Coal grinding device

Abstract

The invention discloses a coal grinding device, which belongs to the technical field of grinding and comprises a mounting frame, a rough grinding mechanism and a fine grinding mechanism. Wherein a plurality of limiting holes are formed in the mounting frame; the coarse grinding mechanism comprises a coarse grinding box, the bottom edge of the coarse grinding box is connected with the mounting frame, and the coarse grinding box is used for performing coarse grinding treatment on coal; the fine grinding mechanism comprises a fine grinding box, a first mounting frame is mounted on the edge of the top of the fine grinding box, and the first mounting frame is detachably connected with the mounting frame through a clamping mechanism and a limiting hole and is used for performing fine grinding treatment on the coal subjected to coarse grinding treatment; by means of the design, the rough grinding mode and the fine grinding mode of coal can be rapidly adjusted, and the coal caking condition in the fine grinding process can be prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding, and in particular relates to a coal grinding device. Background Art

[0002] As one of the most widely distributed fossil energy sources in the world, coal has been one of the main energy sources used by the human world since the 18th century. With the development of industrialization, coal plays an important role in many fields such as heavy industry, light industry, energy industry, and metallurgical industry, and is known as the "food of industry".

[0003] However, the traditional coal grinding device still has some shortcomings, such as:

[0004] First, coal grinding generally includes two stages: coarse grinding and fine grinding. During the fine grinding process, the heat generated by friction may cause coal powder to agglomerate, affecting the quality of coal powder and subsequent use;

[0005] Second, in some special scenarios, such as coke preparation or blast furnace injection in the steel industry, coal is usually used only as a reducing agent, so only coarse grinding is required. However, traditional grinding devices cannot achieve rapid switching between coarse grinding and fine grinding, resulting in low production efficiency and even waste of grinding resources.

[0006] In view of the deficiencies in the prior art, the present invention provides a coal grinding device to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a coal grinding device that can quickly adjust the coarse grinding and fine grinding methods of coal and prevent coal agglomeration during the fine grinding process.

[0008] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0009] A coal grinding device, comprising:

[0010] A mounting frame, wherein a plurality of limiting holes are provided on the mounting frame;

[0011] A coarse grinding mechanism, the coarse grinding mechanism comprising a coarse grinding box, the bottom edge of the coarse grinding box is connected to the mounting frame, and is used for coarse grinding of coal;

[0012] The fine grinding mechanism comprises a fine grinding box, a first mounting frame is installed on the top edge of the fine grinding box, and the first mounting frame is detachably connected to the mounting frame through the limiting hole via a snap mechanism, and is used for fine grinding the roughly ground coal.

[0013] Preferably, the rough grinding mechanism further comprises a pair of rough grinding rollers, a first drive motor, a second drive motor and an annular protrusion; wherein,

[0014] A pair of the coarse grinding roller shafts are each provided with a rotating shaft 1, and both ends of the rotating shaft 1 are rotatably connected to the inner wall of the coarse grinding box;

[0015] The driving motor 1 and the driving motor 2 are both installed outside the rough grinding box, and the output ends of the driving motor 1 and the driving motor 2 are respectively connected to one end of the rotating shaft 1;

[0016] The annular protrusions are arranged on the outer periphery of a pair of the rough grinding rollers and are distributed in a linear array, and the annular protrusions on the pair of rough grinding rollers are arranged in a staggered manner.

[0017] Preferably, the fine grinding mechanism further comprises a pair of fine grinding rollers and a pair of guide blocks; wherein,

[0018] A pair of the fine grinding roller shafts are each provided with a second rotating shaft, both ends of which are rotatably connected to the inner wall of the fine grinding box, and a driving motor 1 and a driving motor 2 are also installed on the outer side of the fine grinding box, and the output ends of the driving motor 1 and the driving motor 2 are respectively connected to one end of the second rotating shaft;

[0019] A first side portion of a pair of guide blocks is connected to the inner wall of the fine grinding box, a second side portion opposite to the first side portion is arc-shaped, and the arc is in contact with the outer circumference of the fine grinding roller, and a guide channel for coal discharge is provided on the second side portion of the guide block.

[0020] Preferably, it also includes a cooling mechanism, which includes a pair of guide blocks, a pair of connection heads and a plurality of fans; wherein,

[0021] A pair of the material guide blocks are made of semiconductor material;

[0022] A pair of the wiring heads are respectively installed on the outside of the fine grinding box and are electrically connected to the material guide block. The wiring heads are connected to an external power source and are used to achieve heat dissipation of the fine grinding roller through cooling of the material guide block.

[0023] Each of the fans is mounted on the second rotating shaft and driven by a first driving motor and a second driving motor.

[0024] Preferably, the engaging mechanism comprises an engaging block, a fan-shaped rotating plate and a limiting block; wherein,

[0025] The bottom of the snap-fit ​​block is connected to the first installation frame, and two first fan-shaped channels and a second fan-shaped channel are provided inside the snap-fit ​​block, and the second fan-shaped channel is located between the two first fan-shaped channels, and the height of the second fan-shaped channel is less than the height of the first fan-shaped channel; and one end of the first fan-shaped channel and the second fan-shaped channel is connected to the outside, and the other end is arranged inside the snap-fit ​​block and close to the top of the snap-fit ​​block;

[0026] There are two fan-shaped rotating plates in total, which are slidably connected in the first fan-shaped channel, and one end of the fan-shaped rotating plate is connected to the limit block, and the other end is connected to the limit rod, and the limit rod is slidably connected in the second fan-shaped channel.

[0027] Preferably, it further comprises a main material guide, the top of which is detachably connected to a second mounting frame mounted on the bottom edge of the fine grinding box via the engaging mechanism.

[0028] Preferably, a feeder is further included, and the bottom of the feeder is communicated with the top of the coarse grinding box.

[0029] Preferably, the fine grinding mechanism also includes a magnetic plate and a screen; the magnetic plate is installed on the bottom edge of the fine grinding box, and the screen is magnetically connected to the magnetic plate to filter the coal powder that is agglomerated due to uneven heat dissipation.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention designs a locking mechanism above the fine grinding mechanism and the main material guide, so that the fine grinding mechanism can be quickly disassembled from the coarse grinding mechanism. Similarly, the main material guide can be quickly separated from the fine grinding mechanism and directly installed below the coarse grinding mechanism, thereby realizing a rapid adjustment method for the coarse grinding and fine grinding of coal, further saving grinding resources.

[0032] 2. The present invention introduces a cooling mechanism. The material guide block is made of semiconductor material. It is electrically connected and cooled by an external power supply to effectively reduce the temperature of the fine grinding roller, prevent the coal powder from agglomerating due to friction heat, and ensure the quality of the coal powder and subsequent use. While driving motor 1 and driving motor 2 drive the fine grinding roller to rotate, they also drive the fan to rotate. The installation of the fan helps to further dissipate heat and maintain stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention.

[0034] Figure 2 It is a front view of the present invention.

[0035] Figure 3 It is a cross-sectional view of a certain viewing angle of the present invention.

[0036] Figure 4 It is a broken view from a certain perspective of the present invention.

[0037] Figure 5 It is a disconnected view from another perspective of the present invention.

[0038] Figure 6 The present invention Figure 5 A is a partial enlarged schematic diagram of the .

[0039] Figure 7 It is a partial structural schematic diagram of the engaging mechanism of the present invention.

[0040] Figure 8 It is a structural schematic diagram of the magnetic plate and other structures of the present invention.

[0041] in:

[0042] 1. Mounting frame; 11. Limiting hole;

[0043] 2. Rough grinding mechanism; 21. Rough grinding box; 22. Rough grinding roller; 23. Annular protrusion; 24. Driving motor 1; 25. Driving motor 2; 26. Rotating shaft 1;

[0044] 3. Fine grinding mechanism; 31. Fine grinding box; 32. Fine grinding roller; 33. Second rotating shaft; 34. Material guide block; 341. Material guide channel; 35. Second mounting frame; 36. Magnetic plate; 37. Screen;

[0045] 4. Cooling mechanism; 41. Wiring connector; 42. Fan;

[0046] 5. Clamping mechanism; 51. First mounting frame; 52. Clamping block; 53. Fan-shaped rotating plate; 54. Limiting block; 55. Limiting rod; 56. First fan-shaped channel; 57. Second fan-shaped channel;

[0047] 6. Feeder; 7. Main material guide. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0049] In the description of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0051] Embodiment 1

[0052] refer to Figure 1-Figure 8 This embodiment provides a coal grinding device, including: a coal grinding device, including:

[0053] The mounting frame 1 is provided with a plurality of limiting holes 11 ; and the limiting holes 11 are symmetrically arranged on both sides of the mounting frame 1 . In this embodiment, the mounting frame 1 is provided with four limiting holes 11 in total.

[0054] A coarse grinding mechanism 2, the coarse grinding mechanism 2 comprising a coarse grinding box 21, the bottom edge of the coarse grinding box 21 is connected to the mounting frame 1, and is used for coarse grinding of coal;

[0055] The fine grinding mechanism 3 comprises a fine grinding box 31, and a first mounting frame 51 is installed on the top edge of the fine grinding box 31. The first mounting frame 51 is detachably connected to the mounting frame 1 through the clamping mechanism 5 and the limiting hole 11, and is used for fine grinding the roughly ground coal.

[0056] Furthermore, the rough grinding mechanism 2 further includes a pair of rough grinding rollers 22, a driving motor 1 24, a driving motor 25 and an annular protrusion 23; wherein,

[0057] A pair of the coarse grinding rollers 22 are provided with a rotating shaft 26 at their shaft portions, and both ends of the rotating shaft 26 are rotatably connected to the inner wall of the coarse grinding box 21;

[0058] The driving motor 1 24 and the driving motor 2 25 are both installed on the outside of the rough grinding box 21, and the output ends of the driving motor 1 24 and the driving motor 2 25 are respectively connected to one end of the rotating shaft 1 26;

[0059] The annular protrusions 23 are disposed on the outer periphery of the pair of rough grinding rollers 22 and are distributed in a linear array, and the annular protrusions 23 on the pair of rough grinding rollers 22 are arranged in a staggered manner.

[0060] In this embodiment, the present invention first designs a coarse grinding mechanism 2 so that the coal can be initially coarsely ground, laying the foundation for subsequent fine grinding, and the staggered arrangement of the annular protrusions 23 helps to improve the grinding efficiency and uniformity; secondly, by opening a limiting hole 11 on the mounting frame 1, the fine grinding box 31 can be quickly installed and disassembled, thereby improving the flexibility of the equipment and the convenience of maintenance.

[0061] Furthermore, the fine grinding mechanism 3 further includes a pair of fine grinding rollers 32 and a pair of guide blocks 34; wherein,

[0062] A pair of the fine grinding rollers 32 are provided with a second rotating shaft 33 at their shaft portions, and both ends of the second rotating shaft 33 are rotatably connected to the inner wall of the fine grinding box 31, and a driving motor 1 24 and a driving motor 2 25 are also installed on the outer side of the fine grinding box 31, and the output ends of the driving motor 1 24 and the driving motor 2 25 are respectively connected to one end of the second rotating shaft 33;

[0063] A first side portion of a pair of guide blocks 34 is connected to the inner wall of the fine grinding box 31, and a second side portion opposite to the first side portion is arc-shaped, and the arc is in contact with the outer periphery of the fine grinding roller 32, and a guide channel 341 for coal discharge is provided on the second side portion of the guide block 34.

[0064] It should be noted that the driving motor 1 24 and the driving motor 2 25 should rotate in opposite directions to achieve the coal grinding function.

[0065] In order to help filter out coal powder that has agglomerated due to uneven heat dissipation during the grinding process, ensure the purity and quality of the coal powder, and reduce the difficulty of subsequent processing, in this embodiment, the fine grinding mechanism 3 also includes a magnetic plate 36 and a screen 37; the magnetic plate 36 is installed on the bottom edge of the fine grinding box 31, and the screen 37 is magnetically connected to the magnetic plate 36, and is used to filter out coal powder that has agglomerated due to uneven heat dissipation.

[0066] Working principle: when the coal needs to be coarsely ground and finely ground, the drive motor 1 24 and the drive motor 2 25 in the start device are started, and a pair of coarse grinding rollers 22 move in opposite directions under the action of the drive motors to achieve coarse grinding of the coal; large pieces of coal are sent to the coarse grinding box 21 through the feeder 6, and are ground by the coarse grinding rollers 22 to be converted into smaller coal particles; the coarsely ground coal particles are guided by the guide block 34 and sent to the fine grinding box 31 for further fine grinding; in the fine grinding box 31, the coal particles are ground by the fine grinding rollers 32 to form finer coal powder; the finely ground coal powder is sent to the screen 37 through the guide channel 341 of the guide block 34, and the screen 37 is used to filter out agglomerated coal powder particles formed due to uneven heat dissipation during the grinding process; then the finer coal powder is sent to the bottom of the main guide 7 to complete the coal fine grinding process.

[0067] In this embodiment, the present invention enables further fine grinding of the roughly ground coal through the design of the fine grinding box 31 and the fine grinding roller 32, thereby improving the fineness and uniformity of the coal powder, and the design of the guide block 34 helps to guide the flow of coal and discharge it through the guide channel 341, thereby improving the efficiency of the coal flow and the continuity of the grinding process.

[0068] Embodiment 2

[0069] refer to Figure 2-Figure 4 On the basis of the first embodiment, the coal grinding device designed by the present invention further includes a cooling mechanism 4, which includes a pair of guide blocks 34, a pair of terminal heads 41 and a plurality of fans 42; wherein,

[0070] The pair of guide blocks 34 are made of semiconductor material;

[0071] A pair of the wiring heads 41 are respectively installed on the outside of the fine grinding box 31 and are electrically connected to the material guide block 34. The wiring heads 41 are connected to an external power source and are used to cool the fine grinding roller 32 through the cooling of the material guide block 34.

[0072] Each of the fans 42 is mounted on the second rotating shaft 33 and is driven by a first driving motor 24 and a second driving motor 25 .

[0073] Working principle: The terminal head 41 is electrically connected to the external power supply, and the terminal head 41 is connected to the material guide block 34 inside the fine grinding box 31. The material guide block 34 is made of semiconductor material. This material has good thermal conductivity and can effectively absorb and conduct heat. The material guide block 34 is in contact with the fine grinding roller 32, and the heat dissipation of the fine grinding roller 32 is achieved through electrical connection and external power supply cooling; the fan 42 is installed on the rotating shaft 2 33 and is driven by the drive motor 1 24 and the drive motor 2 25. The fan 42 works while the fine grinding roller 32 rotates, and assists in heat dissipation by increasing air flow to maintain stable operation of the equipment.

[0074] In this embodiment, the material guide block 34 of the fine grinding mechanism 3 not only serves as a material guide device, but also can be used as a coal cooling device. Therefore, the material guide block 34 is made of semiconductor material, and it is cooled by electrical connection and external power supply, which effectively reduces the temperature of the fine grinding roller 32, prevents coal powder from agglomerating due to friction heat, and ensures the quality of coal powder and subsequent use; while the driving motor 1 24 and / or the driving motor 2 25 drives the fine grinding roller 32 to rotate, it also drives the fan 42 to rotate, achieving two birds with one stone. The installation of the fan 42 helps to further dissipate heat and maintain stable operation of the equipment.

[0075] Embodiment 3

[0076] refer to Figure 1-Figure 8 On the basis of the first and second embodiments, the engaging mechanism 5 designed by the present invention specifically comprises an engaging block 52, a fan-shaped rotating plate 53 and a limiting block 54; wherein,

[0077] The bottom of the snap-fit ​​block 52 is connected to the first installation frame 51, and two first fan-shaped channels 56 and a second fan-shaped channel 57 are provided inside the snap-fit ​​block 52, and the second fan-shaped channel 57 is located between the two first fan-shaped channels 56, and the height of the second fan-shaped channel 57 is less than the height of the first fan-shaped channel 56; and one end of the first fan-shaped channel 56 and the second fan-shaped channel 57 is connected to the outside, and the other end is arranged inside the snap-fit ​​block 52 and close to the top of the snap-fit ​​block 52;

[0078] There are two fan-shaped rotating plates 53 , which are slidably connected in the first fan-shaped channel 56 , and one end of the fan-shaped rotating plate 53 is connected to the limit block 54 , and the other end is connected to the limit rod 55 , and the limit rod 55 is slidably connected in the second fan-shaped channel 57 .

[0079] It should be noted that, in this embodiment, there are eight engaging blocks 52 and eight limiting blocks 54 , wherein four engaging blocks 52 and four limiting blocks 54 are installed on each first installation frame 51 ; the size of the engaging block 52 is adapted to the size of the limiting hole 11 .

[0080] In order to effectively guide the coal into the fine grinding box 31 , in this embodiment, a main material guide 7 is also included, and the top of the main material guide 7 is detachably connected to the second installation frame 35 installed on the bottom edge of the fine grinding box 31 through the clamping mechanism 5 .

[0081] It should be noted that two rectangular holes 11 are also respectively formed on the two side edges of the second installation frame 35 .

[0082] In order to allow the coal to smoothly enter the coarse grinding box 21 , in this embodiment, a feeder 6 is further included, and the bottom of the feeder 6 is connected to the top of the coarse grinding box 21 .

[0083] Working principle: when only coarse grinding of the coal is required, the limit block 54 and the fan-shaped rotating plate 53 are rotated toward the device through the card and mechanism, so that the fine grinding box 31 is also removed from the bottom of the coarse grinding box 21, and the total material guide 7 is detached from the bottom of the fine grinding box 31. After detachment, the total material guide 7 is directly connected to the bottom of the coarse grinding box 21 through the card and mechanism. The specific steps are: first insert the locking block 52 into the limit hole 11 of the mounting frame 1, and then rotate the limit block 54 and the fan-shaped rotating plate 53 away from the device until the bottom of the limit block 54 is in contact with the mounting frame 1, so as to realize the locking of the total material guide 7 with the coarse grinding box 21.

[0084] In this embodiment, the present invention introduces a locking mechanism 5, and the locking mechanism 5 is designed above the fine grinding mechanism 3 and the main material guide 7, so that the fine grinding mechanism 3 can be quickly disassembled from the coarse grinding mechanism 2. Similarly, the main material guide 7 can also be quickly separated from the fine grinding mechanism 3 and directly installed under the coarse grinding mechanism 2, thereby realizing a rapid adjustment method for the coarse grinding and fine grinding of coal, further saving grinding resources.

[0085] In summary, the present invention, through the combination of the above-mentioned structures, not only improves the efficiency and quality of coal grinding, but also enhances the flexibility of the equipment and the convenience of maintenance, while also solving some problems existing in traditional grinding devices, such as coal powder agglomeration and waste of grinding resources.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A coal grinding device, characterized in that: include: A mounting frame (1), wherein a plurality of limiting holes (11) are provided on the mounting frame (1); A coarse grinding mechanism (2), the coarse grinding mechanism (2) comprising a coarse grinding box (21), the bottom edge of the coarse grinding box (21) being connected to the mounting frame (1) and being used for coarse grinding the coal; A fine grinding mechanism (3), the fine grinding mechanism (3) comprising a fine grinding box (31), a first mounting frame (51) being mounted on the top edge of the fine grinding box (31), the first mounting frame (51) being detachably connected to the mounting frame (1) through the stop hole (11) via a snap-fit ​​mechanism (5), and being used for fine grinding the roughly ground coal.

2. The coal grinding device according to claim 1, characterized in that: The rough grinding mechanism (2) further comprises a pair of rough grinding rollers (22), a first drive motor (24), a second drive motor (25) and an annular protrusion (23); wherein: A pair of the coarse grinding rollers (22) are each provided with a rotating shaft (26) at their shaft portions, and both ends of the rotating shaft (26) are rotatably connected to the inner wall of the coarse grinding box (21); The driving motor 1 (24) and the driving motor 2 (25) are both installed outside the rough grinding box (21), and the output ends of the driving motor 1 (24) and the driving motor 2 (25) are respectively connected to one end of the rotating shaft 1 (26); The annular protrusions (23) are arranged on the outer periphery of a pair of the rough grinding rollers (22) and are distributed in a linear array, and the annular protrusions (23) on the pair of rough grinding rollers (22) are arranged in a staggered manner.

3. The coal grinding device according to claim 2, characterized in that: The fine grinding mechanism (3) further comprises a pair of fine grinding rollers (32) and a pair of guide blocks (34); wherein: A pair of the fine grinding rollers (32) are each provided with a second rotating shaft (33), and both ends of the second rotating shaft (33) are rotatably connected to the inner wall of the fine grinding box (31), and a driving motor (24) and a driving motor (25) are also installed on the outer side of the fine grinding box (31), and the output ends of the driving motor (24) and the driving motor (25) are respectively connected to one end of the second rotating shaft (33); A first side portion of a pair of guide blocks (34) is connected to the inner wall of the fine grinding box (31), and a second side portion opposite to the first side portion is arc-shaped, and the arc is in contact with the outer periphery of the fine grinding roller (32), and a guide channel (341) for coal discharge is provided on the second side portion of the guide block (34).

4. The coal grinding device according to claim 3, characterized in that: It also includes a cooling mechanism (4), the cooling mechanism (4) including a pair of material guide blocks (34), a pair of connection heads (41) and a plurality of fans (42); wherein: The pair of material guide blocks (34) are made of semiconductor material; A pair of the wiring heads (41) are respectively installed on the outside of the fine grinding box (31) and are electrically connected to the material guide block (34); the wiring heads (41) are connected to an external power source and are used to achieve heat dissipation of the fine grinding roller (32) through refrigeration of the material guide block (34); Each of the fans (42) is mounted on the second rotating shaft (33) and is driven by a first driving motor (24) and a second driving motor (25).

5. The coal grinding device according to claim 1, characterized in that: The engaging mechanism (5) comprises an engaging block (52), a fan-shaped rotating plate (53) and a limiting block (54); wherein: The bottom of the locking block (52) is connected to the first installation frame (51), and two first fan-shaped channels (56) and a second fan-shaped channel (57) are provided inside the locking block (52), and the second fan-shaped channel (57) is located between the two first fan-shaped channels (56), and the height of the second fan-shaped channel (57) is less than the height of the first fan-shaped channel (56); and one end of the first fan-shaped channel (56) and the second fan-shaped channel (57) is in communication with the outside, and the other end is arranged inside the locking block (52) and close to the top of the locking block (52); There are two fan-shaped rotating plates (53) in total, which are slidably connected in the first fan-shaped channel (56), and one end of the fan-shaped rotating plate (53) is connected to the limit block (54), and the other end is connected to the limit rod (55), and the limit rod (55) is slidably connected in the second fan-shaped channel (57).

6. The coal grinding device according to claim 5, characterized in that: It also comprises a main material guide (7), the top of which is detachably connected to a second mounting frame (35) mounted on the bottom edge of the fine grinding box (31) via the snap-fit ​​mechanism (5).

7. The coal grinding device according to claim 1, characterized in that: It also includes a feeder (6), the bottom of which is connected to the top of the coarse grinding box (21).

8. The coal grinding device according to claim 4, characterized in that: The fine grinding mechanism (3) further comprises a magnetic plate (36) and a sieve (37); the magnetic plate (36) is mounted on the bottom edge of the fine grinding box (31), and the sieve (37) is magnetically connected to the magnetic plate (36) for filtering coal powder that has agglomerated due to uneven heat dissipation.

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