A sorting device for molybdenum disulfide ultrafine powder

Abstract

The present application relates to the technical field of powder material grading treatment, and particularly relates to a superfine molybdenum disulfide powder sorting device. The superfine molybdenum disulfide powder sorting device comprises a screening shell, a feeding channel and a return material channel are connected to the bottom of the screening shell, a fine powder recovery channel is arranged on the top wall of the screening shell, a grading wheel is arranged in the screening shell, and a power mechanism for driving the grading wheel to rotate is arranged on the top of the screening shell. The grading wheel comprises a lower support plate, an upper support plate and blades distributed between the lower support plate and the upper support plate in the circumferential direction, the blades comprise first blades and second blades which are alternately distributed, the length of the second blade is greater than that of the first blade, and the windward surface of the outer end portion of the second blade is arc-shaped. A flow guide cover is arranged around the outer portion of the grading wheel. Through the unique structure of the grading wheel, the ingenious design of the variable-speed air duct of the flow guide cover and the like, accurate separation of coarse and fine particles is realized, the fine powder recovery rate is greatly improved, the stability of equipment rotation is enhanced, the wear of components is reduced, and long-term stable operation is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of powder material grading treatment, and in particular to a molybdenum disulfide superfine powder sorting device. BACKGROUND

[0002] Molybdenum disulfide in the form of superfine powder can significantly improve the performance and quality of related products due to its unique physical and chemical properties, such as greater specific surface area, higher activity, and better lubrication performance, thereby meeting the needs of high-end application fields.

[0003] At present, air flow grading technology is widely used in the field of superfine powder sorting. The basic principle is to use the difference in the settling velocity of particles in the air flow to achieve grading. The grading wheel, as the core component of the air flow grading device, its structural design plays a decisive role in the sorting effect. The existing grading wheel blade design is mostly simple, usually using a single shape and size of blade, which cannot form a reasonable and stable velocity field around the grading wheel. This leads to ineffective separation of coarse and fine particles during the sorting process, resulting in low fine powder recovery rate.

[0004] In the prior art, the patent document with the authorization announcement number CN110788004B discloses a curved and twisted blade grading impeller of a vortex air classifier, which comprises curved and twisted blades. A plurality of curved and twisted blades are arranged in a ring shape at equal intervals around the geometric central axis of the grading impeller to form an air flow channel. The curved and twisted blades are combined with radial bending and axial twisting. The blade structure with radial bending and axial twisting improves the aerodynamic performance of the curved and twisted blade channel, improves the grading precision of the vortex air classifier for superfine powder, and reduces the lower limit of grading and energy loss. However, due to the characteristics of molybdenum disulfide, such as easy agglomeration, the grading wheel with the above structure cannot assist in separating agglomerated particles. During use, misclassification may occur due to the difference in settling velocity between agglomerates and single particles, and the recovery rate of fine powder is reduced to some extent. SUMMARY

[0005] The present application provides a molybdenum disulfide superfine powder sorting device to solve the technical problem of low fine powder recovery rate caused by easy agglomeration and other phenomena during molybdenum disulfide grading and sorting in the prior art.

[0006] To solve the above problems, the molybdenum disulfide superfine powder sorting device provided by the present application adopts the following technical scheme:

[0007] The application relates to a screening shell, a bottom of the screening shell is communicated with a feeding channel and a return material channel, a top wall of the screening shell is provided with a fine powder recovery channel, a classification wheel is arranged in the screening shell, a power mechanism for driving the classification wheel to rotate is arranged at the top of the screening shell; the classification wheel comprises a lower supporting plate, an upper supporting plate and blades distributed between the lower supporting plate and the upper supporting plate in a circumferential direction, the blades comprise first blades and second blades which are alternately distributed, the length of the second blade is greater than that of the first blade, the windward surface of the outer end portion of the second blade is arc-shaped, and the width of one end of the outer end portion close to the center of the classification wheel is greater than that of the other end.

[0008] A guide connecting piece is rotationally arranged at the top of the upper supporting plate, the guide connecting piece is fixed to the top of the screening shell, and a labyrinth seal structure is formed between the upper supporting plate and the guide connecting piece.

[0009] A drainage cover is arranged outside the classification wheel, the drainage cover comprises guide plates which are distributed in a circumferential direction and are spaced apart from each other, the guide plates are in a trapezoidal shape in a top view, the width of one end of the guide plate close to the classification wheel is greater than that of the other end, and a variable-speed air channel is formed between adjacent guide plates.

[0010] According to the technical scheme, the outer end portion of the second blade is more than that of the first blade, so that the second blade forms a high-speed area during operation, the particles with separation are thrown to the gap between the second blades at high speed, and the agglomeration phenomenon is reduced, and the separation of fine powder is further realized. The first blade forms a low-speed area, so that the coarse particles are further settled, the fine powder is fully exposed to the centrifugal field, and the recovery rate of the fine powder is improved. In addition, the windward surface of the outer end portion of the second blade is arc-shaped, which can reduce the airflow impact loss, reduce the turbulence intensity, and avoid the escape of fine powder particles caused by the large vortex intensity at the end of the first blade and the second blade. The variable-speed air channel formed by the drainage cover has low flow velocity at the inlet, so that the coarse particles are more easily separated, high flow velocity areas are formed at the outlets, and the high-speed areas around the classification wheel are adapted to form a stable velocity gradient.

[0011] Further, the second blade comprises a body part which is consistent with the structure of the first blade, wherein the width of the windward surface of the body part is L1, the width of the windward surface of the outer end portion 233 is L2, and L1:L2 is (10-12):1.

[0012] Further, the included angle alpha between the inner end of the adjacent first blade and second blade and the center of the classification wheel is 6-7 degrees.

[0013] Further, the windward surface of the first blade is provided with vertically spaced disturbance grooves, and the disturbance grooves are arranged on the windward surface of the first blade away from the center of the classification wheel.

[0014] Further, the first blade has a thickness of 8-10mm, and the spoiler groove has a depth of 0.5-2mm.

[0015] With the above technical scheme, when the grading wheel rotates, the spoiler groove on the windward surface of the first blade can change the flow state of the airflow on the blade surface, so that the airflow in this region generates local turbulence, further disperses the fine powder, and improves the recovery rate and purity of the fine powder.

[0016] Further, the labyrinth seal structure comprises annular grooves arranged on the upper end surface of the upper support plate, the annular grooves are n annular grooves distributed along the radial direction of the grading wheel, and n is greater than or equal to 2, and the bottom surface of the guide connecting piece is provided with annular protrusions corresponding to the annular grooves.

[0017] With the above technical scheme, the labyrinth seal structure forms multiple sealing barriers by arranging n (n≥2) annular grooves distributed along the radial direction of the grading wheel on the upper end surface of the upper support plate, and arranging corresponding annular protrusions on the bottom surface of the guide connecting piece. The cooperation of each annular groove and annular protrusion can prevent the material from passing through, and increase the tortuosity and length of the path. In addition, the cooperation of the annular groove and the annular protrusion can improve the stability of the rotating cooperation between the upper support plate and the guide connecting piece, and improve the stability of the rotation of the grading wheel.

[0018] Further, the angle β between the bottom of the adjacent guide plate and the center of the grading wheel is 12°-14°, and β=2α.

[0019] Further, the feeding channel comprises a feeding pipe and a first material guide hopper connected to the top end of the feeding pipe, and the top end of the first material guide hopper is connected to the bottom of the screening shell through a flange.

[0020] Further, the feeding channel comprises a feeding pipe and a first material guide hopper connected to the top end of the feeding pipe, and the top end of the first material guide hopper is connected to the bottom of the screening shell through a flange.

[0021] Further, the top end of the second material guide hopper is provided with an annular plate, the bottom end of the guide plate is fixed to the annular connecting plate, the annular connecting plate and the annular plate are detachably connected through bolts, and the top end of the guide plate is detachably connected to the top of the screening shell.

[0022] With the above technical scheme, the guide plate can be detachably installed, which facilitates subsequent cleaning and maintenance operations.

[0023] The beneficial effects of the provided molybdenum disulfide superfine powder sorting device are:

[0024] 1、The first blade and the second blade are alternately distributed in the application, the second blade has an outer end part, forms a high-speed area during operation, throws particles into the gap, reduces agglomeration to help fine powder separation; the first blade forms a low-speed area, promotes coarse particle sedimentation, exposes fine powder to the centrifugal field, and improves the recovery rate. The windward surface of the outer end part of the second blade is arc-shaped, which can reduce airflow impact loss, reduce turbulence intensity, and prevent fine powder from escaping.

[0025] 2、In the application, the spoiler groove can change the flow state of the airflow on the surface of the first blade, so that the airflow in this area produces local turbulence. This local turbulence can break the agglomeration between particles, promote further dispersion of fine powder, increase the exposure opportunity of fine powder in the centrifugal field, and thus improve the recovery rate of fine powder.

[0026] 3、In the application, the variable-speed air duct formed by the flow guide cover has low flow rate at the inlet, so that coarse particles are more easily separated, and a high flow rate area is formed at the outlet, which is adapted to the high-speed area at the periphery of the classification wheel, forming a stable velocity gradient. The variable-speed air duct formed on the flow guide cover is equivalent to pre-treating the airflow entering the classification wheel, and the two cooperate with each other to fully exert the classification ability of the classification wheel and improve the recovery rate of fine powder. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like reference numerals refer to like elements throughout. In the drawings:

[0028] Figure 1 is a structural schematic view of a molybdenum disulfide superfine powder sorting device of the present application;

[0029] Figure 2 is a front view of a molybdenum disulfide superfine powder sorting device of the present application;

[0030] Figure 3 is a schematic view of the internal structure of a molybdenum disulfide superfine powder sorting device of the present application;

[0031] Figure 4 is Figure 3 is a partial enlarged view of region A in the middle;

[0032] Figure 5 is Figure 3 is a partial enlarged view of region B in the middle;

[0033] Figure 6 is a top view of the classification wheel in the present application;

[0034] Figure 7 is Figure 6 is a partial enlarged view of region C in the middle;

[0035] Figure 8 Structure diagram of first blade in the application;

[0036] Figure 9 Plan view of guide plate distribution in the application.

[0037] Explanation of reference signs:

[0038] 1, screening shell; 11, feeding channel; 111, feeding pipe; 112, first guide hopper; 12, return material channel; 121, second guide hopper; 1211, annular plate; 122, guide pipe; 13, fine powder recovery channel; 2, classification wheel; 21, lower support plate; 22, upper support plate; 221, annular groove; 23, blade; 231, first blade; 232, second blade; 233, outer end; 234, spoiler groove; 3, guide connecting piece; 4, flow guide cover; 41, guide plate; 42, variable speed air duct; 43, annular connecting plate. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. It should be known by those skilled in the art that the embodiments described below are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0040] Any number of elements in the drawings is used for illustration, not limitation, and any naming is only used for distinction, not having any limiting meaning.

[0041] The principles and spirits of the application will be explained in detail below with reference to several representative embodiments of the application.

[0042] An embodiment of a molybdenum disulfide superfine powder sorting device provided by the application:

[0043] As shown in Figures 1 to 9 ,

[0044] The sorting device comprises a screening shell 1, the bottom of the screening shell 1 is provided with a feeding channel 11 and a return material channel 12, the top wall of the screening shell 1 is provided with a fine powder recovery channel 13, the screening shell 1 is provided with a classification wheel 2, and the top of the screening shell 1 is provided with a power mechanism for driving the classification wheel 2 to rotate.

[0045] In specific work, the material to be sorted enters through the feeding channel 11, and after the classification of the classification wheel 2, the fine powder is collected at the fine powder recovery channel 13, and the coarse particles are recovered at the return material channel 12.

[0046] In the embodiment, the grading wheel 2 comprises a lower support plate 21, an upper support plate 22, and blades 23 distributed between the lower support plate 21 and the upper support plate 22 in the circumferential direction, the blades 23 comprising first blades 231 and second blades 232 alternately distributed, the length of the second blades 232 being greater than that of the first blades 231, the windward surface of the outer end portion 233 on the second blades 232 being arc-shaped, and the width of the outer end portion 233 near one end of the center of the grading wheel 2 being smaller than that of the other end.

[0047] The second blades 232 comprise a body portion consistent with the structure of the first blades 231, wherein the width of the windward surface of the body portion is L1, and the width of the windward surface of the outer end portion 233 is L2, and L1:L2 is 10:1.

[0048] The second blades 232 comprise a body portion consistent with the structure of the first blades 231, wherein the width of the windward surface of the body portion is L1, and the width of the windward surface of the outer end portion 233 is L2, and L1:L2 is 10:1.

[0049] Furthermore, the inner end of the adjacent first blades 231 and second blades 232 and the center of the grading wheel 2 form an included angle α of 6°.

[0050] The included angle design herein can ensure the reasonable distribution of the first blades 231 and the second blades 232 in the circumferential direction of the grading wheel 2. On the one hand, the suitable included angle makes enough space for the airflow and particles to pass between the first blades 231 and the second blades 232, avoiding airflow obstruction due to the excessive density of the first blades 231 and the second blades 232, and affecting the grading effect; on the other hand, the included angle can also ensure that the first blades 231 and the second blades 232 have enough action area on the airflow and particles, so that the low-speed area formed by the first blades 231 and the high-speed area formed by the second blades 232 can fully play their roles, allowing the coarse particles to fully settle in the low-speed area, and the fine powder to be fully exposed to the centrifugal field in the high-speed area, thereby improving the accuracy of the separation.

[0051] In the embodiment, the windward surface of the first blades 231 is provided with vertically spaced disturbance grooves 234, and the disturbance grooves 234 are arranged on the windward surface of the first blades 231 away from the center of the grading wheel 2.

[0052] The thickness of the first blades 231 is 8 mm, and the depth of the disturbance grooves 234 is 1 mm.

[0053] When the classification wheel 2 rotates, the spoiler groove 234 can change the flow state of the airflow on the surface of the first blade 231, causing local turbulence of the airflow in this area. This local turbulence can break the agglomeration between particles, promote further dispersion of fine powder, increase the exposure opportunity of fine powder in the centrifugal field, and thus improve the recovery rate of fine powder. At the same time, the reasonable thickness of the first blade 231 ensures the strength of the structure, which can withstand the impact of airflow and particles while maintaining the structural stability of the spoiler groove 234, ensuring its good spoiler effect.

[0054] Furthermore, this local turbulence can reduce the probability of material adhering to the first blade 231 or the second blade 232.

[0055] In this embodiment, the top of the upper support plate 22 is rotationally fitted with a guide connecting piece 3, which is fixed to the top of the screening shell 1. A labyrinth seal structure is formed between the upper support plate 22 and the guide connecting piece 3.

[0056] Specifically, the labyrinth seal structure includes annular grooves 221 provided on the upper end surface of the upper support plate 22, and the bottom surface of the guide connecting piece 3 is provided with annular protrusions corresponding to the annular grooves 221.

[0057] On the one hand, the cooperation of each annular groove 221 and annular protrusion can prevent material from passing through, increasing the degree of tortuosity and length of the path. On the other hand, the cooperation of the annular groove and the annular protrusion can improve the stability of the rotational fit between the upper support plate and the guide connecting piece, and improve the stability of the rotation of the classification wheel.

[0058] In this embodiment, a flow guide cover 4 is provided outside the classification wheel 2, and the flow guide cover 4 includes guide plates 41 spaced apart along the outer periphery of the classification wheel 2. The guide plates 41 have a trapezoidal shape in plan view, and the width of one end of the guide plates 41 near the classification wheel 2 is greater than the width of the other end. Variable speed air channels 42 are formed between adjacent guide plates 41.

[0059] The variable speed air channels formed by the flow guide cover 4 have low flow velocity at the inlet, making it easier for coarse particles to detach, and high flow velocity at the outlet, which is adapted to the high-speed area around the classification wheel 2, forming a stable velocity gradient.

[0060] The variable speed air channels formed by the flow guide cover 4 are equivalent to pre-treatment of the airflow entering the classification wheel 2. Reasonable distribution of airflow velocity enables the classification wheel 2 to more effectively utilize centrifugal force and airflow drag to classify particles. The high-speed airflow can better carry fine particles, and the low-speed area is conducive to the settling of coarse particles. The two work together to fully utilize the classification ability of the classification wheel 2 and improve the recovery rate of fine powder.

[0061] Wherein, the angle β between the bottom of the adjacent guide plate 41 and the center of the classification wheel 2 is 12°, wherein β = 2α.

[0062] The classification wheel 2 rotates to form a specific speed field around it, and the design of β = 2α makes the variable-speed air duct 42 formed by the flow guide cover 4 adapt to the speed field of the classification wheel 2. In the high-speed area of the classification wheel 2, a high-flow area is also formed at the outlet of the variable-speed air duct 42, and the two areas cooperate with each other to enhance the force of the airflow on the particles, so that the particles can be better separated according to the particle size. At the same time, this matching relationship also helps to reduce the energy loss between the airflow and the classification wheel 2, and improves the energy utilization efficiency of the entire separation system.

[0063] In this embodiment, the feed channel 11 includes a feed pipe 111 and a first material guide hopper 112 connected to the top end of the feed pipe 111. The top end of the first material guide hopper 112 is connected to the bottom of the screening shell 1 by a flange.

[0064] Wherein, the return material channel 12 includes a second material guide hopper 121 which is sleeved in the first material guide hopper 112, and the bottom end of the second material guide hopper 121 is provided with a material guide pipe 122 which extends out of the side wall of the feed pipe 111.

[0065] Further, the top end inner wall of the second material guide hopper 121 is provided with an annular plate 1211, the bottom end of the guide plate 41 is fixed on the annular connecting plate 43, the annular connecting plate 43 and the annular plate 1211 are detachably connected by bolts, and the top end of the guide plate 41 is detachably connected to the top of the screening shell 1. Specifically, the top end of the guide plate 41 is provided with an auxiliary ring plate for connecting to the top of the screening shell 1. The flow guide cover 4 can be detached, which is convenient for later maintenance and cleaning.

[0066] The material to be separated enters the first material guide hopper 112 through the feed pipe 111, and after the action of the flow guide cover 4, the material in the first material guide hopper 112 enters between the flow guide cover 4 and the classification wheel 2. The coarse particle material cannot pass through the classification wheel 2 for recovery, and then slowly settles into the second material guide hopper 121 and is discharged through the material guide pipe 122.

[0067] According to the above description of the present specification, those skilled in the art can also understand that the terms used, such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0068] Also in the description of the present specification, the meaning of "a plurality of" is at least two, for example, two, three or more, etc., unless explicitly specifically limited otherwise.

Claims

1. A superfine molybdenum disulfide powder sorting device, comprising a screening shell (1), a feed channel (11) and a return material channel (12) are communicated at the bottom of the screening shell (1), a superfine powder recovery channel (13) is arranged on the top wall of the screening shell (1), a grading wheel (2) is arranged in the screening shell (1), and a power mechanism for driving the grading wheel (2) to rotate is arranged at the top of the screening shell (1), characterized in that, The grading wheel (2) comprises a lower support plate (21), an upper support plate (22), and blades (23) distributed between the lower support plate (21) and the upper support plate (22) in a circumferential direction, the blades (23) comprise alternately distributed first blades (231) and second blades (232), the length of the second blades (232) is greater than that of the first blades (231), the windward surface of an outer end (233) of the second blades (232) is arc-shaped, and the width of the outer end (233) near one end of the center of the grading wheel (2) is greater than that of the other end. A top portion of the upper support plate (22) is rotationally connected with a guide connecting piece (3), the guide connecting piece (3) is fixed to the top portion of the screening shell (1), and a labyrinth seal structure is formed between the upper support plate (22) and the guide connecting piece (3). An outer portion of the grading wheel (2) is provided with a flow guide cover (4), the flow guide cover (4) comprises guide plates (41) distributed in a circumferential direction and spaced apart from each other along the outer portion of the grading wheel (2), a top view of the guide plates (41) is trapezoidal, the width of one end of the guide plates (41) near the center of the grading wheel (2) is greater than that of the other end, and variable-speed air channels (42) are formed between adjacent guide plates (41).

2. The molybdenum disulfide ultrafine powder sorting device according to claim 1, wherein, The second blades (232) comprise a body part consistent with the structure of the first blades (231), wherein the width of the windward surface of the body part is L1, the width of the windward surface of the outer end (233) is L2, and L1:L2 is (10-12):

1.

3. The molybdenum disulfide ultrafine powder sorting device according to claim 2, wherein, An included angle α between the inner ends of adjacent first blades (231) and second blades (232) and the center of the grading wheel (2) is 6°-7°.

4. The molybdenum disulfide ultrafine powder sorting device according to claim 1, wherein, A vertical direction is provided with turbulence grooves (234) distributed on the windward surface of the first blades (231), the turbulence grooves (234) are arranged on the windward surface of the first blades (231) away from the center of the grading wheel (2).

5. The molybdenum disulfide ultrafine powder sorting device according to claim 4, wherein The thickness of the first blades (231) is 8-10 mm, and the depth of the turbulence grooves (234) is 0.5-2 mm.

6. The molybdenum disulfide ultrafine powder sorting device of claim 1, wherein, The labyrinth seal structure comprises annular grooves (221) arranged on the upper end surface of the upper support plate (22), the annular grooves (221) are n annular grooves arranged in a radial direction and spaced apart from each other, and n≥2, and the bottom surface of the guide connecting piece (3) is provided with annular protrusions corresponding to the annular grooves (221).

7. The molybdenum disulfide ultrafine powder sorting device according to claim 3, wherein An included angle β between the bottom portions of adjacent guide plates (41) and the center of the grading wheel (2) is 12°-14°, and β=2α.

8. The molybdenum disulfide ultrafine powder sorting device of claim 1, wherein, The feeding channel (11) comprises a feeding pipe (111) and a first guide hopper (112) connected and communicated with the top end of the feeding pipe (111), and the top end of the first guide hopper (112) is connected with the bottom of the screening shell (1) through a flange.

9. The molybdenum disulfide ultrafine powder sorting device according to claim 8, wherein, The return material channel (12) comprises a second guide hopper (121) sleeved in the first guide hopper (112), and the bottom end of the second guide hopper (121) is provided with a guide pipe (122) extending out of the side wall of the feeding pipe (111).

10. The molybdenum disulfide ultrafine powder sorting device of claim 9, wherein, The inner wall of the top end of the second material guide hopper (121) is provided with an annular plate (1211), the bottom end of the guide plate (41) is fixed on an annular connecting plate (43), the annular connecting plate (43) and the annular plate (1211) are detachably connected through bolts, and the top end of the guide plate (41) is detachably connected with the top of the screening shell (1).

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