Pulverized coal screening device

Abstract

The utility model provides a pulverized coal screening device which comprises a base mechanism, a screening mechanism and a screening mechanism, the base mechanism comprises a base structure and a rotating stand structure, and the rotating stand structure is rotatably arranged in an inner cavity of the base structure; the screening mechanism comprises a top cover structure used for being connected with an external mechanical rotating source and at least two screening structures used for screening pulverized coal in a centrifugal rotating mode. The screening structures are arranged on the inner side of the rotating stand structure, the top cover structure is detachably connected with and covers the upper end openings of the rotating stand structure and the screening structures, all the screening structures are sequentially arranged in a sleeving mode from inside to outside, and screening holes are formed in all the screening structures. And the aperture size of the screening holes of the screening structure located on the outer side in the radial direction is smaller than that of the screening holes of the screening structure located on the inner side in the radial direction, and the problem that the screening efficiency of the pulverized coal screening device is low is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-using equipment, in particular to a coal powder screening device. Background Art

[0002] The description in this section merely provides background information related to the disclosure of the present utility model and does not constitute prior art.

[0003] In the field of coal equipment technology, pulverized coal usually needs to be ground. The particle size of the ground pulverized coal is an important indicator for measuring the coarseness and fineness of the coal particles after grinding in the coal mill. The pulverized coal particle size usually refers to the content (percentage) of pulverized coal of a certain particle size in the overall pulverized coal. It is usually measured using a sieve. Under the premise that the sieve aperture is set according to a certain particle size, the more pulverized coal remains on the sieve, the greater the content of pulverized coal of that particle size in the overall pulverized coal. The uniformity of pulverized coal particle size is crucial for stable combustion in boilers. The closer the pulverized coal particle size matches the type of coal used in the boiler, the higher the uniformity of the pulverized coal particle size, and the better the economy of boiler combustion. Therefore, in the existing technical process, the pulverized coal particle size is usually measured.

[0004] In the process of measuring the particle size of coal powder, the vibration screening method is usually used for screening and measuring the particle size. Multiple screens are usually arranged at intervals from top to bottom, and the screen holes of each screen are gradually smaller from top to bottom. The coal powder is put into the top of the screen. Under the action of up and down vibration, the particles smaller than the screen holes pass through and enter the next level of screen. After a long period of vibration, the coal powder remaining on each level of the screen is weighed and measured to obtain the coal powder particle size distribution. However, the mechanical vibration method is used for coal powder particle size measurement, the screening time is too long, and the whole equipment is heavy and difficult to move, requiring a dedicated screening equipment site for arrangement and measurement. In another technology, air can also be used. In the flow screening method, a nozzle is set under the screen. The airflow ejected from the nozzle fluidizes the particles on the screen. The airflow generated by the negative pressure device can carry the particles through the screen, and the coarse particles are retained on the screen, while the fine particles pass through. However, due to the fluidization effect of the airflow, the airflow screening method can only place a screen of one particle size in one screening process. If you want to obtain the particle size distribution of coal powder, you need to place the powder remaining on the previous screen on a coarser screen and measure it again. Therefore, the measurement process is complicated and the efficiency is low. In addition, the use of a negative pressure device requires a specially set up site for measurement of the airflow screening method, which requires a dedicated power supply scenario and is difficult to move the equipment.

[0005] It should be noted that the above technical background is merely for the purpose of providing a clear and complete description of the technical solutions of the present invention and to facilitate understanding by those skilled in the art. It should not be assumed that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present invention. Utility Model Content

[0006] The utility model aims to provide a coal powder screening device, which solves the problem of low screening efficiency of the existing coal powder screening device.

[0007] The above-mentioned implementation objectives of the present invention are mainly achieved by the following technical solutions:

[0008] The utility model provides a coal powder screening device, comprising:

[0009] The base mechanism comprises a base structure and a rotating frame structure, wherein the rotating frame structure is rotatably disposed in an inner cavity of the base structure;

[0010] A screening mechanism comprising a top cover structure for connecting to an external mechanical rotation source and at least two screening structures for centrifugally rotating and screening the coal powder;

[0011] The screening structure is arranged on the inner side of the rotating frame structure, and the top cover structure is detachably connected and covers the upper end openings of the rotating frame structure and the screening structure. Each of the screening structures is sequentially arranged from the inside to the outside, and each of the screening structures is provided with sieve holes, and the aperture size of the sieve holes of the screening structure located radially outside is smaller than the aperture size of the sieve holes of the screening structure located radially inside.

[0012] In a specific embodiment, a driving block for connecting to an external mechanical rotation source is protruded upward from the upper end of the top cover structure, and the driving block can drive the turntable structure and the screening structure to rotate around the rotation axis of the turntable structure through the top cover structure.

[0013] In a specific embodiment, the rotation axis of the screening structure is collinear with the rotation axis of the turret structure and is arranged in a vertical direction.

[0014] In a specific embodiment, the driving block is arranged to extend vertically upward along the rotation axis of the screening structure, and the driving block has a clamping portion.

[0015] In a specific embodiment, the rotating frame structure includes a base plate, a plurality of brackets, and a bearing structure;

[0016] The bearing structure is rotatably arranged on the inner bottom wall of the base structure along the axis of the rotating frame structure, and the rotating end of the bearing structure is connected to the center of the bottom plate;

[0017] The plurality of brackets are arranged at intervals along the periphery of the bottom plate, the lower ends of the plurality of brackets are connected to the bottom plate, and the upper ends of the plurality of brackets are sequentially connected to the screening structure and the top cover structure.

[0018] In a specific embodiment, the rotating frame structure further includes:

[0019] A fixed ring belt is arranged around the circumference of the base plate, and the lower end of the fixed ring belt is connected to the upper ends of the multiple brackets.

[0020] In a specific embodiment, the top cover structure is provided with a plurality of first fixing holes, and the upper end of the fixing ring band is protruded with a plurality of fixing members, and the fixing members are detachably inserted into the first fixing holes.

[0021] In a specific embodiment, a screening ring belt is protruded radially outward from the upper end of the screening structure, and a plurality of second fixing holes are opened on the screening ring belt. The fixing members are sequentially inserted into the second fixing holes and the first fixing holes.

[0022] In a specific embodiment, there is a gap between two adjacent screening structures from the inside to the outside, and the gap is greater than or equal to 20 mm.

[0023] In a specific embodiment, a first inclined surface is formed on the bottom of the screening structure and is arranged around the rotation axis of the screening structure. The radial distal end of the first inclined surface is higher than the radial proximal end of the first inclined surface.

[0024] In a specific embodiment, the first inclined surface forms a first angle with the horizontal plane, and the first angle is 20° to 40°.

[0025] In a specific embodiment, the bottom of the screening structure is further formed with a second inclined surface and a deposition surface arranged around the rotation axis of the screening structure;

[0026] The second inclined surface, the deposition surface, and the first inclined surface are arranged radially outward in sequence from the bottom center of the screening structure; the second inclined surface forms a second angle with the horizontal plane, and the deposition surface is parallel to the horizontal plane.

[0027] In a specific embodiment, the radial proximal end of the second inclined surface is higher than the radial distal end of the second inclined surface, and the second included angle is 70° to 80°.

[0028] Compared with the prior art, the technical solution described in this utility model has the following characteristics and advantages:

[0029] The coal powder screening device provided by the utility model is used to provide a rotating space for the screening structure to rotate and screen by setting an inner cavity of a base structure, wherein the rotating frame structure is rotatably arranged in the base structure, so that the screening structure can rotate in the inner cavity of the base structure through the rotating frame structure, and at the same time, the coal powder leaked from the screening structure can fall into the inner cavity of the base structure, thereby preventing the leaked coal powder from polluting the environment and ensuring the cleanliness of the screening operation environment; the screening structure can rotate with the rotating frame structure, thereby achieving the effect of centrifugal rotary screening of coal powder; the screening mechanism includes screening structures that are sequentially arranged from the inside to the outside, and the aperture size of the screen holes of the screening structure located radially outside is smaller than the aperture size of the screen holes of the screening structure located radially inside, so that coal powder of different particle sizes can stay in the screening structures with corresponding different screen hole aperture sizes during the centrifugal rotary screening process, thereby achieving coal powder particle size distinction; after the centrifugal rotary screening process, each screening structure is disassembled, and the screen holes remaining in the screen holes with different screen hole aperture sizes are counted. The percentage of coal powder on the test structure in the entire experimental coal powder can be used to obtain the particle size distribution of the experimental coal powder; the cover structure is detachably covered at the upper end openings of the rotating frame structure and the screening structure to seal the upper end openings of the screening structure and the rotating frame structure, so as to prevent the experimental coal powder from being thrown out from the opening of the screening structure during centrifugal rotation, resulting in inaccurate content data; the cover structure connects the rotating frame structure and the screening structure, and the cover structure can be connected to an external mechanical rotation source, so that the cover structure can be rotated by the external mechanical rotation source, and the external mechanical rotation source can also drive the rotating frame structure and the screening structure to rotate in the inner cavity of the base structure through the cover structure to achieve the effect of centrifugal screening. Compared with the large volume and special drive structure of the existing screening device, the coal powder screening device provided by the utility model can be easily and quickly arranged in any place, and rotary screening can be achieved by using any external mechanical rotation source. It is not limited to a special drive device, making it more easy to use and more applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of the coal powder screening device of the present utility model;

[0031] Figure 2 This is a structural diagram of the base mechanism of the pulverized coal screening device of the present invention;

[0032] Figure 3 This is a top view of the base mechanism of the pulverized coal screening device of the present invention;

[0033] Figure 4 This is an enlarged partial view of the connection between the base mechanism and the screening mechanism of the pulverized coal screening device of the present invention;

[0034] Figure 5 This is a structural diagram of the top cover structure of the coal powder screening device of the present utility model;

[0035] Figure 6 This is a top view of the top cover structure of the coal powder screening device of the present invention;

[0036] Figure 7 This is a structural diagram of a first embodiment of the screening structure of a pulverized coal screening device of the present invention;

[0037] Figure 8 This is a structural diagram of a second embodiment of the screening structure of the pulverized coal screening device of the present invention.

[0038] Description of Figure Numbers:

[0039] 1. Base mechanism; 11. Base structure; 12. Rotating frame structure; 121. Bottom plate; 122. Bracket; 123. Bearing structure; 124. Fixed ring belt; 1241. Fixing parts;

[0040] 2. Screening mechanism; 21. Top cover structure; 211. Driving block; 212. First fixing hole; 22. Screening structure; 221. Screen hole; 222. Screening belt; 2221. Second fixing hole; 223. First inclined surface; 224. Second inclined surface; 225. Deposition surface;

[0041] 31. First sealing rubber ring; 32. First rubber ring fixing plate;

[0042] 41. Second sealing rubber ring; 42. Second rubber ring fixing plate;

[0043] D1, first angle;

[0044] D2, second angle;

[0045] A. The rotation axis of the turret structure;

[0046] B. The axis of rotation of the screening structure. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0048] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] like Figures 1 to 3 As shown, the utility model provides a coal powder screening device, comprising:

[0051] The base mechanism 1 comprises a base structure 11 and a rotating frame structure 12, wherein the rotating frame structure 12 is rotatably disposed in the inner cavity of the base structure 11;

[0052] The screening mechanism 2 comprises a top cover structure 21 for connecting to an external mechanical rotation source and at least two screening structures 22 for centrifugal rotation screening of coal powder;

[0053] The screening structure 22 is arranged on the inner side of the rotating frame structure 12, and the top cover structure 21 is detachably connected and covers the upper end openings of the rotating frame structure 12 and the screening structure 22. The screening structures 22 are sequentially arranged from the inside to the outside, and each screening structure 22 is provided with a sieve hole 221, and the aperture size of the sieve hole 221 of the screening structure 22 located on the radial outside is smaller than the aperture size of the sieve hole 221 of the screening structure 22 located on the radial inside.

[0054] The coal powder screening device provided by the present invention provides a rotation space for the screening structure 22 to rotate and screen by setting the inner cavity of the base structure 11, wherein the turret structure 12 is rotatably arranged in the base structure 11, so that the screening structure 22 can rotate in the inner cavity of the base structure 11 through the turret structure 12, and the coal powder leaked from the screening structure 22 can fall into the inner cavity of the base structure 11, thereby preventing the leaked coal powder from polluting the environment and ensuring a clean screening operation environment; the screening structure 22 can rotate along with the turret structure 12, Thus, the effect of centrifugal rotary screening of coal powder is achieved; the screening mechanism 2 includes screening structures 22 arranged in sequence from the inside to the outside, and the aperture size of the screen holes 221 of the screening structure 22 located on the radial outside is smaller than the aperture size of the screen holes 221 of the screening structure 22 located on the radial inside, so that coal powder of different particle sizes can stay in the screening structures 22 with corresponding different aperture sizes of the screen holes 221 during the centrifugal rotary screening process, thereby achieving coal powder particle size differentiation; after the centrifugal rotary screening process, each screening structure 22 is disassembled, and the particles remaining in each different particle size are counted. The percentage of coal powder on the screening structure 22 with the same sieve hole 221 aperture size in the entire experimental coal powder can be used to obtain the particle size distribution of the experimental coal powder; the cover structure is detachably covered at the upper end openings of the rotating frame structure 12 and the screening structure 22 to seal the upper end openings of the screening structure 22 and the rotating frame structure 12 to prevent the experimental coal powder from being thrown out from the opening of the screening structure 22 during the centrifugal rotation, resulting in inaccurate content data; the cover structure connects the rotating frame structure 12 and the screening structure 22, and the cover structure can be connected to an external mechanical The rotation source allows the cover structure to be rotated by an external mechanical rotation source, and the external mechanical rotation source can also drive the rotating frame structure 12 and the screening structure 22 to rotate in the inner cavity of the base structure 11 through the cover structure to achieve the effect of centrifugal screening. Compared with the large volume and dedicated driving structure of the existing screening device, the coal powder screening device provided by the utility model can be easily and quickly arranged in any place, and rotary screening can be achieved by using any external mechanical rotation source, without being limited to a dedicated driving device, so that it is easier to use and has a wider applicability.

[0055] Specifically, in this embodiment, the screening mechanism 2 is mounted within the base structure 1. The base structure 11 is generally cylindrical with an open top. The inner cavity of the base structure 11 is generally a cylindrical cavity symmetrical about the centerline of the base structure 11. The turret structure 12 is rotatably mounted within the inner cavity of the base structure 11. In this embodiment, the turret structure 12 can rotate about the centerline of the base structure 11. That is, the centerline of the base structure 11 in this embodiment is colinear with the rotation axis A of the turret structure 12. An installation space with an upper opening is formed on the inner side of the turret structure 12, facilitating the installation of the screening mechanism 22 through the upper opening of the turret structure 12 and inside the turret structure 12. The screening mechanism 22 can rotate with the turret structure 12 about the rotation axis A of the turret structure 12, thereby achieving the effect of centrifugal rotary screening of pulverized coal. In this embodiment, a barrel beam is provided on the outer side of the base structure 11, which is rotatably connected to the base structure 11 so that the barrel beam can be used to lift the base structure 11 to change its installation position. The bottom of the base structure 11 is provided with an anti-slip pad.

[0056] In this embodiment, there are at least two screening structures 22, and at least two screening structures 22 are sequentially sleeved from the inside to the outside and connected to the rotating frame structure 12. There is a certain gap between the two adjacent screening structures 22 inside and outside to accommodate the coal powder that has not passed through the screen holes 221. The screening structure 22 is generally a cylindrical structure with an open top. A plurality of screen holes 221 are spaced apart on the side wall and bottom wall of the screening structure 22. During the rotation of the screening structure 22, the centrifugal force drives the experimental coal powder to move to the side wall of the screening structure 22 and spread out, so that the coal powder can pass through the screen holes 221 of the screening structure 22, thereby avoiding the accumulation of coal powder and the failure of the coal powder that should have been screened to be screened. The aperture size of the sieve hole 221 of the outer screening structure 22 is smaller than the aperture size of the sieve hole 221 of the screening structure 22 located on the radial inner side, that is, in the two adjacent screening structures 22, the aperture size of the sieve hole 221 of the screening structure 22 mounted on the outside is smaller than the aperture size of the sieve hole 221 of the screen structure 22 being mounted. Before the screening process begins, the experimental coal powder is placed in the innermost screening structure 22. During the screening process, the experimental coal powder is centrifugally screened from the innermost screening structure 22 to the outermost screening structure 22 in sequence. Coal powders of different particle sizes are centrifugally screened to the corresponding screening structures 22 to achieve the distinction between coal powders of different particle sizes.

[0057] In this embodiment, a top cover structure 21 is removably mounted over the upper openings of the turret structure 12 and the screening structure 22. The top cover structure 21 can be removed when adding experimental pulverized coal, and can also be sealed during centrifugal screening. The top cover structure 21 of this embodiment connects the turret structure 12 and the screening structure 22. When the top cover structure 21 is connected to an external mechanical rotation source, the external mechanical rotation source can drive the top cover structure 21 to rotate about the rotation axis A of the turret structure 12. During this rotation, the top cover structure 21 can also drive the turret structure 12 and the screening structure 22 to rotate about the rotation axis A of the turret structure 12. The specific structure of the external mechanical rotation source is limited to the ability of the rotating components of the external mechanical rotation source to rotate about the rotation axis A of the turret structure 12.

[0058] like Figure 4 and Figure 5 As shown, in a specific embodiment, a driving block 211 is protruded upward from the upper end of the top cover structure 21 for connecting to an external mechanical rotation source. The driving block 211 can drive the turntable structure 12 and the screening structure 22 to rotate around the rotation axis A of the turntable structure 12 through the top cover structure 21.

[0059] The pulverized coal screening device provided in this embodiment provides a driving block 211 at the upper end of the top cover structure 21, so that an external mechanical rotation source can be directly connected to the driving block 211 and drive the top cover structure 21 to rotate around the rotation axis A of the turret structure 12 through the driving block 211, thereby driving the turret structure 12 and the screening structure 22 to rotate around the rotation axis A of the turret structure 12.

[0060] In this embodiment, the driving block 211 can be set at the rotation center of the top cover structure 21, and the driving block 211 can also be set at the edge of the top cover structure 21. The setting position of the driving block 211 is set at the upper end of the top cover structure 21 according to the rotation mode of the common external mechanical rotation source. There can also be multiple driving blocks 211, and multiple driving blocks 211 can be set at the upper end of the top cover structure 21 at the same time according to the common multiple external mechanical rotation sources, so that the corresponding adaptive driving block 211 can be found in different scenarios.

[0061] like Figure 7 and Figure 8 As shown, in one embodiment, the rotation axis B of the screening structure 22 is collinear with the rotation axis A of the turret structure 12 and is disposed vertically. By arranging the rotation axis B of the screening structure 22 collinear with the rotation axis A of the turret structure 12, the pulverized coal screening device provided in this embodiment is configured such that each portion of the circumferential sidewall of the screening structure 22 is subjected to the same centrifugal force during centrifugal screening, thereby achieving optimal centrifugal screening results.

[0062] like Figure 5 and Figure 6 As shown, in a specific embodiment, the driving block 211 is arranged to extend vertically upward along the rotation axis B of the screening structure 22, and the driving block 211 has a clamping portion.

[0063] The pulverized coal screening device provided in this embodiment arranges the driving block 211 along the rotation axis B of the screening structure 22 and the rotation axis A of the rotating frame structure 12, that is, the driving block 211 of the top cover structure 21 can rotate along its own axis under the drive of an external mechanical rotation source, so that the top cover structure 21 can be connected to a wider range of optional external mechanical rotation sources, that is, only one external mechanical rotation source that can provide self-rotation is required, such as a rotating motor, a hand crank arm, etc.

[0064] Specifically in this embodiment, a rotating mop rod structure can be adopted for the selection of an external mechanical rotation source. The rotating mop rod includes a rotating rod and a rotating disk connected to each other. By pressing the rotating rod downward, the downward pressure can be converted into the rotational force of the rotating disk, thereby driving the rotating disk to rotate. In this embodiment, the rotating disk can be installed on the top cover and connected to the driving block 211. The driving block 211 is provided with a clamping portion. The driving block 211 of this embodiment is a square columnar structure, and the clamping portion is a square columnar edge, so that the rotating disk can be clamped on the clamping portion when it rotates, thereby driving the top cover structure 21 to rotate; during the screening process, pressing the rotating rod downward can drive the top cover structure 21 to rotate through the rotating disk, thereby driving the screening structure 22 and the rotating frame structure 12 to rotate.

[0065] like Figure 2 and Figure 3 As shown, in one embodiment, the rotating frame structure 12 includes a base plate 121, a plurality of brackets 122, and a bearing structure 123;

[0066] The bearing structure 123 is rotatably disposed on the inner bottom wall of the base structure 11 along the axis of the rotating frame structure 12 , and the rotating end of the bearing structure 123 is connected to the center of the bottom plate 121 ;

[0067] The plurality of brackets 122 are spaced apart along the periphery of the bottom plate 121 , the lower ends of the plurality of brackets 122 are connected to the bottom plate 121 , and the upper ends of the plurality of brackets 122 are sequentially connected to the screening structure 22 and the top cover structure 21 .

[0068] Specifically, in this embodiment, the bottom plate 121 is generally a centrally symmetrical circular plate. In other embodiments, the bottom plate 121 can also be a plate of other centrally symmetrical shapes; a plurality of brackets 122 are arranged at intervals along the circumference of the bottom plate 121 on the periphery of the bottom plate 121, and the brackets 122 are arranged in the vertical direction; in this embodiment, the bearing structure 123 is arranged at the center of the base structure 11, and the bearing structure 123 extends along the center line of the base structure 11. The rotating end of the bearing structure 123 is connected to the center of the bottom plate 121, that is, the bottom plate 121 can rotate around the base structure. 11 rotates along the center line; in this embodiment, the bracket 122 is generally "L"-shaped, and the lower end of the bracket 122 is connected to the bottom plate 121, that is, the bracket 122 and the bottom plate 121 are combined to form the inner space of the turret structure 12, which is convenient for placing the screening structure 22 in the central inner space of the turret structure 12; the upper end of the bracket 122 is connected to the screening structure 22 and the top cover structure 21 in sequence, that is, the screening structure 22 can rotate together with the turret structure 12, and the top cover structure 21 can simultaneously drive the turret structure 12 and the screening structure 22 to rotate through the bracket 122.

[0069] like Figure 2 and Figure 3 As shown, in one embodiment, the turret structure 12 further includes:

[0070] The fixing ring belt 124 is disposed around the circumference of the bottom plate 121 , and the lower end of the fixing ring belt 124 is connected to the upper ends of the plurality of brackets 122 .

[0071] The pulverized coal screening device provided in this embodiment ensures the structural rigidity of the overall frame of the turret structure 12 by disposing a fixed annular band 124 at the upper ends of the multiple brackets 122. Specifically, in this embodiment, the fixed annular band 124 is generally annular, and the lower end of the fixed annular band 124 is connected to the upper ends of the multiple brackets 122. This limits radial deformation of the brackets 122 and avoids the problem of easy deformation of the brackets 122 during the screening process. The turret structure 12 in this embodiment adopts a hollowed-out sidewall structural design, which can reduce the overall weight of the turret structure 12 while ensuring structural rigidity, thereby facilitating the movement and transportation of the screening device.

[0072] like Figure 2 and Figure 4 As shown, in a specific embodiment, the top cover structure 21 is provided with a plurality of first fixing holes 212 , and a plurality of fixing members 1241 are protruded from the upper end of the fixing ring belt 124 , and the fixing members 1241 are detachably inserted into the first fixing holes 212 .

[0073] Specifically in this embodiment, the upper end of the fixing ring belt 124 protrudes upward to form a plurality of fixing parts 1241, and the fixing parts 1241 are used to be clamped in the first fixing hole 212 of the top cover structure 21 to realize the connection between the top cover structure 21 and the rotating frame structure 12. The fixing parts 1241 can pass through the first fixing hole 212 to realize the detachable connection between the fixing parts 1241 and the first fixing hole 212, that is, the top cover structure 21 is detachably connected to the rotating frame structure 12.

[0074] like Figure 4 and Figure 7 As shown, in a specific embodiment, a screening ring belt 222 is protruded from the upper end of the screening structure 22 along its own radial outward direction, and a plurality of second fixing holes 2221 are opened on the screening ring belt 222, and the fixing parts 1241 are sequentially passed through the second fixing holes 2221 and the first fixing holes 212.

[0075] Specifically in this embodiment, the screening annular belt 222 is formed by radially protruding outward on the peripheral side wall of the screening structure 22, which can avoid direct contact between the side wall of the screening structure 22 and the bracket 122, thereby avoiding the occurrence of a situation that affects the screening effect; a plurality of second fixing holes 2221 are vertically opened on the screening annular belt 222, and the setting positions of the plurality of second fixing holes 2221 correspond to the setting positions of the plurality of first fixing holes 212 of the top cover structure 21, so that the fixing member 1241 can simultaneously penetrate the first fixing hole 212 and the second fixing hole 2221. The fixing member 1241 is sequentially penetrated in the second fixing hole 2221 and the first fixing hole 212, that is, the stacking relationship of the turret structure 12, the screening structure 22, and the top cover structure 21 is realized from bottom to top, that is, the top cover structure 21 is covered at the upper end opening of the turret structure 12 and the screening structure 22. In this embodiment, there are two screening structures 22, which are arranged inside and outside. The screening ring belts 222 of the two screening structures 22 are stacked up and down, that is, the second fixing holes 2221 of the two screening ring belts 222 are correspondingly connected up and down.

[0076] For reference Figure 7 and Figure 8As shown, in this embodiment, a first sealing rubber ring 31 and a first rubber ring fixing plate 32 are respectively provided at the lower ends of the two screening ring belts 222, and the inner ring diameters of the screening ring belts 222 of the two screening structures 22 are different to avoid the position interference of the first sealing rubber rings 31 and the first rubber ring fixing plates 32 of the two screening ring belts 222, and the situation that the screening ring belts 222 cannot be tightly connected occurs; the first rubber ring fixing plate 32 of this embodiment is a circular ring structure, and the first rubber ring fixing plate 32 is concentrically arranged with the screening structure 22. The first rubber ring fixing plate 32 is used to fix the radial movement of the first sealing rubber ring 31, so that the first sealing rubber ring 31 can be fixed in a fixed position in the radial direction of the screening structure 22; the lower end of the top cover structure 21 of this embodiment is also provided with a second sealing rubber ring 41 and a second rubber ring fixing plate 42, and the second rubber ring fixing plate 42 of this embodiment is a circular ring structure The second rubber ring fixing plate 42 is concentrically arranged with the top cover structure 21, and the second rubber ring fixing plate 42 is used to fix the radial movement of the second sealing rubber ring 41, so that the second sealing rubber ring 41 can be fixed in a fixed position in the radial direction of the top cover structure 21; the first sealing rubber ring 31 of the upper screening ring belt 222 of this embodiment can be tightly abutted with the inner ring edge of the lower screening ring belt 222, used to seal the radial gap between the upper ends of the two screening structures 22, and the inner ring edge of the uppermost screening ring belt 222 can be tightly abutted with the second sealing rubber ring 41 of the top cover structure 21, used to seal the radial gap between the screening structure 22 and the upper end of the top cover structure 21, to prevent coal powder from leaking from the gap during the screening process, thereby ensuring the airtightness of the screening structure 22, the first sealing rubber ring 31 and the second sealing rubber ring 41 are made of rubber and are elastic.

[0077] like Figure 1 As shown, in one embodiment, there is a gap between two adjacent screening structures 22 from the inside to the outside, and the gap is greater than or equal to 20 mm.

[0078] The pulverized coal screening device provided in this embodiment can avoid the situation where one screening structure 22 cannot be placed in another screening structure 22 by limiting the distance between two adjacent screening structures 22 from the inside to the outside, that is, limiting the size of different screening structures 22 from the inside to the outside.

[0079] Specifically in this embodiment, the gap between two adjacent screening structures 22 from the inside to the outside is greater than or equal to 20 mm, which can facilitate the removal and placement of the screening structure 22 during actual use, and can also provide coal powder with space to pass through the sieve holes 221 of the inner screening structure 22 during the screening process and slide from the inner wall of the outer screening structure 22 to the bottom of the screening structure 22; it also avoids the situation where the coal powder is stuck between adjacent screening structures 22 due to the gap being too small.

[0080] like Figure 7 and Figure 8 As shown, in a specific embodiment, a first inclined surface 223 arranged around the rotation axis B of the screening structure 22 is formed at the bottom of the screening structure 22 , and the radial distal end of the first inclined surface 223 is higher than the radial proximal end of the first inclined surface 223 .

[0081] Specifically in this embodiment, the first inclined surface 223 is used to provide space for the coal powder to slide during the centrifugal movement. During the centrifugal movement, the coal powder is affected by the centrifugal force and moves along the first inclined surface 223 toward the four sides of the screening structure 22, so that a large amount of coal powder can be spread along the first inclined surface 223. It can also move along the first inclined surface 223 to the side wall of the screening structure 22 and spread, avoiding the accumulation of coal powder and the failure of coal powder that should be screened to be screened. After the centrifugal movement process is completed, the coal powder can slide along the first inclined surface 223 to the lowest position of the screening structure 22.

[0082] In this embodiment, the radial distal end of the first inclined surface 223 is higher than the radial proximal end of the first inclined surface 223 , that is, the first inclined surface 223 is in an inclined surface shape with an outer side higher and an inner side lower.

[0083] like Figure 7 and Figure 8 As shown, in a specific embodiment, the first inclined surface 223 forms a first angle D1 with the horizontal plane, and the first angle D1 is 20° to 40°.

[0084] The pulverized coal screening device provided in this embodiment has a first angle D1 formed between the first inclined surface 223 and the horizontal plane. This ensures that the first inclined surface 223 has a long upward slope, ensuring that the pulverized coal is adequately screened on the first inclined surface 223 and that the pulverized coal falls back to the lowest position after the centrifugal force is lost. A preferred first angle D1 in this embodiment is 30°.

[0085] like Figure 7 and Figure 8 As shown, in one embodiment, the bottom of the screening structure 22 is further formed with a second inclined surface 224 and a deposition surface 225 arranged around the rotation axis B of the screening structure 22;

[0086] The second inclined surface 224 , the deposition surface 225 , and the first inclined surface 223 are sequentially arranged radially outward from the bottom center of the screening structure 22 ; the second inclined surface 224 forms a second angle D2 with the horizontal plane, and the deposition surface 225 is parallel to the horizontal plane.

[0087] The coal powder screening device provided in this embodiment is provided with a second inclined surface 224. In one embodiment, the radial proximal end of the second inclined surface 224 is higher than the radial distal end of the second inclined surface 224, so that the coal powder can stay on the deposition surface 225 when it is stationary. During the screening process, because the coal powder is closer to the radial outer side of the screening structure 22, the centrifugal force applied to the coal powder is greater, and the screening can be faster and more complete.

[0088] like Figure 7 and Figure 8 As shown, in a specific embodiment, the radial proximal end of the second inclined surface 224 is higher than the radial distal end of the second inclined surface 224, and the second angle D2 is 70° to 80°.

[0089] The coal powder screening device provided in this embodiment has a radial proximal end of the second inclined surface 224 higher than the radial distal end of the second inclined surface 224, that is, the bottom of the screening structure 22 is in a "W" shape, that is, during the centrifugal process, the coal powder will move along the first inclined surface 223 and be fully screened on the first inclined surface 223; after the centrifugal movement process is completed, the coal powder can slide along the first inclined surface 223 to the deposition surface 225, and prevent the coal powder from sliding to the center of the screening structure 22. Because the deposition surface 225 is closer to the radial outer side of the screening structure 22, the centrifugal force applied to the coal powder is greater, and the screening can be faster and more complete; in this embodiment, the preferred second angle D2 is 75°, and the steeper angle ensures that the coal powder will not stay in the center of the screening structure 22.

[0090] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pulverized coal screening device, characterized in that: include: The base mechanism comprises a base structure and a rotating frame structure, wherein the rotating frame structure is rotatably disposed in an inner cavity of the base structure; A screening mechanism comprising a top cover structure for connecting to an external mechanical rotation source and at least two screening structures for centrifugally rotating and screening the coal powder; The screening structure is arranged on the inner side of the rotating frame structure, and the top cover structure is detachably connected and covers the upper end openings of the rotating frame structure and the screening structure. Each of the screening structures is sequentially arranged from the inside to the outside, and each of the screening structures is provided with sieve holes, and the aperture size of the sieve holes of the screening structure located radially outside is smaller than the aperture size of the sieve holes of the screening structure located radially inside.

2. The pulverized coal screening device according to claim 1, characterized in that: A driving block for connecting to an external mechanical rotation source is protruded upward from the upper end of the top cover structure. The driving block can drive the turret structure and the screening structure to rotate around the rotation axis of the turret structure through the top cover structure.

3. The pulverized coal screening device according to claim 2, characterized in that: The rotation axis of the screening structure is collinear with the rotation axis of the turret structure and is arranged in a vertical direction.

4. The pulverized coal screening device according to claim 3, characterized in that: The driving block is vertically extended upward along the rotation axis of the screening structure, and the driving block has a clamping portion.

5. The pulverized coal screening device according to claim 2 or 3, characterized in that: The rotating frame structure includes a base plate, a plurality of brackets, and a bearing structure; The bearing structure is rotatably arranged on the inner bottom wall of the base structure along the axis of the rotating frame structure, and the rotating end of the bearing structure is connected to the center of the bottom plate; The plurality of brackets are arranged at intervals along the periphery of the bottom plate, the lower ends of the plurality of brackets are connected to the bottom plate, and the upper ends of the plurality of brackets are sequentially connected to the screening structure and the top cover structure.

6. The pulverized coal screening device according to claim 5, characterized in that: The rotating frame structure further comprises: A fixed ring belt is arranged around the circumference of the base plate, and the lower end of the fixed ring belt is connected to the upper ends of the multiple brackets.

7. The pulverized coal screening device according to claim 6, characterized in that: The top cover structure is provided with a plurality of first fixing holes, and the upper end of the fixing ring band is protruded with a plurality of fixing members, and the fixing members are detachably inserted into the first fixing holes.

8. The pulverized coal screening device according to claim 7, characterized in that: The upper end of the screening structure is provided with a screening ring belt protruding radially outwardly. The screening ring belt is provided with a plurality of second fixing holes. The fixing members are sequentially inserted into the second fixing holes and the first fixing holes.

9. The pulverized coal screening device according to claim 1, characterized in that: There is a gap between two adjacent screening structures from the inside to the outside, and the gap is greater than or equal to 20 mm.

10. The pulverized coal screening device according to claim 3, characterized in that: A first inclined surface arranged around the rotation axis of the screening structure is formed at the bottom of the screening structure, and a radial distal end of the first inclined surface is higher than a radial proximal end of the first inclined surface.

11. The pulverized coal screening device according to claim 10, characterized in that: The first inclined surface forms a first angle with the horizontal plane, and the first angle is 20° to 40°.

12. The pulverized coal screening device according to claim 10, characterized in that: The bottom of the screening structure is further formed with a second inclined surface and a deposition surface arranged around the rotation axis of the screening structure; The second inclined surface, the deposition surface, and the first inclined surface are arranged radially outward in sequence from the bottom center of the screening structure; the second inclined surface forms a second angle with the horizontal plane, and the deposition surface is parallel to the horizontal plane.

13. The pulverized coal screening device according to claim 12, characterized in that: The radial proximal end of the second inclined surface is higher than the radial distal end of the second inclined surface, and the second included angle is 70° to 80°.

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