Coal mill feeding device and feeding system

Abstract

The present invention discloses a coal mill feeding device and feeding system, comprising a feed hopper, wherein the discharge end of the feed hopper is connected to a purge mechanism, a clamp is fixedly installed at the connection between the feed hopper and the purge mechanism, and the discharge end of the purge mechanism is connected to a coal mill cylinder; a feed pipe is provided at one end of the coal mill cylinder, and a discharge pipe is provided at the other end of the coal mill cylinder; a bracket is rotatably connected to the feed pipe and the discharge pipe, a bearing is sleeved on the surface of the feed pipe, and a sealing filler is provided on the feed end of the feed pipe, and the sealing filler seals the end face of the feed pipe and the bearing. The technical problem to be solved by the present invention is that the existing coal mill feeding device is not convenient for using air to purge the coal slurry at the connection between the feed end of the coal mill and the sealing filler during use, which easily causes the coal slurry to leak from the sealing filler, causing coal mill operation failure and increasing maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding equipment, in particular to a coal mill feeding device and a feeding system. Background Art

[0002] A coal mill is a type of grinding equipment used to crush and grind coal into pulverized coal. It is widely used in the power, metallurgy, and building materials industries. It is particularly important in industrial boilers and power plants because the pulverized coal burns more completely and efficiently, helping to improve energy efficiency and reduce environmental pollution. A wet overflow rod mill is a type of coal mill. A wet overflow rod mill operates by rotating the cylinder through a motor, causing the steel rods contained within the cylinder to rise to a certain height and then fall freely. The impact and friction between the rods crush and grind the material, gradually grinding it into fine powder within the cylinder and discharging it, along with the slurry, from an overflow port at one or both ends.

[0003] During the use of the wet overflow rod mill, sealing packing is provided at the feed end of the coal mill inlet and the bearing end face. The main material of the sealing packing is oil-impregnated asbestos pad packing. The operating cycle of the sealing packing is short, and the slurry leakage at the packing is serious. The accumulated and leaked coal slurry enters the gap between the large and small gears of the coal mill through the large gear ring of the coal mill. The lubricating grease between the large and small gears is contaminated and the oil film is destroyed. When the oil film is severely damaged, the large and small gears of the coal mill are not engaged well, the main motor and reducer of the coal mill vibrate excessively, the clutch hub bolts break, and the mixed coal slurry may also cause a fire. After the new packing is replaced at the inlet end face of the coal mill and put into use, the operating cycle is short, and there will be different degrees of slurry leakage at the packing. Moreover, since the coal mill is a rotating equipment, the coal mill must be stopped when cleaning the leaked coal slurry. The operation time is long, and the number of starts and stops of the coal mill increases, which increases the failure rate of the equipment.

[0004] During use, the existing coal mill feeding device is not convenient for using air to purge the coal slurry at the connection between the coal mill feed end and the sealing filler, which easily causes the coal slurry to leak from the sealing filler, causing coal mill operation failure and increasing maintenance costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that during the use of the existing coal mill feeding device, it is inconvenient to use air to blow the coal slurry at the connection between the coal mill feed end and the sealing filler, which easily causes the coal slurry to leak from the sealing filler, causing coal mill operation failure and increasing maintenance costs.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a coal mill feeding device, comprising a feed hopper, a discharge end of the feed hopper being connected to a purge mechanism, a clamp being fixedly installed at the connection between the feed hopper and the purge mechanism, and a discharge end of the purge mechanism being connected to a coal mill cylinder;

[0007] A feed pipe is provided at one end of the coal grinding cylinder, and a discharge pipe is provided at the other end of the coal grinding cylinder. A bracket is rotatably connected to the feed pipe and the discharge pipe. A bearing is sleeved on the surface of the feed pipe. A sealing filler is provided on the feed end of the feed pipe. The sealing filler seals the end surface of the feed pipe and the bearing. The purge mechanism blows annular air toward the inner wall of the sealing filler to clean the coal slurry and prevent coal slurry leakage.

[0008] As a preferred solution of the coal mill feeding device of the present invention, the bottom of the bracket is fixedly connected to a base, the surface of the coal mill cylinder is equipped with a drive assembly, and the drive assembly is fixedly installed on the top of the base.

[0009] As a preferred solution of the coal mill feeding device of the present invention, the discharge end of the discharge pipe is connected to a drum screen.

[0010] As a preferred solution of the coal mill feeding device of the present invention, the purge mechanism includes a shell, the feed end of the shell is fixedly connected to the discharge end of the feed hopper, and the discharge end of the shell is fixedly mounted on the bracket and communicated with the feed end of the feed pipe.

[0011] As a preferred solution of the coal mill feeding device of the present invention, a protective cover and an annular tube are fixedly installed on the surface of the shell, the annular tube is located in the inner cavity of the protective cover, the top and bottom of the annular tube are connected to the air inlet pipe, the inner side of the annular tube is connected to the purge assembly, the purge assembly is distributed around the inner side of the annular tube, and the middle end of the inner wall of the shell is fixedly connected to a feed ring and a discharge ring.

[0012] As a preferred solution of the coal mill feeding device of the present invention, the right side of the feeding ring is fixedly connected to the left side of the discharging ring, and the air outlet end of the purge assembly penetrates into the inner cavity of the discharging ring.

[0013] As a preferred solution of the coal mill feeding device described in the present invention, the purge assembly includes an air outlet pipe, which is fixedly installed in the discharge ring, the air inlet end of the air outlet pipe is connected with the annular pipe, the air outlet end of the air outlet pipe passes through the inner cavity of the discharge ring, a tee is fixedly connected to the top of the inner cavity of the air outlet pipe, and the left and right sides of the bottom of the tee are connected to the air outlet head, a first through hole is opened at the center of the top of the tee, and second through holes are opened on the left and right sides of the bottom of the tee, and the second through hole is connected to the top of the air outlet head.

[0014] As a preferred solution of the coal mill feeding device described in the present invention, a control component is installed at the bottom of the inner cavity of the air outlet pipe, and the control component includes a cylinder, the top of the cylinder is fixedly connected to the inner wall of the air outlet pipe, the surface of the cylinder is sleeved with an electromagnetic coil, the inner wall of the cylinder is movably connected with a sliding rod used in conjunction with the electromagnetic coil, the surface of the sliding rod is movably sleeved with a reset spring, the reset spring is located in the inner cavity of the cylinder, the bottom of the sliding rod is fixedly connected with a telescopic rod, and the surface of the telescopic rod is movably connected to the inner wall of the cylinder.

[0015] As a preferred solution of the coal mill feeding device described in the present invention, the left and right sides of the bottom of the telescopic rod are rotatably connected to the first connecting rod, the bottom of the first connecting rod is rotatably connected to the second connecting rod, the bottom of the second connecting rod is rotatably connected to the opening and closing piece, the opposite side of the two opening and closing pieces is rotatably connected to the fixing piece, the fixing piece is fixedly installed on the air outlet end of the bottom of the air outlet pipe, the bottom of the cylinder is fixedly connected to the fixing bracket, the bottom of the fixing bracket is fixedly connected to the wind shield, the wind shield is sleeved on the outside of the first connecting rod and the second connecting rod and is located on the top of the opening and closing piece.

[0016] A coal mill feeding system further includes a raw coal bunker and a coal feeder, wherein the discharge end of the raw coal bunker is connected to the feed end of the coal feeder, and the discharge end of the coal feeder is connected to the feed end of the feed hopper;

[0017] The raw coal bin is used to store raw coal and provide raw material for the coal feeder. A conical discharge hopper is provided at the bottom of the raw coal bin. The bottom of the conical discharge hopper is a 60-70° inclined structure, which uses gravity to accelerate the flow of coal. The inner wall of the conical discharge hopper is provided with a high-chromium cast iron layer or a wear-resistant ceramic layer. A vibrator is installed on the surface of the conical discharge hopper, and the operating frequency of the vibrator is 15-30 Hz.

[0018] The coal feeder is used to feed raw coal into the feed hopper. The coal feeder includes a variable frequency speed regulating screw conveyor. The speed range of the variable frequency speed regulating screw conveyor is 0~30 r / min. The discharge port of the variable frequency speed regulating screw conveyor is connected to the feed port of the feed hopper, and a sealing structure is provided at the connection.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention significantly improves the sealing performance and leakage prevention ability of the pulverizer feeding device through the synergistic effect of the purge mechanism and the sealing filler. The purge mechanism introduces factory air through the annular pipe, forms a high-speed airflow through the purge component, continuously flushes the inner wall of the sealing filler, removes the attached coal slurry, and effectively prevents the sealing surface from being blocked or leaking due to the accumulation of coal slurry. At the same time, the sealing filler adopts high-temperature resistant and wear-resistant materials, combined with the dynamically adjusted purge air volume, which not only ensures the cleanliness of the sealing surface, but also avoids the maintenance cost of frequent replacement of traditional sealing structures due to coal slurry adhesion. In addition, the design of the air outlet pipe, feed ring and discharge ring of the purge component further optimizes the coal flow path, reduces the impact of coal on the purge component, and extends the service life of the equipment. This design is particularly suitable for industrial scenarios such as thermal power generation and cement production that have strict requirements on sealing and continuous operation, and significantly reduces the risk of downtime and maintenance costs caused by leakage.

[0021] 2. Through the innovative design of the control assembly, this invention achieves precise dynamic regulation of the purge air volume, thereby balancing cleaning efficiency and energy consumption optimization. The control assembly dynamically controls the air volume output of the air outlet by adjusting the opening and closing angles of the flaps in real time based on the load status of the pulverizer or the feed rate through the PLC / DCS system. For example, during high-load operation, the flaps rotate upward to increase airflow velocity, quickly clearing the coal slurry and preventing blockage. During low-load operation, the flaps engage the fixed flaps to reduce air volume and energy consumption. This intelligent regulation mechanism not only avoids the wear of seals and packings caused by excessive purge in traditional fixed-air-volume systems, but also significantly reduces the cost of compressed air or nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0023] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0024] Figure 3 It is a partial cross-sectional view of the present invention;

[0025] Figure 4 is a cross-sectional view of the purge mechanism of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the air inlet pipe, circular pipe and purge assembly of the present invention;

[0027] Figure 6 is a cross-sectional view of a purge assembly of the present invention;

[0028] Figure 7 This is a cross-sectional view of the tee pipe and the air outlet of the present invention;

[0029] Figure 8is a cross-sectional view of a control assembly of the present invention;

[0030] Figure 9 It is a cross-sectional view of the telescopic cylinder of the present invention.

[0031] In the figure: 1. Feed hopper; 2. Purge mechanism; 3. Hoop; 4. Coal mill; 5. Bracket; 6. Base; 7. Drive assembly; 8. Discharge pipe; 9. Drum screen; 10. Sealing packing; 11. Bearing; 12. Feed pipe; 201. Housing; 202. Protective cover; 203. Air inlet pipe; 204. Ring pipe; 205. Discharge ring; 206. Purge assembly; 207. Feed ring; 208. Discharge pipe. 209. Tee pipe; 210. Threaded ring; 211. Control assembly; 212. Air outlet; 213. Second through hole; 214. First through hole; 215. Cylinder; 216. Electromagnetic coil; 217. Telescopic rod; 218. First connecting rod; 219. Second connecting rod; 220. Opening and closing piece; 221. Fixed piece; 222. Wind shield; 223. Fixed bracket; 224. Sliding rod; 225. Return spring. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1

[0033] Reference Figures 1-9 This embodiment provides a coal mill feeding device, including a feed hopper 1, a purge mechanism 2 connected to the discharge end of the feed hopper 1, a clamp 3 fixedly installed at the connection between the feed hopper 1 and the purge mechanism 2, and a coal mill cylinder 4 connected to the discharge end of the purge mechanism 2.

[0034] Furthermore, a feed pipe 12 is provided at one end of the coal grinding cylinder 4, and a discharge pipe 8 is provided at the other end of the coal grinding cylinder 4. A bracket 5 is rotatably connected to the feed pipe 12 and the discharge pipe 8. A bearing 11 is sleeved on the surface of the feed pipe 12, and a sealing packing 10 is provided at the feed end of the feed pipe 12. The sealing packing 10 seals the end faces of the feed pipe 12 and the bearing 11. The blowing mechanism 2 blows annular air toward the inner wall of the sealing packing 10 to clean the coal slurry and prevent coal slurry leakage.

[0035] Furthermore, a base 6 is fixedly connected to the bottom of the bracket 5 , a driving assembly 7 is installed on the surface of the coal grinding cylinder 4 , and the driving assembly 7 is fixedly installed on the top of the base 6 .

[0036] Furthermore, the discharge end of the discharge pipe 8 is connected to a drum screen 9 .

[0037] Furthermore, the purge mechanism 2 includes a shell 201 , a feed end of the shell 201 is fixedly connected to a discharge end of the feed hopper 1 , and the discharge end of the shell 201 is fixedly mounted on the bracket 5 and communicated with a feed end of the feed pipe 12 .

[0038] Furthermore, a protective cover 202 and an annular tube 204 are fixedly installed on the surface of the shell 201. The annular tube 204 is located in the inner cavity of the protective cover 202. The top and bottom of the annular tube 204 are connected to the air inlet pipe 203. The inner side of the annular tube 204 is connected to the purge assembly 206. The purge assembly 206 is distributed around the inner side of the annular tube 204. The middle end of the inner wall of the shell 201 is fixedly connected to a feed ring 207 and a discharge ring 205.

[0039] Furthermore, the inner diameter of the left side of the feed ring 207 is larger than the inner diameter of the right side, and the inner diameter of the right side of the discharge ring 205 is larger than the inner diameter of the left side.

[0040] Furthermore, the right side of the feed ring 207 is fixedly connected to the left side of the discharge ring 205 , and the air outlet end of the purge assembly 206 penetrates into the inner cavity of the discharge ring 205 .

[0041] Furthermore, the purge assembly 206 includes an air outlet pipe 208, which is fixedly installed in the discharge ring 205. The air inlet end of the air outlet pipe 208 is connected to the annular pipe 204, and the air outlet end of the air outlet pipe 208 passes through the inner cavity of the discharge ring 205. A tee pipe 209 is fixedly connected to the top of the inner cavity of the air outlet pipe 208, and the left and right sides of the bottom of the tee pipe 209 are connected to the air outlet head 212. A first through hole 214 is opened at the center of the top of the tee pipe 209, and a second through hole 213 is opened on the left and right sides of the bottom of the tee pipe 209. The second through hole 213 is connected to the top of the air outlet head 212.

[0042] Furthermore, a control component 211 is installed at the bottom of the inner cavity of the air outlet pipe 208, and the control component 211 includes a cylinder 215. The top of the cylinder 215 is fixedly connected to the inner wall of the air outlet pipe 208, and an electromagnetic coil 216 is sleeved on the surface of the cylinder 215. The inner wall of the cylinder 215 is movably connected to a slide rod 224 used in conjunction with the electromagnetic coil 216, and a return spring 225 is movably sleeved on the surface of the slide rod 224. The return spring 225 is located in the inner cavity of the cylinder 215, and a telescopic rod 217 is fixedly connected to the bottom of the slide rod 224. The surface of the telescopic rod 217 is movably connected to the inner wall of the cylinder 215.

[0043] Furthermore, the left and right sides of the bottom of the telescopic rod 217 are rotatably connected to the first connecting rod 218, the bottom of the first connecting rod 218 is rotatably connected to the second connecting rod 219, the bottom of the second connecting rod 219 is rotatably connected to the opening and closing piece 220, and the opposite side of the two opening and closing pieces 220 is rotatably connected to the fixed piece 221, the fixed piece 221 is fixedly installed on the air outlet end of the bottom of the air outlet pipe 208, the bottom of the cylinder 215 is fixedly connected to the fixing bracket 223, the bottom of the fixing bracket 223 is fixedly connected to the wind shield 222, the wind shield 222 is sleeved on the outside of the first connecting rod 218 and the second connecting rod 219 and is located on the top of the opening and closing piece 220.

[0044] Furthermore, the slide rod 224 is a permanent magnet, and a piston is provided on the top of the slide rod 224 , and the piston is slidably connected to the inner wall of the cylinder 215 .

[0045] Furthermore, a threaded ring 210 is fixedly connected to the top of the inner wall of the air outlet pipe 208, and a threaded head is provided on the inner side of the annular tube 204. The threaded head is installed in the inner cavity of the threaded ring 210 and is threadedly connected thereto.

[0046] During the operation of the coal mill feeding device, coal and water enter from the feed hopper 1, enter the coal mill cylinder 4 through the purge mechanism 2 and the feed pipe 12, and the drive assembly 7 drives the coal mill cylinder 4 to rotate. The steel rods inside the coal mill cylinder 4 are lifted to a certain height and then fall freely. The coal is crushed and finely ground through impact and friction. The coal is gradually ground into coal slurry in the cylinder 215, and the coal enters the drum screen 9 through the discharge pipe 8 for screening.

[0047] The annular tube 204 in the purge mechanism 2 introduces factory air as a purge medium through the air inlet pipe 203. The air is distributed to the purge component 206 through the annular tube 204. The air outlet pipe 208 of the purge component 206 directs the wind force to the inner wall of the sealing filler 10, forming an annular high-speed airflow to flush, remove the attached coal slurry, and prevent the sealing surface from being blocked or leaking. The control component 211 is energized through the electromagnetic coil 216, driving the slide rod 224 to move downward, compressing the return spring 225 and driving the telescopic rod 217 to move. The telescopic rod 217 drives the first connecting rod 218 and the second connecting rod 219 to rotate to adjust the opening and closing angle of the opening and closing piece 220. The air volume of the air outlet head 212 is adjusted by opening and closing the opening and closing piece 220 to achieve precise control of the purge air. The coal slurry cleaned by the purge mechanism 2 enters the coal grinding cylinder 4 through the feed pipe 12.

[0048] When the coal flows inside the shell 201, it first enters the feed ring 207, then enters the discharge ring 205 through the feed ring 207, and finally passes through the discharge ring 205 into the feed pipe 12. The feed ring 207 guides the incoming coal so that it can smoothly enter the discharge ring 205. The discharge ring 205 clamps the purge assembly 206 to prevent the coal from colliding with the purge assembly 206 and causing damage to it. When the air enters the air outlet pipe 208, it first enters the tee pipe 209. The tee pipe 209 divides the air into two air outlet heads 212 through the first through hole 214 and the second through hole 213. The two air outlet heads 212 divide the air into two compressed air streams and enter the left and right sides of the inner cavity of the air outlet pipe 208. The two air streams finally pass through two corresponding The opening and closing pieces 220 are discharged. When the opening and closing pieces 220 rotate upward, the air discharge speed is increased and the cleaning force is improved. When the opening and closing pieces 220 rotate downward, the two opening and closing pieces 220 fit on the left and right sides of the fixed piece 221, reducing the air discharge speed and reducing the cleaning force. By dynamically adjusting the air volume, it is ensured that the blowing airflow can not only completely remove the coal slurry, but also avoid the wear of the sealing packing 10 caused by excessive air volume. The blowing air is adjusted according to the load or feed speed of the coal mill 4, and the blowing air volume is adjusted to match the production rhythm. The operating status of the coal mill 4 is received through the PLC / DCS system. The blowing air volume is increased during high-load operation to ensure rapid transportation of coal slurry and prevent blockage. During low-load operation, the air volume is reduced to reduce energy consumption while keeping the sealing packing 10 clean. Example 2

[0049] Reference Figures 1-9 This embodiment is based on embodiment 1 and provides a coal mill feeding system, including a coal mill feeding device, a raw coal bin and a coal feeder, the discharge end of the raw coal bin is connected to the feed end of the coal feeder, and the discharge end of the coal feeder is connected to the feed end of the feed hopper 1.

[0050] Furthermore, the raw coal bin is used to store raw coal and provide raw material supply for the coal feeder. A conical discharge hopper is provided at the bottom of the raw coal bin. The bottom of the conical discharge hopper is a 60-70° inclination structure, which uses gravity to accelerate the flow of coal. The inner wall of the conical discharge hopper is provided with a high-chromium cast iron layer or a wear-resistant ceramic layer. A vibrator is installed on the surface of the conical discharge hopper, and the operating frequency of the vibrator is 15~30Hz.

[0051] Furthermore, the coal feeder is used to feed the raw coal into the feed hopper 1. The coal feeder includes a variable frequency speed regulating screw conveyor. The speed range of the variable frequency speed regulating screw conveyor is 0~30 r / min. The discharge port of the variable frequency speed regulating screw conveyor is connected to the feed port of the feed hopper 1, and a sealing structure is provided at the connection.

[0052] The bottom of the raw coal bin adopts a conical discharge hopper with an inclination of 60-70 degrees, combined with the inner wall treatment of high-chromium cast iron or wear-resistant ceramic layer, which effectively reduces the risk of coal adhesion and blockage. At the same time, gravity is used to accelerate the flow of coal to ensure continuous feeding. The vibrator further assists in loosening the coal, avoiding the feeding interruption problem caused by coal bridging in traditional structures.

[0053] The coal feeder uses a variable frequency speed-regulating screw conveyor, which can dynamically adjust the feeding speed according to the load of the coal mill, match the production rhythm, and reduce energy consumption. For example, the speed is reduced at low load to save electricity, and the feeding amount is quickly increased at high load.

Claims

1. A coal mill feeding device, comprising a feeding hopper (1), characterized in that: The discharge end of the feed hopper (1) is connected to a purge mechanism (2), a clamp (3) is fixedly installed at the connection between the feed hopper (1) and the purge mechanism (2), and the discharge end of the purge mechanism (2) is connected to a coal grinding drum (4); A feed pipe (12) is provided at one end of the coal grinding cylinder (4), and a discharge pipe (8) is provided at the other end of the coal grinding cylinder (4). A bracket (5) is rotatably connected to the feed pipe (12) and the discharge pipe (8). A bearing (11) is sleeved on the surface of the feed pipe (12). A sealing packing (10) is provided at the feed end of the feed pipe (12). The sealing packing (10) seals the end faces of the feed pipe (12) and the bearing (11). The purge mechanism (2) blows annular air toward the inner wall of the sealing packing (10) to clean the coal slurry and prevent the coal slurry from leaking. The purge mechanism (2) comprises a shell (201), the feed end of the shell (201) is fixedly connected to the discharge end of the feed hopper (1), and the discharge end of the shell (201) is fixedly mounted on the bracket (5) and communicated with the feed end of the feed pipe (12); A protective cover (202) and an annular tube (204) are fixedly mounted on the surface of the shell (201); the annular tube (204) is located in the inner cavity of the protective cover (202); the top and bottom of the annular tube (204) are connected to an air inlet pipe (203); the inside of the annular tube (204) is connected to a purge assembly (206); the purge assembly (206) is distributed around the inside of the annular tube (204); a feed ring (207) and a discharge ring (205) are fixedly connected to the middle end of the inner wall of the shell (201); The purge assembly (206) includes an air outlet pipe (208), which is fixedly installed in the discharge ring (205), the air inlet end of the air outlet pipe (208) is connected to the annular pipe (204), the air outlet end of the air outlet pipe (208) passes through the inner cavity of the discharge ring (205), a three-way pipe (209) is fixedly connected to the top of the inner cavity of the air outlet pipe (208), the left and right sides of the bottom of the three-way pipe (209) are connected to the air outlet head (212), a first through hole (214) is opened at the center of the top of the three-way pipe (209), and a second through hole (213) is opened on the left and right sides of the bottom of the three-way pipe (209), and the second through hole (213) is connected to the top of the air outlet head (212).

2. The coal mill feeding device according to claim 1, characterized in that: The bottom of the bracket (5) is fixedly connected to a base (6), and a driving assembly (7) is installed on the surface of the coal grinding cylinder (4), and the driving assembly (7) is fixedly installed on the top of the base (6).

3. The coal mill feeding device according to claim 2, characterized in that: The discharge end of the discharge pipe (8) is connected to a drum screen (9).

4. The coal mill feeding device according to claim 3, characterized in that: The right side of the feed ring (207) is fixedly connected to the left side of the discharge ring (205), and the air outlet end of the purge assembly (206) penetrates into the inner cavity of the discharge ring (205).

5. The coal mill feeding device according to claim 4, characterized in that: A control assembly (211) is installed at the bottom of the inner cavity of the air outlet pipe (208), and the control assembly (211) includes a cylinder (215). The top of the cylinder (215) is fixedly connected to the inner wall of the air outlet pipe (208), and the surface of the cylinder (215) is provided with an electromagnetic coil (216). The inner wall of the cylinder (215) is movably connected to a slide rod (224) used in conjunction with the electromagnetic coil (216), and the surface of the slide rod (224) is movably provided with a return spring (225). The return spring (225) is located in the inner cavity of the cylinder (215), and the bottom of the slide rod (224) is fixedly connected to a telescopic rod (217), and the surface of the telescopic rod (217) is movably connected to the inner wall of the cylinder (215).

6. The coal mill feeding device according to claim 5, characterized in that: The left and right sides of the bottom of the telescopic rod (217) are rotatably connected to the first connecting rod (218), the bottom of the first connecting rod (218) is rotatably connected to the second connecting rod (219), the bottom of the second connecting rod (219) is rotatably connected to the opening and closing piece (220), the two opening and closing pieces (220) are rotatably connected to the fixing piece (221) on the opposite side, the fixing piece (221) is fixedly installed on the air outlet end of the bottom of the air outlet pipe (208), the bottom of the cylinder (215) is fixedly connected to the fixing frame (223), the bottom of the fixing frame (223) is fixedly connected to the wind shield (222), the wind shield (222) is sleeved on the outside of the first connecting rod (218) and the second connecting rod (219) and is located on the top of the opening and closing piece (220).

7. A coal mill feeding system, comprising the coal mill feeding device according to claim 6, characterized in that: It also includes a raw coal bunker and a coal feeder, wherein the discharge end of the raw coal bunker is connected to the feed end of the coal feeder, and the discharge end of the coal feeder is connected to the feed end of the feed hopper (1); The raw coal bin is used to store raw coal and provide raw material for the coal feeder. A conical discharge hopper is provided at the bottom of the raw coal bin. The bottom of the conical discharge hopper is a 60-70° inclined structure, which uses gravity to accelerate the flow of coal. The inner wall of the conical discharge hopper is provided with a high-chromium cast iron layer or a wear-resistant ceramic layer. A vibrator is installed on the surface of the conical discharge hopper, and the operating frequency of the vibrator is 15-30 Hz. The coal feeder is used to feed raw coal into the feed hopper (1). The coal feeder includes a variable frequency speed regulating screw conveyor. The speed range of the variable frequency speed regulating screw conveyor is 0-30 r / min. The discharge port of the variable frequency speed regulating screw conveyor is connected to the feed port of the feed hopper (1), and a sealing structure is provided at the connection.

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