

[0005] The present utility model offers the following technical solution: A rotating blockage removal device for raw coal bunkers comprises a protective housing that is attached to a coal downpipe of the raw coal bunker. Conveyors that can be extended horizontally into and out of the coal downpipe of the raw coal bunker by means of a telescopic assembly are arranged in the protective housing, with scrapers being evenly arranged on the conveyors and the scrapers having a telescopic structure.

[0006] Preferably, several conveyors are arranged side by side in the protective housing, with a space between two adjacent conveyors and the conveyors being driven synchronously.

[0007] Preferably, the conveyors are attached to a U-shaped support, the U-shaped support being slidably guided in the protective housing, with an opening of the U-shaped support facing the coal downpipe of the raw coal bunker. Preferably, the telescopic scrapers each comprise a knife holder and a knife body movably attached to the knife holder, wherein a magnetic telescopic rod is arranged between each knife holder and the associated knife body, magnetic rotary heads are attached to the protective housing, and the magnetic rotary heads are designed to extend and shorten the magnetic telescopic rods.

[0008] Preferably, the magnetic telescopic rods each comprise a lower cylinder and an upper rod slidably guided within the interior of the respective lower cylinder. A magnetic component is rotatably mounted in each lower cylinder, and a threaded spindle is arranged coaxially on the axis of this upper rod. A threaded bore is formed at one end of each upper rod, and the respective threaded spindle engages with the corresponding threaded bore. Preferably, a rotating chamber is formed in each lower cylinder. The corresponding magnetic component is rotatably mounted in the rotating chamber and slidably guided along the axis. An elastic component is arranged between the interior of each lower cylinder and the respective magnetic component. Preferably, a guide groove is formed in each blade holder, and a guide pin is arranged on each blade body, which is slidably guided in the corresponding guide groove.

[0009] Preferably, each guide groove comprises several interconnected guide groove sections which together form a closed loop, wherein steps are formed at the transitions of adjacent sections, a transverse groove is provided on each knife body transverse to the direction of movement and the associated guide pin is slidably guided in the respective transverse groove.

[0010] The present utility model has the following advantageous technical effects: If a blockage occurs in the coal chute of the raw coal bunker, the conveyors drive the attached scrapers into rotation, which convey the coal material they come into contact with into the protective housing, thus creating a space in the coal chute. Under the influence of gravity, the coal material flows into this space, thereby clearing the blockage.

[0011] In addition, the scrapers are telescopically designed, with the length of the scrapers being slowly extended during their rotation, thereby increasing the gap and improving the blockage removal effect. Description of the attached drawings Fig. Figure 1 is a sectional view of the present utility model; Fig. Figure 2 is a schematic representation of the interaction of conveyors, scrapers and a telescopic assembly of the present utility model; Fig. Figure 3 is a schematic representation of the structure of the wiper of the present utility model; Fig. Figure 4 is a schematic representation of the structure of a magnetic telescopic rod of the present utility model; Fig. Figure 5 is a schematic representation of the structure of a guide groove of the present utility model.

[0012] The reference numbers in the drawings have the following meaning: 1-Coal downpipe of the raw coal bunker; 2-Coal feeder; 3-Protective housing; 4-Conveyor; 5-Scrapper; 51-Knife holder; 511-Guide groove; 52-Knife body; 521-Guide bolt; 522-Transverse groove; 53-Magnetic telescopic rod; 531-Lower cylinder; 532-Upper rod; 533-Magnetic component; 534-Threaded spindle; 535-Threaded bore; 536-Elastic component; 6-Bearer; 7-Telescopic assembly; 8-Magnetic rotary head. Examples of implementation

[0013] The technical solutions in the embodiments of this utility model are described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments represent only a part of the embodiments of this utility model and not the entirety of them. Based on the embodiments of this utility model, all other embodiments that a person skilled in the art in the field could achieve without inventive activity are also entitled to protection under this utility model. Example 1:

[0014] A rotating blockage removal device for raw coal bunkers, as in Fig. 1 to Fig. As shown in section 3, it includes the following: A coal feeder 2 is arranged at a lower end of the coal downpipe of the raw coal bunker 1. A protective housing 3 is arranged on an outer side wall of the coal downpipe of the raw coal bunker 1, the protective housing 3 being connected to an interior of the coal downpipe of the raw coal bunker 1. A support 6 is guided horizontally and slidably within the protective housing 3. The support 6 is arranged horizontally and has a U-shaped structure, with an opening of the U-shaped support 6 facing the coal downpipe of the raw coal bunker 1. Several conveyors 4 are attached to the support 6, arranged horizontally side by side. In this embodiment, three conveyors 4 are provided, and the three conveyors 4 are driven synchronously via a common drive shaft.A specific distance is provided between two adjacent conveyors 4 to allow the passage of coal material. Scrapers 5 are arranged evenly along the outer side of the conveyors 4 along their path of travel. The conveyors 4 can be designed as chain conveyors, and the scrapers 5 are arranged opposite each other on the links of the chain conveyors.

[0015] A telescopic assembly 7 can be designed as a hydraulic telescopic cylinder and is attached to an outer side wall of the protective housing 3, a telescopic end of the telescopic assembly 7 is connected to the support 6, thereby driving a horizontal movement of the support 6 relative to the protective housing 3.

[0016] During the horizontal movement of the carrier 6, the opening of the U-shaped carrier 6 is directed towards the coal downpipe of the raw coal bunker 1, so that the scrapers 5 at one end of the conveyors 4 can scrape off the coal material, which facilitates the movement of the carrier 6.

[0017] As in Fig. As shown in Figure 3, each scraper 5 comprises a knife holder 51, a knife body 52, and a magnetic telescopic rod 53, wherein the knife holder 51 is attached to an outer side of the conveyor 4, the knife body 52 is guided slidably in a straight line or arc on the knife holder 51, two ends of the magnetic telescopic rod 53 are each connected to the knife holder 51 and the knife body 52, and one end of the knife body 52 is pointed. As shown in Fig. As shown in Figure 2, at least one magnetic rotary head 8 is arranged on one side of the support 6, which is away from the coal downpipe of the raw coal bunker 1. Method of operation:

[0018] In a normal state, as in Fig. As shown in Figure 1, a left part of conveyor 4 is located in the coal downpipe of the raw coal bunker 1. The relative area is less than half the radius of the coal downpipe of the raw coal bunker 1. In the extreme case, under normal conditions, conveyor 4 is located entirely within the protective housing 3 and not in the coal downpipe of the raw coal bunker 1, and a right part of conveyor 4 is located inside the protective housing 3. Conveyor 4 is in a stopped state, and the area of ​​conveyor 4 located inside the coal downpipe of the raw coal bunker 1 is small to avoid excessive disruption of the coal flow.

[0019] If a blockage occurs in the coal downpipe of the raw coal bunker 1, the conveyor 4 is driven to uniform rotation, which in turn causes the scrapers 5 attached to it to rotate in a circular motion. The rotation of the scrapers 5 draws the coal material in their vicinity into the flow, and this flow of coal material clears the blockage. Simultaneously, the scrapers 5 convey some of the coal material into the protective housing, creating a specific space within the originally compact coal material. This allows the coal material to flow towards this space, further improving its flowability.

[0020] To enhance the blockage removal effect, the telescopic assembly 7 advances the support 6 further to the middle of the coal downpipe of the raw coal bunker 1, thereby increasing the area of ​​the conveyor 4 located inside the coal downpipe of the raw coal bunker 1.

[0021] A conveying pipe (hose, not shown in the drawings) can be arranged on the protective housing 3 or the support 6, through which the coal material in the protective housing 3 is conveyed to the coal feeder 2.

[0022] If, after a rotation period of conveyor 4, the blockage removal effect in the coal downpipe of the raw coal bunker 1 is insufficient, the magnetic rotary heads 8 can be manually or automatically controlled to rotate. The rotation of the magnetic rotary heads 8 drives a telescoping action of the scrapers 5 by magnetic force; extending the length of the scrapers 5 can increase the area of ​​the space created in the coal material and thus improve the effect of the coal flow to this space.

[0023] The scrapers 5 near the magnetic rotary heads 8 are located away from the interior of the coal downpipe of the raw coal bunker 1 and are not affected by compression of the coal material. Therefore, the elastic components 536, through their elastic force, displace the magnetic components 533 upwards to the upper limit position. When the scrapers 5 move into the interior of the coal downpipe of the raw coal bunker 1 and come into contact with the coal material, the elastic components 536 are in a compressed state, and the magnetic components 533 move downwards to the lower limit position. Example 2:

[0024] This embodiment includes all the content of embodiment 1, with the following differences, as shown in the Fig. Shown 1 to 5: The magnetic telescopic rods 53 each comprise a lower cylinder 531 and an upper rod 532. The upper rods 532 are guided to be linearly displaceable within the interior of the respective lower cylinders 531 in order to adjust their combined length. A rotary chamber is formed within the interior of each lower cylinder 531, and the magnetic components 533 are adapted to the respective rotary chamber. The magnetic components 533 are rotatably mounted in the rotary chambers about the central axis in the direction of movement of the upper rods 532 and can also be guided to be displaceably displaceable in the rotary chambers along the direction of movement of the upper rods 532. Coaxial threaded spindles 534 are arranged on each of the magnetic components 533. At one end of each upper rod 532, a threaded bore 535 is formed, and the threaded spindles 534 are each engaged with the corresponding threaded bores 535 in a threaded engagement. Elastic components 536 are arranged between the magnetic components 533 and the interior of the respective lower cylinders 531.

[0025] The rotation of the magnetic rotary heads 8 sets the magnetic components 533 within a group of scrapers 5, located on the conveyors 4 closest to the magnetic rotary heads 8, into rotation relative to their rotating chambers. The magnetic rotary heads 8 interact with the magnetic components 533 by magnetic attraction. Due to the interaction of the threaded spindles 534 and the threaded bores 535, the rotation of the magnetic components 533 causes the upper rods 532 to be displaced relative to the lower cylinders 531. This controls the telescoping of the magnetic telescopic rods 53, allowing the knife bodies 52 to be moved relative to the knife holders 51 and thus the length of the scrapers 5 to be adjusted.

[0026] The remaining wipers 5, which move away from the magnetic rotary heads 8, are not affected by the rotating magnetic rotary heads 8. The wipers 5 with extended length can further increase the area of ​​the previously created gap.

[0027] If it is determined that the conveyors 4 and the magnetic rotary heads 8 rotate uniformly, the scrapers 5 can be extended by a specific distance during a complete circular rotation. This results in a quantitative extension of the scrapers 5, so that the area of ​​the created gap gradually increases. Compared to a single increase, a gradual increase in the created gap increases the likelihood and effectiveness of the clogged coal material flowing into this space.

[0028] As in Fig. 3 and Fig. As shown in Figure 5, each knife body 52 has a transverse groove 522. The transverse grooves 522 extend perpendicular to the direction of movement of the corresponding knife bodies 52, and the fixed ends of the guide pins 521, which have a cylindrical structure, are slidably guided in the corresponding transverse grooves 522. The guide pins 521 are designed as elastic telescopic rods that exhibit a tendency to elongate.

[0029] On the inner side wall of each knife holder 51 is a [missing information] as in Fig. The guide groove 511 shown in Figure 5 is formed. The guide grooves 511 each have a closed loop structure and comprise several interconnected guide groove sections, with step structures formed at the transitions of adjacent guide groove sections as shown by the red lines in Figure 5. Fig. Figure 5 shows the movable ends of the guide pins 521 being slidably guided in the associated guide groove sections, and due to the stepped structures, the movable ends of the guide pins 521 can only be moved unilaterally in the direction shown in the individual guide groove sections. Fig. Move the 5 arrows shown. Method of operation:

[0030] As in Fig.As shown in Figure 5, the movable ends of the guide pins 521 are in their initial position. When the scrapers 5 move near the magnetic rotary heads 8, the rotating magnetic rotary heads 8 drive an extension of the magnetic telescopic rods 53. This causes the knife bodies 52 to move relative to the knife holders 51 and increase their combined length. During this process, the guide pins 521 move in the direction of the arrow from the first guide groove section to the beginning of an adjacent second guide groove section. The stepped structure formed by the end of the first guide groove section and the beginning of the second guide groove section prevents a backward movement. At this point, the length of the scrapers 5 cannot be extended further, even if the magnetic telescopic rods 53 are still influenced by the rotating magnetic rotary heads 8.

[0031] The scrapers 5 are moved by the conveyors 4 into the interior of the coal downpipe of the raw coal bunker 1 to scrape off the coal. The coal exerts a counterforce on the scrapers 5, causing the elastic components 536 to be compressed and the magnetic telescopic rods 53 to shorten by a short distance. This causes the movable ends of the guide pins 521 to move in the second guide groove sections, with the fixed ends of the guide pins 521 moving in the associated transverse grooves 522 to accommodate this movement.

[0032] By repeatedly performing the above processes, the scrapers 5 can be extended by a specific length during a complete circular rotation driven by the conveyors 4. This length can be controlled differently depending on the length of the associated guide groove sections. The above design prevents a single scraper 5 from remaining too close to the rotating magnetic rotary heads 8 for too long due to a blockage of the conveyors 4, thus preventing its length from being excessively increased in a single instance.

[0033] Once the scrapers 5 have extended to their maximum length, they return to their starting position as soon as the next force is exerted on the scrapers 5 by the carbon material.

[0034] The foregoing descriptions of the exemplary embodiments serve only to illustrate the present utility model. While their description is more detailed and precise, this must not be interpreted as limiting the scope of protection of this utility model. It should be noted that the person skilled in the art in this field can make several modifications and improvements without deviating from the inventive concept of this utility model, all of which fall within the scope of protection of this utility model.

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