Mechanical mill grading wheel sprayed with tungsten carbide

Abstract

The utility model belongs to the technical field of grading wheels, and particularly relates to a mechanical mill grading wheel sprayed with tungsten carbide, which comprises two flange plates arranged oppositely, a rotor opening arranged at the circle center of the flange plates and an impeller assembly arranged between the two flange plates, the impeller assembly comprises a plurality of grading blades connected between the two flange plates, and the grading blades are arranged in an antiparallelogram structure, so that the contact area between the grading blades and material particles is increased by designing the grading blades in the antiparallelogram structure; according to the grading wheel, the bearing capacity of the grading blades to material particles is effectively improved, the abrasion risk is reduced, friction of small-particle materials to the narrow face is reduced through the gap structure with the narrow inside and the wide outside, the grading blades are further protected, meanwhile, circulation of airflow is accelerated through the structure, the grading efficiency of the grading wheel is improved, and the grading efficiency of the grading wheel is improved. The wear resistance of the grading blade is further improved; and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of classification wheels, and particularly relates to a mechanical grinding classification wheel sprayed with tungsten carbide. Background Technique

[0002] The classification wheel is a device used for sorting the particle sizes of powder particles. Under the action of the strong centrifugal force generated by the high-speed rotating classification turbine, the coarse and fine materials moving to the classification area along with the upward air flow are separated. The fine particles meeting the particle size requirements pass through the classification wheel and enter the next component to be collected, while the coarse particles fall to the crushing area to continue crushing.

[0003] In the prior art, the classification blades are vertically fixed between two flange plates at a certain interval. When the classification wheel starts to separate the materials, the smaller material particles will pass through these gaps under the action of centrifugal force and enter the next process, while the larger material particles will be blocked by the blades inside the classification wheel. However, in actual use of the above structure, since the existing classification blades are usually slender rectangular thin plates, the contact area with the material particles is small. When the classification blades are working, they will be impacted by high-speed powder particles and air flow, so the classification blades are particularly vulnerable to wear. Content of the Utility Model

[0004] In view of this, the utility model provides a mechanical grinding classification wheel sprayed with tungsten carbide, and its purpose is to design classification blades in an equilateral trapezoid structure, which not only increases the contact area between the classification blades and the material particles, effectively improves the bearing capacity of the classification blades for the material particles, reduces the wear risk, but also reduces the friction of small particle materials on the narrow surface through the inner-narrow and outer-wide gap structure, further protecting the classification blades. At the same time, this structure also accelerates the air flow, improves the classification efficiency of the classification wheel, further improves the wear resistance of the classification blades and extends their service life.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A mechanical grinding classification wheel sprayed with tungsten carbide includes two oppositely arranged flange plates, a rotor opening provided at the center of the flange plates, and an impeller assembly provided between the two flange plates. The impeller assembly includes a number of classification blades connected between the two flange plates. The feature is that the classification blades are arranged in an equilateral trapezoid structure, including a wide surface and a narrow surface. Among them, the wide surface faces the inner side of the flange plate, and the narrow surface faces the outer side of the flange plate.

[0007] As a preferred technical solution, streamlined convex patterns are provided on the two equilateral surfaces of the classification blades, and the two ends of the convex patterns face the wide surface and the narrow surface respectively.

[0008] Further, the impeller assembly further includes a fixing collar for fixing the classification blades, wherein the upper and lower ends of the classification blades are connected to two oppositely arranged fixing collars.

[0009] Further, the flange and the fixing collar are provided with corresponding screw holes.

[0010] Further, a clamping groove corresponding to the fixing collar is provided inside the flange.

[0011] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0012] By designing the classification blades in an equilateral trapezoid structure, not only the contact area between the classification blades and the material particles is increased, the bearing capacity of the classification blades for the material particles is effectively improved, the wear risk is reduced, but also the friction of the small particle materials against the narrow surface is reduced through the narrow-inner and wide-outer gap structure, further protecting the classification blades. At the same time, this structure also accelerates the air flow, improves the classification efficiency of the classification wheel, further improves the wear resistance of the classification blades and extends their service life. Description of the Drawings

[0013] The present utility model will be described by way of examples with reference to the accompanying drawings, wherein:

[0014] Figure 1 is a schematic structural diagram of a mechanical grinding classification wheel sprayed with tungsten carbide provided by the present utility model;

[0015] Figure 2 is a schematic structural diagram of the classification blades provided by the present utility model;

[0016] Figure 3 is a schematic structural diagram of the fixing collar provided by the present utility model;

[0017] Figure 4 is a schematic internal structural diagram of the flange provided by the present utility model.

[0018] Flange - 1; Rotor opening - 2; Screw hole - 3; Impeller assembly - 4; Classification blade - 5; Wide surface - 6; Narrow surface - 7; Fixing collar - 8; Clamping groove - 9. Detailed Embodiments

[0019] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Example 1

[0021] In the prior art, the classification blades are vertically installed between two flange plates at a certain interval. When the classification wheel performs the material separation operation, it will start to rotate. Under the action of centrifugal force, small material particles can pass through the gaps between these blades and smoothly enter the next processing link; while the larger material particles are blocked by the blades and remain inside the classification wheel. However, in actual applications, considering that the current classification blades mostly adopt the form of slender rectangular sheets, the contact area with the material particles is relatively narrow. Therefore, when the classification blades are impacted by high-speed powder particles and air flow during operation, the risk of wear is relatively high.

[0022] Therefore, in order to solve the problem that the existing classification blades are extremely prone to wear and are not conducive to the continuous use of the classification wheel, and to achieve the function of improving the bearing capacity of the classification blades for air flow dust and reducing the wear degree of the classification wheel, the present utility model discloses a mechanical grinding classification wheel sprayed with tungsten carbide. Refer to Figure 1 - Figure 2 , including two mutually opposite flange plates 1, a rotor opening 2 opened at the center of the flange plate 1, and an impeller assembly 4 arranged between the two flange plates 1. The impeller assembly 4 includes a plurality of classification blades 5 connected between the two flange plates 1. Specifically, the classification blade 5 is arranged in an equilateral trapezoid structure, including a wide surface 6 and a narrow surface 7. Among them, the wide surface 6 faces the inner side of the flange plate 1, and the narrow surface 7 faces the outer side of the flange plate 1;

[0023] In this embodiment, by setting the classification blade 5 into an isosceles trapezoid, and the wide surface 6 faces the inner side of the flange plate 1 and the narrow surface 7 faces the outer side of the flange plate 1. Therefore, when the classification wheel separates the material, the wide surface 6 facing the inner side of the flange plate 1 will block the larger material particles, thereby expanding the contact area between the classification blade 5 and the large particle material, while improving the bearing effect of the classification blade 5 on the particles, and also improving the blocking efficiency of the large particle material;

[0024] At the same time, through the above structure, the gap between two adjacent classification blades 5 can be narrow inside and wide outside. When small particles enter the gap, due to the gradual widening of the gap, the contact between these small particle materials and the narrow surface 7 can be reduced, thereby reducing the particle friction received by the narrow surface 7 and further improving the protection effect on the classification blade 5;

[0025] In addition, through the gap structure from narrow to wide, the air flow can accelerate the circulation after entering the gap, so as to achieve the purpose that the small materials can accelerate through the gap and enter the next process, thereby improving the classification efficiency of the classification wheel.

[0026] To sum up, by adopting the above scheme, the beneficial effects of the present utility model are

[0027] By designing the grading blade 5 in an equilateral trapezoid structure, not only is the contact area between the grading blade 5 and the material particles increased, effectively improving the bearing capacity of the grading blade 5 for the material particles, reducing the wear risk, but also through the narrow-inner and wide-outer gap structure, the friction of small particle materials against the narrow surface 7 is reduced, further protecting the grading blade 5. At the same time, this structure also accelerates the air flow, improves the grading efficiency of the grading wheel, further enhances the wear resistance of the grading blade and extends its service life.

[0028] Embodiment 2

[0029] On the basis of Embodiment 1, the present utility model further includes convex stripes for making the air flow smoothly. Specifically, streamline convex stripes are provided on two equilateral surfaces of the grading blade 5, and two ends of the convex stripes respectively face the wide surface 6 and the narrow surface 7.

[0030] In this embodiment, through the streamline convex stripe structure, a certain directivity is formed on the surface of the grading blade 5. When the air flow passes through the grading blade 5, the convex stripes can effectively guide the air flow to flow along a specific direction, avoiding the disorder and vortex phenomenon of the air flow. At the same time, the streamline convex stripes can also reduce the impact force of the air flow on the grading blade 5, further reducing the wear degree of the grading blade 5. In addition, by accelerating the flow rate of the air flow and stabilizing the flow direction of the air flow, the small materials thrown out can pass through the gaps between the grading blades 5 faster, further reducing the friction generated by the materials on the narrow surface 7.

[0031] Embodiment 3

[0032] On the basis of any one of Embodiments 1 to 2, in the prior art, the grading wheel is usually set in an integral structure. When the grading blade 5 is worn and needs to be replaced, the staff usually needs to replace the entire grading wheel, so the maintenance cost is relatively high. Therefore, to solve the above problems and achieve the purpose of reducing the maintenance cost, the present utility model further includes a fixing collar 8. Refer to Figure 3 - Figure 4 , specifically, the impeller assembly 4 further includes a fixing collar 8 for fixing the grading blade 5. Among them, the upper and lower ends of the grading blade 5 are fixed on two relatively arranged fixing collars 8, and the flange 1 and the fixing collar 8 are provided with corresponding screw holes 3.

[0033] By fixing the grading blade 5 on the fixed collar 8 and then connecting the flange 1 to the fixed collar 8, the grading blade 5 can be replaced individually without replacing the entire grading wheel, thus greatly reducing the maintenance cost. Specifically, during use, when the grading blade 5 is worn, the operator only needs to remove the fixed collar 8 from the flange 1, then remove the worn grading blade 5 from the fixed collar 8, install a new grading blade 5 on the fixed collar 8, and finally reconnect the fixed collar 8 to the flange 1. Such a design not only improves the convenience of maintenance but also reduces the maintenance cost;

[0034] In this embodiment, the screw hole 3 includes a threaded through-hole and a threaded blind-hole. Specifically, on the side of the fixed collar 8 in contact with the grading blade 5, there is a threaded through-hole, and at both ends of the grading blade 5, there are threaded blind-holes corresponding to the threaded through-hole, enabling the grading blade 5 to be fixed on the fixed collar 8 by bolts, which facilitates the installation and removal of the grading blade 5.

[0035] Furthermore, there is a threaded through-hole on the flange 1, and on the side of the fixed collar 8 facing the flange 1, there is a threaded blind-hole corresponding to the threaded through-hole;

[0036] With the above structure, the fixed collar 8 can be fixed on the flange 1 by bolts.

[0037] Furthermore, there is a card slot 9 corresponding to the fixed collar 8 inside the flange 1;

[0038] The provision of the card slot 9 enables the fixed collar 8 to be more stably fitted inside the flange 1, thereby improving the stability of the entire impeller assembly 4.

[0039] In one embodiment, a gasket is provided between the flange 1 and the fixed collar 8;

[0040] By providing the gasket, it can effectively prevent a gap from appearing between the flange 1 and the fixed collar 8 due to the impact of air flow or material particles during the operation of the grading wheel, thereby preventing the leakage of air flow or material particles and ensuring the normal operation of the grading wheel. The material of the gasket can be selected according to actual requirements, such as materials with good elasticity and sealing performance like rubber and silica gel.

[0041] Embodiment Four

[0042] On the basis of any one of Embodiments One to Three, in order to improve the surface hardness of the grading wheel and extend its service life, the surfaces of the impeller assembly 4 and the flange 1 are both coated with a tungsten carbide coating. Among them, the tungsten carbide coating is applied by supersonic spraying, and an SX - 8000 fuel - type supersonic spraying device can be used for spraying, but it is not limited to this.

[0043] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0044] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mechanical grinding classifying wheel sprayed with tungsten carbide, comprising two flanges (1) disposed opposite to each other, a rotor port (2) provided at the center of the flanges (1), and an impeller assembly (4) disposed between the two flanges (1), wherein the impeller assembly (4) comprises a plurality of classifying blades (5) connected between the two flanges (1), characterized in that: The grading blade (5) is arranged in an equilateral trapezoidal structure, comprising a wide surface (6) and a narrow surface (7), wherein the wide surface (6) faces the inner side of the flange (1) and the narrow surface (7) faces the outer side of the flange (1).

2. The mechanical grinding and classifying wheel sprayed with tungsten carbide according to claim 1, characterized in that: Streamlined convex patterns are provided on two equilateral surfaces of the grading blade (5), and the two ends of the convex patterns face the wide surface (6) and the narrow surface (7) respectively.

3. The mechanical grinding and classifying wheel sprayed with tungsten carbide according to claim 1, characterized in that: The impeller assembly (4) further comprises a fixing collar (8) for fixing the grading blades (5), wherein the upper and lower ends of the grading blades (5) are connected to two fixing collars (8) arranged opposite to each other.

4. The mechanical grinding and classifying wheel sprayed with tungsten carbide according to any one of claims 1 or 3, characterized in that: The flange (1) and the fixing collar (8) are provided with screw holes (3) corresponding to each other.

5. The mechanical grinding and classifying wheel sprayed with tungsten carbide according to claim 4, characterized in that: A clamping groove (9) corresponding to the fixing collar (8) is provided inside the flange (1).

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