Ash conveying device for ash removal system of thermal power plant

Abstract

The utility model relates to the technical field of wet ash conveying, and discloses an ash conveying device for an ash removal system of a thermal power plant, which comprises an ash silo and a double-shaft stirrer, an ash conveying pipeline is arranged between the ash silo and the double-shaft stirrer, and an ash outlet of the ash silo and a feed inlet of the double-shaft stirrer are respectively communicated with the ash conveying pipeline. A quick-closing pneumatic valve and a manual regulating valve are sequentially arranged on the ash conveying pipeline; a cleaning mechanism used for cleaning the feeding port is arranged in the double-shaft stirrer and comprises a scraper assembly, a driving assembly and a transmission assembly located between the scraper assembly and the driving assembly, and the driving assembly controls the scraper assembly to move along the inner wall of the feeding port through the transmission assembly; a telescopic rod used for controlling the cleaning mechanism to move horizontally is arranged between the double-shaft stirring machine and the cleaning mechanism. In practical application, the double-shaft stirrer solves the problems of high cleaning difficulty and high cost of deposited scale at the feeding hole of the double-shaft stirrer, increases the ash inlet amount, and improves the wet ash discharge efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to wet ash conveying technical field, concretely relates to a kind of ash conveying device for ash removal system of thermal power plant. BACKGROUND

[0002] In the production process of thermal power plant, fly ash after combustion is usually stored in ash silo first, then unloading and discharging operation is carried out, and the current common discharging mode mainly has dry ash discharging and wet ash discharging two kinds. Among them, the process of wet ash discharging is to mix fly ash with water by means of double-shaft mixer, so as to form wet ash.

[0003] However, the existing double-shaft mixer exposes a series of serious problems in actual operation. When stirring operation, fly ash and stirring water will splash to the inlet, which causes the inner wall of inlet to easily accumulate ash scale. With the passage of time, the continuous accumulation of ash scale will gradually reduce the cross-sectional flow area of inlet, and then cause the ash feeding amount of double-shaft mixer to be greatly reduced, finally the overall wet ash discharging efficiency is seriously affected, which cannot meet the efficient needs of production.

[0004] Moreover, when cleaning and maintaining the inlet, the connection between the double-shaft mixer and the ash silo needs to be disassembled. This process not only is complicated and tedious, consumes a lot of manpower, material resources and time cost, but also has low cleaning efficiency. At the same time, due to the difficulty of cleaning, the cleaning cycle is long, which further increases the maintenance cost of equipment and the stagnation time of production, resulting in high cost consumption of the whole production process. UTILITY MODEL CONTENTS

[0005] The utility model intends to provide an ash conveying device for ash removal system of thermal power plant, to solve the problems of ash scale accumulation in the inlet of double-shaft mixer for wet ash discharging of existing thermal power plant, low ash feeding amount and wet ash discharging efficiency, and complicated cleaning operation, long cycle and high cost.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an ash conveying device for ash removal system of thermal power plant, comprising an ash silo and a double-shaft mixer, an ash conveying pipeline is arranged between the two, the ash outlet of the ash silo and the inlet of the double-shaft mixer are communicated with the ash conveying pipeline, a quick closing pneumatic valve and a manual regulating valve are arranged on the ash conveying pipeline in sequence; a cleaning mechanism for cleaning the inlet is arranged in the double-shaft mixer, the cleaning mechanism comprises a scraper assembly, a driving assembly and a transmission assembly therebetween, the driving assembly controls the scraper assembly to move along the inner wall of the inlet through the transmission assembly; a telescopic rod for controlling the horizontal movement of the cleaning mechanism is arranged between the double-shaft mixer and the cleaning mechanism.

[0007] The principle and advantages of the present scheme are as follows:

[0008] 1. In practical applications, the scraper assembly in this solution, driven by the drive and transmission components, moves along the inner wall of the feed inlet, scraping away accumulated ash and dirt. This eliminates the need to disassemble the connection between the twin-shaft mixer and the ash silo, as is done in traditional methods, greatly simplifying the cleaning process. Operators no longer need to spend significant time and effort on complex disassembly and installation, saving labor costs. Furthermore, the ease of cleaning allows for on-demand cleaning, shortening the cleaning cycle. Frequent cleaning effectively removes ash and dirt, preventing equipment malfunctions caused by severe buildup, reducing downtime for cleaning, and further lowering maintenance costs and production losses due to downtime.

[0009] In traditional ash conveying devices, airlocks are installed between the twin-shaft mixers. Their output is limited by their own structural principle, making it difficult to increase speed when facing the ever-growing production demand, and thus difficult to meet the actual production needs. In addition, airlocks have many defects in actual operation: (1) The dynamic and static seals of airlocks adopt the packing seal method. Under complex working conditions, ash leakage is very likely to occur, causing serious pollution to the on-site production environment, affecting environmentally civilized production, and posing a threat to the health of operators. (2) There may be foreign objects or caking materials in fly ash. When passing through the airlock, they are easy to accumulate inside it, resulting in a slower unloading speed or even a complete stop in unloading, which greatly affects the wet ash discharge efficiency. (3) As a key component supporting the rotating parts, the bearings of the airlock are easily damaged by long-term use, insufficient lubrication, or excessive axial and radial forces. This not only seriously reduces the reliability of the airlock operation, but also increases the workload of inspection and maintenance.

[0010] In comparison, this solution has the following advantages:

[0011] 2. In this solution, the airlock is removed and a manual regulating valve is installed. The manual regulating valve itself has a simpler and more reliable structure, unlike the airlock which frequently fails, reducing the frequency of maintenance and ensuring more consistent and stable wet ash discharge. Furthermore, the manual regulating valve allows for free adjustment of the ash delivery rate according to production needs, eliminating the limitations imposed by the airlock's structural principle. This increases the ash discharge rate of the twin-shaft mixer, resulting in faster material discharge and improved efficiency in wet ash unloading. With the cooperation of the cleaning mechanism, the ash intake of the twin-shaft mixer remains stable, helping to maintain normal equipment operation, further enhancing equipment reliability, reducing the frequency of equipment failures, and thus lowering the workload of maintenance. Secondly, the manual regulating valve has excellent sealing performance, making the unloading environment more environmentally friendly and hygienic, reducing environmental pollution.

[0012] The quick-close pneumatic valve installed on the ash conveying pipeline can quickly respond when abnormal conditions occur in the equipment, cut off the ash conveying channel in a very short time, prevent the coal ash from continuing to be conveyed, effectively avoid the secondary damage caused by the continuous impact of the coal ash on the equipment after the failure of the double-shaft mixer, and prolong the service life of the equipment.

[0013] 3、The cleaning mechanism solves the problem of dirt accumulation in the feed inlet, ensures the stability of the cross-sectional flow area of the feed inlet, and thus ensures the stability of the ash feeding amount of the double-shaft mixer; in addition, the manual regulating valve can increase the ash discharging amount to the maximum under the premise of ensuring safe operation without exceeding the motor current, increase the output of the double-shaft mixer from 200T / h to 300T / h, greatly improve the efficiency of wet ash discharge, shorten the equipment operation time, and reduce the power consumption. Moreover, with the increase of the wet ash discharge conveying amount, the accumulation pressure of the ash storage is effectively reduced, and the safety hidden danger caused by the excessive accumulation of coal ash in the ash storage, such as ash storage collapse, is reduced. At the same time, the operation efficiency and safety of the entire ash removal system of the thermal power plant are significantly improved, which provides strong support for the stable production of the thermal power plant.

[0014] 4、The telescopic rod for controlling the horizontal movement of the cleaning mechanism is arranged between the double-shaft mixer and the cleaning mechanism, the cleaning mechanism is moved to the feed inlet by the telescopic rod when the ash dirt needs to be cleaned, and the cleaning mechanism is moved away from the feed inlet by the telescopic rod when cleaning is not needed, so that the ash discharging is not hindered, the feed inlet is ensured to be unobstructed, the ash conveying device operates normally, and the wet ash discharge is stable and continuous.

[0015] Further, the scraper assembly comprises a fixed cylinder with an upward opening, a support block is slidably connected in the fixed cylinder, a magnetic block is arranged at the bottom of the support block, an electromagnet for attracting the magnetic block is arranged on the bottom wall of the fixed cylinder, and an electromagnetic valve is connected to the electromagnet to control the power-on and power-off of the electromagnet; a limiting spring is fixedly connected between the support block and the bottom wall of the fixed cylinder; a plurality of cleaning rods are hingedly connected to the upper end of the support block, and a scraper is connected to the other end of each cleaning rod.

[0016] In the above arrangement, when the electromagnetic valve is powered on, the electromagnet attracts the magnetic block, and thus drives the support block and the cleaning rods and scrapers thereon to fold into the fixed cylinder; when the electromagnetic valve is powered off, the electromagnet releases the attraction of the magnetic block, and the compression force of the limiting spring pushes the support block, the cleaning rods and the scrapers out of the fixed cylinder, and then the cleaning rods disperse outward according to the hinge points with the support block, so that the scrapers contact the inner wall of the feed inlet to scrape off the ash dirt; the above design does not require complex mechanical structures or manual intervention, and the scraper assembly can be quickly switched between the working state and the non-working state, which is simple and convenient to operate, reduces the cleaning cost, and the scraper assembly is completely folded in the non-working state without hindering the normal ash discharging, effectively ensuring the efficiency of wet ash discharge.

[0017] Further, the scraper is hinged to the end of the cleaning rod.

[0018] The above arrangement makes the scraper more flexible and adaptable, not only can flexibly adjust the angle to meet the different angle of the feed inlet inner wall and realize complete fit, but also can more effectively clean the accumulated dirt in the complex parts such as corners and gaps on the feed inlet inner wall formed by long-term use, to ensure the cleaning quality and efficiency; secondly, the hinge design allows the scraper to buffer the impact force encountered during cleaning by rotating, reducing wear and cost.

[0019] Further, the transmission assembly includes a bevel gear system, the bevel gear system includes a first bevel gear and a second bevel gear meshing with each other, the first bevel gear is fixedly connected with the output shaft of the driving motor, a connecting rod is vertically arranged on the second bevel gear, and the upper end of the connecting rod is connected with the scraper assembly; the outer part of the transmission assembly is provided with a protective shell, the protective shell is provided with a through hole for the output shaft and the connecting rod to pass through, and a rotating bearing is arranged in the through hole.

[0020] The above arrangement converts the power transmission direction through the bevel gear system, ensures that the power can be transmitted to the scraper assembly under the condition of narrow and effective internal space of the double-shaft mixer, realizes the working requirements without a large amount of internal space, and does not interfere with the movement of other parts, thereby ensuring the normal operation of the double-shaft mixer.

[0021] Further, the end of the telescopic rod towards the cleaning mechanism is bolted with a connecting plate, the driving motor is fixed on the connecting plate, the connecting plate is provided with a fixed rod on the upper side of the driving motor, a fixed plate is connected to the end of the fixed rod, a through hole is opened on the fixed plate, a fixed cylinder is located in the through hole and is rotationally connected with the fixed plate, a positioning block is arranged on the outer wall of the fixed cylinder, and the positioning block is placed on the fixed plate.

[0022] The above arrangement realizes the supporting effect of the fixed cylinder and the second bevel gear through the connecting plate, the fixed rod and the fixed plate, and ensures that the first bevel gear and the second bevel gear move synchronously and horizontally when the telescopic rod drives the entire cleaning mechanism to move through the connecting plate, so that the engagement state is always maintained, and the stability and reliability of the cleaning mechanism are improved.

[0023] Further, the manual regulating valve is a one-way valve. The one-way valve design ensures that the fly ash can only flow from the ash storage to the double-shaft mixer in a set direction, thereby ensuring the continuity and stability of the ash conveying process. This not only helps to maintain the stability of the ash feeding amount of the double-shaft mixer and improve the wet ash discharge efficiency, but also reduces the damage to the equipment caused by material backflow and prolongs the service life of the equipment.

[0024] Further, the scraper is made of elastic material. The scraper made of elastic material can significantly improve the cleaning effect. When cleaning the dirt accumulated on the inner wall of the feeding port, the surface of the inner wall of the feeding port can not be flat, and there are some uneven parts. The scraper made of elastic material has good flexibility and deformation ability, which can better fit these irregular surfaces, deeply into the gap and corner, and clean the accumulated dirt more thoroughly; and the elastic material can also reduce the wear of the scraper on the inner wall of the feeding port, prolong the service life of the equipment and the scraper.

[0025] Further, the feeding port is provided with a liquid injection port, and a cleaning pipe is connected to the liquid injection port, and a cleaning liquid is conveyed in the cleaning pipe. The cleaning liquid conveyed through the cleaning pipe and the liquid injection port can dissolve or soften the dirt, so that the scraping and cleaning are more thorough, and the cleaning efficiency is improved.

[0026] Further, the ash tank is provided with a maintenance isolation valve at the discharge port. When maintenance is performed, the maintenance isolation valve is only needed to be closed to cut off the material conveying channel between the ash tank and the double-shaft mixer, so that no fly ash flows out of the ash tank during the maintenance process, which avoids the safety threat to the maintenance personnel caused by material leakage, and provides a safe and clean working environment for the maintenance work. At the same time, the setting of the maintenance isolation valve can reduce the downtime of the entire ash removal system caused by equipment maintenance, and improve the utilization rate of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic view of the overall structure of the embodiment of the utility model.

[0028] Figure 2 It is a schematic view of the double-shaft mixer feeding port of the embodiment of the utility model. Figure 1 .

[0029] Figure 3 It is a partial enlarged view of part A of the embodiment of the utility model. Figure 2

[0030] Figure 4 It is a schematic view of the double-shaft mixer feeding port of the embodiment of the utility model. Figure 2 .

[0031] Figure 5 It is a sectional view of the scraper assembly in the unfolded state of the embodiment of the utility model.

[0032] Figure 6 It is a sectional view of the scraper assembly in the folded state of the embodiment of the utility model.

[0033] Figure 7 It is a top view of the scraper assembly of the embodiment of the utility model (structure after removing the top cover). DETAILED DESCRIPTION ​

[0034] The specific embodiments are further described in detail below:

[0035] The reference signs in the drawings of the specification include: ash storage 1, double-shaft mixer 2, feed inlet 21, ash conveying pipeline 3, maintenance isolation valve 4, quick-closing pneumatic valve 5, manual regulating valve 6, cleaning mechanism 7, scraper assembly 71, fixed cylinder 711, support block 712, cleaning rod 713, scraper 714, magnetic block 715, electromagnet 716, limiting spring 717, sliding block 718, sliding groove 719, telescopic support rod 7110, top cover 7111, tension spring 7112, drive assembly 72, drive motor 721, transmission assembly 73, first bevel gear 731, second bevel gear 732, connecting rod 733, liquid injection port 8, telescopic rod 9, connecting plate 10, guide block 11, guide groove 12, fixed rod 13, fixed plate 14, positioning block 15, protective box 16.

[0036] The embodiments are substantially as shown in the accompanying Figures 1-7 drawings:

[0037] In combination with the accompanying Figure 1 , Figure 2 drawings, an ash conveying device for a coal-fired power plant ash removal system includes an ash storage 1 and a double-shaft mixer 2, with an ash conveying pipeline 3 provided therebetween, the ash outlet of the ash storage 1 and the feed inlet 21 of the double-shaft mixer 2 being in communication with the ash conveying pipeline 3, and a quick-closing pneumatic valve 5 and a manual regulating valve 6 being provided in sequence on the ash conveying pipeline 3; the double-shaft mixer 2 is provided with a cleaning mechanism 7 for cleaning the feed inlet 21, the cleaning mechanism 7 including a scraper assembly 71, a drive assembly 72, and a transmission assembly 73 provided therebetween, the drive assembly 72 controlling the movement of the scraper assembly 71 along the inner wall of the feed inlet 21 through the transmission assembly 73; a telescopic rod 9 is provided transversely on the double-shaft mixer 2, one end of the telescopic rod 9 being connected to the double-shaft mixer 2 and the other end being fixed to the cleaning mechanism 7 to control the horizontal movement of the cleaning mechanism 7, the telescopic rod 9 being a hydraulic telescopic rod 9 or an electric telescopic rod 9.

[0038] Preferably, the manual regulating valve 6 is a one-way valve, ensuring that the fly ash can only flow from the ash storage 1 to the double-shaft mixer 2 in a set direction, thereby ensuring the continuity and stability of the ash conveying process.

[0039] In combination with the accompanying Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the scraper assembly 71 comprises an upwardly open fixed cylinder 711, a support block 712 is slidingly connected in the fixed cylinder 711, the support block 712 is provided with sliding blocks 718 on the left and right sides, a sliding groove 719 for the sliding blocks 718 to slide is opened on the inner wall of the fixed cylinder 711, the sliding groove 719 does not penetrate through the top of the fixed cylinder 711, the bottom of the sliding block 718 is fixed with a telescopic supporting rod 7110, the other end of the telescopic supporting rod 7110 is connected with the fixed cylinder 711. A magnetic block 715 is embedded in the bottom of the support block 712, and an electromagnet 716 for attracting the magnetic block 715 is arranged on the bottom wall of the fixed cylinder 711, and an electromagnetic valve is connected to the electromagnet 716 to control the power-on and power-off of the electromagnet 716; a limiting spring 717 is fixedly connected between the support block 712 and the bottom wall of the fixed cylinder 711, the limiting spring 717 is a compression spring, the attracting force of the electromagnet 716 on the magnetic block 715 is greater than the elastic force of the maximum compression degree of the limiting spring 717, and when the limiting spring 717 is in a natural state, the hinge point of the support block 712 and the cleaning rod 713 is not lower than the top surface of the fixed cylinder 711.

[0040] The upper end of the support block 712 is hingedly connected with a plurality of cleaning rods 713, the plurality of cleaning rods 713 are arranged in a ring shape and uniformly around the support block 712, the other end of each cleaning rod 713 is connected with a scraper 714, the scraper 714 is made of elastic material, the scraper 714 is trapezoidal and has a blade shape on one side of the inner wall of the feed inlet 21, so as to more effectively scrape off the ash dirt. Preferably, the scraper 714 is hingedly connected with the end of the cleaning rod 713, so that the scraper 714 has stronger flexibility and adaptability, can meet the inner wall of the feed inlet 21 at different angles and achieve complete adhesion, can also more effectively clean the accumulated dirt in complex parts such as corners and gaps, and ensure the cleaning quality and efficiency.

[0041] A top cover 7111 is arranged above the fixed cylinder 711, the top cover 7111 is composed of a plurality of fan-shaped covers hingedly connected with the top end of the fixed cylinder 711, the plurality of fan-shaped covers form a circular structure, and a tension spring 7112 is connected to the inner wall of the fixed cylinder 711 at the bottom of each fan-shaped cover, so as to prevent fly ash from entering the inside of the fixed cylinder 711.

[0042] In combination Figure 2 , Figure 3 As shown, the driving assembly 72 comprises a driving motor 721, the output shaft of the driving motor 721 is fixed with a transmission assembly 73, and preferably, a speed reducer (not shown in the figure) is further arranged between the transmission assembly 73 and the driving motor 721, the speed reducer can reasonably adjust the rotating speed and torque of the driving motor 721 according to actual working requirements, optimally match the power of the driving motor 721, provide appropriate rotating speed and torque, and ensure that the scraper assembly 71 can work in the best working state.

[0043] In combination Figure 4As shown, the transmission assembly 73 includes a bevel gear system, including a first bevel gear 731 and a second bevel gear 732 meshing with each other, the first bevel gear 731 is fixedly connected with the output shaft of the driving motor 721, a connecting rod 733 is vertically arranged on the second bevel gear 732, and the upper end of the connecting rod 733 is connected with the scraper assembly 71; The outside of the transmission assembly 73 is provided with a protective shell (not shown in the figure), so as to prevent the fly ash from causing the bevel gear system to be stuck in engagement. The protective shell is provided with through holes for the output shaft of the driving motor 721 and the connecting rod 733 to pass through, and a rotating bearing is arranged in the through hole to reduce the rotating friction.

[0044] In combination Figure 3 As shown, the end of the telescopic rod 9 towards the cleaning mechanism 7 is bolted with a connecting plate 10, the driving motor 721 is fixed on the connecting plate 10, the connecting plate 10 is provided with a fixed rod 13 on the upper side of the driving motor 721, the end of the fixed rod 13 is connected with a fixed plate 14, the fixed plate 14 is provided with a through hole, the fixed cylinder 711 is located in the through hole and is rotationally connected with the fixed plate 14, the outer wall of the fixed cylinder 711 is provided with a positioning block 15, and the positioning block 15 is placed on the fixed plate 14, so as to realize the supporting effect of the fixed cylinder 711 and the second bevel gear 732, and ensure the synchronous horizontal movement of the first bevel gear 731 and the second bevel gear 732, and always keep the engagement state.

[0045] In combination Figure 3 As shown, the double-shaft mixer 2 is provided with a protective box 16, and the cleaning mechanism 7 is located in the protective box 16. One side of the protective box 16 is provided with a through port for the scraper assembly 71 to enter and exit, and a flap is hingedly connected at the through port. The flap blocks the fly ash while not hindering the entry and exit of the scraper assembly 71. The bottom wall of the protective box 16 is provided with a guide groove 12, and the bottom of the connecting plate 10 is provided with a guide block 11 which slides in the guide groove 12. In the non-cleaning state, the protective box 16 protects the cleaning mechanism 7, reducing fly ash pollution; in the cleaning state, the scraper assembly 71 moves to the outside of the protective box 16, and at the same time, the protective box 16 supports the connecting plate 10, ensuring the stability of the entire cleaning mechanism 7 and improving the cleaning efficiency.

[0046] The liquid injection port 8 is externally connected with a cleaning pipe, and the cleaning pipe is used to transport cleaning liquid. During the operation of the equipment, the liquid injection port 8 is not connected with the cleaning pipe but is sealed by plugging. The cleaning liquid can dissolve or soften the ash, making the scraping and cleaning more thorough and improving the cleaning efficiency.

[0047] The discharge port of the ash storage bin 1 is provided with a maintenance isolation valve 4. The maintenance isolation valve 4 is a flashboard valve. During maintenance, the maintenance isolation valve 4 is only needed to be closed to cut off the material conveying channel between the ash storage bin 1 and the double-shaft mixer 2, ensuring that no fly ash flows out of the ash storage bin 1 during the maintenance process, and avoiding the safety threat to the maintenance personnel caused by material leakage.

[0048] Specific working principle: when the feeding port 21 of the double-shaft mixer 2 needs to be cleaned, the quick-acting pneumatic valve 5 is closed, the ash is stopped, the telescopic rod 9 is started to extend to move the cleaning mechanism 7 as a whole, the scraper assembly 71 is moved to coincide with the axis of the feeding port 21, then the electromagnetic valve is closed, the magnetic block 715 is released from the adsorption of the electromagnet 716, the compression elastic force of the limiting spring 717 pushes the support block 712, the cleaning rod 713 and the scraper 714 upwards until the hinge point of the cleaning rod 713 and the support rod is located outside the fixed cylinder 711, the cleaning rod 713 is scattered around under the action of gravity, the scraper 714 contacts the inner wall of the feeding port 21, then the driving motor 721 is started, the scraper 714 is driven to rotate through the transmission assembly 73, and the ash on the inner wall of the feeding port 21 is scraped off.

[0049] After cleaning, the driving motor 721 is closed, the electromagnetic valve is opened, the electromagnet 716 is powered to adsorb the magnet, and then the support block 712 is moved downwards, when the support block 712 moves downwards, the cleaning rod 713 hinged thereon is gradually collected into the fixed cylinder 711, and the telescopic rod 9 is retracted to drive the cleaning mechanism 7 to reset.

[0050] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of characteristics in the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. An ash conveying device for an ash removal system in a thermal power plant, comprising an ash silo and a twin-shaft mixer, with an ash conveying pipeline connecting the two, the ash outlet of the ash silo and the feed inlet of the twin-shaft mixer respectively connected to the ash conveying pipeline, characterized in that: The ash conveying pipeline is sequentially provided with a quick closing pneumatic valve and a manual regulating valve; the double-shaft mixer is internally provided with a cleaning mechanism for cleaning the feeding port, the cleaning mechanism comprising a scraper assembly, a driving assembly and a transmission assembly located between the scraper assembly and the driving assembly, the driving assembly controlling the scraper assembly to move along the inner wall of the feeding port through the transmission assembly; the double-shaft mixer and the cleaning mechanism are provided with an extension rod for controlling the horizontal movement of the cleaning mechanism.

2. A coal ash conveying device for ash handling system of a thermal power plant as claimed in claim 1, wherein: The scraper assembly comprises a fixed cylinder with an upward opening, the fixed cylinder being slidably connected with a support block, the bottom of the support block being provided with a magnetic block, the bottom wall of the fixed cylinder being provided with an electromagnet for attracting the magnetic block, the electromagnet being connected with a solenoid valve for controlling the power-on and power-off of the electromagnet; the support block and the bottom wall of the fixed cylinder are fixedly connected with a limiting spring; the upper end of the support block is hingedly connected with a plurality of cleaning rods, the other end of the cleaning rods being connected with scrapers, the plurality of cleaning rods being uniformly arranged in a ring around the support block.

3. A dust conveying device for a dust removal system of a thermal power plant according to claim 2, characterized in that: The scraper is hingedly connected with the end of the cleaning rod.

4. A dust conveying device for a dust removal system of a thermal power plant according to claim 3, characterized in that: The transmission assembly comprises a bevel gear system, the bevel gear system comprising a first bevel gear and a second bevel gear which are in mesh with each other, the first bevel gear being fixedly connected with the output shaft of the driving motor, the second bevel gear being vertically provided with a connecting rod, the upper end of the connecting rod being connected with the scraper assembly; the transmission assembly is externally provided with a protective shell, the protective shell being provided with through holes for the output shaft and the connecting rod to pass through, the through holes being provided with rotating bearings.

5. A dust conveying device for a dust removal system of a thermal power plant according to claim 4, characterized in that: The end of the extension rod towards the cleaning mechanism is bolted with a connecting plate, the driving motor being fixed on the connecting plate, the connecting plate being provided with a fixed rod on the upper side of the driving motor, the end of the fixed rod being connected with a fixed plate, the fixed plate being provided with a through hole, the fixed cylinder being located in the through hole and being rotatably connected with the fixed plate, the outer wall of the fixed cylinder being provided with a positioning block, the positioning block being placed on the fixed plate.

6. A dust conveying device for ash handling system of thermal power plant as claimed in any one of the claims 1 to 5 wherein: The manual regulating valve is a one-way valve.

7. A dust conveying device for a dust removal system of a thermal power plant according to claim 3, characterized in that: The scraper is made of an elastic material.

8. A dust conveying device for a dust removal system of a thermal power plant according to claim 6, characterized in that: The feeding port is provided with a liquid injection port, the liquid injection port being connected with a cleaning pipe, the cleaning pipe being provided with a cleaning liquid.

9. A dust conveying device for a dust removal system of a thermal power plant according to claim 1, characterized in that: The ash storage is provided with an overhauling isolation valve at the discharge port.

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