Coal conveying device for power plant

Abstract

The invention relates to the technical field of coal transportation, and particularly discloses a coal conveying device for a power plant, which comprises a supporting seat, a supporting assembly is arranged at the top of the supporting seat, a discharging hopper is arranged at the top of the supporting assembly, and a conveying assembly and a discharging assembly are arranged in the supporting assembly. The conveying assembly comprises a mounting mechanism, a conveying mechanism and a stepping motor; the conveying mechanism is slidably mounted among the multiple supporting blocks through the mounting mechanism, and springs arranged in the supporting blocks can play a buffering role so as to reduce impact of coal on the transmission belt and the screening roller during discharging operation, so that the service life of the transmission belt and the screening roller can be prolonged, and the conveying efficiency is improved. The coal dust screening device has the advantages that the coal dust screening device is simple in structure, the coal damage probability can be reduced, coal dust generation is reduced, meanwhile, coal dust screening can be achieved by means of gaps among the screening rollers, the dust content of coal in the conveying process is reduced, and the problem of unstable combustion caused by dust filling is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal transportation, and particularly relates to a coal conveying device for a power plant. Background Art

[0002] A power plant is an important place for energy conversion and requires a large amount of coal as fuel for power generation. The sources of coal are usually coal mines or coal ports, while power generation equipment such as boilers in the power plant is located at fixed positions within the plant area. In order to efficiently and stably transport coal from storage locations (such as coal yards) to the power generation equipment, a coal conveying device is needed. As a widely used conveying equipment, the belt conveyor can well meet the transportation requirements of bulk materials such as coal and plays a key role in the coal conveying system of the power plant.

[0003] Existing belt conveyors have many drawbacks during the conveying process. On the one hand, they cannot screen coal particles and dust. When coal falls on the conveyor belt, it will cause impact, which will not only shorten the service life of the conveyor belt but also damage some coal, thus generating new coal dust. Since coal dust is very fine, too much dust is easily scattered during transportation, which will have many adverse effects on the working environment and the health of workers. On the other hand, during the combustion of the filler, coal dust will be carried away by the air flow, resulting in incomplete combustion. At the same time, coal dust will also make the flame unstable, showing situations such as flickering and deflagration, which will not only reduce the combustion efficiency but also damage the power generation equipment.

[0004] Therefore, a coal conveying device for a power plant is needed to solve the above problems. Summary of the Invention

[0005] The main object of the present invention is to provide a coal conveying device for a power plant, which can effectively solve the problems in the background art.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A coal conveying device for a power plant includes a support base. A support assembly is arranged on the top of the support base. A feeding hopper is arranged on the top of the support assembly. A conveying assembly and a feeding assembly are arranged inside the support assembly. The conveying assembly includes a mounting mechanism, a conveying mechanism, and a stepping motor; The support assembly includes support blocks uniformly and fixedly connected to the support base. A slider is slidably connected inside the support block. A spring is fixedly connected between the bottom of the slider and the support block. The sliders are all fixedly connected to a mounting plate; The mounting mechanism includes symmetrically arranged mounting plates. A material guiding seat is fixedly connected between the two mounting plates. Sealing plates are symmetrically and fixedly connected to the bottom of the material guiding seat. The same bottom plate is fixedly connected to the bottom of the sealing plates; The conveying mechanism includes a driving roller, a first driven roller, and a second driven roller that are sequentially rotatably connected between two mounting plates. A conveyor belt is drivingly connected between the driving roller and the first driven roller, and transmission belts are symmetrically drivingly connected between the driving roller and the second driven roller. Screening rollers are uniformly fixedly connected between the two transmission belts, and a screening plate is fixedly connected between the two mounting plates; The stepping motor is fixedly installed on the mounting plate and is fixedly connected to the driving roller through a coupling. The feeding hopper is fixedly connected to the support block.

[0007] As a further improvement of the above solution, the feeding assembly includes a fixed seat fixedly connected to the bottom of the bottom plate and a three-phase asynchronous motor. A feeding cylinder is fixedly connected inside the fixed seat. A spiral blade is rotatably connected inside the feeding cylinder. The output end of the three-phase asynchronous motor is fixedly connected to a driving shaft through a coupling. The spiral blade and the driving shaft are drivingly connected through a reducer, and an eccentric block is fixedly connected to the outside of the driving shaft.

[0008] As a further improvement of the above solution, annular grooves with an isosceles trapezoid cross-section are opened on the outer sides of the driving roller and the first driven roller, and a feeding groove is opened at one end of the screening plate close to the conveyor belt.

[0009] As a further improvement of the above solution, the mounting mechanism further includes fixing plates and scraping plates symmetrically fixedly connected to the outer side wall of the material guiding seat. An arc-shaped groove adapted to the driving roller is opened at one end of the scraping plate away from the fixing plate. The fixing plates and the scraping plates are both fixedly connected to the bottom plate.

[0010] As a further improvement of the above solution, protective plates are fixedly connected to the tops of the mounting plates, and the protective plates are in mutual contact with the transmission belts.

[0011] As a further improvement of the above solution, guide plates are symmetrically fixedly connected inside the fixed seat, and a feeding sleeve is fixedly connected between the two guide plates. The feeding sleeve is fixedly communicated with the feeding cylinder.

[0012] As a further improvement of the above solution, a limiting rod is fixedly connected inside the support block, and the slider is slidably connected to the outside of the limiting rod.

[0013] As a further improvement of the above solution, square grooves adapted to the transmission belts are opened at the bottoms of the fixing plates and the scraping plates, and the transmission belts are slidably connected inside the square grooves.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The screening rollers are evenly installed between two conveyor belts, jointly constituting a part of the conveying mechanism. Then, this conveying mechanism is slidably installed between multiple support blocks through an installation mechanism. The springs provided inside the support blocks can play a buffering role, so as to reduce the impact of coal on the conveyor belt and the screening rollers during the feeding operation. Thus, not only can the service life of the conveyor belt and the screening rollers be extended, but also the damage probability of coal can be reduced, and the generation of coal dust can be decreased. At the same time, relying on the gaps between the screening rollers, the screening of coal dust can be realized, thereby reducing the dust content of coal during the conveying process and solving the problem of unstable combustion caused by dust filling. The material guiding seat and the screening plate cooperate with each other to screen out dust during the coal conveying process. The screened dust falls into the fixed seat at the bottom and flows into the feeding cylinder along the fixed seat, the guiding plate, and the feeding sleeve. Inside the feeding cylinder, the spiral blade pushes the dust out to achieve the feeding of the dust. And during the extrusion process, the dust can be made to adhere to each other to avoid scattering, thus not only avoiding many adverse effects on the working environment and the health of the staff, but also facilitating the collection and treatment of the dust. Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the feeding hopper of the present invention; Figure 3 It is a schematic diagram of the structure of the screening roller of the present invention; Figure 4 It is a schematic diagram of the structure of the material guiding seat of the present invention; Figure 5 It is a schematic diagram of the structure of the screening plate of the present invention; Figure 6 It is a schematic diagram of the internal structure of the fixed seat of the present invention; Figure 7 It is a schematic diagram of the internal structure of the conveyor belt of the present invention; Figure 8 It is a schematic diagram of the structure of the scraping plate of the present invention; Figure 9 It is a schematic diagram of the structure of the feeding assembly of the present invention; Figure 10 It is a schematic cross-sectional structure diagram of the support block of the present invention; Figure 11Schematic cross-sectional structure diagram of the transmission belt of the present invention.

[0017] In the figure: 1, support base; 2, support assembly; 21, support block; 22, slider; 23, limiting rod; 24, spring; 3, feeding hopper; 4, conveying assembly; 41, installation mechanism; 411, installation plate; 412, protective plate; 413, bottom plate; 414, fixing plate; 415, material guiding seat; 416, sealing plate; 417, scraping plate; 42, conveying mechanism; 421, transmission belt; 422, screening roller; 423, driving roller; 424, first driven roller; 425, second driven roller; 426, conveyor belt; 427, screening plate; 43, stepping motor; 5, feeding assembly; 51, fixing seat; 52, three-phase asynchronous motor; 53, reducer; 54, eccentric block; 55, feeding cylinder; 56, spiral blade; 57, feeding sleeve; 58, material guiding plate; 59, driving shaft. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 to 11 As shown, the present invention provides an embodiment: a coal conveying device for a power plant, including a support base 1, a support assembly 2 is arranged on the top of the support base 1, a feeding hopper 3 is arranged on the top of the support assembly 2, a conveying assembly 4 and a feeding assembly 5 are arranged inside the support assembly 2, and the conveying assembly 4 includes an installation mechanism 41, a conveying mechanism 42 and a stepping motor 43; The support assembly 2 includes support blocks 21 uniformly and fixedly connected to the support base 1. A slider 22 is slidably connected inside the support block 21. A spring 24 is fixedly connected between the bottom of the slider 22 and the support block 21. The sliders 22 are fixedly connected to the installation plate 411. The installation mechanism 41 includes symmetrically arranged installation plates 411. A material guiding seat 415 is fixedly connected between the two installation plates 411. Sealing plates 416 are symmetrically and fixedly connected to the bottom of the material guiding seat 415. The same bottom plate 413 is fixedly connected to the bottom of the sealing plates 416. The conveying mechanism 42 includes a driving roller 423, a first driven roller 424, and a second driven roller 425 that are sequentially rotatably connected between two mounting plates 411. A conveyor belt 426 is drivingly connected between the driving roller 423 and the first driven roller 424. Symmetrically driving belts 421 are drivingly connected between the driving roller 423 and the second driven roller 425. Screening rollers 422 are uniformly fixedly connected between the two driving belts 421. A screening plate 427 is fixedly connected between the two mounting plates 411; The stepper motor 43 is fixedly installed on the mounting plate 411 and is fixedly connected to the driving roller 423 through a coupling. The hopper 3 is fixedly connected to the support block 21.

[0020] In the actual application of the embodiment of the present invention, such as Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 11 shown, coal falls from the hopper 3 and lands on the conveyor belt 426 of the conveying mechanism 42. The stepper motor 43 is started, and the stepper motor 43 drives the driving roller 423 to rotate. On the one hand, the driving roller 423 drives the first driven roller 424 to rotate through the conveyor belt 426, realizing the conveyance of coal on the conveyor belt 426. On the other hand, the driving roller 423 drives the second driven roller 425 to rotate through the driving belt 421, and then drives the screening roller 422 to rotate; Such as Figures 2 to 4 shown, during the conveying process, smaller coal dust falls through the pores of the screening plate 427 and the gaps between the screening rollers 422, and falls into the material guiding seat 415 of the mounting mechanism 41. Then the coal dust falls onto the bottom plate 413 along the sealing plates 416 symmetrically fixedly connected to the bottom of the material guiding seat 415; Such as Figure 2 and Figure 10 shown, when the coal lands on the conveyor belt 426, due to the buffering effect of the slider 22 slidably connected inside the support block 21 and the spring 24 fixedly connected between the bottom of the slider 22 and the support block 21, the impact of the coal on the driving belt 421 and the screening roller 422 is reduced. In this way, on the one hand, the service life of the driving belt 421 and the screening roller 422 is improved, and on the other hand, the damage rate of the coal is reduced, and the generation of coal dust is reduced; Thus, the entire process realizes the screening of dust during the coal conveying process. The screened dust is convenient for collection and treatment, avoiding the adverse effects of dust on the working environment and the health of the staff.

[0021] Such as Figure 6 and Figure 9As shown, the material discharge component 5 includes a fixed seat 51 fixedly connected to the bottom of the base plate 413 and a three-phase asynchronous motor 52, the fixed seat 51 is fixedly connected to a material discharge barrel 55, the material discharge barrel 55 is rotatably connected to a spiral blade 56, the output end of the three-phase asynchronous motor 52 is fixedly connected to a drive shaft 59 through a coupling, the spiral blade 56 and the drive shaft 59 are connected by a reducer 53, the outer side of the drive shaft 59 is fixedly connected to an eccentric block 54, the fixed seat 51 is symmetrically fixedly connected to a material guide plate 58, a material discharge sleeve 57 is fixedly connected between the two material guide plates 58, and the material discharge sleeve 57 is fixedly connected to the material discharge barrel 55.

[0022] When the embodiment of the present invention is actually applied, the coal dust falling from the conveying mechanism 42 enters the unloading component 5, specifically, the dust falls into the fixed seat 51 fixedly connected to the bottom of the bottom plate 413, and then the dust slides along the guide plate 58 symmetrically fixedly connected inside the fixed seat 51 to the unloading sleeve 57, and then enters the unloading barrel 55 fixedly connected thereto through the unloading sleeve 57; at this time, the three-phase asynchronous motor 52 is started, and the output end of the three-phase asynchronous motor 52 drives the driving shaft 59 to rotate through the coupling, and the driving shaft 59 drives the spiral blades 56 inside the unloading barrel 55 to rotate through the transmission of the reducer 53, and the spiral blades 56 push the dust to move and extrude in the unloading barrel 55 to realize the unloading of the dust, and in this process, the squeezing effect of the spiral blades 56 makes the dust adhere to each other, reducing the scattering of the dust, so as to reduce many adverse effects on the working environment and the health of the staff, and at the same time, it is also convenient for the dust to be collected and processed; and the eccentric block 54 on the outside of the driving shaft 59 will generate certain vibrations during the rotation process, which is conducive to the smooth unloading of the dust.

[0023] like Figure 4 , Figure 6 and Figure 7 As shown, the outer sides of the driving roller 423 and the driven roller 424 are provided with an annular groove with an isosceles trapezoidal cross section, and the screening plate 427 is provided with a material discharge trough at one end close to the conveyor belt 426.

[0024] When the embodiment of the present invention is actually applied, the annular groove with an isosceles trapezoidal cross-section opened on the outer side of the driving roller 423 and the driven roller 424 can better guide and fix the conveyor belt 426, prevent the conveyor belt 426 from deviating or slipping during operation, and ensure that the coal can be stably transported on the conveyor belt 426. At the same time, the discharge chute opened on the screening plate 427 near one end of the conveyor belt 426 can make the screened coal dust fall more smoothly into the collection device below, avoid dust accumulation at the screening plate 427, and ensure the continuous and efficient screening process.

[0025] like Figure 4 , Figure 7 , Figure 8 andFigure 11 As shown in the figure, the installation mechanism 41 further includes a fixing plate 414 and a scraping plate 417 symmetrically and fixedly connected to the outer side wall of the material guiding seat 415. An arc-shaped groove adapted to the driving roller 423 is formed at one end of the scraping plate 417 away from the fixing plate 414. Both the fixing plate 414 and the scraping plate 417 are fixedly connected to the bottom plate 413. Square grooves adapted to the transmission belt 421 are formed at the bottoms of the fixing plate 414 and the scraping plate 417, and the transmission belt 421 is slidably connected in the square grooves.

[0026] In the actual application of the embodiment of the present invention, the arc-shaped groove formed at one end of the scraping plate 417 away from the fixing plate 414 and adapted to the driving roller 423 can closely fit the driving roller 423. During the operation of the equipment, it can prevent coal or dust from accumulating near the driving roller 423 and ensure the smooth progress of the conveying process; the square grooves formed at the bottoms of the fixing plate 414 and the scraping plate 417 and adapted to the transmission belt 421 enable the transmission belt 421 to slide in the square grooves, which not only ensures the normal running track of the transmission belt 421 but also prevents the transmission belt 421 from shifting or jumping during operation, improving the running stability and reliability of the conveying mechanism 42; In addition, through the fixing plate 414, the scraping plate 417 and the mounting plate 411, a relatively closed space can be jointly formed, effectively preventing the random inflow of external air and the overflow of internal dust.

[0027] As Figure 3 and Figure 5 shown in the figure, protective plates 412 are fixedly connected to the tops of the mounting plates 411, and the protective plates 412 are in mutual contact with the transmission belt 421.

[0028] In the actual application of the embodiment of the present invention, the mutual contact between the protective plate 412 and the transmission belt 421 can effectively prevent coal from accidentally falling from both sides of the transmission belt 421 during the conveying process. At the same time, when the transmission belt 421 rotates at a high speed, the protective plate 412 can block external sundries from entering the area of the transmission belt 421, avoiding damage to the transmission system, further enhancing the sealing performance and environmental protection of the entire coal conveying device during operation, and ensuring that coal can be stably and efficiently conveyed to the designated position.

[0029] As Figure 10 shown in the figure, a limiting rod 23 is fixedly connected inside the support block 21, and the slider 22 is slidably connected to the outside of the limiting rod 23.

[0030] In practical applications of the embodiments of the present invention, the slider 22 is slidably connected to the outside of the limiting rod 23, so that the slider 22 can always remain on a stable track during the up-and-down movement for buffering, thereby preventing the slider 22 from shifting or wobbling when displaced by the impact of coal, ensuring that the spring 24 can uniformly exert a buffering effect, and guaranteeing the stability of the entire support assembly 2.

[0031] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal conveying device for a power plant, comprising a support base (1), characterized in that: A support assembly (2) is arranged on the top of the support seat (1), a material discharge hopper (3) is arranged on the top of the support assembly (2), a conveying assembly (4) and a material discharge assembly (5) are arranged inside the support assembly (2), and the conveying assembly (4) comprises a mounting mechanism (41), a conveying mechanism (42) and a stepping motor (43); The support assembly (2) comprises a support block (21) uniformly fixedly connected to the support seat (1); a slider (22) is slidably connected inside the support block (21); a spring (24) is fixedly connected between the bottom of the slider (22) and the support block (21); and the sliders (22) are fixedly connected to the mounting plate (411); The mounting mechanism (41) comprises symmetrically arranged mounting plates (411), a material guide seat (415) being fixedly connected between the two mounting plates (411), a sealing plate (416) being symmetrically fixedly connected to the bottom of the material guide seat (415), and a bottom of the sealing plate (416) being fixedly connected to the same bottom plate (413); The conveying mechanism (42) comprises a driving roller (423), a driven roller 1 (424) and a driven roller 2 (425) which are sequentially rotatably connected between two mounting plates (411); a conveying belt (426) is transmission-connected between the driving roller (423) and the driven roller 1 (424); a transmission belt (421) is symmetrically transmission-connected between the driving roller (423) and the driven roller 2 (425); a screening roller (422) is evenly fixedly connected between the two transmission belts (421); and a screening plate (427) is fixedly connected between the two mounting plates (411); The stepper motor (43) is fixedly mounted on the mounting plate (411) and is fixedly connected to the driving roller (423) via a coupling, and the lower hopper (3) is fixedly connected to the support block (21).

2. A coal conveying device for a power plant according to claim 1, characterized in that: The material discharge assembly (5) comprises a fixed seat (51) fixedly connected to the bottom of the base plate (413) and a three-phase asynchronous motor (52); a material discharge barrel (55) is fixedly connected inside the fixed seat (51); a spiral blade (56) is rotatably connected inside the material discharge barrel (55); an output end of the three-phase asynchronous motor (52) is fixedly connected to a drive shaft (59) via a coupling; the spiral blade (56) and the drive shaft (59) are transmission-connected via a reducer (53); and an eccentric block (54) is fixedly connected to the outside of the drive shaft (59).

3. A coal conveying device for a power plant according to claim 2, characterized in that: The outer sides of the driving roller (423) and the driven roller (424) are both provided with an annular groove with an isosceles trapezoidal cross section, and the screening plate (427) is provided with a material discharge groove at one end close to the conveyor belt (426).

4. A coal conveying device for a power plant according to claim 2, characterized in that: The mounting mechanism (41) further comprises a fixed plate (414) and a scraper plate (417) symmetrically fixedly connected to the outer wall of the material guide seat (415); an arc-shaped groove matching the driving roller (423) is formed at one end of the scraper plate (417) away from the fixed plate (414); and the fixed plate (414) and the scraper plate (417) are both fixedly connected to the bottom plate (413).

5. A coal conveying device for a power plant according to claim 2, characterized in that: The top of each of the mounting plates (411) is fixedly connected with a protective plate (412), and the protective plate (412) and the transmission belt (421) are in contact with each other.

6. A coal conveying device for a power plant according to claim 2, characterized in that: A material guide plate (58) is symmetrically fixedly connected inside the fixed seat (51), a material discharge sleeve (57) is fixedly connected between the two material guide plates (58), and the material discharge sleeve (57) is fixedly connected to the material discharge barrel (55).

7. A coal conveying device for a power plant according to claim 3, characterized in that: The interior of the support block (21) is fixedly connected to a limiting rod (23), and the sliding block (22) is slidably connected to the outside of the limiting rod (23).

8. A coal conveying device for a power plant according to claim 4, characterized in that: The bottoms of the fixing plate (414) and the scraping plate (417) are both provided with square grooves adapted to the transmission belt (421), and the transmission belt (421) is slidably connected in the square grooves.

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