Crushing impeller of fan coal mill

Abstract

The utility model discloses a crushing impeller of a fan coal mill, and relates to the technical field of impellers of fan coal mills. The crushing impeller comprises an impeller body, a bearing disc is arranged above the impeller body, a plurality of groups of serrated knives are fixed at the top of the bearing disc in an annular array shape, and base cylinders connected with the impeller body are arranged in the serrated knives; multiple sets of L-shaped notches are formed in the outer wall of the curved surface of the impeller body in an annular array shape, and main blades are assembled at the positions, located at the top of the impeller body, of the edges of the multiple sets of impeller bodies at intervals. According to the utility model, the force bearing disc bears the force generated when coal briquettes fall off and plays a role in preliminary scattering, the auxiliary sheets and the main blades at the bottom can promote the coal briquettes to move back and forth in the radial direction, the scattering path of the coal briquettes is longer, and meanwhile, the main blades and the auxiliary sheets which rotate at a high speed are utilized to fulfill the aim of comprehensively scattering the coal briquettes; and coal briquettes below can be conveniently and efficiently ground, so that the working efficiency of the pulverizer is improved in a disguised manner.

Description

Technical Field

[0001] This utility model relates to the field of impeller technology for fan coal mills, specifically a crushing impeller for a fan coal mill. Background Technology

[0002] A fan impeller is a type of impeller that draws air in axially and discharges it radially, using centrifugal force to increase air pressure. Similarly, this working principle can be used to design a similarly structured pulverizer to crush various materials.

[0003] A search of the China Patent Network revealed a patent document with publication number CN 220657803U, which discloses a fan-type coal mill pulverizing blade. The blade is mounted on a mounting plate on the impeller body via a threaded connection between a fastening bolt and a fastening nut. Rotating the fastening nut, which is threaded to the fastening bolt, allows the fastening bolt to be separated from the impeller body. This improves the convenience of blade assembly and disassembly for workers. The separate installation of the blade and the impeller body means that when the blade wears out, it is not necessary to replace the entire blade; only the individual blade needs to be replaced, thus avoiding waste.

[0004] A search of the China Patent Network revealed a patent document with publication number CN 212018114U, which discloses a coal mill that can improve the life of its impact wheel. This invention enhances the wear resistance of the impact wheel surface by welding manganese steel plates onto it, making the impact wheel less prone to wear. This reduces the frequency of maintenance, lowers the workload of repairs, extends equipment uptime, improves work efficiency, ensures the equipment operates normally, and reduces limitations in its use.

[0005] As can be seen from the above two comparative technologies, the force generated by the blades on the impeller body to break up the falling coal is relatively simple, and the coal may even remain on the impeller body temporarily, which will block the subsequent falling coal and reduce the working efficiency of coal grinding. Therefore, a fan mill crushing impeller is proposed. Utility Model Content

[0006] Based on this, the purpose of this utility model is to provide a pulverizing impeller for a fan-driven coal mill to solve the technical problems mentioned in the background.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a fan-type coal mill pulverizing impeller, including an impeller body, a bearing plate above the impeller body, and multiple sets of serrated blades fixed in a circular array on the top of the bearing plate, with a base cylinder connected to the impeller body inside the serrated blades.

[0008] The outer wall of the impeller body has multiple sets of L-shaped notches arranged in a ring array. Multiple sets of main blades are installed at intervals on the top of the impeller body at the edges of the impeller body. Multiple sets of auxiliary blades are fixed to the top of the impeller body at the bottom of the load-bearing plate. Three sets of conical plates are fixed to the outside of each set of auxiliary blades.

[0009] As a preferred technical solution, a discharge hole is provided at the top center of the impeller body, and the bottom fine discharge hole of the base cylinder extends to the bottom of the impeller body.

[0010] As a preferred technical solution, the outer wall of the base cylinder is fixed with multiple sets of inclined positioning rods, and the end of each set of positioning rods is fixed to the bottom of the impeller body.

[0011] As a preferred technical solution, the curved inner wall of the base cylinder is provided with two sets of keyways extending to the upper and lower ends of the base cylinder.

[0012] As a preferred technical solution, multiple sets of the auxiliary blades are arranged in a ring array on the top of the impeller body, and each set of the auxiliary blades is inclined, with the inclination angle of the auxiliary blades opposite to that of the main blades.

[0013] As a preferred technical solution, the top of the serrated blade has a groove with teeth that are smaller in the middle and larger at the edges.

[0014] As a preferred technical solution, bolts are installed at the bottom of the impeller body corresponding to the positions of each group of main blades, and the bolts extend through the impeller body into the main blades. The bottom of the main blades is provided with threaded holes that match the bolts.

[0015] In summary, the present invention has the following main advantages:

[0016] This invention uses a bearing plate to bear the force of falling coal blocks and to initially break them up. The bottom auxiliary blades and main blades cause the coal blocks to move back and forth radially, resulting in a longer path for the coal blocks to be broken up. At the same time, the high-speed rotating main blades and auxiliary blades complete the purpose of breaking up the coal blocks, which facilitates efficient grinding of the coal blocks below, thereby indirectly improving the working efficiency of the grinding mill. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a structural diagram of the load-bearing plate of this utility model;

[0019] Figure 3 This is a structural diagram of the impeller body of this utility model;

[0020] Figure 4 This is a bottom view of the impeller body of this utility model;

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the base cylinder of this utility model.

[0022] In the diagram: 100, impeller body; 101, discharge hole; 102, bolt;

[0023] 110, L-notch; 120, main blade; 130, load-bearing plate; 140, serrated blade; 150, base cylinder; 151, keyway; 160, positioning rod; 170, auxiliary blade; 171, cone head plate. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] The embodiments of this utility model will be described below based on its overall structure.

[0026] A fan-driven coal mill pulverizing impeller, such as Figures 1 to 5 As shown, it includes an impeller body 100, a load-bearing plate 130 is provided above the impeller body 100, and multiple sets of serrated blades 140 are fixed in a ring array on the top of the load-bearing plate 130. The interior of the serrated blades 140 is provided with a base cylinder 150 connected to the impeller body 100.

[0027] The outer wall of the impeller body 100 has multiple sets of L-shaped notches 110 arranged in a ring array. The edges of the multiple sets of impeller bodies 100 are equipped with main blades 120 at intervals at the top of the impeller body 100. The bottom of the bearing plate 130 is provided with multiple sets of auxiliary blades 170 fixed to the top of the impeller body 100. Each set of auxiliary blades 170 has three sets of conical plates 171 fixed to its outer surface.

[0028] Multiple sets of secondary blades 170 are arranged in a ring array on the top of the impeller body 100. Each set of secondary blades 170 is inclined, and the inclination angle of the secondary blades 170 is opposite to that of the main blades 120.

[0029] When the external power unit drives the impeller to rotate, the impeller body 100 and the upper bearing plate 130 rotate synchronously under the transmission of the base cylinder 150. Some of the coal blocks falling from above will contact the bearing plate 130, and the serrated blade 140 will pierce some of the coal blocks. Under the centrifugal force generated by the rotation of the bearing plate 130, the coal blocks will fly to the edge and contact the impeller body 100. The two ends of the main blade 120 are conical, so the coal blocks will be broken up and will fall below through the L-notch 110 and the feed hole 101 for grinding.

[0030] Coal chunks that fall directly onto the top of the impeller body 100 cannot be effectively broken up due to the rotation of the main blades 120. At this time, the auxiliary blades 170 will impact the coal chunks until they are broken up, and will also exert outward pressure on the hard coal chunks, causing the coal chunks to collide back and forth between the main blades 120 and the auxiliary blades 170, eventually achieving the purpose of breaking them up. The coal chunks will then enter the discharge hole 101 through the L-notch 110 and the air between the two sets of auxiliary blades 170, thus completing the purpose of discharging the coal.

[0031] Please refer to this carefully. Figure 1 , Figure 3 and Figure 4 A discharge hole 101 is provided at the top center of the impeller body 100, and the bottom fine discharge hole 101 of the base cylinder 150 extends to the bottom of the impeller body 100.

[0032] It facilitates the falling of crushed coal blocks from the feed hole 101 and provides storage space for the base cylinder 150, thereby connecting the impeller body 100 to the load-bearing plate 130 via the base cylinder 150.

[0033] Please refer to this carefully. Figure 2 and Figure 5 Multiple sets of inclined positioning rods 160 are fixed to the outer wall of the base cylinder 150, and the end of each set of positioning rods 160 is fixed to the bottom of the impeller body 100.

[0034] The impeller body 100 is fixed to the base cylinder 150 by the positioning rod 160, so that the impeller body 100 and the bearing plate 130 rotate synchronously to break up the coal blocks.

[0035] Please refer to this carefully. Figure 5 The curved inner wall of the base cylinder 150 is provided with two sets of keyways 151 extending to the upper and lower ends of the base cylinder 150.

[0036] The keyway is designed to create a constraint between the external drive shaft and the base cylinder 150, thereby driving the base cylinder 150 to rotate under the influence of the external drive shaft.

[0037] Please refer to this carefully. Figure 1 and Figure 2 The top of the serrated cutter 140 has a groove with a small center and a large edge.

[0038] The serrated blade 140 is used to initially pierce and break up the falling coal blocks. Different tooth sizes are needed to meet the needs of coal blocks of various sizes and to avoid deformation of the serrated blade 140 when subjected to the impact of the coal blocks.

[0039] Please refer to this carefully. Figure 1Bolts 102 are installed at the bottom of the impeller body 100 and at the corresponding positions of each set of main blades 120. The bolts 102 extend through the impeller body 100 and into the main blades 120. The bottom of the main blades 120 is provided with threaded holes that match the bolts 102.

[0040] By using the bolt threaded hole connection method, one of the damaged main blades 120 can be disassembled and replaced, which can reduce the usage cost of the impeller body 100.

[0041] When in use, when the external power device drives the impeller to rotate, the impeller body 100 and the upper bearing plate 130 rotate synchronously under the transmission of the base cylinder 150. Some coal blocks falling from above will contact the bearing plate 130, and the serrated blade 140 will pierce some of the coal blocks. Under the centrifugal force generated by the rotation of the bearing plate 130, the coal blocks will fly to the edge and contact the impeller body 100. The two ends of the main blade 120 are conical, so the coal blocks will be broken up and will fall below through the L-notch 110 and the feed hole 101 for grinding.

[0042] Coal chunks that fall directly onto the top of the impeller body 100 cannot be effectively broken up due to the rotation of the main blade 120. At this time, the auxiliary blade 170 will impact the coal chunks until they are broken up, and will also exert an outward squeezing force on the hard coal chunks, causing the coal chunks to collide back and forth between the main blade 120 and the auxiliary blade 170, eventually achieving the purpose of breaking them up. The coal chunks will then enter the discharge hole 101 through the L-notch 110 and the air between the two sets of auxiliary blades 170, thus completing the purpose of discharging. All parts of this device not mentioned are the same as or can be implemented using existing technology.

[0043] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A fan-driven coal mill pulverizing impeller, comprising an impeller body (100), characterized in that: The impeller body (100) is provided with a support plate (130) above it. The top of the support plate (130) is fixed with multiple sets of serrated blades (140) in a ring array. The inside of the serrated blades (140) is provided with a base cylinder (150) connected to the impeller body (100). The outer wall of the impeller body (100) has multiple sets of L-shaped notches (110) arranged in a ring array. The edges of the multiple sets of impeller bodies (100) are equipped with main blades (120) at intervals on the top of the impeller body (100). The bottom of the bearing plate (130) is provided with multiple sets of auxiliary blades (170) fixed to the top of the impeller body (100). Each set of auxiliary blades (170) has three sets of conical plates (171) fixed on its outer surface.

2. The pulverizing impeller of a fan-driven coal mill according to claim 1, characterized in that: The impeller body (100) has a discharge hole (101) at the top center position, and the bottom discharge hole (101) of the base cylinder (150) extends to the bottom of the impeller body (100).

3. The pulverizing impeller of a fan-driven coal mill according to claim 2, characterized in that: The outer wall of the base cylinder (150) is fixed with multiple sets of inclined positioning rods (160), and the end of each set of positioning rods (160) is fixed to the bottom of the impeller body (100).

4. The pulverizing impeller of a fan-driven coal mill according to claim 1, characterized in that: The curved inner wall of the base cylinder (150) is provided with two sets of keyways (151) extending to the upper and lower ends of the base cylinder (150).

5. A fan-driven coal mill pulverizing impeller according to claim 1, characterized in that: Multiple sets of the auxiliary blades (170) are arranged in a ring array on the top of the impeller body (100). Each set of the auxiliary blades (170) is inclined, and the inclination angle of the auxiliary blades (170) is opposite to that of the main blades (120).

6. The pulverizing impeller of a fan-driven coal mill according to claim 1, characterized in that: The top of the serrated cutter (140) has a toothed groove with a small center and a large edge.

7. A fan-driven coal mill pulverizing impeller according to claim 1, characterized in that: The bottom of the impeller body (100) is fitted with bolts (102) at positions corresponding to each set of main blades (120), and the bolts (102) extend through the impeller body (100) into the main blades (120). The bottom of the main blades (120) is provided with threaded holes that match the bolts (102).

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