Grinding disc and fine grinder having the same

Abstract

This invention provides a grinding disc and a fine grinding mill having the same. The grinding disc includes: a shaft hole, the axis of which coincides with the axis of the grinding disc; a first hole group, including a plurality of first material leakage holes, which are arranged annularly at intervals on the outer periphery of the shaft hole, with the axes of the first material leakage holes forming an angle with the axis of the grinding disc; and a second hole group, including a plurality of second material leakage holes, which are arranged annularly at intervals on the outer periphery of the first hole group, with the axes of the second material leakage holes forming an angle with the axis of the grinding disc; wherein the flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group. Applying the technical solution of this application can solve the problem of poor grinding efficiency in existing fine grinding mills.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, and more specifically, to a grinding disc and a fine grinding mill having the same. Background Technology

[0002] Coal-water slurry is a mixture of coal, water, and chemical additives in a certain proportion. It has good fluidity and stability and can be used as a clean fuel with high efficiency and low pollution. It can also be used as a gasification feedstock in the coal chemical industry. Increasing the concentration of coal-water slurry can improve fuel combustion efficiency.

[0003] In the preparation process of coal-water slurry, grinding is required using a fine grinding mill. The fine grinding mill has multiple grinding discs spaced apart, and the surface of each disc has a grinding structure. The material to be ground enters between adjacent grinding discs and undergoes centrifugal motion, thus grinding the slurry through the grinding structure. In existing technology, the flow rate of the coal-water slurry between the grinding discs is inefficient, resulting in poor circulation of the solid components within the slurry. This leads to a significant time consumption and low grinding efficiency. Summary of the Invention

[0004] This invention provides a grinding disc and a fine grinding mill having the same, to solve the problem of poor grinding efficiency in existing fine grinding mills.

[0005] According to one aspect of the present invention, a grinding disc is provided, comprising: a shaft hole, the axis of which coincides with the axis of the grinding disc; a first hole group, the first hole group comprising a plurality of first material leakage holes, the plurality of first material leakage holes being arranged annularly at intervals on the outer periphery of the shaft hole, the axes of the first material leakage holes forming an angle with the axis of the grinding disc; and a second hole group, the second hole group comprising a plurality of second material leakage holes, the plurality of second material leakage holes being arranged annularly at intervals on the outer periphery of the first hole group, the axes of the second material leakage holes forming an angle with the axis of the grinding disc; wherein the flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group.

[0006] Furthermore, the axis of the first discharge hole and the axis of the grinding disc have a first included angle α, the angle of the first included angle α being between 5° and 25°, and the axis of the second discharge hole and the axis of the grinding disc have a second included angle β, the angle of the second included angle β being between 5° and 25°.

[0007] Furthermore, the flow area of ​​the first perforation group is equal to the flow area of ​​the second perforation group.

[0008] Furthermore, the flow area of ​​the first material leakage hole is larger than that of the second material leakage hole, and the number of the first material leakage holes is less than the number of the second material leakage holes.

[0009] Furthermore, a partition ring is formed on the outer periphery of the first hole group. The first hole group and the second hole group are arranged opposite each other on both sides of the partition ring. The grinding disc is divided into a first part and a second part by the partition ring. The first part is located inside the partition ring, and the second part is located outside the partition ring. The weight of the first part is equal to the weight of the second part.

[0010] Furthermore, the angle of the first included angle α is equal to the angle of the second included angle β.

[0011] Furthermore, the grinding disc also includes a plurality of third discharge holes, the extension direction of the axis of the third discharge holes being the same as the extension direction of the axis of the grinding disc, and the third discharge holes being disposed between two adjacent first discharge holes, and / or between two adjacent second discharge holes.

[0012] Furthermore, along the radial direction of the grinding disc, each first discharge hole is provided with at least one second discharge hole.

[0013] According to another aspect of the present invention, a fine grinding mill is provided, comprising: a housing; a grinding assembly, the grinding assembly including a drive member, a transmission shaft and a plurality of grinding discs, the grinding discs being the aforementioned grinding discs, the transmission shaft and the grinding discs being disposed within the housing, the plurality of grinding discs being sleeved on the transmission shaft through shaft holes, the plurality of grinding discs being spaced apart along the axial direction of the transmission shaft, one end of the transmission shaft extending out of the housing and being drivenly connected to the drive member.

[0014] Furthermore, the spacing between each grinding disc is equal, and two adjacent grinding discs are symmetrically arranged along a plane perpendicular to the axis of the drive shaft.

[0015] The technical solution of the invention includes a grinding disc comprising a shaft hole, a first group of holes, and a second group of holes. The shaft hole is used to cooperate with a drive component to drive the grinding disc to rotate. Solid substances in the slurry undergo centrifugal motion away from the axis on the surface of the grinding disc, i.e., flowing from the first group of holes to the second group of holes. The first and second discharge holes are arranged in opposite directions so that the flow direction of the slurry when flowing through the first group of holes is opposite to that when flowing through the second group of holes. When the slurry flows through the first group of holes, it is acted upon by the first group of holes to flow through the first discharge hole, and then flows through the grinding disc again under the action of the second discharge hole. This forces the slurry to circulate around the grinding disc during centrifugal motion, thereby improving the flow efficiency of the slurry and thus improving the grinding efficiency of the grinding disc, resulting in more thorough grinding of the coal-water slurry and better performance. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1A schematic diagram of the structure of the grinding disc provided by the present invention is shown;

[0018] Figure 2 A front view of the grinding disc provided by the present invention is shown;

[0019] Figure 3 A partial cross-sectional view of the grinding disc provided by the present invention at a section of the first reference plane is shown;

[0020] Figure 4 A partial cross-sectional view of the grinding disk provided by the present invention at a section of the second reference plane is shown;

[0021] Figure 5 This is a front view of the grinding disc provided by the present invention when it is provided with a third material leakage hole;

[0022] Figure 6 A partial cross-sectional view of the fine grinding mill provided by the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Shaft hole;

[0025] 20. First material leakage hole;

[0026] 30. Second material leakage hole;

[0027] 40. Third material leakage hole;

[0028] 100, housing; 200, drive shaft; 01, separator ring. Detailed Implementation

[0029] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 2As shown, this embodiment of the invention provides a grinding disc, which includes a shaft hole 10, a first group of holes, and a second group of holes. The axis of the shaft hole 10 coincides with the axis of the grinding disc. The first group of holes includes a plurality of first discharge holes 20, which are arranged annularly at intervals on the outer periphery of the shaft hole 10, and the axes of the first discharge holes 20 and the axis of the grinding disc form an angle. The second group of holes includes a plurality of second discharge holes 30, which are arranged annularly at intervals on the outer periphery of the first group of holes, and the axes of the second discharge holes 30 and the axis of the grinding disc form an angle. The flow direction of the slurry through the first group of holes is opposite to the flow direction through the second group of holes.

[0031] It should be noted that, in the radial direction of the grinding disc, the plane orthogonal to the line connecting the center of the first discharge hole 20 and the axis of the grinding disc, and passing through the first discharge hole 20, is the first reference plane. In this application, "the axis of the first discharge hole 20 and the axis of the grinding disc have an angle" can be understood as the grinding disc at the tangent of the first reference plane, with reference to... Figure 3 As shown, the two sidewalls of the first material discharge hole 20 form an angle with the axis of the grinding disk, that is, the first material discharge hole 20 is inclined. The plane orthogonal to the line connecting the center of the second material discharge hole 30 and the axis of the grinding disk, and passing through the second material discharge hole 30, is the second reference plane. In this application, "the axis of the second material discharge hole 30 forms an angle with the axis of the grinding disk" can be understood as the grinding disk at the tangent of the second reference plane, with reference to... Figure 4 As shown, the two sidewalls of the second discharge hole 30 form an angle with the axis of the grinding disc, that is, the second discharge hole 30 is inclined. When the grinding disc rotates in the fine grinding mill, because the multiple first discharge holes 20 of the first hole group are inclined, the sidewalls of the first discharge holes 20 will push the slurry in the fine grinding mill to flow through the first discharge holes 20. Similarly, the sidewalls of the second discharge holes 30 will push the slurry in the fine grinding mill to flow through the second discharge holes 30.

[0032] In this application, the inclination direction of any first discharge hole 20 on the same side of the radial tangent of the grinding disc is opposite to the inclination direction of any second discharge hole 30 along the center line perpendicular to the radial tangent. That is, the first discharge hole 20 and the second discharge hole 30 are arranged in opposite directions. With this arrangement, the flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group.

[0033] According to the technical solution of this invention, the grinding disc includes a shaft hole 10, a first hole group, and a second hole group. The shaft hole 10 is used to cooperate with the drive shaft 200 to drive the grinding disc to rotate. The solid substances in the slurry undergo centrifugal motion away from the axis on the surface of the grinding disc, that is, they flow from the first hole group to the second hole group. The first discharge hole 20 and the second discharge hole 30 are arranged in opposite directions so that the flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group. When the slurry flows through the first hole group, it can be affected by the first hole group and flow through the first discharge hole 20, and then flow through the grinding disc again under the action of the second discharge hole 30. This forces the slurry to circulate around the grinding disc during the centrifugal motion, thereby improving the flow efficiency of the slurry and thus improving the grinding efficiency of the grinding disc, making the coal-water slurry grinding more thorough and achieving better results.

[0034] Specifically, in this application, the axis of the first discharge hole 20 and the axis of the grinding disc have a first included angle α, which is between 5° and 25°. If α is less than 5°, the driving effect of the first discharge hole 20 on the slurry is poor, and it cannot effectively improve the material flow efficiency. If α is greater than 25°, although the driving effect of the first discharge hole 20 on the slurry is better, and it can effectively improve the material flow efficiency at a single grinding disc, when it cooperates with the second discharge hole 30, more slurry will participate in the circulation, affecting the flow of slurry between multiple grinding discs. In this application, by setting the angle of the first included angle α between 5° and 25°, it is possible to ensure that the slurry has a good circulation effect when flowing through the first discharge hole 20 and the second discharge hole 30, while also ensuring the flow effect of the slurry between multiple grinding discs. Specifically, α can be 5°, 15°, 20°, or 25°.

[0035] Furthermore, the axis of the second discharge hole 30 has a second included angle β with the axis of the grinding disc, and the angle of the second included angle β is between 5° and 25°. Similarly, the first discharge hole 20 and the second discharge hole 30, by setting the angle of the second included angle β between 5° and 25°, can ensure that the slurry has a good circulation effect when flowing through the first discharge hole 20 and the second discharge hole 30, while also ensuring the flow effect of the slurry among multiple grinding discs. Specifically, β can be 5°, 15°, 20° or 25°.

[0036] In a specific embodiment of this application, the angle α of the first included angle is equal to the angle β of the second included angle. With the above arrangement, the flow rate of the slurry through the first orifice group is equal to the flow rate of the slurry through the second orifice group. This ensures that the pressure exerted on the grinding disc by the slurry on both sides of the grinding disc is balanced when the slurry flows through and circulates, thus ensuring equal axial force on the grinding disc and preventing abnormal vibration of the grinding disc.

[0037] In one specific embodiment of this application, the flow area of ​​the first orifice group is equal to the flow area of ​​the second orifice group. When the flow rates of the slurry through the first and second orifice groups are mismatched, the maximum flow rate of the slurry circulating between the first and second orifice groups is the smaller of the flow rates of the first and second orifice groups. The difference between the flow rates of the first and second orifice groups will not participate in the circulation, thus wasting the area of ​​the grinding structure on the surface of the grinding disc and affecting the grinding effect of the grinding disc. The flow rate of the slurry through the first orifice group is equal to the flow rate of the slurry through the second orifice group, so as to ensure that the flow rates of the slurry through the first and second orifice groups are matched, thereby improving the grinding efficiency and grinding effect of the grinding disc.

[0038] Specifically, the flow area of ​​the first discharge hole 20 is larger than that of the second discharge hole 30, and the number of first discharge holes 20 is less than the number of second discharge holes 30. The first discharge hole 20 is located in the inner ring of the second discharge hole 30. Since the radial width of the outer ring area is narrow, the opening area of ​​the second discharge hole 30 is limited. In this application, by setting the flow area of ​​the first discharge hole 20 to be larger than that of the second discharge hole 30, and setting the number of first discharge holes 20 to be less than the number of second discharge holes 30, the areas of the first hole group and the second hole group can be balanced to balance the flow rate of the slurry flowing through the first hole group and the second hole group, thus ensuring the grinding efficiency of the grinding disc.

[0039] In this application, a partition ring 01 is formed on the outer periphery of the first hole group. The first hole group and the second hole group are arranged opposite each other on both sides of the partition ring 01. The grinding disc is divided into a first part and a second part by the partition ring 01. The first part is located inside the partition ring 01, and the second part is located outside the partition ring 01. The weight of the first part is equal to the weight of the second part. Through the above arrangement, the overall structural strength of the grinding disc can be guaranteed, and the grinding disc will not vibrate when subjected to bidirectional slurry pressure, thereby improving the stability of the grinding disc rotation and ensuring the grinding effect of the grinding disc.

[0040] In a specific embodiment of this application, the grinding disc further includes a plurality of third discharge holes 40. The extension direction of the axis of the third discharge hole 40 is the same as the extension direction of the axis of the grinding disc. The third discharge hole 40 is disposed between two adjacent first discharge holes 20. By setting the third discharge hole 40, the flow rate of the slurry on the grinding disc can be adjusted, and the flow rates of the first hole group and the second hole group can be balanced. The specific number of third discharge holes 40 can be set according to the usage requirements of the fine grinding mill, as long as the third discharge hole 40 and the first discharge hole 20 are spaced apart, and the pressure of the slurry on the surface of the grinding disc in the axial direction is the same.

[0041] Alternatively, in other feasible embodiments of this application, a plurality of third discharge holes 40 may also be disposed between two adjacent second discharge holes 30.

[0042] Optionally, in some other embodiments of this application, reference is made to... Figure 5 As shown, both the first hole group and the second hole group are provided with a third material leakage hole 40, that is, the third material leakage hole 40 is simultaneously provided between two adjacent first material leakage holes 20 and between two adjacent second material leakage holes 30.

[0043] Furthermore, along the radial direction of the grinding disc, each first discharge hole 20 is correspondingly provided with at least one second discharge hole 30. Since the first hole group and the second hole group guide the slurry fluid in opposite directions, the slurry can flow between the first discharge hole 20 and the second discharge hole 30. When the grinding disc rotates at high speed, the first discharge hole 20 will circulate the slurry with the nearby second discharge hole 30. Through the above arrangement, the flow path of the slurry can be shortened, and the circulation rate of the slurry can be further improved.

[0044] In the preferred embodiment of this application, the first material leakage hole 20 in the first hole group and the second material leakage hole 30 in the second hole group can be set to an odd number, such as 3, 5, 7 or 9, etc., to reduce the resonance caused by the symmetry of the grinding disc when the first material leakage hole 20 or the second material leakage hole 30 is set to an even number, reduce the noise of the grinding operation, and ensure the stable rotation of the grinding disc.

[0045] Specifically, in this application, the first discharge hole 20 and the second discharge hole 30 can be circular holes to facilitate the processing of the grinding disc.

[0046] Specifically, in this application, the projection shape of the first discharge hole 20 on a plane orthogonal to the grinding disc axis can have a tapered section, that is, in the tapered section, the width of the first discharge hole 20 gradually decreases in the axial direction away from the grinding disc. With this configuration, when the material flows through the first discharge hole 20, the centrifugal force of the material can be increased, which allows the material to move further in the radial direction, increasing the distance the material is ground and thus enabling the material to be ground more thoroughly.

[0047] Similarly, the second discharge hole 30 can also have a tapered section in its projection shape along a plane orthogonal to the grinding disc axis. The tapered section of the second discharge hole 30 is arranged in the opposite direction to the tapered section of the first discharge hole 20, that is, the width of the second discharge hole 30 gradually increases in the axial direction away from the grinding disc. This arrangement can increase the efficiency of slurry circulation between the first and second hole groups, thereby improving the grinding efficiency of the grinding disc.

[0048] like Figure 6As shown, an embodiment of this application also provides a fine grinding mill, which includes a housing 100 and a grinding assembly. The grinding assembly includes a drive component, a transmission shaft 200, and multiple grinding discs. The grinding discs are the aforementioned grinding discs. Both the transmission shaft 200 and the grinding discs are disposed within the housing 100. The multiple grinding discs are sleeved on the transmission shaft 200 through shaft holes 10. The multiple grinding discs are spaced apart along the axial direction of the transmission shaft 200. One end of the transmission shaft 200 extends out of the housing 100 and is drivenly connected to the drive component.

[0049] Specifically, when the drive unit drives the transmission shaft 200 to rotate, multiple grinding discs can rotate under the drive of the transmission shaft 200. By applying the above-mentioned grinding discs in the fine grinding mill provided in this application, the slurry can circulate around the grinding discs, thereby further improving the grinding efficiency of the fine grinding mill, making the slurry grinding more thorough, and achieving better results.

[0050] Specifically, the number of grinding discs can be selected according to the capacity and grinding efficiency of the fine grinder, such as 6 or more.

[0051] Furthermore, the spacing between each grinding disc is equal, and adjacent grinding discs are symmetrically arranged along a plane perpendicular to the axis of the drive shaft 200. This allows convection of the grinding media between adjacent grinding discs. For example, the slurry can flow out from the first discharge hole 20, flow radially along the grinding disc, and then flow out from the second discharge hole 30; or, the slurry can flow out from the second discharge hole 30, flow radially along the grinding disc, and then flow out from the first discharge hole 20. This arrangement creates localized convection of the slurry between adjacent grinding discs, further improving the grinding efficiency of the grinding discs.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A grinding disc, characterized in that, The grinding disc includes: Shaft hole (10), the axis of which coincides with the axis of the grinding disc; The first hole group includes a plurality of first discharge holes (20), which are arranged circumferentially at intervals on the outer periphery of the shaft hole (10), and the axis of the first discharge hole (20) has a first included angle α with the axis of the grinding disc; The second hole group includes a plurality of second discharge holes (30), which are arranged circumferentially at intervals on the outer periphery of the first hole group. The axis of the second discharge hole (30) has a second included angle β with the axis of the grinding disc. The flow direction of the slurry when it flows through the first group of holes is opposite to the flow direction when it flows through the second group of holes; The inclination direction of any of the first discharge holes (20) on the same side of the radial tangent of the grinding disc is opposite to the inclination direction of any of the second discharge holes (30) along the centerline perpendicular to the radial tangent; The flow area of ​​the first aperture group is equal to the flow area of ​​the second aperture group; A partition ring (01) is formed on the outer periphery of the first hole group. The first hole group and the second hole group are arranged opposite to each other on both sides of the partition ring (01). The grinding disc is divided into a first part and a second part through the partition ring (01). The first part is located inside the partition ring (01), and the second part is located outside the partition ring (01). The weight of the first part is equal to the weight of the second part. The angle of the first included angle α is between 5° and 25°, and the angle of the second included angle β is between 5° and 25°; The angle of the first included angle α is equal to the angle of the second included angle β.

2. The grinding disc according to claim 1, characterized in that, The flow area of ​​the first material leakage hole (20) is greater than the flow area of ​​the second material leakage hole (30), and the number of the first material leakage holes (20) is less than the number of the second material leakage holes (30).

3. The grinding disc according to claim 1, characterized in that, The grinding disc also includes a plurality of third material leakage holes (40), the extension direction of the axis of the third material leakage hole (40) is the same as the extension direction of the axis of the grinding disc, and the third material leakage hole (40) is disposed between two adjacent first material leakage holes (20) and / or between two adjacent second material leakage holes (30).

4. The grinding disc according to claim 3, characterized in that, Along the radial direction of the grinding disc, each of the first discharge holes (20) is provided with at least one second discharge hole (30).

5. A fine grinding mill, characterized in that, The fine grinding mill includes: Casing (100); A grinding assembly, comprising a drive component, a transmission shaft (200), and a plurality of grinding discs, wherein the grinding discs are the grinding discs as described in any one of claims 1 to 4, the transmission shaft (200) and the grinding discs are both disposed within the housing (100), the plurality of grinding discs are all sleeved on the transmission shaft (200) through shaft holes (10), the plurality of grinding discs are spaced apart along the axial direction of the transmission shaft (200), and one end of the transmission shaft (200) extends out of the housing (100) and is drivenly connected to the drive component.

6. The fine grinding mill according to claim 5, characterized in that, The spacing between each of the grinding discs is equal, and two adjacent grinding discs are symmetrically arranged along a plane perpendicular to the axis of the drive shaft (200).

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