Coal grinding equipment for thermal power generator and use method of coal grinding equipment

Abstract

The invention discloses coal grinding equipment for a thermal power generator and a using method thereof.The coal grinding equipment comprises a barrel, a grinding disc mechanism and a grinding roller mechanism are arranged in the barrel, the grinding disc mechanism comprises a rotary driving device, a rotary disc and a grinding disc, the rotary disc is connected with the rotary driving device, and the grinding disc is located above the rotary disc; a spring is arranged between the material grinding disc and the rotating disc; a central blanking area and an abrasive channel are arranged on the abrasive disc, and the abrasive channel is located in the edge area of the abrasive disc; a plurality of material control plates are arranged between the central blanking area and the material grinding channel, and an angle control mechanism is arranged at the bottom of the material grinding disc. Coal movement is intervened and controlled through the material control plate, the amount of coal in the material grinding channel can be kept within a stable range, pressure overload between the grinding roller and the material grinding disc caused by accumulation of excessive amount of coal in the material grinding channel is effectively avoided, and the probability of deformation and damage of the material grinding disc and the grinding roller is reduced; and the phenomenon that the grinding efficiency is reduced due to too small amount of coal in the grinding channel can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of coal grinding equipment, and in particular to a coal grinding equipment for a thermal power generator and a use method thereof. Background Art

[0002] Thermal power generating units usually use coal as fuel, heat the water in the boiler to increase the temperature and convert it into steam, and then use the steam at a certain pressure to drive the turbine to generate electricity. When using coal as fuel, it is necessary to grind the coal into powder through coal pulverizing equipment to improve the combustion efficiency of the coal.

[0003] The core components of the existing coal grinding equipment include a rotatable grinding disc and one or more rotatable grinding rollers. The grinding disc is provided with an annular abrasive channel, and the grinding roller is arranged on the abrasive channel. During operation, the grinding disc and the grinding roller rotate simultaneously, and the grinding roller rolls in the abrasive channel on the grinding disc; the coal falls into the central area of ​​the grinding disc through the feed pipe, and when the grinding disc rotates, the coal is subjected to the centrifugal effect of rotation and moves toward the edge of the grinding disc. In the process of moving toward the edge, the coal will pass through the abrasive channel, and the coal will be ground into powder under the crushing action of the grinding roller; the ground coal powder continues to move toward the edge of the grinding disc until it is discharged from the edge of the grinding disc.

[0004] Under normal working conditions, a certain range of pressure is maintained between the grinding roller and the grinding disc, and the coal is crushed and ground by this pressure. However, the existing coal grinding equipment cannot control or intervene in the movement of coal on the grinding disc. When the flow rate of coal entering the grinding channel from the central area is too large, the amount of coal accumulated in the grinding channel will increase, thereby forming a thicker material layer between the grinding disc and the grinding roller, which will significantly increase the pressure load between the grinding roller and the grinding disc. At this time, if the amount of coal entering the grinding channel is not controlled, the pressure load between the grinding roller and the grinding disc will further increase, resulting in pressure overload of the grinding disc and the grinding roller, causing greater damage to the equipment, reducing the service life of the equipment, and possibly causing deformation and damage to the grinding disc or grinding roller. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and to provide a coal grinding device for a thermal power generator and a method of using the same.

[0006] The objective of the present invention is achieved through the following technical scheme: a coal grinding device for a thermal power generator, comprising a cylinder, a grinding disc mechanism and a grinding roller mechanism are arranged in the cylinder, the grinding disc mechanism comprises a rotary drive device, a rotating disc, and an abrasive disc, the rotating disc is connected to the rotary drive device, the abrasive disc is located above the rotating disc, and a spring is arranged between the abrasive disc and the rotating disc; a central material drop area and an abrasive channel are arranged on the abrasive disc, and the abrasive channel is located at the edge area of ​​the abrasive disc; a plurality of material control plates are arranged between the central material drop area and the abrasive channel, and a passing area is formed between two adjacent material control plates; an angle control mechanism is arranged at the bottom of the abrasive disc, and the angle of each material control plate is controlled by the angle control mechanism to adjust the size of the passing area between two adjacent material control plates.

[0007] Preferably, the material control plates are arranged in a circular array, the material control plates are provided with material control plate shafts, the abrasive disc is provided with shaft holes corresponding to the material control plate shafts, and the material control plate shafts pass through the shaft holes; the angle control mechanism comprises a first transmission oil cylinder, a second transmission oil cylinder, a gear ring, and a gear, and the gear is arranged at the lower end of the material control plate shaft; the gear ring is rotatably arranged at the lower end of the abrasive disc, and the gear is meshed with the gear ring; a swing arm is arranged on the outer side of the gear ring, a connecting shaft is arranged on the swing arm, a fixed shaft is arranged at the lower end of the abrasive disc, one end of the second transmission oil cylinder is rotatably connected to the fixed shaft, and the other end of the second transmission oil cylinder is rotatably connected to the connecting shaft; the first transmission oil cylinder and the second transmission oil cylinder are connected via a connecting pipe; hydraulic oil is filled in the first transmission oil cylinder and the second transmission oil cylinder; When the abrasive disc moves downward relative to the rotating disc, the first transmission cylinder retracts under pressure, and the hydraulic oil inside the first transmission cylinder is introduced into the second transmission cylinder through the connecting pipe to extend the second transmission cylinder. During the extension process, the second transmission cylinder drives the ring gear to rotate, and when the ring gear rotates, it drives the material control plate to rotate in the first direction to reduce the passing area between two adjacent material control plates.

[0008] Preferably, the first transmission oil cylinder comprises a first cylinder body, which is fixedly arranged on a rotating disk, a first piston is arranged in the first cylinder body, and a first oil chamber is formed between the first piston and the lower end of the first cylinder body; a first piston rod is arranged at the upper end of the first piston, and the upper end of the first piston rod is connected to the abrasive disk; the second transmission oil cylinder comprises a second cylinder body, a second piston is arranged in the second cylinder body, a second oil chamber is formed between the second piston and one end of the second cylinder body, and a return spring is arranged between the second piston and the other end of the second cylinder body; one end of the connecting pipe is connected to the first oil chamber, and the other end of the connecting pipe is connected to the second oil chamber; the first oil chamber and the second oil chamber are both filled with hydraulic oil.

[0009] Preferably, the grinding roller mechanism comprises a grinding roller frame, a grinding roller, and a grinding roller motor. The grinding roller frame is fixedly arranged in the cylinder body, and the grinding roller motor is fixedly arranged on the grinding roller frame. The grinding roller motor is connected to the grinding roller; and the grinding roller rolls along the abrasive channel.

[0010] Preferably, a powder outlet is provided at the upper end of the cylinder, and a fan is provided at the lower end of the cylinder.

[0011] Preferably, a feed pipe is further included, one end of which is located inside the cylinder and directly above the central material drop zone, and the other end of the feed pipe extends outside the cylinder.

[0012] Preferably, a guide rod is provided on the rotating disk, and a guide hole corresponding to the guide rod is provided on the abrasive disk, and the guide rod extends into the guide hole.

[0013] Preferably, the rotary drive device is connected to the inner wall of the cylinder via a connecting rib plate.

[0014] A method for using a coal grinding device for a thermal power generator, the specific method is as follows: The rotating disc and the grinding disc are driven to rotate by the rotary drive device, and the fan is started, and an upward airflow is formed inside the cylinder through the fan; the coal to be ground falls into the central drop area on the grinding disc through the feed pipe, and the coal on the grinding disc moves toward the edge of the grinding disc under the action of rotating centrifugal force; when the coal passes through the grinding channel, it is ground into powder by the action of the grinding roller, and the coal powder continues to move toward the edge of the grinding disc after being ground, and is blown upward by the upward airflow and discharged from the powder outlet at the upper end of the cylinder; When there is too much coal in the abrasive channel and the pressure load of the grinding roller increases, the abrasive plate moves downward. At this time, the first transmission cylinder retracts under pressure, and the hydraulic oil inside the first transmission cylinder is introduced into the second transmission cylinder through the connecting pipe to extend the second transmission cylinder. During the extension process, the second transmission cylinder drives the ring gear to rotate. When the ring gear rotates, it drives the control plate to rotate in the first direction to reduce the passing area between the two adjacent control plates, thereby reducing the flow of coal from the central drop area into the abrasive channel.

[0015] The beneficial effects of the present invention are as follows: in the present invention, the movement of coal is intervened and controlled by the control plate, so that the amount of coal in the abrasive channel can be kept in a relatively stable range, which can effectively avoid the pressure overload between the grinding roller and the grinding disc caused by excessive accumulation of coal in the abrasive channel, reduce the probability of deformation and damage of the grinding disc and the grinding roller, and improve the service life of the equipment; and prevent the amount of coal in the abrasive channel from being too small and reducing the abrasive efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the appearance structure of the present invention.

[0017] Figure 2 It is a cross-sectional view of the present invention.

[0018] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0019] Figure 4 It is a schematic diagram of the structure after removing the cylinder body of the present invention.

[0020] Figure 5 Schematic diagram of the structure of the bottom of the abrasive disc.

[0021] Figure 6 It is a cross-sectional view of the second transmission cylinder.

[0022] In the figure: 1, cylinder, 1a, powder outlet, 2, fan, 3, feed pipe, 4, grinding roller frame, 5, grinding roller, 6, rotating disk, 7, rotating drive device, 8, connecting rib plate, 9, grinding disk, 9a, central drop area, 9b, abrasive channel, 10, spring, 11, guide rod, 12, control plate, 13, first transmission cylinder, 13a, first cylinder body, 13b, first piston, 13c, first piston rod, 13d, first oil chamber, 14, second transmission cylinder, 14a, second cylinder body, 14b, second piston, 14c, return spring, 14d, second piston rod, 14e, second oil chamber, 15, connecting pipe, 16, grinding roller motor, 17, control plate shaft, 18, fixed shaft, 19, gear ring, 20, swing arm, 21, gear, 22, connecting shaft. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0024] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0025] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0026] like Figures 1 to 6As shown, a coal grinding device for a thermal power generator comprises a cylinder 1, wherein a grinding disc mechanism and a grinding roller mechanism are arranged in the cylinder 1, wherein the grinding disc mechanism comprises a rotary drive device 7, a rotary disc 6, and an abrasive disc 9, wherein the rotary disc 6 is connected to the rotary drive device 7, wherein the abrasive disc 9 is located above the rotary disc 6, and wherein a spring 10 is arranged between the abrasive disc 9 and the rotary disc 6; wherein a central material drop area 9a and an abrasive channel 9b are arranged on the abrasive disc 9, wherein the abrasive channel 9b is located at an edge area of ​​the abrasive disc 9; wherein a plurality of material control plates 12 are arranged between the central material drop area 9a and the abrasive channel 9b, wherein a passing area is formed between two adjacent material control plates 12; wherein an angle control mechanism is arranged at the bottom of the abrasive disc 9, wherein the angle of each material control plate 12 is controlled by the angle control mechanism to adjust the size of the passing area between two adjacent material control plates 12.

[0027] Specifically, the material control plates 12 are arranged in a circular array, and a material control plate rotating shaft 17 is provided on the material control plate 12, and a rotating shaft hole corresponding to the material control plate rotating shaft 17 is provided on the abrasive disc 9, and the material control plate rotating shaft 17 passes through the rotating shaft hole; the angle control mechanism includes a first transmission oil cylinder 13, a second transmission oil cylinder 14, a gear ring 19, and a gear 21, and the gear 21 is arranged at the lower end of the material control plate rotating shaft 17; the gear ring 19 is rotatably arranged at the lower end of the abrasive disc 9, and the gear 21 is meshed with the gear ring 19; a swing arm 20 is provided on the outer side of the gear ring 19, and a connecting shaft 22 is provided on the swing arm 20, and a fixed shaft 18 is provided at the lower end of the abrasive disc 9, and one end of the second transmission oil cylinder 14 is connected to the fixed shaft 18. The shaft 18 is rotatably connected, and the other end of the second transmission cylinder 14 is rotatably connected to the connecting shaft 22; the first transmission cylinder 13 and the second transmission cylinder 14 are connected by a connecting pipe 15; the first transmission cylinder 13 and the second transmission cylinder 14 are both filled with hydraulic oil; when the abrasive disc 9 moves downward relative to the rotating disc 6, the first transmission cylinder 13 is compressed and retracted, and the hydraulic oil inside the first transmission cylinder 13 is introduced into the second transmission cylinder 14 through the connecting pipe 15 to extend the second transmission cylinder 14, and the second transmission cylinder 14 drives the ring gear 19 to rotate during the extension process, and when the ring gear 19 rotates, it drives the control plate 12 to rotate in the first direction to reduce the passing area between two adjacent control plates 12.

[0028] In the present invention, the central blanking area 9a is a circular area, the abrasive channel 9b is an annular area, the central blanking area 9a is located on the inner side of the abrasive channel 9b, and the bottom surface of the abrasive channel 9b is an arc surface. The rotating disk 6 is driven to rotate by the rotary drive device 7, and the abrasive disk 9 is driven to rotate synchronously when the rotating disk 6 rotates. A spring 10 is arranged between the abrasive disk 9 and the rotating disk 6. When the pressure on the abrasive disk 9 increases, the abrasive disk 9 will overcome the elastic force of the spring 10 and move downward relative to the rotating disk 6. A plurality of control plates 12 arranged in a circular array are arranged between the central blanking area 9a and the abrasive channel 9b, and all the control plates 12 can rotate synchronously under the control of the angle control mechanism. The synchronous rotation of all control plates 12 is ensured by the cooperation between the ring gear 19 and the gear 21. When all the control plates 12 rotate in the first direction, the passing area between two adjacent control plates 12 will be reduced, that is, the actual passable area between the central drop zone 9a and the abrasive channel 9b will be reduced, and the hindering effect of the control plates 12 on the movement of coal will be increased, which can slow down the movement of coal from the central drop zone 9a to the abrasive channel 9b, thereby reducing the flow of coal entering the abrasive channel 9b and reducing the accumulation of coal in the abrasive channel 9b; conversely, when all the control plates 12 rotate in the second direction (i.e., the direction opposite to the first direction), the passing area between two adjacent control plates 12 will be increased, that is, the actual passable area between the central drop zone 9a and the abrasive channel 9b will be increased, and the hindering effect of the control plates 12 on the movement of coal will be reduced, which can promote the movement of coal from the central drop zone 9a to the abrasive channel 9b, thereby increasing the flow of coal entering the abrasive channel 9b.

[0029] When the amount of coal accumulated in the abrasive channel 9b is large, a thicker material layer will inevitably be formed between the abrasive disc 9 and the grinding roller 5, thereby increasing the pressure load between the grinding roller 5 and the abrasive disc 9; at this time, the abrasive disc 9 will overcome the resistance of the spring 10 due to the increased pressure and move downward. When the abrasive disc 9 moves downward, the second transmission oil cylinder 14 in the angle control mechanism drives the ring gear 19 to rotate in one direction. When the ring gear 19 rotates, it drives all the gears 21 to rotate synchronously. When the gear 21 rotates, it drives the control plate shaft 17 and the control plate 12 to rotate in the first direction, so that the passing area between the two adjacent control plates 12 is reduced, thereby slowing down the flow of coal into the abrasive channel 9b, avoiding further increase and accumulation of materials in the abrasive channel 9b, thereby suppressing the increase of the pressure load between the grinding roller 5 and the abrasive disc 9, and avoiding excessive pressure load between the grinding roller 5 and the abrasive disc 9, which may cause deformation and damage of the abrasive disc 9 or the grinding roller 5.

[0030] On the contrary, when the amount of coal accumulated in the abrasive channel 9b is small, a thinner material layer is formed between the abrasive disc 9 and the grinding roller 5, thereby reducing the pressure load between the grinding roller 5 and the abrasive disc 9; at this time, the abrasive disc 9 will move upward; when the abrasive disc 9 moves upward, the second transmission cylinder 14 in the angle control mechanism drives the ring gear 19 to rotate in another direction, and when the ring gear 19 rotates, it drives all the gears 21 to rotate synchronously, and when the gear 21 rotates, it drives the control plate shaft 17 and the control plate 12 to rotate in the second direction (i.e., the direction opposite to the first direction), so that the passing area between two adjacent control plates 12 is increased, thereby increasing the flow rate of coal entering the abrasive channel 9b, and avoiding too little material in the abrasive channel 9b to reduce the abrasive efficiency.

[0031] In the present invention, the movement of coal is intervened and controlled by the control plate 12, so that the amount of coal in the abrasive channel 9b can be maintained in a relatively stable range, which can effectively avoid the pressure overload between the grinding roller 5 and the grinding disc 9 caused by excessive accumulation of coal in the abrasive channel 9b, reduce the probability of deformation and damage of the grinding disc 9 and the grinding roller 5, and improve the service life of the equipment; and prevent the amount of coal in the abrasive channel 9b from being too small to reduce the abrasive efficiency.

[0032] Among them, the first transmission oil cylinder 13 includes a first cylinder body 13a, which is fixedly arranged on the rotating disk 6, and a first piston 13b is arranged in the first cylinder body 13a, and a first oil chamber 13d is formed between the first piston 13b and the lower end of the first cylinder body 13a; a first piston rod 13c is arranged at the upper end of the first piston 13b, and the upper end of the first piston rod 13c is connected to the abrasive disk 9; the second transmission oil cylinder 14 includes a second cylinder body 14a, and a second piston 14b is arranged in the second cylinder body 14a, and a second oil chamber 14e is formed between the second piston 14b and one end of the second cylinder body 14a, and a return spring 14c is arranged between the second piston 14b and the other end of the second cylinder body 14a; one end of the connecting pipe 15 is connected to the first oil chamber 13d, and the other end of the connecting pipe 15 is connected to the second oil chamber 14e; the first oil chamber 13d and the second oil chamber 14e are both filled with hydraulic oil.

[0033] When the abrasive disc 9 moves downward, the abrasive disc 9 drives the first piston rod 13c and the first piston 13b to move downward. When the first piston 13b moves downward, the volume of the first oil chamber 13d decreases, and the hydraulic oil in the first oil chamber 13d enters the second oil chamber 14e through the connecting pipe 15, so that the volume of the second oil chamber 14e increases. The hydraulic oil in the second oil chamber 14e pushes the second piston 14b to move so that the second piston rod 14d extends outward, thereby increasing the overall length of the second transmission oil cylinder 14, thereby pushing the swing arm 20 and the gear ring. 19 rotates and causes the material control plate 12 to rotate in the first direction; conversely, when the abrasive disc 9 moves upward, the abrasive disc 9 drives the first piston rod 13c and the first piston 13b to move upward. When the first piston 13b moves upward, the volume of the first oil chamber 13d increases, and the hydraulic oil in the second oil chamber 14e flows back to the first oil chamber 13d through the connecting pipe 15. Under the action of the return spring 14c, the second piston rod 14d retracts, and the second transmission cylinder 14 drives the gear ring 19 to rotate in the opposite direction, and drives the material control plate 12 to rotate in the second direction.

[0034] The rotating disk 6 is provided with a guide rod 11, and the abrasive disk 9 is provided with a guide hole corresponding to the guide rod 11, and the guide rod 11 extends into the guide hole. The guide rod 11 is arranged along the axial direction of the abrasive disk 9, and the abrasive disk 9 can move up and down relative to the rotating disk 6 through the cooperation between the guide rod 11 and the guide hole, but the abrasive disk 9 and the rotating disk 6 cannot rotate relative to each other.

[0035] The grinding roller mechanism includes a grinding roller frame 4, a grinding roller 5, and a grinding roller motor 16. The grinding roller frame 4 is fixedly arranged in the cylinder 1, and the grinding roller motor 16 is fixedly arranged on the grinding roller frame 4. The grinding roller motor 16 is connected to the grinding roller 5. The grinding roller 5 rolls along the grinding material channel 9b. The grinding roller 5 contacts the grinding material channel 9b. The grinding roller 5 is driven to rotate by the grinding roller motor 16.

[0036] The upper end of the cylinder 1 is provided with a powder outlet 1a, and the lower end of the cylinder 1 is provided with a fan 2. The outer diameter of the abrasive disc 9 is smaller than the inner diameter of the cylinder 1, and an annular gap is formed between the abrasive disc 9 and the inner wall of the cylinder 1. The fan 2 generates an upward airflow inside the cylinder 1, and the airflow passes upward through the annular gap; when the coal powder moves to the edge of the abrasive disc 9, the upward airflow blows the coal powder upward, and the blown coal powder is finally discharged from the powder outlet 1a at the upper end of the barrel.

[0037] The present invention comprises a feed pipe 3, one end of which is located in the barrel 1 and just above the central drop zone 9a, and the other end of which extends outside the barrel 1. The coal to be ground is passed into the barrel through the feed pipe 3, and the coal falls into the central drop zone 9a of the grinding disc 9.

[0038] The rotation driving device 7 is connected to the inner wall of the cylinder 1 through the connecting rib plate 8. In this embodiment, the rotation driving device 7 is a reduction motor.

[0039] The method of using the coal grinding equipment for thermal power generators is as follows: The rotating disc 6 and the grinding disc 9 are driven to rotate by the rotating driving device 7, and the fan 2 is started, and an upward airflow is formed inside the cylinder 1 by the fan 2; the coal to be ground falls into the central drop area 9a on the grinding disc 9 through the feeding pipe 3, and the coal on the grinding disc 9 moves toward the edge of the grinding disc 9 under the action of the rotating centrifugal force; when the coal passes through the grinding channel 9b, the coal is ground into a powder state under the action of the grinding roller 5, and the coal powder after being ground continues to move toward the edge of the grinding disc 9, and the coal powder is blown upward by the upward airflow and discharged from the powder outlet 1a at the upper end of the cylinder 1; When there is too much coal in the abrasive channel 9b, causing the pressure load of the grinding roller 5 to increase, the abrasive disc 9 moves downward. At this time, the first transmission cylinder 13 is compressed and retracted, and the hydraulic oil inside the first transmission cylinder 13 is introduced into the second transmission cylinder 14 through the connecting pipe 15 to extend the second transmission cylinder 14. During the extension process, the second transmission cylinder 14 drives the ring gear 19 to rotate. When the ring gear 19 rotates, it drives the control plate 12 to rotate in the first direction to reduce the passing area between the two adjacent control plates 12, thereby reducing the flow of coal from the central drop area 9a into the abrasive channel 9b.

[0040] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A coal grinding device for a thermal power generator, characterized in that: It includes a cylinder body, in which a grinding disc mechanism and a grinding roller mechanism are arranged, the grinding disc mechanism includes a rotary driving device, a rotating disc, and an abrasive disc, the rotating disc is connected to the rotary driving device, the abrasive disc is located above the rotating disc, and a spring is arranged between the abrasive disc and the rotating disc; a central material dropping area and an abrasive channel are arranged on the abrasive disc, and the abrasive channel is located at the edge area of ​​the abrasive disc; a plurality of material control plates are arranged between the central material dropping area and the abrasive channel, and a passing area is formed between two adjacent material control plates; an angle control mechanism is arranged at the bottom of the abrasive disc, and the angle of each material control plate is controlled by the angle control mechanism to adjust the size of the passing area between two adjacent material control plates.

2. The coal grinding equipment for a thermal power generator according to claim 1, characterized in that: The material control plates are arranged in a circular array, and a material control plate rotating shaft is arranged on the material control plate, and a rotating shaft hole corresponding to the material control plate rotating shaft is arranged on the abrasive disc, and the material control plate rotating shaft passes through the rotating shaft hole; the angle control mechanism includes a first transmission oil cylinder, a second transmission oil cylinder, a gear ring, and a gear, and the gear is arranged at the lower end of the material control plate rotating shaft; the gear ring is rotatably arranged at the lower end of the abrasive disc, and the gear is meshed with the gear ring; a swing arm is arranged on the outer side of the gear ring, and a connecting shaft is arranged on the swing arm, and a fixed shaft is arranged at the lower end of the abrasive disc, one end of the second transmission oil cylinder is rotatably connected to the fixed shaft, and the other end of the second transmission oil cylinder is rotatably connected to the connecting shaft; the first transmission oil cylinder and the second transmission oil cylinder are connected via a connecting pipe; hydraulic oil is filled inside the first transmission oil cylinder and the second transmission oil cylinder; When the abrasive disc moves downward relative to the rotating disc, the first transmission cylinder retracts under pressure, and the hydraulic oil inside the first transmission cylinder is introduced into the second transmission cylinder through the connecting pipe to extend the second transmission cylinder. During the extension process, the second transmission cylinder drives the ring gear to rotate, and when the ring gear rotates, it drives the material control plate to rotate in the first direction to reduce the passing area between two adjacent material control plates.

3. The coal grinding equipment for a thermal power generator according to claim 2, characterized in that: The first transmission oil cylinder comprises a first cylinder body, which is fixedly arranged on a rotating disk, a first piston is arranged in the first cylinder body, and a first oil chamber is formed between the first piston and the lower end of the first cylinder body; a first piston rod is arranged at the upper end of the first piston, and the upper end of the first piston rod is connected to the abrasive disk; the second transmission oil cylinder comprises a second cylinder body, a second piston is arranged in the second cylinder body, a second oil chamber is formed between the second piston and one end of the second cylinder body, and a return spring is arranged between the second piston and the other end of the second cylinder body; one end of the connecting pipe is connected to the first oil chamber, and the other end of the connecting pipe is connected to the second oil chamber; the first oil chamber and the second oil chamber are both filled with hydraulic oil.

4. The coal grinding equipment for a thermal power generator according to claim 2, characterized in that: The grinding roller mechanism comprises a grinding roller frame, a grinding roller and a grinding roller motor. The grinding roller frame is fixedly arranged in the cylinder body, the grinding roller motor is fixedly arranged on the grinding roller frame, and the grinding roller motor is connected to the grinding roller; the grinding roller rolls along the abrasive channel.

5. The coal grinding equipment for a thermal power generator according to claim 4, characterized in that: The upper end of the cylinder is provided with a powder outlet, and the lower end of the cylinder is provided with a fan.

6. The coal grinding equipment for a thermal power generator according to claim 4, characterized in that: It also includes a feed pipe, one end of which is located in the cylinder and just above the central material drop zone, and the other end of the feed pipe extends outside the cylinder.

7. The coal grinding equipment for a thermal power generator according to claim 1, characterized in that: The rotating disk is provided with a guide rod, the abrasive disk is provided with a guide hole corresponding to the guide rod, and the guide rod extends into the guide hole.

8. The coal grinding equipment for a thermal power generator according to claim 1, characterized in that: The rotary drive device is connected to the inner wall of the cylinder through a connecting rib plate.

9. A method for using a coal grinding device for a thermal power generator, based on the coal grinding device for a thermal power generator according to claim 6, characterized in that: The specific method is as follows: The rotating disc and the grinding disc are driven to rotate by the rotary drive device, and the fan is started, and an upward airflow is formed inside the cylinder through the fan; the coal to be ground falls into the central drop area on the grinding disc through the feed pipe, and the coal on the grinding disc moves toward the edge of the grinding disc under the action of rotating centrifugal force; when the coal passes through the grinding channel, it is ground into powder by the action of the grinding roller, and the coal powder continues to move toward the edge of the grinding disc after being ground, and is blown upward by the upward airflow and discharged from the powder outlet at the upper end of the cylinder; When there is too much coal in the abrasive channel and the pressure load of the grinding roller increases, the abrasive plate moves downward. At this time, the first transmission cylinder retracts under pressure, and the hydraulic oil inside the first transmission cylinder is introduced into the second transmission cylinder through the connecting pipe to extend the second transmission cylinder. During the extension process, the second transmission cylinder drives the ring gear to rotate. When the ring gear rotates, it drives the control plate to rotate in the first direction to reduce the passing area between the two adjacent control plates, thereby reducing the flow of coal from the central drop area into the abrasive channel.

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