Coal grinding structure and coal mill

Abstract

The present application relates to coal grinding technical field, especially a kind of coal grinding structure and coal mill, including, grinding seat part, including mill bowl, inside is the grinding zone of cross section presents conical, its inner bottom has hemispherical protrusion, the hemispherical protrusion is formed with the scattering zone between material belt;Grinding roller, it is arranged in parallel with grinding zone, the spacing between the two is the gap of rolling pressure;Adjusting part, it drives grinding roller rotation and realizes the adjustment of the gap of rolling pressure;The present application effectively solves the problem of the gap increase caused by the wear of grinding roller and grinding disc by the unique design of mill bowl and adjusting part, can realize the parallel adjustment of grinding roller and grinding zone, ensure the consistency of the gap of rolling pressure, thereby improve the coal grinding effect, prolong the service life of grinding roller, reduce equipment maintenance cost.

Description

A coal grinding structure and a coal mill Technical Field

[0001] This invention relates to the field of coal grinding technology, and in particular to a coal grinding structure and a coal mill. Background Technology

[0002] Coal mills are devices that crush coal lumps and grind them into coal powder. They are widely used in industries such as thermal power generation, cement, and metallurgy.

[0003] The working principle of a coal mill is to squeeze, grind and impact coal blocks through the relative movement between the grinding disc and the grinding roller. At the same time, hot air is used to dry and transport the coal powder. The coal powder is classified by particle size through a separator to ensure that qualified coal powder enters the boiler combustion system, while the unground coal powder is returned 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 pulverized coal. During grinding, the grinding disc and the grinding roller will wear down through friction. 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, adjusting the angle alone will result in an angular difference between the grinding roller and the grinding disc, and they will not be parallel. Therefore, there will also be problems with inconsistent particle size. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned coal grinding structures and coal mills, the present invention is proposed.

[0006] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a coal grinding structure, comprising,

[0007] The grinding base includes the grinding bowl, with an inner grinding area having a conical cross-section.

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

[0009] The adjustment section has a rotating end and a driving end;

[0010] The bottom end of the rotating end has a rotating seat. The driving end applies a vertically downward force to the rotating end. The vertically downward force is restricted by the rotating seat, causing the rotating end to rotate around the rotating seat as a fulcrum, thereby moving the grinding roller closer to or further away from the grinding area and adjusting the crushing gap.

[0011] In a preferred embodiment of the coal grinding structure of the present invention: several scraper strips are installed at equal intervals along the circumference of the bottom outer side of the grinding bowl.

[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 material dispersion zone is formed between the hemispherical protrusion and the grinding zone.

[0013] In a preferred embodiment of the coal grinding structure of the present invention: the surface of the grinding zone 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 pulverized coal to be swirl out after grinding.

[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 milling structure of the present invention: the adjusting part further includes a lifting component;

[0016] The lifting assembly applies an upward lifting 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 zone.

[0017] In a preferred embodiment of the coal milling structure of the present invention: the lifting 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 equipped with a horizontally sliding slider, which is connected to the drive end and the connector via a pressure rod and a lifting rod, respectively.

[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 the horizontal force, so as to realize the horizontal displacement of the slider on the crossbar;

[0021] When the slider moves horizontally along the crossbar, the lifting rod applies an upward force to the connector, thereby adjusting the angle of the grinding roller at the connector end.

[0022] In a preferred embodiment of the coal milling structure of the present invention: a reinforcing member is provided between the lifting rod and the crossbar;

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

[0024] A coal mill comprising the coal milling structure as described in any of the preceding claims.

[0025] The beneficial effects of this invention are as follows: Through its unique grinding bowl design and adjustment mechanism, this invention effectively solves the problem of increased gap caused by wear between the grinding roller and the grinding disc, enabling parallel adjustment between the grinding roller and the grinding zone, ensuring the consistency of the grinding gap, thereby improving the coal grinding effect, extending the service life of the grinding roller, and reducing equipment maintenance costs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0027] Figure 1 shows a three-dimensional structural diagram of the coal mill structure;

[0028] Figure 2 shows a structural diagram of the mill base section in the coal mill structure;

[0029] Figure 3 shows a structural diagram of the regulating section in the coal mill structure;

[0030] Figure 4 shows a structural diagram of the lifting assembly in the coal mill structure;

[0031] Figure 5 shows a structural diagram of the grinding protrusions in the coal mill structure;

[0032] Figure 6 shows an enlarged structural diagram of point A in Figure 4;

[0033] Figure 7 shows the structure of the coal mill and the structural diagram of the coal mill. Detailed Implementation

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

[0035] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0036] Referring to Figures 1-4, this embodiment provides a coal grinding structure, including:

[0037] The grinding base part 1 includes a grinding bowl 11, with a grinding area 111 having a conical cross-section on the inner side. The bottom of the inner side has a hemispherical protrusion 112, and a material distribution zone 113 is formed between the hemispherical protrusion 112 and the grinding area 111.

[0038] Grinding roller 2 is arranged parallel to grinding zone 111, and the distance between them is the rolling gap;

[0039] Adjustment part 3 drives the grinding roller 2 to rotate, thereby adjusting the crushing gap.

[0040] Coal falls into the grinding bowl 11. Since the bottom of the grinding bowl 11 is a hemispherical protrusion 112, the coal falling on the hemispherical protrusion 112 will slide evenly along its arc surface into the material distribution belt 113 area. 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 material distribution belt 113 area to be spun into the grinding zone 111. The coal in the grinding zone 111 is crushed by the crushing gap between the grinding rollers 2 and becomes coal powder.

[0041] When the wear gap between the grinding roller 2 and the grinding zone 111 increases, the grinding roller 2 is driven to move closer to the grinding zone 111 by the adjustment part 3, so that the crushing gap is adjustable, the service life of the grinding roller 2 is extended, and the cost waste caused by replacement is reduced.

[0042] Several scraper strips 12 are installed at equal intervals along the circumference of the bottom outer side of the grinding bowl 11.

[0043] Specifically, the scraper 12 is a rubber component, and there must be at least three of them. It rotates while the grinding bowl 11 is rotating, and can scrape the falling stones toward the slag channel.

[0044] The adjusting part 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. The driving end 32 applies a vertically downward force to the rotating end 31. The vertically downward force is restricted by the rotating seat 33, so that the rotating end 31 rotates with the rotating seat 33 as the fulcrum, thereby making the grinding roller 2 move closer to / away from the grinding area 111.

[0046] Specifically, the telescopic end of the drive end 32 is rotatably connected to a telescopic rod. The bottom of the telescopic rod is rotatably connected to the top of the rotating end 31. The rotating seat 33 at the bottom of the rotating end 31 is rotatably connected to the inner wall of the coal mill. The drive end 32 has a telescopic function. When it extends vertically downward, the telescopic rod applies a downward force to the rotating end 31. Due to the restriction of the rotating seat 33, the downward force on the rotating end 31 causes the rotating end 31 to rotate downward with the rotating seat 33 as the fulcrum, further driving the grinding roller 2 closer to the grinding zone 111, thereby reducing the crushing gap. This is suitable for adjustment after the grinding roller 2 and the grinding zone 111 have been excessively worn, solving the problem of time-consuming and costly direct replacement.

[0047] Adjustment part 3 also includes lifting component 34;

[0048] When the lifting assembly 34 rotates downward at the rotating end 31, it applies an upward lifting force to the grinding roller 2, ensuring that the grinding roller 2 is parallel to the inclined surface of the grinding zone 111.

[0049] The lifting assembly 34 includes a horizontal bar 341 and a connector 342 arranged in the horizontal direction;

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

[0051] Specifically, connector 342 includes a fixed rod and a turntable. The fixed rod is rotatably connected to the turntable. One end of the turntable is bolted to install the grinding roller 2. One end of the rotating end 31 has a U-shaped groove. A connecting rod is installed in the U-shaped groove. A strip-shaped through groove is opened at the connection between the fixed rod and the connecting rod. When the grinding roller 2 and the rotating end 31 are coaxial, 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-shaped through 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. At this time, the connecting rod is located at the bottom of the strip-shaped through groove.

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

[0053] The pressure rod 344 is used to convert the vertical force of the drive end 32 into a horizontal force, so as to realize the horizontal displacement of the slider 343 on the crossbar 341.

[0054] When the slider 343 moves horizontally along the crossbar 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 crossbar 341, and the slider 343 slides horizontally in the movable groove. When the drive end 32 drives the telescopic rod to extend downward, the slider 343 is restricted by the movable groove, so the downward force is converted into a horizontal force, causing the slider 343 to move horizontally along the movable groove. At the same time, it will exert an upward lifting force through the lifting rod 345. The lifting force drives the bottom of the fixed rod to rotate upward against the U-shaped groove, and finally realizes the reverse adjustment of the grinding roller 2, which is horizontal with the inclined surface of the grinding zone 111, ensuring the consistency of the crushing gap and improving the coal grinding effect.

[0056] Force analysis

[0057] Force on drive end 32

[0058] Vertical downward force: The drive end 32 applies a downward force F 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 rotating end 31

[0060] Vertical downward force: The telescopic rod will exert a force F at the drive end 32. 驱 The signal is transmitted to the rotating end 31;

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

[0062] Horizontal component: Due to the rotation of the rotating end 31 around the rotating seat 33, the vertically downward force F 驱 It will be decomposed into a horizontal component F 水平 and vertical component F 垂直 Horizontal component F 水平 The transmission is transmitted to the fixed rod via the connecting rod, which in turn drives the grinding roller 2 to move.

[0063] Force on lifting component 34

[0064] Force on the pressure rod 344: The pressure rod 344 applies a vertically downward force F to the drive end 32. 驱 Converted into a horizontal force F 水平 And pass it to slider 343;

[0065] Forces acting on slider 343: Sliding horizontally within the movable groove of crossbar 341, slider 343 is subjected to the following forces;

[0066] Horizontal force F 水平 : Transmitted by pressure bar 344;

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

[0068] Force on lifting rod 345: The horizontal force F exerted by lifting rod 345 on slider 343 水平 Converted into an upward lifting force F 提拉 And pass it to connector 342.

[0069] Force on connector 342

[0070] Upward lifting force F 提拉 Transmitted by lifting rod 345;

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

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

[0073] Force on grinding roller 2

[0074] Upward lifting force F 提拉 The signal is transmitted to the grinding roller 2 via connector 342, causing the grinding roller 2 to lift upwards;

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

[0076] The constraint force of the rotating end 31 is transmitted through the fixed rod and the connecting rod, which restricts the movement direction of the grinding roller 2 and ensures its parallel relationship with the grinding zone 111.

[0077] Transmission and balance of forces

[0078] Transmission of vertical force: The downward vertical force F at the driving end 32 驱 The signal is transmitted to the rotating end 31 via the telescopic rod, and then to the grinding roller 2 via the connecting rod and the fixed rod.

[0079] Transmission of horizontal force: The pressure rod 344 transmits the vertically 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, ultimately resulting in an upward lifting force F. 提拉 Acting on grinding roller 2;

[0080] Force balance: During the adjustment process, the grinding roller 2 is subjected to an upward lifting force F. 提拉 The reaction force F with the grinding zone 111 研磨 To achieve balance, ensure that the grinding roller 2 can smoothly adjust its angle and maintain parallel relationship with the grinding zone 111.

[0081] Through the above force analysis, it can be seen that when adjusting the angle of the grinding roller 2, the lifting component 34 achieves parallel adjustment between the grinding roller 2 and the grinding zone 111 through ingenious 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 the reliability of the equipment.

[0082] Usage: Coal falls into the grinding bowl 11. Since the bottom of the grinding bowl 11 is a hemispherical protrusion 112, the coal falling into the hemispherical protrusion 112 will slide evenly along its arc surface into the material distribution belt 113 area. 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 material distribution belt 113 area to be spun into the grinding zone 111. The coal in the grinding zone 111 is crushed by the crushing gap between the grinding rollers 2 and becomes coal powder.

[0083] When the wear gap between the grinding roller 2 and the grinding zone 111 increases, the drive 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, causing the slider 343 to move horizontally along the movable groove. At the same time, it will exert an upward lifting force through the lifting rod 345. The lifting force drives the bottom of the fixed rod to rotate upward against the U-shaped groove, ultimately realizing the reverse adjustment of the grinding roller 2, making it horizontal with the inclined surface of the grinding zone 111, ensuring the consistency of the crushing gap and improving the coal grinding effect.

[0084] As an optional embodiment:

[0085] Referring to FIG4, in one embodiment provided in this application, a reinforcing member is provided between the lifting rod 345 and the crossbar 341;

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

[0087] Specifically, the reinforcing component includes a triangular plate, which is fixed to the bottom of the crossbar 341. The surface of the triangular plate has a strip-shaped groove, the direction of which is consistent with the inclination direction of the lifting rod 345. A triangular support block is provided inside the strip-shaped groove. A bearing rod is provided through the middle section of the lifting rod 345. The bearing rod passes through the strip-shaped groove and is supported on the flat end of the triangular support block. This can reduce the tension on the lifting rod 345, avoid the problem of loosening at the connection due to vibration, and extend the service life of the equipment.

[0088] As an optional embodiment:

[0089] Referring to FIG5, in one embodiment provided in this application, a plurality of arc-shaped grinding protrusions are equidistantly arranged on the surface of the grinding zone 111, and the gap between two adjacent grinding protrusions forms a channel for the pulverized coal powder to be swirl out after grinding.

[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 several conical protrusions, which can increase the grinding force and make the coal block break faster. The swirling channel allows the ground coal powder to swirl along its direction to the air outlet for discharge, making coal powder discharge more convenient and avoiding the problem of poor material discharge.

[0092] As an optional embodiment:

[0093] Referring to FIG7, in one embodiment provided in this application, a coal mill includes a coal milling structure as described above.

[0094] This invention effectively solves the problem of increased gap caused by wear between the grinding roller and the grinding disc through a unique grinding bowl design and adjustment mechanism. It enables parallel adjustment of the grinding roller and the grinding zone, ensuring the consistency of the crushing 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 noted 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 as long as they do not depart from the scope of the present invention.

Claims

1. A coal grinding structure, characterized in that: include, The grinding base (1) includes a grinding bowl (11) with a conical grinding area (111) on the inside; a grinding roller (2) is arranged parallel to the grinding area (111), and the distance between them is the crushing gap; the adjustment part (3) has a rotating end (31) and a driving end (32); the bottom end of the rotating end (31) has a rotating seat (33), and the driving end (32) applies a vertically downward force to the rotating end (31). The vertically downward force is restricted by the rotating seat (33), so that the rotating end (31) rotates around the rotating seat (33) as a fulcrum, thereby moving the grinding roller (2) closer to / away from the grinding area (111) and completing the adjustment of the crushing gap; the adjustment Part (3) also includes a lifting assembly (34); the lifting assembly (34) provides 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); the lifting assembly (34) includes a horizontal bar (341) and a connector (342) arranged in the horizontal direction; the connector (342) is used to connect the rotating end (31) and the grinding roller (2); a horizontally sliding slider (343) is provided on the horizontal bar (341), and the slider (343) is connected to the driving end (32) and the connector (342) respectively through a pressure rod (344) and a lifting rod (345).

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

3. The coal grinding structure according to claim 2, characterized in that: The inner bottom of the grinding bowl (11) has a hemispherical protrusion (112), and a material distribution zone (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 zone (111) is provided with several arc-shaped grinding protrusions at equal intervals, and the gap between two adjacent grinding protrusions forms a channel for the pulverized coal to be spun out after grinding.

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 pressure rod (344) is used to convert the vertical force of the drive end (32) into the horizontal force, so as to realize the horizontal displacement of the slider (343) on the crossbar (341); when the slider (343) moves horizontally along the crossbar (341), the lifting rod (345) gives the connector (342) an upward force, so as to realize the angle adjustment of the grinding roller (2) at the end of the connector (342).

7. The coal grinding structure according to claim 6, characterized in that: A reinforcing member is provided between the lifting rod (345) and the crossbar (341); the reinforcing member is used to share the lifting force of the lifting rod (345).

8. A coal mill, characterized in that: It includes the coal grinding structure as described in any one of claims 1-7.

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