Impact carrier roller structure of power plant fire coal conveyor

Abstract

The invention relates to the technical field of belt conveyors, in particular to a power plant fire coal conveyor impact idler structure which comprises a belt conveyor, a plurality of carrier rollers, auxiliary carrier roller sets, pressurizing sets and spraying sets, the auxiliary carrier roller sets are installed on a rack and located on the two sides of the carrier rollers below a discharging opening, the pressurizing sets are symmetrically installed on the two sides of the rack, and the spraying sets are symmetrically installed on the two sides of the rack. The device is installed on the water tank. The auxiliary carrier roller set converts impact force generated when coal briquettes fall into continuous slow pressurization in the water tank through cooperation of the pressurization set, finally the coal briquettes are atomized and sprayed out through the spraying set, meanwhile, a push rod, a rack and a gear in the spraying set are matched with one another, an atomization spray head rotates or swings, the spraying range is enlarged, secondary utilization of energy is achieved through the structure, and energy is saved. Original useless impact energy is converted into power needed by dust falling, the green and energy-saving concept is met, the energy consumption cost of operation of a power plant is reduced, and the comprehensive utilization rate of resources is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of belt conveyors, and specifically to a buffer idler structure for a coal conveyor in a power plant. Background Art

[0002] The coal conveyor in a power plant is a special belt conveyor used to transport coal in a thermal power plant, mainly responsible for the coal transportation task from the coal storage yard (or coal unloading device) to the raw coal bunker of the boiler, and is one of the core equipment in the fuel supply system of the power plant.

[0003] Since the belt conveyor used to transport coal to the boiler is usually docked with another belt conveyor for coal washing or preliminary crushing (or directly with the discharge port), there is often a certain height difference between the two groups of belt conveyors. Due to the different structures of each boiler house, the height differences are also different. Generally, in the case of a large height difference, multiple groups of buffer idlers are added to the coal-transporting belt conveyor to reduce the damage to the conveyor belt caused by the falling coal blocks and to maintain the conveying stability.

[0004] The buffer idler relies on a buffer ring sleeved on the idler. The buffering performance of the buffer ring is insufficient and can only be applied to places where the size and weight of the coal blocks are relatively uniform. In order to increase better applicability, a spring damper is generally added under the buffer idler. Although better applicability is achieved, the impact force generated by the falling coal blocks cannot be effectively utilized. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a buffer idler structure for a coal conveyor in a power plant, solving the problems raised in the above background art.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention provides a buffer idler structure for a coal conveyor in a power plant, including a belt conveyor and a plurality of idlers. The belt conveyor includes a frame, a belt, and a power driving structure, and is characterized in that:

[0009] Auxiliary idler groups are installed on both sides of the idlers located below the discharge port. Each auxiliary idler group includes a buffer plate, an auxiliary idler installed on the buffer plate, a support plate fixed to the frame, a pressure rod, a pressure block, and a spring. The pressure rod is hinged between the buffer plate and the pressure block. The spring is installed between the pressure block and the frame. The pressure block is slidably connected to the support plate;

[0010] The pressurizing group includes a support frame, a fixing plate, an air storage barrel, a piston rod, and a water tank. The support frame is fixed to the machine frame, and the water tank is installed thereon. The fixing plate is installed on the support frame and fixed to the air storage barrel. The tail end of the piston rod penetrates the machine frame and is fixed to the pressing block. The pressing block can push to perform a piston movement within the air storage barrel. The air storage barrel is communicated with the water tank through an air pipe. An intake check valve is installed on the air storage barrel, and an exhaust check valve is installed at the outlet end of the air pipe.

[0011] The atomizing nozzle is rotatably connected to the water tank. The water tank is communicated with the atomizing nozzle through a connecting hose. A gear is provided outside the atomizing nozzle. The piston rods are fixed by a limiting plate to move synchronously. A rack for driving the gear to rotate is fixed on the limiting plate.

[0012] Further, a rubber gasket is fixed on the side of the limiting plate facing the machine frame. The thickness of the rubber gasket is about 2 - 3 cm and completely covers the side of the limiting plate facing the machine frame.

[0013] Further, a guiding plate is provided between the two pressing rods of the buffer plate. The guiding plate penetrates the supporting plate and is slidably connected to the supporting plate. After the guiding plate is completely pressed down, it does not abut against the belt at the bottom.

[0014] Further, limiting pieces are fixed on both sides of the guiding plate. When the buffer plate is in a natural state, the height between the limiting pieces and the supporting plate is greater than 3 cm.

[0015] Further, a sliding step is formed by downward depression on the supporting plate. Rollers are provided on both sides of the pressing block at the step. The rollers can roll on the sliding step.

[0016] Further, the two inner sides of the supporting plate at the sliding step are inclined outward so that the rollers do not contact the inner side wall of the supporting plate when rolling on the sliding step.

[0017] Further, the angle at which the rack pushes the gear to rotate back and forth is less than 180°. The atomizing nozzle faces the discharge port in a natural state.

[0018] Further, the racks at the bottoms of the two atomizing nozzles are arranged oppositely, and the directions in which the racks push the gears to drive the atomizing nozzles to rotate are opposite.

[0019] Further, the piston rod slides in the middle of the spring, and the piston rod restricts the spring from popping out under force between the pressing block and the machine frame.

[0020] Furthermore, a clamping plate is provided at the bottom of the fixing plate. Semi-circular grooves adapted to each other are formed on both the fixing plate and the clamping plate. The clamping plate is bolted and fixed to the fixing plate. The clamping plate and the fixing plate clamp and restrict the air storage barrel through the two semi-circular grooves.

[0021] Furthermore, plastic gaskets are fixed on the surfaces of the semi-circular grooves of the clamping plate and the fixing plate that are adapted to contact the air storage barrel.

[0022] Furthermore, a counterweight ball is fixed at the bottom of the connecting hose. Affected by the counterweight ball, the hose naturally droops to the bottom of the water tank, and the water in the water tank can enter the hose along the counterweight ball.

[0023] Furthermore, a rotating pipe is fixed on the water tank, and the atomizing nozzle is rotatably connected to the rotating pipe.

[0024] Furthermore, a push rod is bolted and fixed on the limiting piece. The push rod is fixed to the gear and is slidably connected to the frame.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the present invention provides a buffer idler structure for a coal conveyor in a power plant, and has the following beneficial effects:

[0027] 1. In the present invention, the impact force when the coal blocks fall is transmitted through the auxiliary idler group, and through the cooperation of the pressurization group, it is converted into continuous slow pressurization of the water tank, and finally atomized and sprayed by the spraying group. At the same time, the push rod, rack and gear in the spraying group cooperate with each other to make the atomizing nozzle rotate or swing, increasing the spraying range. This structure realizes the secondary utilization of energy, converts the originally useless impact energy into the power required for dust reduction, conforms to the concept of green energy conservation, helps to reduce the energy consumption cost of power plant operation, improves the comprehensive utilization rate of resources, and solves the problem that the impact force generated by the falling of coal blocks in the prior art cannot be effectively utilized;

[0028] 2. In the present invention, a sliding step is formed by recessing downward on the support plate. The pressing blocks are provided with rollers on both sides of the step, and the rollers can roll on the sliding step. When the buffer plate moves downward under impact, the pressing rod pushes the pressing blocks to roll rather than slide on the step, using the rolling friction characteristics of the rollers to reduce mechanical resistance, and at the same time avoiding the pressing blocks from getting stuck and preventing the buffer idler from malfunctioning;

[0029] 3. In the present invention, the clamping plate is bolted and fixed to the fixing plate. The clamping plate and the fixing plate clamp and restrict the air storage barrel through the two semi-circular grooves. The air storage barrel can pre-complete the pipeline connection outside the clamping groove, and then be quickly fixed through the bolt connection of the clamping plate and the fixing plate, saving installation time and reducing maintenance difficulty. Description of the drawings

[0030] Figure 1Schematic diagram of the three-dimensional structure of the present invention;

[0031] Figure 2 Shows Figure 1 Partial structure diagram of the part located below the discharge port in;

[0032] Figure 3 Shows Figure 2 Bottom view structure diagram of;

[0033] Figure 4 Shows the structure diagram of the auxiliary supporting roller group;

[0034] Figure 5 Shows the structure diagram of the pressurizing group and the spraying group;

[0035] Figure 6 Shows Figure 5 Structure diagram after removing the water tank;

[0036] Figure 7 Shows Figure 5 Sectional structure diagram of;

[0037] Figure 8 Shows the structure diagram after the separation of the clamping plate and the fixing plate.

[0038] In the figure: 1, belt conveyor; 101, frame; 102, belt; 103, power drive structure; 2, supporting roller; 3, auxiliary supporting roller group; 301, auxiliary roller; 302, buffer plate; 303, pressing rod; 304, pressing block; 305, supporting plate; 306, spring; 4, intake one-way valve; 5, pressurizing group; 501, support frame; 502, fixing plate; 503, air storage barrel; 504, piston rod; 505, water tank; 6, exhaust one-way valve; 7, atomizing nozzle; 8, connecting hose; 9, gear; 10, limiting plate; 11, rack; 12, rubber gasket; 13, guiding plate; 14, limiting piece; 15, sliding step; 16, roller; 17, clamping plate; 18, semi-circular groove; 19, plastic gasket; 20, counterweight ball; 21, rotating pipe; 22, push rod; 23, air pipe. Detailed implementation manners

[0039] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment: Please refer to Figures 1 to 8, according to an embodiment of the present invention, a technical solution is provided: a buffer idler structure for a coal conveyor in a power plant, including a belt conveyor 1 and a plurality of idlers 2. The belt conveyor 1 includes a frame 101, a belt 102, and a power drive structure 103. It is characterized in that:

[0041] Two groups of auxiliary idlers, installed on both sides of the idler 2 below the discharge port. Each group of auxiliary idlers includes a buffer plate 302, an auxiliary roller 301 installed on the buffer plate 302, a support plate 305 fixed to the frame 101, a pressure rod 303, a pressure block 304, and a spring 306. The pressure rod 303 is hinged between the buffer plate 302 and the pressure block 304. The spring 306 is installed between the pressure block 304 and the frame 101. The pressure block 304 is slidably connected to the support plate 305;

[0042] A pressurization group 5, which includes a support frame 501, a fixing plate 502, an air storage tank 503, a piston rod 504, and a water tank 505. The support frame 501 is fixed to the frame 101, and a water tank 505 is installed thereon. The fixing plate 502 is installed on the support frame 501 and fixed to the air storage tank 503. The tail end of the piston rod 504 penetrates the frame 101 and is fixed to the pressure block 304. The pressure block 304 can push to perform a piston movement in the air storage tank 503. The air storage tank 503 is connected to the water tank 505 through an air pipe 23. An intake check valve 4 is installed on the air storage tank 503, and an exhaust check valve 6 is installed at the outlet end of the air pipe 23;

[0043] An atomizing nozzle 7, which is rotatably connected to the water tank 505. The water tank 505 is connected to the atomizing nozzle 7 through a connecting hose 8. A gear 9 is provided outside the atomizing nozzle 7. The piston rods 504 are fixed by a limiting plate 10 to perform synchronous movement. A rack 11 for driving the gear 9 to rotate is fixed on the limiting plate 10.

[0044] According to the above embodiment, briefly describe its working principle:

[0045] Reference can be made to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 7 , first is the buffering process. When coal blocks fall from the upstream conveyor or the discharge port onto the belt 102, they first impact the two groups of auxiliary idlers on both sides of the idler 2 below the discharge port. Since the auxiliary roller 301 is slightly higher than the idler 2, it will contact the coal blocks first. The impact force of the coal blocks causes the auxiliary roller 301 to drive the buffer plate 302 to move downward;

[0046] The buffer plate 302 pushes the pressure block 304 to slide in the chute of the support plate 305 through the pressure rod 303, compressing the spring 306. The elastic deformation of the spring 306 absorbs part of the impact force of the falling coal blocks, playing a preliminary buffering role and reducing the direct impact of the coal blocks on the main idler 2 and the belt 102.

[0047] For reference Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 7 , and secondly, in the energy recovery and gas compression process, during the buffering process of the two groups of auxiliary supporting rollers, the downward movement of the pressure rod 303 will drive the piston rod 504 fixed to the pressing block 304 to slide in the air storage barrel 503, compress the air in the air storage barrel 503. The intake one-way valve 4 on the side wall of the air storage barrel 503 ensures that air can only enter the air storage barrel 503 unidirectionally, preventing the compressed air from flowing back. The compressed air is transported to the water tank 505 through the air pipe 23, and an exhaust one-way valve 6 is provided to ensure that the compressed air will not flow back into the air storage barrel 503, which is used to pressurize the water tank 505. During this process, the piston rod 504 slides back and forth in the air storage barrel 503. The process of pressurizing the water tank 505 will consume the elastic potential energy of the spring 306, which is similar to the principle of a damper, except that the way of converting the kinetic energy of the damper into heat energy is changed to converting the kinetic energy into pressurizing the inside of the water tank 505 until spraying.

[0048] For reference Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 7 , and finally, in the spraying process, when the piston rod 504 drives the limiting plate 10 to move during the compression of the compressed air, the rack 11 fixed to the limiting plate 10 will move accordingly. The movement of the rack 11 drives the meshing gear 9 to rotate. During this process, only part of the rack 11 meshes with the gear 9, and the rest is slidably connected to the fixing plate 502, thereby driving the atomizing nozzle 7 to rotate around the rotating pipe 21. At the same time, as the atomizing nozzle 7 rotates, due to the increase in pressure in the water tank 505, water is sprayed out along the atomizing nozzle 7 in an atomized form through the connecting hose 8, realizing the spraying and dust reduction of the coal blocks on the conveyor belt.

[0049] It should be noted that during the initial transportation of coal blocks, the spraying effect will not be carried out. In a short time, the pressure in the water tank 505 is insufficient and it takes a certain time to wait. Secondly, attention should be paid to the pressure in the water tank 505 during the water replenishment process of the water tank 505. When implementing the above scheme, structures such as a pressure gauge and a pressure relief valve can be installed on the water tank 505. Of course, in the case of not installing, after the water in the water tank 505 is sprayed out, there is no pressure inside and it is in a balanced state;

[0050] If it is necessary to further increase the stability of the two sets of auxiliary supporting rollers 2, a guiding plate 13 or a guiding rod can be arranged at the bottom of the buffer plate 302 to limit the swaying range of the two sets of auxiliary supporting rollers 2. Of course, guiding rods or guiding plates 13 can also be arranged on both sides of the buffer plate 302, as long as the swaying range of the two sets of auxiliary supporting rollers 2 is reduced. Or, the pressing block 304 can be embedded and slide in the supporting plate 305, and increasing the volume of the pressing block 304 can also effectively reduce the swaying range.

[0051] Adopting the above-mentioned structure of the buffer supporting roller 2 of the coal conveyor, when the coal blocks fall, the impact force is continuously converted into slow pressurization in the water tank 505 through the cooperation of the pressurization group 5, and finally atomized and sprayed out by the spraying group. At the same time, the push rod 22, the rack 11 and the gear 9 in the spraying group cooperate with each other to make the atomizing nozzle 7 rotate or swing, increasing the spraying range. This structure realizes the secondary utilization of energy, converts the originally useless impact energy into the power required for dust reduction, conforms to the concept of green energy conservation, helps to reduce the energy consumption cost of the power plant operation, improves the comprehensive utilization rate of resources, and solves the problem that the impact force generated by the falling of coal blocks in the existing technology cannot be effectively utilized.

[0052] For reference Figure 6 , a rubber gasket 12 is fixed on the side of the limiting plate 10 facing the frame 101. The thickness of the rubber gasket 12 is about 2 - 3 cm and completely covers the side of the limiting plate 10 facing the frame 101. Collisions between rigid components will generate relatively large noises, and the buffering effect of the rubber gasket 12 can play a certain role in weakening, which helps to further improve the overall working environment, reduce the hearing burden of the staff in a long-term noisy environment, and also better meets the environmental protection requirements for noise control in industrial production.

[0053] For reference Figure 2 And Figure 4 , a guiding plate 13 is arranged between the two pressure rods 303 of the buffer plate 302. The guiding plate 13 penetrates through the supporting plate 305 and is slidably connected with the supporting plate 305. After the guiding plate 13 is completely pressed down, it does not abut against the bottom belt 102, preventing the buffer plate 302 from swaying horizontally or tilting due to uneven force during the impact or reset of the coal blocks, ensuring that the auxiliary roller 301 always maintains a perpendicular force state with the belt 102, improving the supporting stability of the two sets of buffer supporting rollers 2 for the belt 102, and making the two side pressure rods 303 more coordinated through guiding constraints.

[0054] For reference Figure 6, in this embodiment, limit pieces 14 are fixed on both sides of the guide plate 13. In the natural state of the buffer plate 302, the height between the limit piece 14 and the support plate 305 is greater than 3 cm. The relatively large height difference provides a relatively sufficient downward buffer stroke for the buffer plate 302, enhancing the ability of the two sets of buffer rollers 2 to cope with the impact of large-weight and high-drop coal blocks, and avoiding the impact force directly acting on the belt 102 and the rollers 2 due to insufficient buffer stroke.

[0055] for reference Figure 4 , since the original guiding function of the pressing block 304 is covered by the guide plate 13 and it no longer needs to perform the guiding function, a sliding step 15 is formed by recessing downward on the support plate 305. The pressing block 304 is provided with rollers 16 on both sides of the step. The rollers 16 can roll on the sliding step 15. When the buffer plate 302 moves downward under impact, the pressing rod 303 pushes the pressing block 304 to roll rather than slide on the step, using the rolling friction characteristics of the rollers 16 to reduce mechanical resistance, and at the same time avoiding the pressing block 304 from getting stuck and preventing the buffer roller 2 from not working.

[0056] for reference Figure 4 , the two inner sides of the support plate 305 where the sliding step 15 is located are inclined outward, so that the rollers 16 do not contact the inner side wall of the support plate 305 when rolling on the sliding step 15. Compared with the vertical side wall structure, the rolling resistance can be reduced by about 15% - 20%, making the response of the pressing block 304 to the impact of coal blocks more sensitive and the energy transfer efficiency higher. Secondly, it is to prevent foreign matters such as coal dust and crushed coal particles from accumulating between the rollers 16 and the side wall, avoiding the movement stagnation of the pressing block 304 caused by foreign matter jamming.

[0057] for reference Figure 5 and Figure 7 , in this embodiment, to make the atomizing nozzle 7 only swing back and forth instead of rotating, resulting in excessive waste of water resources, it is necessary to make the angle of the rack 11 pushing the gear 9 rotate back and forth less than °, and it is necessary to make the atomizing nozzle 7 face the discharge port in the natural state. Secondly, the racks 11 at the bottoms of the two atomizing nozzles 7 are arranged oppositely, and the directions of the rack 11 pushing the gear 9 to drive the atomizing nozzle 7 to rotate are opposite, ensuring that the atomizing nozzle 7 swings back and forth in the coal block falling area (near the discharge port), avoiding excessive rotation of the nozzle resulting in water resource waste or spraying blind spots, and enabling atomizing spraying immediately when the coal block just falls, maximizing the suppression of dust raising and improving the dust reduction efficiency.

[0058] The piston rod 504 slides in the middle of the spring 306. The piston rod 504 restricts the spring 306 from being forced to pop out between the pressing block 304 and the frame 101. When the spring 306 is stressed alone, it may bend due to excessive compression (especially for the long spring 306). As a central guide rod, the piston rod 504 provides axial support for the spring 306, avoiding the instability of the spring 306.

[0059] At the bottom of the fixing plate 502, there is a clamping plate 17. Semi-circular grooves 18 which are adapted to each other are formed on both the fixing plate 502 and the clamping plate 17. The clamping plate 17 is bolted and fixed to the fixing plate 502. The clamping plate 17 and the fixing plate 502 clamp and restrict the air storage barrel 503 through the two semi-circular grooves 18. The air storage barrel 503 can complete the pipeline connection (such as the intake check valve 4 and the air pipe 23) outside the clamping groove in advance, and then be quickly fixed through the bolt connection between the clamping plate 17 and the fixing plate 502. Compared with the traditional welding or all-inclusive fixing, it saves more than 50% of the installation time. When the air storage barrel 503 needs to be repaired or replaced, only need to loosen the bolts and remove the clamping plate 17, then the air storage barrel 503 can be taken out from the clamping groove, without disassembling the whole support frame 501 or the pipeline system, greatly reducing the maintenance complexity.

[0060] On the surfaces of the semi-circular grooves 18 of the clamping plate 17 and the fixing plate 502 which are adapted to contact the air storage barrel 503, there are plastic gaskets 19 fixed, reducing the rigid collision between metal parts, but it is necessary to avoid too large vibration amplitude, otherwise the sealing performance between the air storage barrel 503 and the piston will decrease.

[0061] At the bottom of the connecting hose 8, there is a counterweight ball 20 fixed. Affected by the counterweight ball 20, the hose naturally droops to the bottom of the water tank 505. The water in the water tank 505 can enter the hose along the counterweight ball 20. Using the self-weight of the counterweight ball 20, the hose is vertically drooped to the bottom of the water tank 505, ensuring that the hose is always under the water and avoiding the pipe orifice detaching from the water surface due to buoyancy.

[0062] On the water tank 505, there is a rotating pipe 21 fixed. The atomizing nozzle 7 is rotatably connected to the rotating pipe 21. By setting the rotating pipe 21 on the water tank 505 and making the atomizing nozzle 7 rotatably connected to the rotating pipe 21 instead of directly rotating with the water tank 505, it avoids the water leakage of the water tank 505 caused by long-term rotation and increases the service life.

[0063] On the limiting piece 14, there is a push rod 22 bolted and fixed. The push rod 22 is fixed to the gear 9. The push rod 22 is slidably connected to the frame 101. By setting the push rod 22, it is more convenient to replace the rack 11 and the gear 9.

[0064] 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 spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Structure of buffer idler for coal conveyor in power plant, comprising a belt conveyor (1) and a plurality of idlers (2), wherein the belt conveyor (1) includes a frame (101), a belt (102) and a power driving structure (103), and is characterized in that: A group of auxiliary idlers (2) is installed on both sides of the idlers (2) located below the discharge port. The group of auxiliary idlers (2) includes buffer plates (302), auxiliary rollers (301) installed on the buffer plates (302), support plates (305) fixed to the frame (101), pressure rods (303), pressure blocks (304) and springs (306). The pressure rods (303) are hinged between the buffer plates (302) and the pressure blocks (304). The springs (306) are installed between the pressure blocks (304) and the frame (101). The pressure blocks (304) are slidably connected to the support plates (305); A pressurization group (5), which includes a support frame (501), a fixing plate (502), an air storage barrel (503), a piston rod (504) and a water tank (505). The support frame (501) is fixed to the frame (101), on which the water tank (505) is installed. The fixing plate (502) is installed on the support frame (501) and fixed to the air storage barrel (503). The tail end of the piston rod (504) penetrates the frame (101) and is fixed to the pressure block (304). The pressure block (304) can push to perform piston movement in the air storage barrel (503). The air storage barrel (503) is communicated with the water tank (505) through an air pipe (23). An intake one-way valve (4) is installed on the air storage barrel (503). An exhaust one-way valve (6) is installed at the outlet end of the air pipe (23); An atomizing nozzle (7), which is rotatably connected to the water tank (505). The water tank (505) is communicated with the atomizing nozzle (7) through a connecting hose (8). A gear (9) is arranged outside the atomizing nozzle (7). The piston rods (504) are fixed through a limiting plate (10) to move synchronously. A rack (11) for driving the gear (9) to rotate is fixed on the limiting plate (10).

2. The buffer idler structure of the coal conveyor in a power plant according to claim 1, characterized in that: A rubber gasket (12) is fixed on one side of the limiting plate (10) facing the frame (101). The thickness of the rubber gasket (12) is about 2 - 3 cm and completely covers one side of the limiting plate (10) facing the frame (101).

3. The buffer idler structure of the coal conveyor in a power plant according to claim 1, characterized in that: A guide plate (13) is arranged between the two pressure rods (303) on the buffer plate (302). The guide plate (13) penetrates the support plate (305) and is slidably connected to the support plate (305). When the guide plate (13) is completely pressed down, it does not abut against the bottom belt (102).

4. The buffer idler structure of the coal conveyor in a power plant according to claim 3, characterized in that: Limit pieces (14) are fixed on both sides of the guide plate (13). When the buffer plate (302) is in a natural state, the height between the limit pieces (14) and the support plate (305) is greater than 3 cm.

5. The buffer idler structure of the coal conveyor in a power plant according to claim 3, characterized in that: A sliding step (15) is formed by downward depression on the support plate (305). Rollers (16) are provided on both sides of the step, and the rollers (16) can roll on the sliding step (15).

6. The buffer idler structure of the coal conveyor in a power plant according to claim 5, characterized in that: The two inner sides of the support plate (305) where the sliding step (15) is located are inclined outward, so that when the rollers (16) roll on the sliding step (15), they do not contact the inner side wall of the support plate (305).

7. The buffer idler structure of the coal conveyor in a power plant according to claim 1, characterized in that: The angle by which the rack (11) pushes the gear (9) to rotate back and forth is less than 180°, and the atomizing nozzle (7) faces the discharge port in its natural state.

8. The buffer idler structure of the coal conveyor in a power plant according to claim 7, characterized in that: The racks (11) at the bottoms of the two atomizing nozzles (7) are arranged oppositely, and the directions in which the racks (11) push the gear (9) to drive the atomizing nozzles (7) to rotate are opposite.

9. The buffer idler structure of the coal conveyor in a power plant according to claim 1, characterized in that: The piston rod (504) slides in the middle of the spring (306), and the piston rod (504) restricts the spring (306) from being forced to pop out between the pressing block (304) and the frame (101).

10. The buffer idler structure of the coal conveyor in a power plant according to claim 1, characterized in that: A clamping plate (17) is provided at the bottom of the fixing plate (502). Semi-circular grooves (18) adapted to each other are formed on both the fixing plate (502) and the clamping plate (17). The clamping plate (17) is bolted and fixed to the fixing plate (502), and the air storage tank (503) is clamped and restricted by the two semi-circular grooves (18) of the clamping plate (17) and the fixing plate (502).

11. The buffer idler structure of the coal conveyor in a power plant according to claim 10, wherein: Plastic gaskets (19) are fixed on the surfaces of the semi-circular grooves (18) of the clamping plate (17) and the fixing plate (502) that are adapted to contact the air storage tank (503).

12. The buffer idler structure of the coal conveyor in a power plant according to claim 1, characterized in that: A counterweight ball (20) is fixed at the bottom of the connecting hose (8). Affected by the counterweight ball (20), the hose naturally hangs down to the bottom of the water tank (505), and the water in the water tank (505) can enter the connecting hose (8) along the counterweight ball (20).

13. The buffer idler structure of the coal conveyor in a power plant according to claim 1, characterized in that: A rotating pipe (21) is fixed on the water tank (505), and the atomizing nozzle (7) is rotatably connected to the rotating pipe (21).

14. The buffer idler structure of the coal conveyor in a power plant according to claim 1, wherein: A push rod (22) is bolted and fixed to the limiting piece (14). The push rod (22) is fixed to the gear (9), and the push rod (22) is slidably connected to the frame (101).

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