Coal milling structure and coal mill

Abstract

The invention relates to the technical field of coal milling, in particular to a coal milling structure and a coal mill, the coal milling structure comprises a milling seat part, the milling seat part comprises a milling bowl, the inner side of the milling seat part is a milling area with a conical section, the inner bottom of the milling seat part is provided with a hemispherical bulge, and a bulk material belt is formed between the hemispherical bulge and the milling area; the grinding roller is parallel to the grinding area, and the distance between the grinding roller and the grinding area is a grinding gap; the adjusting part is used for driving the grinding roller to rotate so as to adjust the grinding gap; through the unique milling bowl design and the adjusting part, the problem that a gap is enlarged due to abrasion of the milling roller and the milling disc is effectively solved, parallel adjustment of the milling roller and a milling area can be achieved, the consistency of the rolling gap is ensured, and therefore the coal milling effect is improved, the service life of the milling roller is prolonged, and the equipment maintenance cost is reduced.

Description

Technical Field

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

[0002] Coal mill is a device that crushes coal blocks and grinds them into coal powder. It is widely used in thermal power generation, cement, metallurgy and other industries.

[0003] The working principle of the coal mill is to squeeze, grind and impact the coal blocks through the relative movement between the grinding disc and the grinding roller, and use hot air to dry and transport the coal powder. The coal powder is graded by the separator to ensure that the qualified coal powder enters the boiler combustion system, while the unground coal powder returns to the grinding disc for re-grinding.

[0004] The size of the gap between the grinding disc and the grinding roller directly reflects the particle size of the coal powder. The grinding disc and the grinding roller will cause wear due to friction during grinding. Over time, the wear will cause the gap to become larger and larger. Traditional medium-speed coal mills can achieve close contact with the grinding disc by adjusting the angle of the grinding roller. However, only adjusting the angle will cause an angle difference in the gap between the grinding roller and the grinding disc, and they are not parallel, so there will also be a problem of uneven particle size. Summary of the Invention

[0005] In view of the above problems existing in the existing coal grinding structure and coal grinding mill, the present invention is proposed.

[0006] The above technical problems are solved by the following technical solutions: The present invention proposes a coal grinding structure, comprising:

[0007] The grinding seat part includes a grinding bowl, and the inner side is a grinding area with a conical cross section;

[0008] The grinding roller is set parallel to the grinding zone, and the distance between them is the grinding gap;

[0009] An adjusting portion having a rotating end and a driving end;

[0010] The bottom end of the rotating end is provided with a rotating seat, and the driving end gives the rotating end a vertical downward force, which is limited by the rotating seat, so that the rotating end rotates with the rotating seat as the fulcrum, so that the grinding roller approaches / moves away from the grinding area, and the rolling gap is adjusted.

[0011] In a preferred embodiment of the coal grinding structure of the present invention, a plurality of scraping strips are installed at equal intervals on the outer side of the bottom of the grinding bowl along its circumference.

[0012] In a preferred embodiment of the coal grinding structure of the present invention, the inner bottom of the grinding bowl has a hemispherical protrusion, and a bulking belt is formed between the hemispherical protrusion and the grinding area.

[0013] In a preferred embodiment of the coal grinding structure of the present invention, a plurality of arc-shaped grinding protrusions are equidistantly arranged on the surface of the grinding zone, and the gap between two adjacent grinding protrusions forms a channel for the ground coal powder to be spun out.

[0014] In a preferred embodiment of the coal grinding structure of the present invention, the arc direction of the grinding protrusion is consistent with the rotation direction of the grinding bowl.

[0015] In a preferred embodiment of the coal grinding structure of the present invention: the regulating part further includes a pulling assembly;

[0016] The lifting assembly applies an upward pulling force to the grinding roller when the rotating end rotates downward, ensuring that the grinding roller is parallel to the inclined surface of the grinding area.

[0017] In a preferred embodiment of the coal grinding structure of the present invention: the pulling assembly includes a horizontally arranged crossbar and a connector;

[0018] The connector is used to connect the rotating end and the grinding roller;

[0019] The crossbar is provided with a slider that slides horizontally, and the slider is connected to the driving end and the connector respectively through a pressure rod and a lifting rod.

[0020] In a preferred embodiment of the coal grinding structure of the present invention: the pressure rod is used to convert the vertical force of the driving end into a horizontal force to achieve horizontal displacement of the slider on the crossbar;

[0021] When the slider moves horizontally along the cross bar, the lifting rod gives the connector an upward force to adjust the grinding roller angle at the end of the connector.

[0022] In a preferred embodiment of the coal grinding structure of the present invention: a reinforcement member is provided between the lifting rod and the cross bar;

[0023] The reinforcement is used to share the lifting force of the lifting rod.

[0024] A coal mill comprises any one of the above coal grinding structures.

[0025] The beneficial effects of the present invention are as follows: the present invention effectively solves the problem of increased gap between the grinding roller and the grinding disc caused by wear through the unique grinding bowl design and adjustment part, can achieve parallel adjustment of the grinding roller and the grinding area, ensure the consistency of the rolling gap, thereby improving the coal grinding effect, extending the service life of the grinding roller, and reducing equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0027] Figure 1 A three-dimensional structural diagram of a coal grinding structure is shown;

[0028] Figure 2 The structure diagram of the grinding seat part in the coal grinding structure is shown;

[0029] Figure 3 The structural diagram of the regulating part in the coal grinding structure is shown;

[0030] Figure 4 The structure diagram of the pulling assembly in the coal grinding structure is shown;

[0031] Figure 5 A structural diagram of the grinding protrusions in the coal grinding structure is shown;

[0032] Figure 6 Shown Figure 4 A magnified structural diagram at center A;

[0033] Figure 7 The structure diagram of the coal grinding structure and the coal grinding machine is shown. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0035] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0036] Reference Figure 1-4 , this embodiment provides a coal grinding structure, including,

[0037] The grinding seat 1 includes a grinding bowl 11, the inner side of which is a grinding area 111 with a conical cross section, and the inner bottom of which has a hemispherical protrusion 112, and a bulk belt 113 is formed between the hemispherical protrusion 112 and the grinding area 111;

[0038] The grinding roller 2 is arranged parallel to the grinding zone 111, and the distance between the two is the grinding gap;

[0039] The adjusting part 3 drives the grinding roller 2 to rotate to adjust the grinding gap.

[0040] The coal falls into the grinding bowl 11. Since the bottom of the grinding bowl 11 has a hemispherical protrusion 112, the coal that falls on the hemispherical protrusion 112 will slide evenly along its curved surface into the bulk material belt 113. The grinding bowl 11 is driven to rotate by the coal mill gearbox to generate centrifugal force. The centrifugal force causes the coal in the bulk material belt 113 to rotate into the grinding area 111. The coal in the grinding area 111 is crushed by the grinding gap between the grinding rollers 2 and turned into coal powder.

[0041] When the wear gap between the grinding roller 2 and the grinding area 111 becomes larger, the grinding roller 2 is driven closer to the grinding area 111 through the adjusting part 3, so that the rolling gap can be adjusted, thereby extending the service life of the grinding roller 2 and reducing the cost waste caused by replacement.

[0042] A plurality of scraping strips 12 are installed at equal intervals on the outer side of the bottom of the grinding bowl 11 along its circumference.

[0043] Specifically, the scraping bars 12 are rubber components, and there are no less than three of them. They rotate while the grinding bowl 11 rotates, and can scrape the fallen stones toward the slag channel.

[0044] The adjusting portion 3 has a rotating end 31 and a driving end 32;

[0045] The bottom end of the rotating end 31 has a rotating seat 33, and the driving end 32 applies a vertical downward force to the rotating end 31. The vertical downward force is limited by the rotating seat 33, so that the rotating end 31 rotates with the rotating seat 33 as the fulcrum, thereby realizing that the grinding roller 2 approaches / moves away from the grinding area 111.

[0046] Specifically, the telescopic end of the driving end 32 is rotatably connected to a telescopic rod, the bottom of the telescopic rod is rotatably connected to the upper part of the rotating end 31, and the rotating seat 33 at the bottom of the rotating end 31 is rotatably connected to the inner wall of the coal mill. The driving end 32 has a telescopic function. When it is vertically extended downward, the telescopic rod gives a downward force to the rotating end 31. Due to the restriction of the rotating seat 33, the downward force exerted on the rotating end 31 causes the rotating end 31 to rotate downward with the rotating seat 33 as the fulcrum under the action of the rotating seat 33, further driving the grinding roller 2 to approach the grinding area 111, so that the grinding gap can be reduced. It is suitable for adjustment and use after the grinding roller 2 and the grinding area 111 are excessively worn, which solves the problem of time-consuming and cost-intensive direct replacement.

[0047] The adjustment portion 3 also includes a lifting component 34;

[0048] When the rotating end 31 rotates downward, the pulling assembly 34 applies an upward pulling force to the grinding roller 2 to ensure that the grinding roller 2 is parallel to the inclined surface of the grinding area 111 .

[0049] The lifting assembly 34 includes a horizontally arranged crossbar 341 and a connector 342;

[0050] The connector 342 is used to connect the rotating end 31 and the grinding roller 2;

[0051] Specifically, the connector 342 includes a fixed rod and a turntable, the fixed rod is rotatably connected to the turntable, one end of the turntable is mounted with a bolt, a U-shaped groove begins to be provided at one end of the rotating end 31, a connecting rod is provided in the U-shaped groove, and a strip groove is provided at the connection between the fixed rod and the connecting rod. When the grinding roller 2 is coaxial with the rotating end 31, the fixed rod is attached to the bottom of the U-shaped groove, and the connecting rod is located in the middle section of the strip groove. When the grinding roller 2 is lifted upward, the bottom of the fixed rod is attached to the U-shaped groove and rotates upward, and at this time the connecting rod is located at the bottom of the strip groove.

[0052] A horizontally sliding slider 343 is provided on the crossbar 341 , and the slider 343 is connected to the driving end 32 and the connector 342 via a pressure rod 344 and a lifting rod 345 respectively.

[0053] The pressure rod 344 is used to convert the vertical force of the driving end 32 into a horizontal force, thereby achieving the horizontal displacement of the slider 343 on the crossbar 341;

[0054] When the slider 343 moves horizontally along the cross bar 341 , the lifting rod 345 applies an upward force to the connector 342 , thereby adjusting the angle of the grinding roller 2 at the end of the connector 342 .

[0055] Specifically, a movable groove is provided on the inner side of the cross bar 341, and the slider 343 slides horizontally in the movable groove. When the driving end 32 drives the telescopic rod to extend downward, the slider 343 is restricted by the movable groove, and thus the downward force is converted into a horizontal force, so that the slider 343 moves along the horizontal direction of the movable groove. While it moves, an upward pulling force is generated through the lifting rod 345, and the lifting force drives the bottom of the fixed rod to fit the U-shaped groove and rotate upward, finally realizing the reverse adjustment of the grinding roller 2, which is level with the inclined surface of the grinding area 111, ensuring the consistency of the grinding gap and improving the coal grinding effect.

[0056] Force analysis

[0057] Force on the driving end 32

[0058] Vertical downward force: The driving end 32 applies a force F downward through the telescopic rod 驱 This force is the driving force of the adjustment process, and its magnitude depends on the degree of wear between the grinding roller 2 and the grinding zone 111 and the required adjustment amount.

[0059] Force on the rotating end 31

[0060] Vertical downward force: The telescopic rod drives the force F at the end 32 驱 Transfer to the rotating end 31;

[0061] The reaction force of the rotating fulcrum: The rotating seat 33 acts as a fulcrum and exerts a reaction force F on the rotating end 31. 支 , a direction perpendicular to the rotation radius of the rotating end 31;

[0062] Horizontal force component: As the rotating end 31 rotates around the rotating base 33, the vertical downward force F 驱 will be decomposed into the horizontal component F 水平 and the vertical force F 垂直 , horizontal component F 水平 The force is transmitted to the fixed rod through the connecting rod, thereby driving the grinding roller 2 to move.

[0063] Force of the lifting assembly 34

[0064] The force of the pressure rod 344: The pressure rod 344 applies the vertical downward force F of the driving end 32 驱 Converted to horizontal force F 水平 , and passed to the slider 343;

[0065] Forces on the slider 343: The slider 343 slides horizontally in the movable groove of the crossbar 341 and is subjected to the following forces;

[0066] Horizontal force F 水平 : transmitted by the pressure rod 344;

[0067] The restraining force of the movable groove: restricts the slider 343 to slide only in the horizontal direction;

[0068] The force on the lifting rod 345: The lifting rod 345 applies the horizontal force F of the slider 343 水平 Converted into upward pulling force F 提拉 , and passed to connector 342.

[0069] Force on connector 342

[0070] Upward pulling force F 提拉 : transmitted by the lifting rod 345;

[0071] The restraining force at the connection between the fixed rod and the connecting rod: restricts the fixed rod from rotating around the connecting rod;

[0072] The rotation constraint force of the turntable: ensures that the grinding roller 2 can rotate around the turntable.

[0073] Force on grinding roller 2

[0074] Upward pulling force F 提拉 : The power is transmitted to the grinding roller 2 through the connector 342, so that the grinding roller 2 is lifted upward;

[0075] Reaction force of grinding zone 111: There is a grinding force F between grinding roller 2 and grinding zone 111. 研磨 , direction perpendicular to the grinding surface;

[0076] The restraining force of the rotating end 31 is transmitted through the fixed rod and the connecting rod to limit the movement direction of the grinding roller 2 and ensure its parallel relationship with the grinding area 111.

[0077] Force transmission and balance

[0078] Transmission of vertical force: vertical downward force F at the drive end 32 驱 The transmission is transmitted to the rotating end 31 through the telescopic rod, and then to the grinding roller 2 through the connecting rod and the fixed rod;

[0079] Transmission of horizontal force: The pressure rod 344 applies the vertical downward force F 驱 The force F is converted into a horizontal force, which is transmitted to the connector 342 through the slider 343 and the lifting rod 345, and finally the upward pulling force F 提拉 Acting on grinding roller 2;

[0080] Balance of force: During the adjustment process, the upward pulling force F exerted on the grinding roller 2 提拉 The reaction force F of the grinding zone 111 研磨 Achieve balance and ensure that the grinding roller 2 can adjust its angle smoothly and maintain a parallel relationship with the grinding area 111.

[0081] Through the above force analysis, it can be seen that when adjusting the angle of the grinding roller 2, the pulling component 34 realizes the parallel adjustment of the grinding roller 2 and the grinding area 111 through clever force conversion and transmission. This design not only solves the problem of inconsistent gaps caused by wear in traditional medium-speed coal mills, but also improves the coal grinding effect and equipment reliability.

[0082] Instructions for use: Coal falls into the grinding bowl 11. Since the bottom of the grinding bowl 11 is a hemispherical protrusion 112, the coal that falls on the hemispherical protrusion 112 will slide evenly along its arc surface to the bulk material belt 113. The grinding bowl 11 is driven to rotate by the coal mill gearbox to generate centrifugal force. The centrifugal force will cause the coal in the bulk material belt 113 to rotate into the grinding area 111. The coal in the grinding area 111 is crushed by the grinding gap between the grinding rollers 2 and turned into coal powder.

[0083] When the wear gap between the grinding roller 2 and the grinding area 111 becomes larger, the driving end 32 drives the telescopic rod to extend downward. Since the slider 343 is restricted by the movable groove, the downward force is converted into a horizontal force, so that the slider 343 moves along the horizontal direction of the movable groove. While moving, it will generate an upward pulling force through the pulling rod 345. The pulling force drives the bottom of the fixed rod to fit the U-shaped groove and rotate upward, finally realizing the reverse adjustment of the grinding roller 2, which is level with the inclined surface of the grinding area 111, ensuring the consistency of the grinding gap and improving the coal grinding effect.

[0084] As an optional embodiment:

[0085] Reference Figure 5 In one embodiment provided in the present application, a reinforcement member 346 is provided between the lifting rod 345 and the cross bar 341 ;

[0086] The reinforcement member 346 is used to share the lifting force of the lifting rod 345 .

[0087] Specifically, the reinforcement 346 includes a triangular plate, which is fixed to the bottom of the cross bar 341, and a strip groove is opened on the surface of the triangular plate. The direction of the strip groove is consistent with the inclination direction of the lifting rod 345, and a triangular support block is arranged on the inside of the strip groove. A load-bearing rod is provided through the middle section of the lifting rod 345, and the load-bearing rod passes through the strip groove and is supported on the plane end of the triangular support block, thereby reducing the tension on the lifting rod 345, avoiding the problem of loose connection due to vibration, and extending the service life of the equipment.

[0088] As an optional embodiment:

[0089] Reference Figure 6 In one embodiment provided in the present application, a plurality of arc-shaped grinding protrusions are equidistantly arranged on the surface of the grinding area 111, and the gap between two adjacent grinding protrusions forms a channel for the ground coal powder to be spun out.

[0090] The arc direction of the grinding protrusion is consistent with the rotation direction of the grinding bowl 11.

[0091] Specifically, each grinding protrusion is composed of a number of conical protrusions, which can increase the grinding force and break the coal blocks faster. The rotation channel allows the ground coal powder to rotate along its direction to the air outlet for discharge, making the coal powder discharge more convenient and avoiding the problem of poor discharge.

[0092] As an optional embodiment:

[0093] Reference Figure 7 In one embodiment provided in the present application, a coal mill comprises a coal grinding structure as described above.

[0094] The present invention effectively solves the problem of increased gap between the grinding roller and the grinding disc caused by wear through its unique grinding bowl design and adjustment part. It can achieve parallel adjustment of the grinding roller and the grinding area, ensure the consistency of the rolling gap, thereby improving the coal grinding effect, extending the service life of the grinding roller, and reducing equipment maintenance costs.

[0095] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A coal grinding structure, characterized by: include, The grinding seat part (1) includes a grinding bowl (11), the inner side of which is a grinding area (111) with a conical cross section; The grinding roller (2) is arranged parallel to the grinding zone (111), and the distance between the two is the grinding gap; An adjusting portion (3) having a rotating end (31) and a driving end (32); The bottom end of the rotating end (31) is provided with a rotating seat (33), and the driving end (32) gives the rotating end (31) a vertical downward force, and the vertical downward force is limited by the rotating seat (33), so that the rotating end (31) rotates with the rotating seat (33) as a fulcrum, so that the grinding roller (2) approaches / moves away from the grinding area (111), and the rolling gap is adjusted.

2. The coal grinding structure according to claim 1, characterized in that: A plurality of scraping strips (12) are installed at equal intervals on the outer side of the bottom of the grinding bowl (11) along its circumference.

3. The coal grinding structure according to claim 2, characterized in that: The inner bottom of the grinding bowl (11) is provided with a hemispherical protrusion (112), and a bulk material belt (113) is formed between the hemispherical protrusion (112) and the grinding area (111).

4. The coal grinding structure according to claim 3, characterized in that: The surface of the grinding area (111) is provided with a plurality of arc-shaped grinding protrusions at equal intervals, and the gap between two adjacent grinding protrusions forms a channel for the ground coal powder to be spun out.

5. The coal grinding structure according to claim 4, characterized in that: The arc direction of the grinding protrusion is consistent with the rotation direction of the grinding bowl (11).

6. The coal grinding structure according to claim 5, characterized in that: The adjusting portion (3) further includes a lifting component (34); The lifting component (34) applies an upward lifting force to the grinding roller (2) when the rotating end (31) rotates downward, ensuring that the grinding roller (2) is parallel to the inclined surface of the grinding area (111).

7. The coal grinding structure according to claim 6, characterized in that: The lifting assembly (34) includes a horizontally arranged crossbar (341) and a connector (342); The connector (342) is used to connect the rotating end (31) and the grinding roller (2); The crossbar (341) is provided with a horizontally sliding slider (343), and the slider (343) is connected to the driving end (32) and the connector (342) respectively via a pressure rod (344) and a lifting rod (345).

8. The coal grinding structure according to claim 7, characterized in that: The pressure rod (344) is used to convert the vertical force of the driving end (32) into a horizontal force, thereby achieving horizontal displacement of the slider (343) on the crossbar (341); When the slider (343) is displaced horizontally along the crossbar (341), the lifting rod (345) applies an upward force to the connector (342), thereby achieving angle adjustment of the grinding roller (2) at the end of the connector (342).

9. The coal grinding structure according to claim 8, characterized in that: A reinforcement member (346) is provided between the lifting rod (345) and the cross bar (341); The reinforcing member (346) is used to share the lifting force of the lifting rod (345).

10. A coal mill, characterized in that: The coal grinding structure comprises the coal grinding structure according to any one of claims 1 to 9.

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