Dynamic classifier provided with structure for preventing blade wear

Abstract

The purpose of the present invention is to provide a dynamic classifier provided with a structure for preventing blade wear, the dynamic classifier comprising: an upper disk (120); a lower disk (130); an intermediate disk (140) disposed between the upper disk (120) and the lower disk (130); a plurality of classification blades (146) coupled to the upper disk (120), the lower disk (130), and the intermediate disk (140); a bottom plate (150) coupled to the lower disk (130); and a thermal spray coating (160) formed on the plurality of the classification blades (146) to prevent wear of the classification blades (146).

Description

Dynamic classifier equipped with a wing wear prevention structure

[0001] The present invention relates to a dynamic classifier equipped with a wing wear prevention structure, and more specifically, to a dynamic classifier equipped with a wing wear prevention structure of a novel configuration that implements a thermal spray coating to prevent wear of the classifier wings due to dynamic classification operations and is equipped with a fastening structure for the separation and retrieval of the classifier.

[0002] Generally, coal used as fuel in thermal power plants is fed into a boiler and burned. The heat from the combustion heats the water, which then turns into steam. This high-temperature, high-pressure steam rotates the blades of a turbine to generate electricity. At this time, the coal is finely crushed and fed into the boiler to increase combustion efficiency by combining with oxygen from the air that is additionally introduced inside the boiler; the device that performs this function of finely crushing the coal is a pulverizer.

[0003] Fine coal crushed through the pulverizer is moved upward through a classifier and discharged into the boiler, and a pulverizer including a classifier is used so that coal with coarse particles falls in the classifier and is re-crushed.

[0004] However, during the classification operation of the dynamic classifier, a problem is occurring where the classification blades wear out due to friction with the coal as they rotate.

[0005] In addition, there is a problem in that the large size of the dynamic classifier causes difficulties in bringing it in.

[0006]

[0007] The objective of the present invention is to provide a dynamic classifier equipped with a wing wear prevention structure of a novel configuration, which implements a thermal spray coating to prevent wear on the main part (classification wing) due to dynamic classification operations and is equipped with a fastening structure for the separation and retrieval of the classifier.

[0008]

[0009] According to the present invention for solving the above-mentioned problem, a dynamic classifier having a wing wear prevention structure is provided, characterized by comprising: an upper disc (120); a lower disc (130); an intermediate disc (140) disposed between the upper disc (120) and the lower disc (130); a plurality of sorting wings (146) coupled to the upper disc (120), the lower disc (130), and the intermediate disc (140); a bottom plate (150) coupled to the lower disc (130) and having a lower shaft coupling hole (132) formed in the center; and a plurality of wing coupling holes (142) formed in an elongated hole shape extending a certain length from the outer surface of the intermediate disc (140) toward the inner surface, to which the sorting wings (146) are coupled.

[0010] The above classification wings (146) include a thermal spray coating (160) formed on a plurality of the classification wings (146) to prevent wear, and the plurality of classification wings (146) are arranged diagonally to be twisted at a certain angle on the upper plate (120), lower plate (130), and intermediate plate (140).

[0011] The above intermediate plate (140) is provided with a plurality of wing coupling holes (142) in the shape of elongated holes extending a certain length from the outer surface to the inner surface, and a plurality of sorting wings (146) are inserted into the plurality of wing coupling holes (142) and fixed by welding, so that a plurality of sorting wings (146) are arranged diagonally to twist at a certain angle on the upper plate (120), lower plate (130), and intermediate plate (140).

[0012] The upper disc (120) is characterized by the fact that the lower disc (130) and the middle disc (140) are cut diagonally by a cutting section (SCP) so as to form a semicircle shape, and the upper disc (120) is fastened by a fastening means to form a disc shape.

[0013] When the upper disc (120), the lower disc (130), the middle disc (140), and the plurality of sorting wings (146) are combined, the dynamic classifier is configured to have a tapered shape in which the outer diameter becomes progressively smaller as it goes downward, and the plurality of sorting wings (146) are configured to be arranged so as to be inclined downward when viewed from the side of the dynamic classifier, and the upper disc (120), which is cut diagonally by the cutting part (SCP), is fastened by the fastening means to form a tapered dynamic classifier.

[0014] The above fastening means is characterized by including a pair of fastening support brackets (172) coupled to a first semicircular upper disc body (120A) on one side, and a fixing bolt (174) and a fixing nut (176) for fixing the fastening support brackets (172) to a second semicircular upper disc body (120B) on the other side.

[0015]

[0016] The present invention has the effect of solving the problem of wear on the sorting blades caused by friction with coal during rotation by applying a thermal spray coating to the sorting blade portion, which is a key part of the dynamic sorter, and also has the effect of extending the lifespan by preventing wear on the sorting blades.

[0017] In addition, while conventional dynamic sorters have the problem of causing difficulties in bringing them in due to their large volume, the present invention is configured such that the main parts—the upper, lower, and middle discs—are cut diagonally and assembled using a fastening structure, thereby providing the effect of facilitating the easy operation of bringing in the dynamic sorter.

[0018]

[0019] FIG. 1 is a plan view showing the upper disc, middle disc, and lower disc, which are the main parts of a dynamic classifier equipped with a wing wear prevention structure according to the present invention, cut in half.

[0020] FIG. 2 is a plan view showing the combined state of the upper disc, middle disc, and lower disc illustrated in FIG. 1.

[0021] FIGS. 3 and 4 are plan views schematically showing the state in which the upper disc, middle disc, and lower disc, which are the main parts shown in FIG. 2, are joined using a fastening support bracket, fixing bolts, and fixing nuts.

[0022] FIG. 5 is a plan view showing the structure of a dynamic classifier equipped with a wing wear prevention structure according to the present invention.

[0023] FIGS. 6 and 7 are plan views showing enlarged views of the main parts illustrated in FIG. 5, including the classification wing, lower reinforcing connection bracket, lower connection bolt, and lower connection nut.

[0024] FIG. 8 is a drawing showing an enlarged view of a part of the main parts illustrated in FIG. 6, including the classification wing, lower reinforcing connection bracket, lower connection bolt, and lower connection nut.

[0025] FIG. 9 is a side cross-sectional view showing the upper disc, middle disc, lower disc, and part of the sorting wing, which are the main parts of a dynamic classifier equipped with a wing wear prevention structure according to the present invention.

[0026] FIG. 10 is a side cross-sectional view showing an enlarged portion of the lower disc, the fastening support bracket, the fixing bolt, and the fixing nut, which are the main parts shown in FIG. 9.

[0027] FIG. 11 is a plan view showing an enlarged view of the first coupling guide projection and the first coupling guide groove, and the second coupling guide projection and the second coupling guide groove portions, which are other main parts of the lower disc that is a main part of the present invention.

[0028] FIG. 12 is a drawing showing an enlarged view of the first coupling guide projection and the second coupling guide groove portions illustrated in FIG. 11.

[0029] FIG. 13 is a drawing showing an enlarged view of the second coupling guide projection and the first coupling guide groove portion illustrated in FIG. 11.

[0030] FIG. 14 is a plan view showing the state in which the lower disc, which is the main part of the present invention, is joined by a lower reinforcing connecting bracket, a lower connecting bolt, and a lower connecting nut.

[0031] FIG. 15 is a plan view showing the structure of a bolt cover, which is another key part of the present invention.

[0032] FIG. 16 is a plan view showing the structure of a fastening support bracket, which is a main part of the present invention.

[0033] FIG. 17 is a side view schematically showing the structure of the sorting wing and the thermal spray coating, which are the main parts of the present invention.

[0034] FIG. 18 is a drawing showing a part of a dynamic classifier equipped with a wing wear prevention structure according to the present invention,

[0035] FIG. 19 is a drawing showing an enlarged view of the structure of the fastening means, which is a main part of the present invention.

[0036] FIG. 20 is a bottom view showing the structure of a bottom plate, which is a main part of the present invention,

[0037] FIGS. 21 and FIGS. 22 are bottom views showing the structure of a split bottom forming plate forming the bottom plate illustrated in FIG. 20,

[0038] FIG. 23 is a planar cross-sectional view showing an enlarged structure of a modified embodiment of the sorting wing and the thermal spray coating portion, which are the main parts of the present invention.

[0039]

[0040] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The objectives, features, and advantages of the present invention will be more easily understood by referring to the attached drawings and the following detailed description. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the present invention, such detailed description is omitted.

[0041] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by these terms. For example, if it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.

[0042] FIG. 1 is a plan view showing the upper disc, middle disc, and lower disc, which are the main parts of a dynamic classifier equipped with a wing wear prevention structure according to the present invention, cut in half; FIG. 2 is a plan view showing the combined state of the upper disc, middle disc, and lower disc shown in FIG. 1; FIG. 3 and FIG. 4 are plan views schematically showing the combined state of the upper disc, middle disc, and lower disc, which are the main parts shown in FIG. 2, using a fastening support bracket, a fixing bolt, and a fixing nut; FIG. 5 is a plan view showing the structure of a dynamic classifier equipped with a wing wear prevention structure according to the present invention; FIG. 6 and FIG. 7 are plan views showing an enlarged view of the sorting wing, lower reinforcing connection bracket, lower connecting bolt, and lower connecting nut portions, which are the main parts shown in FIG. 5; FIG. 8 is a drawing showing an enlarged view of a part of the sorting wing, lower reinforcing connection bracket, lower connecting bolt, and lower connecting nut portions, which are the main parts shown in FIG. 6; FIG. 9 is a drawing showing the upper disc, middle disc, and lower disc, which are the main parts of a dynamic classifier equipped with a wing wear prevention structure according to the present invention and A side cross-sectional view showing a part of the sorting wing; FIG. 10 is a side cross-sectional view showing an enlarged portion of the lower disc, the fastening support bracket, the fixing bolt, and the fixing nut, which are the main parts illustrated in FIG. 9; FIG. 11 is a plan view showing an enlarged portion of the first coupling guide protrusion, the first coupling guide groove, the second coupling guide protrusion, and the second coupling guide groove, which are other main parts of the lower disc, which are the main parts of the present invention; FIG. 12 is a drawing showing an enlarged portion of the first coupling guide protrusion and the second coupling guide groove illustrated in FIG. 11; FIG. 13 is a drawing showing an enlarged portion of the second coupling guide protrusion and the first coupling guide groove illustrated in FIG. 11; FIG. 14 is a plan view showing the state in which the lower disc, which is the main part of the present invention, is coupled by the lower reinforcing connection bracket, the lower connecting bolt, and the lower connecting nut; FIG. 15 is a plan view showing the structure of the bolt cover, which is another main part of the present invention; FIG. 16 is a plan view showing the structure of the fastening support bracket, which is the main part of the present invention.FIG. 17 is a side view schematically showing the structure of the sorting wing and thermal spray coating, which are the main parts of the present invention; FIG. 18 is a drawing showing a part of a dynamic sorter equipped with a wing wear prevention structure according to the present invention; FIG. 19 is a drawing showing an enlarged view of the structure of the fastening means, which is the main part of the present invention; FIG. 20 is a bottom view showing the structure of the bottom plate, which is the main part of the present invention; FIG. 21 and FIG. 22 are bottom views showing the structure of a divided bottom forming plate forming the bottom plate shown in FIG. 20; and FIG. 23 is a plan cross-sectional view showing an enlarged view of the structure of a modified embodiment of the sorting wing and thermal spray coating portion, which are the main parts of the present invention.

[0043] Referring to the drawings, the dynamic classifier according to the present invention is characterized in that the lower shaft coupling hole (132) of the lower disc (130) is coupled to the rotation shaft connected to the motor shaft of the rotation drive motor of the pulverizer, and while rotating by the drive of the rotation drive motor, it classifies coarse-grained coal and fine-grained coal, and is configured to allow fine-grained coal to pass to one side and to transfer coarse-grained coal to the upper part of the pulverizer so as to move to the other side for re-pulverization.

[0044] The dynamic classifier of the present invention includes an upper disc (120), a lower disc (130), an intermediate disc (140), a classification wing (146), and a bottom plate (150) coupled to the lower disc (130).

[0045] The present invention is characterized by comprising an upper disc (120) in the shape of a circular ring plate, a lower disc (130) in the shape of a circular ring plate, an intermediate disc (140) in the shape of a circular ring plate disposed between the upper disc (120) and the lower disc (130), a plurality of sorting blades (146) coupled to the upper disc (120), the lower disc (130), and the intermediate disc (140) to move fine particles of coal being crushed upward and toward the discharge port formed in the pulverizer, a lower disc (130) formed in a structure coupled to the bottom surface of the lower disc (130) to allow the coal being crushed to move toward the sorting blades (146) through the periphery, and a thermal spray coating (160) formed on the plurality of sorting blades (146) to prevent the plurality of sorting blades (146) from wearing out due to friction with the coal being crushed.

[0046] A plurality of the above-mentioned sorting wings (146) are arranged diagonally to be twisted at a certain angle on the upper disc (120), lower disc (130), and middle disc (140) so as to move the finely ground coal particles, which are combined with the upper disc (120), lower disc (130), and middle disc (140), upwardly toward the discharge port formed in the pulverizer.

[0047] The lower plate (130) and the sorting wing (146) are composed of chrome carbide (Hi-C, Cr material) plates with excellent wear resistance.

[0048] The sorting wing (146) is configured in a plate-shaped wing shape, and the intermediate plate (140) is provided with a plurality of wing coupling holes (142) in the shape of elongated holes extending a certain length from the outer surface to the inner surface, and the plurality of wing coupling holes (142) are arranged in a diagonal direction, and the plurality of sorting wings (146) are inserted into the plurality of wing coupling holes (142) and fixed by welding, so that the plurality of sorting wings (146) are arranged in a diagonal direction to twist at a certain angle on the upper plate (120), the lower plate (130), and the intermediate plate (140), and the sorting wings (146) are configured to be firmly supported by the wing coupling holes (142) of the intermediate plate (140).

[0049] With the sorting wing (146) inserted into the diagonal wing coupling hole (142) of the intermediate plate (140) in a state where the sorting wing (146) is fixed to the intermediate plate (140) by welding, the sorting wing (146) can be more firmly supported and coupled by the wing coupling hole (142) of the intermediate plate (140).

[0050] In the present invention, the upper disc (120), the lower disc (130), and the middle disc (140) are diagonally cut by a cutting portion (SCP) to form a semicircle shape, and the upper disc (120) is fastened by a fastening means to form a disc shape.

[0051] In the present invention, the intermediate disc (140) is composed of an upper intermediate disc (140UMP) formed by combining a first semicircle upper intermediate disc body (140A) and a second semicircle upper intermediate disc body (140B), and a lower intermediate disc (140LMP) formed by combining a first semicircle lower intermediate disc body (140C) and a second semicircle lower intermediate disc body (140D).

[0052] The lower disc (130) is configured in the shape of a disc in which a first semicircular lower disc body (130A) and a second semicircular lower disc body (130B) are combined in a cut section (SCP) that is cut in a roughly straight line shape.

[0053] Meanwhile, in the present invention, the outer diameter of the middle plate (140) is relatively smaller than the outer diameter of the upper plate (120), and the outer diameter of the lower plate (130) is relatively smaller than the outer diameter of the middle plate (140), so that when the upper plate (120), the lower plate (130), the middle plate (140), and a plurality of sorting wings (146) are combined, the dynamic sorter is configured in a tapered shape in which the outer diameter becomes smaller as it goes downward.

[0054] Additionally, the plurality of sorting wings (146) are configured to be arranged so as to be inclined downward when viewed from the side of the dynamic sorter, and are combined with a fastening means attached to an upper disc (120) that is cut diagonally by a cutting section (SCP) and a lower reinforcing fastening means attached to a lower disc (130) that is cut by a lower cutting section (LSCP) in the shape of a horizontal line, so that when viewed from the side, they form a tapered dynamic sorter.

[0055] The above fastening means includes a pair of fastening support brackets (172) fixed by welding to one of the two semicircular upper plates (120) of the upper plate (120), a first semicircular upper plate body (120A), and a fixing bolt (174) and a fixing nut (176) for fixing the fastening support brackets (172) to the other second semicircular upper plate body (120B).

[0056] In the present invention, the upper disc (120) is separated into a first semicircular upper disc body (120A) and a second semicircular upper disc body (120B), the lower disc (130) is separated into a first semicircular lower disc body (130A) and a second semicircular lower disc body (130B), and the intermediate disc (140) is composed of a first semicircular upper intermediate disc body (140A) and a second semicircular upper intermediate disc body (140B). A portion of the bottom surface of a pair of fastening support brackets (172) is fixed by welding to one of the two semicircular upper disc bodies (120) of the upper disc (120), and the other portion of the bottom surface of the pair of fastening support brackets (172) is placed on the upper surface of the second semicircular upper disc body (120B) and the fastening support brackets (172) are fixed. By fixing the second semicircular upper disc body (120B) to the upper disc (120) in the shape of a circular ring plate by means of a bolt (174) and a fixing nut (176), the upper disc (120) in the shape of a circular ring plate, the lower disc (130) in the shape of a circular ring plate, and the intermediate disc (140) in the shape of a circular ring plate placed between the upper disc (120) and the lower disc (130) are assembled.

[0057] The above fixing bolt (174) is coupled to the bracket-side bolt insert hole penetrating the upper and lower surfaces of the fastening support bracket (172) and the upper-side bolt insert hole penetrating the upper and lower surfaces of the second semicircular upper disc body (120B), and when the fixing nut (176) is fastened to the fixing bolt (174) on the lower surface of the second semicircular upper disc body (120B), the upper disc (120) in which the first semicircular upper disc body (120A) and the second semicircular upper disc body (120B) are detachably coupled can be assembled.

[0058] At this time, the plurality of sorting wings (146) can be combined with the upper disc (120) in the shape of a circular ring plate, the lower disc (130) in the shape of a circular ring plate, and the middle disc (140) in the shape of a circular ring plate as described above, so that the plurality of sorting wings (146) are combined along the circumferential direction based on the center of the upper disc (120), the lower disc (130), and the middle disc (140).

[0059] In the present invention, a plurality of sorting wings (146) combined with a first semicircular upper disc body (120A), a first semicircular lower disc body (130A), and a first semicircular upper intermediate disc body (140A) can be referred to as a first split sorter body, and a plurality of sorting wings (146) combined with a second semicircular upper disc body (120B), a second semicircular lower disc body (130B), and a second semicircular upper intermediate disc body (140B) can be referred to as a second split sorter body. As described above, among the two semicircular upper disc bodies (120) of the upper disc (120), a portion of the bottom surface of a pair of fastening support brackets (172) is fixed by welding to one of the first semicircular upper disc bodies (120A), and the other portion of the bottom surface of the pair of fastening support brackets (172) is attached to the upper surface of the second semicircular upper disc body (120B). When the above-mentioned fastening support bracket (172) is fixed to the second semicircular upper disc body (120B) by means of a fixing bolt (174) and a fixing nut (176) while in the raised state, the first split classifier body and the second split classifier body can be assembled to form a dynamic classifier.

[0060] Meanwhile, the lower disc (130), which is the main part of the dynamic classifier of the present invention, is formed in the shape of a disc by being fastened by a lower reinforcing fastening means, and the lower reinforcing fastening means comprises a lower reinforcing connecting bracket (134) on one side, a portion of which is fixed by welding to a first semicircular lower disc body (130A) on one side, a lower connecting bolt (135) coupled to the lower reinforcing connecting bracket (134) and coupled to the second semicircular lower disc body (130B), a lower connecting nut (136) fastened to the lower connecting bolt (135), a lower reinforcing connecting bracket (134) on the other side, a portion of which is fixed by welding to the second semicircular lower disc body (130B) on the other side, another lower connecting bolt (135) coupled to the lower reinforcing connecting bracket (134) on the other side and coupled to the second semicircular lower disc body (130B), and a lower connecting nut (136) fastened to the lower connecting bolt.

[0061] Accordingly, since the lower support structure of the dynamic classifier is formed by the lower reinforcing fastening means of the present invention as a lower plate (130) in which a first semicircular lower plate body (130A) and a second semicircular lower plate body (130B) are combined, the bonding strength of the lower plate (130) itself is further increased.

[0062] In addition, the present invention relates to a detachable dynamic classifier with a wing part wear prevention type, wherein by applying a thermal spray coating (160) of a thermal spray wire (coating material, Cr, B-based alloy) to the classification wing (146) of the dynamic classifier using arc spray, the effect of reducing performance degradation and equipment lifespan reduction caused by wear (wear of the wing part) of the classification wing (146) during the rotation of the dynamic classifier is achieved, and additionally, the circular frame of the dynamic classifier, that is, the upper disc (120), the lower disc (130), and the middle disc (140), are diagonally cut by a cutting part (SCP) so that they become semicircular, and the upper disc (120), the lower disc (130), and the middle disc (140) that are diagonally cut by the cutting part (SCP) to become semicircular, specifically, the first semicircular upper disc body (120A) and the second semicircular upper disc body (120B) that are diagonally cut by the cutting part (SCP) to become semicircular, and By fastening and joining the first semicircle lower disc body (130A), the second semicircle lower disc body (130B), the first semicircle upper intermediate disc body (140A), and the second semicircle upper intermediate disc body (140B) using the fastening means, it is possible to freely attach and detach them, thereby enabling structural stability and easy maintenance.

[0063] In other words, the present invention has the effect of solving the problem of the sorting blade (146) wearing out due to friction with coal during rotation by applying a thermal spray coating (160) to the sorting blade (146), which is a main part of the dynamic sorter, and also has the effect of extending the lifespan by preventing wear of the sorting blade (146).

[0064] In addition, while there is a problem in that the large volume of the dynamic sorter in the past caused difficulties in bringing it in, the present invention is configured such that the main parts, namely the upper disc (120), lower disc (130), and middle disc (140), are cut diagonally by the cutting part (SCP) and assembled by a fastening structure, thereby having the effect of making it easy to bring in the dynamic sorter.

[0065] In addition, the present invention further includes a bottom plate (150) coupled to the lower plate (130).

[0066] In the present invention, the bottom plate (150) is configured such that a plurality of fan-shaped divided bottom forming plates (150DBP) are joined to the bottom surface of the lower plate (130) by welding, thereby forming a bottom plate (150) in the shape of a plate. In the present invention, the plurality of divided bottom forming plates (150DBP) are provided with welding holes (WH) penetrating through the upper and lower surfaces, and the portions of the welding holes (WH) are joined to the bottom surface of the lower plate (130) by Co2 welding (FACW). Additionally, the plurality of divided bottom forming plates (150DBP) are joined side by side by welding, thereby forming the bottom plate (150) into a rigid structure.

[0067] Meanwhile, on both sides of each divided bottom forming plate (150DBP) of the bottom plate (150), a semicircular bolt passage hole (BH) is provided, and a circular bolt passage hole is provided by the semicircular bolt passage holes (BH) of two adjacent divided bottom forming plates (150DBP). On the lower plate (130), an eyebolt coupling hole (130IBH) is provided at a position where it meets the bottom plate side bolt passage hole of the bottom plate (150) from above and below. By coupling an eyebolt to the eyebolt coupling hole (130IBH) of the lower plate (130) and coupling a lifting device (mainly, coupling the lifting rope of the lifting device) to the eyebolt, the dynamic sorter of the present invention can be lifted using the lifting device. The circular bolt passage hole of the bottom plate (150) serves to prevent the eye bolt from passing through and getting caught on the bottom plate (150) when the eye bolt is coupled to the eye bolt coupling hole (130IBH) of the lower plate (130).

[0068] Therefore, the effect of smoothly performing the operation of lifting the dynamic classifier of the present invention using the eyebolt coupling hole (130IBH) of the lower plate (130) and the eyebolt can be expected.

[0069] Meanwhile, the present invention has the effect of reducing performance degradation and equipment lifespan reduction caused by wear of the classification blade (146) (wear of the blade part) during rotation of the dynamic classification machine by applying a thermal spray coating (160) (coating material, Cr, B-based alloy) to the bottom surface of the bottom plate (150) using an arc spray wire, and also has the effect of reducing performance degradation and equipment lifespan reduction caused by wear of the bottom plate (150).

[0070] In addition, in the present invention, since the bottom plate (150) is joined to the bottom surface of the lower plate (130) by Co2 welding (FACW) a plurality of fan-shaped divided bottom forming plates (150DBP), the effect of increasing the convenience of joining the bottom plate (150) to the lower plate (130) can also be expected.

[0071] Additionally, the present invention further includes a lower reinforcing connection nut (137BT) coupled to the bolt cover (138) and the lower disc (130), and a lower reinforcing connection bolt (137NT) coupled to the bolt cover (138). The bolt cover (138) may also be divided into a semicircular ring plate shape by a bolt-side cutting portion (138GCP), and the bolt cover forming ring piece (138BCFM) divided into a semicircular ring plate shape may be configured to be coupled to the upper part of the lower disc (130) by the lower reinforcing connection nut (137BT) and the lower reinforcing connection bolt (137NT) while positioned on the upper part of the lower disc (130).

[0072] According to the present invention, when the lower reinforcing connecting nut (137BT) is connected to the bolt cover (138) and the lower disc (130) and the lower reinforcing connecting bolt (137NT) is tightened from the bottom of the lower disc (130), the bolt cover (138) is firmly fixed to the lower disc (130), thereby increasing the strength of the lower disc (130) by the bolt cover (138). Furthermore, since the rotation shaft connected to the motor shaft of the rotation drive motor of the pulverizer is connected to the cover-side coupling hole of the bolt cover (138), the lower disc (130), which is the main part of the pulverizer, the upper disc, the middle disc, and the classification wing (146) are more firmly connected.

[0073] In addition, the present invention is configured such that a lower reinforcing connecting bolt (137NT) is fastened to the lower reinforcing connecting nut (137BT) from below the bolt cover (138) while the lower reinforcing connecting nut (137BT) is coupled to the lower reinforcing connecting nut (137BT) and the lower disc (130) which is positioned on the bottom surface of the lower disc (130).

[0074] Accordingly, since the bolt cover (138) is firmly fixed to the lower plate (130), the present invention has the effect of increasing the strength of the lower plate (130) by the bolt cover (138). Furthermore, since the rotation shaft connected to the motor shaft of the rotation drive motor of the pulverizer is coupled to the cover-side coupling hole of the bolt cover (138), the effect of further strengthening the lower plate (130), upper plate (120), intermediate plate (150), and classification wing (146), which are the main parts of the pulverizer, can be expected.

[0075] Meanwhile, the present invention is divided into a first semicircular lower disc body (130A) and a second semicircular lower disc body (130B) by a lower cutting portion (LSCP), and the first semicircular lower disc body (130A) and the second semicircular lower disc body (130B) are joined by the lower reinforcing connecting bracket (134), the lower connecting bolt, and the lower connecting nut, thereby forming the lower disc (130). The inner end of the first semicircular lower disc body (130A) is provided with a first connecting guide projection (131A) protruding toward the second semicircular lower disc body (130B) and a first connecting guide groove (131B) concave in a direction away from the second semicircular lower disc body (130B), and the inner end of the second semicircular lower disc body (130B) is provided with the first connecting guide groove (131B) of the first semicircular lower disc body (130A). A second coupling guide projection (131C) protruding toward and a second coupling guide groove (131D) concave in a direction away from the first semicircular lower disc body (130A) are provided.

[0076] According to the present invention, when the lower disc (130) is fastened by the lower reinforcing fastening means and configured into a disc shape, the first coupling guide projection (131A) of the first semicircular lower disc body (130A) fits into the second coupling guide groove (131D) of the second semicircular lower disc body (130B), and the second coupling guide projection (131C) of the second semicircular lower disc body (130B) fits into the first coupling guide groove (131B) of the first semicircular lower disc body (130A). Therefore, since the first semicircular lower disc body (130A) and the second semicircular lower disc body (130B) constituting the lower disc (130) are prevented from shifting positions or deforming after being combined, the effect of further increasing the self-strength of the lower disc (130) is achieved. Furthermore, to form the lower disc (130), the first semicircular lower When assembling the disc body (130A) and the second semicircular lower disc body (130B), the assembly direction is made such that the assembly work of the lower disc (130) can be done easily and quickly.

[0077] Meanwhile, the front of the sorting wing (146) is formed with a tapered surface shape (147) in which the distance between the two sides gradually decreases, so that the front of the sorting wing (146) is streamlined.

[0078] Accordingly, when coarse-grained coal and fine-grained coal are classified by high-speed rotation of the dynamic classifier of the present invention, and fine-grained coal is passed to one side and coarse-grained coal is transferred to the upper part of the pulverizer to move to the other side for re-grinding, the fine-grained coal and coarse-grained coal can pass and be transferred more smoothly along the streamlined tapered surface (147), and even if used for a long time, the wear of the front part of the classifier blade (146) can be delayed as much as possible, thereby maximizing the lifespan of the classifier blade (146).

[0079] Terms such as "include," "compose," or "have" as described above, unless specifically stated otherwise, mean that the relevant component may be inherent; therefore, they should be interpreted as allowing for the inclusion of additional components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their meaning in the context of the relevant technology and, unless explicitly defined in the present invention, should not be interpreted in an ideal or overly formal sense.

[0080] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0081] Accordingly, the embodiments described above are provided to fully inform those skilled in the art of the scope of the invention and should be understood as illustrative in all respects and not restrictive, and the invention is defined only by the scope of the claims.

Claims

1. Upper disc (120) and, lower disc (130) and, An intermediate plate (140) positioned between the upper plate (120) and the lower plate (130), and A plurality of sorting wings (146) coupled to the upper disc (120), the lower disc (130), and the intermediate disc (140), and A bottom plate (150) coupled to the lower plate (130) above, and It includes a plurality of wing coupling holes (142) formed in the shape of elongated holes extending a certain length from the outer surface to the inner surface of the intermediate plate (140) to which the classification wing (146) is coupled. The upper disc (120), the lower disc (130), and the middle disc (140) are diagonally cut by a cutting section (SCP) to form a semicircle shape, and the upper disc (120) is fastened by a fastening means to form a disc shape. When the upper disc (120), the lower disc (130), the middle disc (140), and the plurality of sorting wings (146) are combined, the dynamic classifier is configured to have a tapered shape in which the outer diameter gradually decreases as it goes downward, and the plurality of sorting wings (146) are configured to be arranged so as to be inclined downward when viewed from the side of the dynamic classifier, and the upper disc (120), which is cut diagonally by the cutting part (SCP), is fastened by the fastening means to form a tapered dynamic classifier. The above fastening means is, A pair of fastening support brackets (172) coupled to the first semicircular upper disc body (120A) on one side, and It includes a fixing bolt (174) and a fixing nut (176) for fixing the fastening support bracket (172) to the upper disc body (120B) of the second semicircle on the other side, The lower disc (130) is fastened by a lower reinforcing fastening means and configured in the shape of a disc, The above lower reinforcing fastening means is, A lower reinforcing connecting bracket (134) on one side, a portion of which is fixed by welding to a first semicircular lower disc body (130A) on one side, and A lower connecting bolt (135) that is connected to the lower reinforcing connecting bracket (134) and connected to the second semicircular lower disc body (130B), and A lower connecting nut (136) that is fastened to the lower connecting bolt (135) above, and A lower reinforcing connecting bracket (134) on the other side, a portion of which is fixed by welding to the lower disc body (130B) on the other side, and It includes another lower connecting bolt (135) that is connected to the lower reinforcing connecting bracket (134) on the other side and connected to the second semicircular lower disc body (130B), and a lower connecting nut (136) that is fastened to the lower connecting bolt. The lower plate (130) is formed by dividing the first semicircular lower plate body (130A) and the second semicircular lower plate body (130B) by the lower cutting section (LSCP), and by joining the first semicircular lower plate body (130A) and the second semicircular lower plate body (130B) by the lower reinforcing connecting bracket (134), the lower connecting bolt, and the lower connecting nut. The inner end of the first semicircular lower plate body (130A) is provided with a first connecting guide projection (131A) protruding toward the second semicircular lower plate body (130B) and a first connecting guide groove (131B) concave in a direction away from the second semicircular lower plate body (130B), and the inner end of the second semicircular lower plate body (130B) is provided with a projection protruding toward the first connecting guide groove (131B) of the first semicircular lower plate body (130A). A dynamic classifier having a wing wear prevention structure, characterized by being configured to have a second coupling guide groove (1391) that is concave in a direction away from the second coupling guide protrusion (131C) and the first semicircular lower disc body (130A).

2. In Paragraph 1, It includes a thermal spray coating (160) formed on a plurality of sorting wings (146) to prevent the sorting wings (146) from wearing out, A plurality of the above-mentioned sorting wings (146) are arranged diagonally to be twisted at a certain angle on the upper disc (120), lower disc (130), and middle disc (140), and A dynamic classifier having a wing wear prevention structure, characterized in that the bottom plate (150) and the classifying wing (146) are composed of a chrome carbide (Hi-C, Cr material) plate with excellent wear resistance.

3. In Paragraph 2, A dynamic classifier having a wing wear prevention structure, characterized in that the intermediate plate (140) is provided with a plurality of wing coupling holes (142) in the shape of elongated holes extending a certain length from the outer surface to the inner surface, and a plurality of sorting wings (146) are inserted into the plurality of wing coupling holes (142) and fixed by welding, so that a plurality of sorting wings (146) are arranged diagonally to twist at a certain angle on the upper plate (120), lower plate (130), and intermediate plate (140).

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