A coal milling device for thermal power generators and its usage method

Abstract

This invention discloses a coal grinding device for a thermal power generator and its usage method. The device includes a cylinder containing a grinding disc mechanism and a grinding roller mechanism. The grinding disc mechanism includes a rotary drive device, a rotating disk, and an grinding disc. The rotating disk is connected to the rotary drive device, and the grinding disc is located above the rotating disk. A spring is installed between the grinding disc and the rotating disk. The grinding disc has a central material drop area and grinding channels, with the grinding channels located at the edge of the grinding disc. Several control plates are installed between the central material drop area and the grinding channels, and an angle control mechanism is installed at the bottom of the grinding disc. This invention uses control plates to intervene in and control the movement of coal, maintaining the amount of coal in the grinding channels within a relatively stable range. This effectively avoids excessive coal accumulation in the grinding channels, which could cause pressure overload between the grinding roller and the grinding disc, reducing the probability of deformation and damage to the grinding disc and roller. It also prevents insufficient coal in the grinding channels, which would reduce grinding efficiency.

Description

Technical Field

[0001] This invention relates to the field of coal grinding equipment technology, and in particular to a coal grinding equipment for thermal power generators and its method of use. Background Technology

[0002] Thermal power generating units typically use coal as fuel, heating water in a boiler to convert it into steam, which then drives a gas turbine to generate electricity. When using coal as fuel, it needs to be ground into powder using coal milling equipment to improve combustion efficiency.

[0003] In existing coal grinding equipment, the core components include a rotatable grinding disc and one or more rotatable grinding rollers. The grinding disc is provided with annular grinding channels, and the grinding rollers are set on the grinding channels. During operation, the grinding disc and grinding rollers rotate simultaneously, and the grinding rollers roll in the grinding channels on the grinding disc. Coal falls into the central area of ​​the grinding disc through the feed pipe. When the grinding disc rotates, the coal is subjected to the centrifugal force of rotation and moves towards the edge of the grinding disc. During the process of moving towards the edge, the coal passes through the grinding channels and is ground into powder under the crushing action of the grinding rollers. The ground coal powder continues to move towards the edge of the grinding disc until it is discharged from the edge of the grinding disc.

[0004] Under normal operating conditions, a certain pressure is maintained between the grinding rollers and the grinding disc, which is used to crush and grind the coal. However, 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, thus forming a thicker material layer between the grinding disc and the grinding rollers. This will significantly increase the pressure load between the grinding rollers and the grinding disc. If the amount of coal entering the grinding channel is not controlled, the pressure load between the grinding rollers and the grinding disc will further increase, leading to overload of the grinding disc and grinding rollers, causing significant damage to the equipment, reducing its service life, and potentially causing deformation and damage to the grinding disc or grinding rollers. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art and provide a coal pulverizing device for thermal power generators and its usage method.

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

[0007] Preferably, the control plates are arranged in a circular array, each with a control plate shaft. The abrasive disc has shaft holes corresponding to the control plate shafts, through which the control plate shafts pass. The angle control mechanism includes a first transmission cylinder, a second transmission cylinder, a gear ring, and a gear. The gear is located at the lower end of the control plate shaft. The gear ring is rotatably located at the lower end of the abrasive disc, meshing with the gear ring. A swing arm is located on the outer side of the gear ring, with a connecting shaft on the swing arm. A fixed shaft is located at the lower end of the abrasive disc. One end of the second transmission cylinder is rotatably connected to the fixed shaft, and the other end is rotatably connected to the connecting shaft. The first and second transmission cylinders are connected by a connecting pipe. Both the first and second transmission cylinders are filled with hydraulic oil.

[0008] When the abrasive disc moves downward relative to the rotating disc, the first transmission cylinder is compressed and retracts. 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 gear ring to rotate. When the gear ring rotates, it drives the control plate to rotate in the first direction to reduce the passage area between two adjacent control plates.

[0009] Preferably, the first transmission cylinder includes a first cylinder body, which is fixedly mounted on a rotating disk. A first piston is disposed within 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 disposed 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 cylinder includes a second cylinder body, which contains a second piston. A second oil chamber is formed between the second piston and one end of the second cylinder body, and a return spring is disposed between the second piston and the other end of the second cylinder body. One end of a connecting pipe communicates with the first oil chamber, and the other end of the connecting pipe communicates with the second oil chamber. Both the first and second oil chambers are filled with hydraulic oil.

[0010] Preferably, the grinding roller mechanism includes a grinding roller frame, a grinding roller, and a grinding roller motor. The grinding roller frame is fixedly installed inside the cylinder, and the grinding roller motor is fixedly installed on the grinding roller frame and connected to the grinding roller. The grinding roller rolls along the abrasive groove.

[0011] Preferably, the upper end of the cylinder is provided with a powder outlet, and the lower end of the cylinder is provided with a fan.

[0012] Preferably, the system also includes a feed pipe, one end of which is located inside the cylinder and directly above the central material drop area, and the other end of which extends outside the cylinder.

[0013] Preferably, the rotating disk is provided with a guide rod, and the abrasive disk is provided with a guide hole corresponding to the guide rod, with the guide rod extending into the guide hole.

[0014] Preferably, the rotary drive device is connected to the inner wall of the cylinder via connecting stiffeners.

[0015] A method for using a coal mill for a thermal power generator, the specific method is as follows:

[0016] The rotary drive device drives the rotating disk and grinding disk to rotate, and the blower starts, forming an upward airflow inside the cylinder. The coal to be ground falls into the central dropping area on the grinding disk through the feed pipe. Under the centrifugal force of rotation, the coal on the grinding disk moves towards the edge of the grinding disk. When the coal passes through the grinding channel, it is ground into powder by the action of the grinding roller. After being ground, the coal powder continues to move towards the edge of the grinding disk. The upward airflow blows the coal powder upward and discharges it from the powder outlet at the top of the cylinder.

[0017] When the amount of coal in the grinding channel is too large, causing the pressure load on the grinding roller to increase, the grinding disc moves downward. At this time, the first transmission cylinder is compressed and retracts. 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 gear ring to rotate. When the gear ring rotates, it drives the control plate to rotate in the first direction to reduce the passage area between two adjacent control plates, thereby reducing the flow rate of coal from the central dropping area into the grinding channel.

[0018] The beneficial effects of this invention are: by intervening and controlling the movement of coal through the material control plate, the amount of coal in the grinding channel can be kept within a relatively stable range. This effectively avoids pressure overload between the grinding roller and the grinding disc caused by excessive coal accumulation in the grinding channel, reduces the probability of deformation and damage to the grinding disc and grinding roller, and improves the service life of the equipment; it also prevents the grinding efficiency from being reduced due to insufficient coal in the grinding channel. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the external structure of the present invention.

[0020] Figure 2 This is a cross-sectional view of the present invention.

[0021] Figure 3 for Figure 2 Enlarged view of section A.

[0022] Figure 4 This is a schematic diagram of the structure of the present invention after the cylinder body is removed.

[0023] Figure 5 This is a schematic diagram of the structure at the bottom of the abrasive disc.

[0024] Figure 6 This is a cross-sectional view of the second transmission cylinder.

[0025] In the diagram: 1. Cylinder body, 1a. Powder outlet, 2. Fan, 3. Feed pipe, 4. Grinding roller frame, 5. Grinding roller, 6. Rotary disk, 7. Rotary drive device, 8. Connecting rib plate, 9. Grinding disc, 9a. Central material drop area, 9b. Grinding groove, 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 Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0027] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0028] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0029] like Figures 1 to 6 As shown, a coal grinding device for a thermal power generator includes a cylinder 1, inside which a grinding disc mechanism and a grinding roller mechanism are arranged. The grinding disc mechanism includes a rotary drive device 7, a rotating disk 6, and a grinding disc 9. The rotating disk 6 is connected to the rotary drive device 7, and the grinding disc 9 is located above the rotating disk 6. A spring 10 is arranged between the grinding disc 9 and the rotating disk 6. The grinding disc 9 is provided with a central material drop area 9a and a grinding channel 9b, with the grinding channel 9b located in the edge area of ​​the grinding disc 9. Several material control plates 12 are arranged between the central material drop area 9a and the grinding channel 9b, and a passage area is formed between two adjacent material control plates 12. An angle control mechanism is provided at the bottom of the grinding disc 9, and the angle of each material control plate 12 is controlled by the angle control mechanism to adjust the size of the passage area between two adjacent material control plates 12.

[0030] Specifically, the control plates 12 are arranged in a circular array. Each control plate 12 has a control plate rotating shaft 17, and the abrasive disc 9 has a rotating shaft hole corresponding to the control plate rotating shaft 17, through which the control plate rotating shaft 17 passes. The angle control mechanism includes a first transmission cylinder 13, a second transmission cylinder 14, a gear ring 19, and a gear 21. The gear 21 is located at the lower end of the control plate rotating shaft 17. The gear ring 19 is rotatably mounted at the lower end of the abrasive disc 9, and the gear 21 meshes with the gear ring 19. A swing arm 20 is located on the outer side of the gear ring 19, and a connecting shaft 22 is mounted on the swing arm 20. A fixed shaft 18 is located at the lower end of the abrasive disc 9, and one end of the second transmission cylinder 14 is connected to the fixed shaft 18. 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; both the first transmission cylinder 13 and the second transmission cylinder 14 are filled with hydraulic oil; when the abrasive disk 9 moves downward relative to the rotating disk 6, the first transmission cylinder 13 is compressed and retracts, and the hydraulic oil inside the first transmission cylinder 13 is introduced into the second transmission cylinder 14 through the connecting pipe 15 to make the second transmission cylinder 14 extend. During the extension process, the second transmission cylinder 14 drives the gear ring 19 to rotate. When the gear ring 19 rotates, it drives the material control plate 12 to rotate in the first direction to reduce the passage area between two adjacent material control plates 12.

[0031] In this invention, the central material drop area 9a is a circular region, and the abrasive channel 9b is an annular region. The central material drop area 9a is located inside the abrasive channel 9b, and the bottom surface of the abrasive channel 9b is an arc surface. A rotary drive device 7 drives the rotating disk 6 to rotate, which in turn drives the abrasive disk 9 to rotate synchronously. A spring 10 is installed 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. Several control plates 12 arranged in a circular array are installed between the central material drop area 9a and the abrasive channel 9b. All control plates 12 can rotate synchronously under the control of an angle control mechanism. The synchronous rotation of all control plates 12 is ensured by the cooperation between the gear ring 19 and the gear 21. When all the control plates 12 rotate in the first direction, the passage area between two adjacent control plates 12 will decrease. That is, the actual passable area between the central material drop area 9a and the grinding channel 9b will decrease, and the obstruction effect of the control plates 12 on the movement of coal will increase. This can slow down the movement of coal from the central material drop area 9a to the grinding channel 9b, thereby reducing the flow rate of coal entering the grinding channel 9b and reducing the accumulation of coal in the grinding channel 9b. Conversely, when all the control plates 12 rotate in the second direction (i.e., the opposite direction to the first direction), the passage area between two adjacent control plates 12 will increase. That is, the actual passable area between the central material drop area 9a and the grinding channel 9b will increase, and the obstruction effect of the control plates 12 on the movement of coal will decrease. This can promote the movement of coal from the central material drop area 9a to the grinding channel 9b, thereby increasing the flow rate of coal entering the grinding channel 9b.

[0032] When a large amount of coal accumulates in the grinding channel 9b, a thicker material layer will inevitably form between the grinding disc 9 and the grinding roller 5, thereby increasing the pressure load between the grinding roller 5 and the grinding disc 9. At this time, the grinding disc 9 will move downwards due to the increased pressure, overcoming the resistance of the spring 10. When the grinding disc 9 moves downwards, the second transmission cylinder 14 in the angle control mechanism drives the gear ring 19 to rotate in one direction. When the gear ring 19 rotates, it drives all gears 21 to rotate synchronously. When the gears 21 rotate, they drive the control plate shaft 17 and the control plate 12 to rotate in the first direction, reducing the passage area between two adjacent control plates 12. This slows down the flow of coal into the grinding channel 9b, preventing further increase and accumulation of material in the grinding channel 9b, thereby suppressing the increase of pressure load between the grinding roller 5 and the grinding disc 9, and preventing excessive pressure load between the grinding roller 5 and the grinding disc 9 from causing deformation and damage to the grinding disc 9 or the grinding roller 5.

[0033] Conversely, when the amount of coal accumulated in the grinding channel 9b is small, a thinner material layer is formed between the grinding disc 9 and the grinding roller 5, thereby reducing the pressure load between the grinding roller 5 and the grinding disc 9. At this time, the grinding disc 9 will move upward. When the grinding disc 9 moves upward, the second transmission cylinder 14 in the angle control mechanism drives the gear ring 19 to rotate in another direction. When the gear ring 19 rotates, it drives all gears 21 to rotate synchronously. When the gears 21 rotate, they drive the control plate shaft 17 and the control plate 12 to rotate in the second direction (i.e., the opposite direction to the first direction), thereby increasing the passage area between two adjacent control plates 12, thereby increasing the flow rate of coal entering the grinding channel 9b and avoiding insufficient material in the grinding channel 9b, which would reduce grinding efficiency.

[0034] In this invention, the movement of coal is intervened and controlled by the material control plate 12, which can keep the amount of coal in the grinding channel 9b within a relatively stable range. This effectively avoids pressure overload between the grinding roller 5 and the grinding disc 9 caused by excessive coal accumulation in the grinding channel 9b, reduces the probability of deformation and damage to the grinding disc 9 and the grinding roller 5, and improves the service life of the equipment. It also prevents the grinding efficiency from being reduced due to insufficient coal in the grinding channel 9b.

[0035] The first transmission cylinder 13 includes a first cylinder body 13a, which is fixedly mounted on the rotating disk 6. A first piston 13b is disposed 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 disposed 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 cylinder 14 includes a second cylinder body 14a, which contains a second piston 14b. 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 disposed 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. Both the first oil chamber 13d and the second oil chamber 14e are filled with hydraulic oil.

[0036] When the abrasive disc 9 moves downward, it 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, increasing the volume of the second oil chamber 14e. The hydraulic oil in the second oil chamber 14e pushes the second piston 14b to move, causing the second piston rod 14d to extend outward, thereby increasing the overall length of the second transmission cylinder 14, which in turn drives the swing arm 20 and the gear ring. 19 rotates, causing the 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 control plate 12 to rotate in the second direction.

[0037] 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, with the guide rod 11 extending into the guide hole. The guide rod 11 is arranged along the axial direction of the abrasive disk 9. Through the cooperation between the guide rod 11 and the guide hole, the abrasive disk 9 can move up and down relative to the rotating disk 6, but the abrasive disk 9 and the rotating disk 6 cannot rotate relative to each other.

[0038] 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 installed inside the cylinder 1, and the grinding roller motor 16 is fixedly installed on the grinding roller frame 4 and connected to the grinding roller 5. The grinding roller 5 rolls along the abrasive groove 9b. The grinding roller 5 contacts the abrasive groove 9b. The grinding roller 5 is driven to rotate by the grinding roller motor 16.

[0039] 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 blower 2. The outer diameter of the grinding disc 9 is smaller than the inner diameter of the cylinder 1, and an annular gap is formed between the grinding disc 9 and the inner wall of the cylinder 1. The blower 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 grinding 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 cylinder.

[0040] The present invention includes a feed pipe 3, one end of which is located inside the cylinder 1 and directly above the central material drop area 9a, and the other end of which extends outside the cylinder 1. The coal to be ground is fed into the cylinder through the feed pipe 3 and falls into the central material drop area 9a of the grinding disc 9.

[0041] The rotary drive device 7 is connected to the inner wall of the cylinder 1 via connecting stiffeners 8. In this embodiment, the rotary drive device 7 is a geared motor.

[0042] The specific operating method for coal milling equipment used in thermal power plants is as follows:

[0043] The rotating drive device 7 drives the rotating disk 6 and the grinding disk 9 to rotate. The blower 2 is started, and an upward airflow is formed inside the cylinder 1 by the blower 2. The coal to be ground falls into the central dropping area 9a on the grinding disk 9 through the feed pipe 3. The coal on the grinding disk 9 moves towards the edge of the grinding disk 9 under the centrifugal force of rotation. When the coal passes through the grinding channel 9b, it is ground into powder by the action of the grinding roller 5. After being ground, the coal powder continues to move towards the edge of the grinding disk 9. The upward airflow blows the coal powder upward and discharges the coal powder from the powder outlet 1a at the top of the cylinder 1.

[0044] When the amount of coal in the abrasive channel 9b is too large, causing the pressure load on the grinding roller 5 to increase, the abrasive disc 9 moves downward. At this time, the first transmission cylinder 13 is compressed and retracts. 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 gear ring 19 to rotate. When the gear ring 19 rotates, it drives the control plate 12 to rotate in the first direction to reduce the passage area between two adjacent control plates 12, thereby reducing the flow rate of coal from the central dropping area 9a into the abrasive channel 9b.

[0045] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A coal milling device for a thermal power generator, characterized in that, The device includes a cylindrical body, inside which are a grinding disc mechanism and a grinding roller mechanism. The grinding disc mechanism includes a rotary drive device, a rotating disk, and an abrasive disc. The rotating disk is connected to the rotary drive device, and the abrasive disc is located above the rotating disk. A spring is installed between the abrasive disc and the rotating disk. The abrasive disc has a central material drop area and an abrasive channel, with the abrasive channel located at the edge of the abrasive disc. Several material control plates are installed between the central material drop area and the abrasive channel, forming a passage area between adjacent material control plates. An angle control mechanism is installed at the bottom of the abrasive disc, which controls the angle of each material control plate to adjust the size of the passage area between adjacent material control plates. The control plates are arranged in a circular array. Each control plate has a control plate shaft, and the abrasive disc has a shaft hole corresponding to the control plate shaft, through which the control plate shaft passes. The angle control mechanism includes a first transmission cylinder, a second transmission cylinder, a gear ring, and a gear. The gear is located at the lower end of the control plate shaft. The gear ring is rotatably located at the lower end of the abrasive disc, and the gear meshes with the gear ring. A swing arm is located on the outer side of the gear ring, and a connecting shaft is mounted on the swing arm. A fixed shaft is located at the lower end of the abrasive disc, and one end of the second transmission cylinder is rotatably connected to the fixed shaft. The other end of the second transmission cylinder is rotatably connected to the connecting shaft; the first transmission cylinder and the second transmission cylinder are connected by a connecting pipe; both the first transmission cylinder and the second transmission cylinder are filled with hydraulic oil; when the abrasive disc moves downward relative to the rotating disc, the first transmission cylinder is compressed and retracts, and the hydraulic oil inside the first transmission cylinder is introduced into the second transmission cylinder through the connecting pipe to make the second transmission cylinder extend. During the extension process, the second transmission cylinder drives the gear ring to rotate, and when the gear ring rotates, it drives the control plate to rotate in the first direction to reduce the passage area between two adjacent control plates.

2. The coal milling equipment for thermal power generators according to claim 1, characterized in that, The first transmission cylinder includes a first cylinder body, which is fixedly mounted on a rotating disk. A first piston is disposed within 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 disposed 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 cylinder includes a second cylinder body, which contains a second piston. A second oil chamber is formed between the second piston and one end of the second cylinder body, and a spring is disposed between the second piston and the other end of the second cylinder body. One end of a connecting pipe is connected to the first oil chamber, and the other end of the connecting pipe is connected to the second oil chamber. Both the first and second oil chambers are filled with hydraulic oil.

3. The coal milling equipment for thermal power generators according to claim 1, characterized in that, The grinding roller mechanism includes a grinding roller frame, a grinding roller, and a grinding roller motor. The grinding roller frame is fixedly installed inside the cylinder, and the grinding roller motor is fixedly installed on the grinding roller frame and connected to the grinding roller. The grinding roller rolls along the abrasive groove.

4. The coal milling equipment for thermal power generators according to claim 3, 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 blower.

5. The coal milling equipment for thermal power generators according to claim 3, characterized in that, It also includes a feed pipe, one end of which is located inside the cylinder and directly above the central material drop area, and the other end of which extends outside the cylinder.

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

7. The coal milling equipment for thermal power generators according to claim 1, characterized in that, The rotary drive device is connected to the inner wall of the cylinder via connecting stiffeners.

8. A method of using a coal mill for a thermal power generator, based on the coal mill for a thermal power generator as described in claim 5, characterized in that, The specific method is as follows: The rotary drive device drives the rotating disk and grinding disk to rotate, and the fan at the lower end of the cylinder starts, forming an upward airflow inside the cylinder. The coal to be ground falls into the central dropping area on the grinding disk through the feed pipe. Under the centrifugal force of rotation, the coal on the grinding disk moves towards the edge of the grinding disk. When the coal passes through the grinding channel, it is ground into powder by the action of the grinding roller. After being ground, the coal powder continues to move towards the edge of the grinding disk. The upward airflow blows the coal powder upward and discharges it from the powder outlet at the upper end of the cylinder. When the amount of coal in the grinding channel is too large, causing the pressure load on the grinding roller to increase, the grinding disc moves downward. At this time, the first transmission cylinder is compressed and retracts. 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 gear ring to rotate. When the gear ring rotates, it drives the control plate to rotate in the first direction to reduce the passage area between two adjacent control plates, thereby reducing the flow rate of coal from the central dropping area into the grinding channel.

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