Superfine powder airflow crushing and circulating grading device

Abstract

The utility model relates to the technical field of powder material jet milling and grading, in particular to a superfine powder jet milling and circulating grading device. Comprising a grading chamber, a crushing chamber and a flow guide assembly, the grading chamber is positioned at the top of the crushing chamber and is communicated with the crushing chamber; the lower portion of the crushing chamber working cavity is provided with a crushing area used for crushing fed materials, the upper portion of the crushing chamber working cavity is provided with a grading area, and a grading wheel is arranged in the grading area and used for guiding powder obtained after the fed materials are crushed into the grading chamber. The flow guide assembly is installed in the crushing chamber, a flow guide channel used for airflow to drive powder to flow is defined in the crushing chamber, the top of the flow guide channel communicates with the grading wheel of the grading area of the crushing chamber, and the bottom of the flow guide channel communicates with the crushing area of the crushing chamber. The device not only can improve the material crushing efficiency and the productivity, but also reduces the condition that a large amount of coarse powder abrades blades when the grading wheel rotates at a high speed, thereby prolonging the service life of equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to powder material airflow crushing and grading technical field especially relates to superfine powder airflow crushing circulating grading device. BACKGROUND

[0002] At present, in sodium ion battery negative electrode material, the biomass hard carbon material is widely sourced, has simple synthesis process, environmental protection and reproduction, has certain economic benefits, is the high-quality carbon source for sodium ion battery negative electrode material. The particle size, purity and particle size distribution of the superfine powder product are also correspondingly improved in actual production. The airflow classification step is to meet the production capacity requirement, crush the powder material to the appropriate particle size and then perform classification and conveying.

[0003] The existing airflow crushing and grading technology is jointly acted by the centripetal force generated by the rotating classification wheel, negative pressure suction, compressed air from bottom to top and the gravity of the powder itself. The fine powder of qualified particle size passes through the gap between the classification wheel blades and is conveyed to the next process by negative pressure. The coarse powder that does not meet the requirements cannot return to the crushing area in time for further crushing, and the airflow continuously enriches the coarse powder outside the classification wheel.

[0004] This will cause the airflow to continuously wear the blades outside the classification wheel, affecting the service life of the classification wheel. At the same time, a large amount of coarse powder cannot return to the crushing area in time for crushing, the crushing efficiency is low, the fine powder yield is low, and the production capacity is affected. In addition, the airflow with a large amount of coarse powder increases the rotating resistance of the classification wheel and the load of the equipment, affecting the classification efficiency. A large amount of coarse powder is enriched in the waist line part of the classification wheel and collides with each other. The centrifugal force on the coarse powder is unstable (small), the coarse powder that has not been crushed is sucked to the discharge port by negative pressure, affecting the particle size of the fine powder, and the product particle size is not uniform. Therefore, it is urgent to solve the problem.

[0005] The above content is only used to assist in understanding the technical scheme of the utility model and does not represent the acknowledgement of the above content as the closest prior art. UTILITY MODEL CONTENT

[0006] The utility model solves the technical problem of providing a superfine powder airflow crushing and circulating grading device. The device can improve the crushing efficiency of the material, improve the production capacity, reduce the wear of the blades by a large amount of coarse powder around the classification wheel during high-speed rotation, and improve the service life of the equipment.

[0007] To achieve the object, the technical scheme of the utility model is such that the superfine powder airflow crushing circulating classification device comprises: a classification chamber, a crushing chamber and a flow guide assembly; the classification chamber is located at the top of the crushing chamber and is communicated with the crushing chamber; the lower part of the working cavity of the crushing chamber is provided with a crushing area for crushing the feed, and the upper part of the working cavity of the crushing chamber is provided with a classification area, and a classification wheel is arranged in the classification area, and the classification wheel is used for guiding the powder after crushing the feed into the classification chamber;

[0008] The flow guide assembly is installed in the crushing chamber and encloses a flow guide channel for the airflow to drive the powder to flow in the crushing chamber, and the top of the flow guide channel is communicated with the classification wheel of the classification area of the crushing chamber, and the bottom is communicated with the crushing area of the crushing chamber.

[0009] Preferably, the classification wheel is provided with trapezoidal blades; the trapezoidal blades comprise trapezoidal pieces and rectangular pieces; the trapezoidal pieces are provided as inverted right-angle trapezoids, the bottom end of the trapezoidal piece is connected with the rectangular piece, and the right-angle side of the trapezoidal piece is flush with one side of the rectangular piece.

[0010] Preferably, the height ratio of the trapezoidal piece to the rectangular piece is h / H=0.1-0.15, the width ratio of the top end of the trapezoidal piece to the width of the rectangular piece is d / D=1.5-2, and the angle between the oblique side of the trapezoidal piece and the other side of the rectangular piece is 135°-153°.

[0011] Preferably, the flow guide assembly comprises an inner circulating cover; the inner circulating cover is arranged in the classification area of the crushing chamber, and the interval between the inner circulating cover and the inner wall of the crushing chamber constitutes a first channel for the powder to flow along the airflow; the first channel outlet of the first channel is communicated with the crushing area of the crushing chamber, and the inlet is communicated with the top end of the classification wheel; the trapezoidal piece of the trapezoidal blade is located at the inlet of the first channel; the interval between the rectangular piece of the trapezoidal blade and the inner wall of the inner circulating cover constitutes a second channel for the powder to flow along the airflow, and the bottom end of the second channel is communicated with the crushing area of the crushing chamber.

[0012] Preferably, the flow guide assembly further comprises at least three connecting rods; the connecting rods are arranged in the first channel and are arranged at equal intervals along the circumference of the inner circulating cover, one end of the connecting rod is connected with the outer wall of the inner circulating cover, and the other end is connected with the inner wall of the crushing chamber; a vibration exciter is arranged at the first channel outlet.

[0013] Preferably, the flow guide assembly comprises a buffer bin; the buffer bin is arranged on one side of the crushing chamber, the buffer bin inlet is communicated with the top of the classification wheel, and the trapezoidal piece of the trapezoidal blade is opposite to the buffer bin inlet; the buffer bin outlet is communicated with the crushing area of the working cavity of the crushing chamber.

[0014] Preferably, a feed screw is arranged at the buffer bin outlet; one end of the feed screw is communicated with the buffer bin outlet, and the other end is communicated with the crushing area of the working cavity of the crushing chamber.

[0015] Preferably, the top of the buffer bin is provided with a negative pressure exhaust port, and the negative pressure exhaust port is provided with a pulse dust collector; the pulse dust collector is in communication with a dust removal bag in the buffer bin; and a vibration exciter is arranged on the side wall outside the buffer bin.

[0016] Preferably, the motor is arranged on the top of the classification chamber, and the driving shaft of the motor is connected with the classification wheel shaft in the crushing chamber through the classification chamber.

[0017] Preferably, the bottom end of the crushing chamber is provided with a viewing port; the side surface of the bottom of the crushing chamber is provided with a feeding inlet and a Laval nozzle, and the feeding inlet is located above the Laval nozzle.

[0018] The beneficial effects of the utility model are shown in:

[0019] (1) The device can improve the classification effect in the prior art, so that the material in the process is finely divided into three kinds (fine powder, medium powder and coarse powder), and the three kinds of powder are treated respectively. This not only can improve the material circulating classification crushing time, improve the material crushing efficiency, and improve the production capacity. At the same time, the abrasion of the blade around the classification wheel during high-speed rotation is reduced, thereby improving the service life of the equipment.

[0020] (2) The device can reduce the running resistance of the classification wheel, reduce the load of the equipment, improve the stable operation ability of the equipment, and improve the uniformity of the qualified particle size fine powder. The circulating classification crushing improves the fine powder yield. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 The utility model of structural schematic diagram is provided for the utility model;

[0022] Fig. 2 The structure schematic diagram of parallel scheme of the utility model is provided for the utility model;

[0023] Fig. 3 The structure schematic diagram of trapezoidal blade of the utility model is provided for the utility model.

[0024] BRIEF DESCRIPTION OF DRAWINGS:

[0025] 10, motor; 11, driving shaft; 12, trapezoidal blade; 121, trapezoidal piece; 122, rectangular piece; 20, classification chamber; 21, classification discharge port; 30, crushing chamber; 31, inner circulating cover; 32, first channel;

[0026] 321, first channel discharge port; 322, connecting rod; 33, Laval nozzle; 34, feeding inlet;

[0027] 35, viewing port; 36, cover plate; 41, vibration exciter; 50, buffer bin; 60, pulse dust collector; 61, dust removal bag; 71, feeding screw. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The embodiments in the application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] Embodiment 1

[0030] Please refer to Figs. 1-2 The utility model provides superfine powder airflow crushing circulating classification device, include: motor 10, classification chamber 20, broken room 30 and guide component.

[0031] Classification chamber 20 is located at the top of broken room 30 and communicates with broken room 30. Motor 10 is installed at the top of classification chamber 20, and the driving shaft 11 of motor 10 is connected with classification wheel 13 in broken room 30 after passing through classification chamber 20. The lower part of the working cavity of broken room 30 is provided as a crushing area for crushing the feed, and the upper part of the working cavity of broken room 30 is provided as a classification area, and classification wheel 13 is arranged in the classification area, and the classification wheel 13 is used to guide the powder after crushing the feed into classification chamber 20.

[0032] A cover plate 36 is arranged at the top end of broken room 30, and the cover plate 36 is detachably connected with the classification wheel 13, and the cover plate 36 plays a role of preventing the material from escaping during the operation of the equipment, and the classification wheel 13 can be taken out from the cover plate 36 for point maintenance of the equipment. An openable observation port 35 is arranged at the bottom end of broken room 30, and a feed inlet 34 and a Laval nozzle 33 are arranged on the side surface of the bottom of broken room 30, and the feed inlet 34 is located above the Laval nozzle 33.

[0033] In specific application, the material to be crushed enters the crushing area through the feed inlet 34, and the compressed air enters the Laval nozzle 33 and is converted into a hypersonic airflow, so that the materials collide with each other and are gradually crushed to the target particle size powder, the motor 10 drives the classification wheel 13 to rotate at a high speed, and the rotating speed of the classification wheel 13 driven by the motor 10 can be arbitrarily adjusted, and a strong centrifugal force is formed in the classification area. Under the driving of the classification wheel 13, part of the powder with relatively fine particles enters classification chamber 20 and is conveyed to the next production link along the classification discharge port 21 of classification chamber 20.

[0034] The guide component is installed in broken room 30 and encloses a guide channel for the airflow to drive the powder to flow in broken room 30, and the top of the guide channel communicates with the classification wheel 13 in the classification area of broken room 30, and the bottom communicates with the crushing area of broken room 30.

[0035] Through such a setting, the material to be crushed can circulate between the classification area and the crushing area of the crushing chamber 30, repeatedly crushed until the classification wheel 13 conveying standard is reached, and enters the classification chamber 20.

[0036] In order to enable the different diameter powders after crushing to flow smoothly along the guide channel, the trapezoidal blade 12 is provided on the classification wheel 13. The trapezoidal blade 12 includes a trapezoidal piece 121 and a rectangular piece 122; the trapezoidal piece 121 is provided as an inverted right-angle trapezoid, the bottom end of the trapezoidal piece 121 is connected with the rectangular piece 122, and the right-angle side of the trapezoidal piece 121 is flush with one side of the rectangular piece 122.

[0037] The height ratio of the trapezoidal piece 121 to the rectangular piece 122 is h / H = 0.1-0.15, and the width ratio of the top end of the trapezoidal piece 121 to the rectangular piece 122 is d / D = 1.5-2; the angle between the hypotenuse of the trapezoidal piece 121 and the other side of the rectangular piece 122 is 135°-153°.

[0038] Due to the trapezoidal structure design of the trapezoidal blade 12, the centrifugal force of the classification wheel 13 at the outer side area can be improved, that is, by changing the airflow direction at the trapezoidal piece 121 of the trapezoidal blade 12, the airflow is promoted to wrap the corresponding diameter powder into the guide channel, thereby completing the powder screening, and the powder is conveyed along the guide channel to the crushing area to realize secondary circulation crushing.

[0039] The guide assembly includes an inner circulation cover 31 and a connecting rod 322.

[0040] The inner circulation cover 31 is arranged in the classification area of the crushing chamber 30, and the interval between the inner circulation cover 31 and the inner wall of the crushing chamber 30 constitutes a first channel 32 for powder flowing with airflow; the first channel outlet 321 of the first channel 32 is communicated with the crushing area of the crushing chamber 30, and the inlet is communicated with the top end of the classification wheel 13; the trapezoidal piece 121 of the trapezoidal blade 12 is located at the inlet of the first channel 32, so that when the classification wheel 13 rotates, the trapezoidal blade 12 introduces the corresponding diameter powder or powder into the first channel 32.

[0041] The interval between the rectangular piece 122 of the trapezoidal blade 12 and the inner wall of the inner circulation cover 31 constitutes a second channel for powder flowing with airflow, and the bottom end of the second channel is communicated with the crushing area of the crushing chamber 30.

[0042] The connecting rods 322 are at least three; the connecting rods 322 are arranged in the first channel 32 and are equidistantly arranged along the circumference of the inner circulating cover 31, and one end of the connecting rods 322 is connected with the outer wall of the inner circulating cover 31, and the other end is connected with the inner wall of the crushing chamber 30; in order to facilitate the smooth falling of the powder at the first channel discharge port 321 into the crushing area, a vibration exciter 41 is arranged at the first channel discharge port 321, and the vibration exciter 41 is installed on the outer wall of the crushing chamber 30.

[0043] When the motor 10 drives the classification wheel 13 to rotate at high speed, a strong centrifugal force is formed in the classification area. The gas-powder mixture entering the classification area first enters around the classification wheel 13.

[0044] Under the action of the centrifugal force of the classification wheel 13, the medium-sized or heavy medium-powder particles are subjected to a larger centrifugal force, and are transported into the first channel 32 under the auxiliary centrifugal action of the trapezoidal blade 12. The large-sized or heavy coarse-powder particles are subjected to the largest centrifugal force, and are thrown to the space between the classification wheel periphery 13 and the inner wall of the inner circulating cover 31, i.e. along the second channel, and naturally fall into the crushing area to continue to be crushed.

[0045] Small or light material is subjected to a small centrifugal force, hovers inside the classification wheel 13, and is affected by the negative pressure of the classification discharge port 21 of the classification chamber 20 and is brought to the classification discharge port 21, and is transported to the next component along the pipeline to be classified or collected.

[0046] By adjusting the rotating speed of the classification wheel 13 through frequency conversion, the centrifugal force generated at the classification wheel 13 can be adjusted, and then the material in the classification area is automatically classified into three kinds: fine powder (particle size qualified), medium powder (particle size medium), and coarse powder (particle size large) by cooperating with the auxiliary of the flow guide assembly and the trapezoidal blade 12, and the three kinds of powder are treated respectively. This not only achieves the purpose of classifying the specified particle size material, but also avoids the continuous upward wrapping of a large amount of medium powder and coarse powder around the classification wheel 13 by compressed air, reduces the waist line wear of the classification wheel 13. At the same time, the time of the medium powder and the coarse powder in the crushing area is increased, and the crushing efficiency and the purpose of efficient circulation classification of the material are improved.

[0047] Example 2

[0048] According to the design of the trapezoidal blade 12 and the core concept of the ultrafine powder circulation classification of example 1, in addition to the structure of the flow guide channel in the crushing chamber 30, the circulation classification chamber can also be designed separately, such as Fig. 3 as shown in the figure:

[0049] The flow guide assembly includes a buffer bin 50; the buffer bin 50 is arranged on one side of the crushing chamber 30, and the inlet of the buffer bin 50 is communicated with the top of the classification wheel 13, and the trapezoidal blade 121 of the trapezoidal blade 12 is opposite to the inlet of the buffer bin 50, and the outlet of the buffer bin 50 is communicated with the crushing area of the working cavity of the crushing chamber 30.

[0050] The top of the buffer bin 50 is provided with a negative pressure exhaust port, and the negative pressure exhaust port is provided with a pulse dust collector 60; the pulse dust collector 60 is communicated with a dust removal cloth bag 61 in the buffer bin 50; a side wall outside the buffer bin 50 is provided with a vibration exciter 41. The buffer bin 50 is provided with a feeding screw 71 at the discharge port; one end of the feeding screw 71 is communicated with the discharge port of the buffer bin 50, and the other end is communicated with a crushing area of the working cavity of the crushing chamber 30.

[0051] In specific application, the larger particles of the medium powder enter the buffer bin 50 through the structure of the top trapezoidal piece 121 of the trapezoidal blade 12, and the medium powder is re-conveyed to the crushing chamber 30 of the crushing chamber 30 through the vibration exciter 41 and the feeding screw 71 at the bottom of the buffer bin 50.

[0052] In order to ensure the air pressure balance in the buffer bin 50, the air in the buffer bin 50 is discharged through the negative pressure exhaust port, and the medium powder is intercepted by the dust removal cloth bag 61 and falls into the bin again. The pulse dust collector 60 blows the dust on the dust removal cloth bag 61 through the reverse pulse type, so as to prevent the dust removal cloth bag 61 from being blocked.

[0053] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like made in the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A circulating classification device for ultrafine powder jet milling, characterized by, The application relates to a classifier and a crushing assembly. The classifier and the crushing assembly comprise a grading chamber (20), a crushing chamber (30) and a flow guide assembly; the grading chamber (20) is located on the top of the crushing chamber (30) and communicates with the crushing chamber (30); the lower part of the working cavity of the crushing chamber (30) is provided with a crushing area for crushing the feed; the upper part of the working cavity of the crushing chamber (30) is provided with a grading area, the grading area is provided with a grading wheel (13), and the grading wheel (13) is used for guiding the powder crushed from the feed into the grading chamber (20); the flow guide assembly is installed in the crushing chamber (30) and encloses a flow guide channel for the airflow to drive the powder to flow in the crushing chamber (30), and the top of the flow guide channel communicates with the grading wheel (13) of the grading area of the crushing chamber (30), and the bottom of the flow guide channel communicates with the crushing area of the crushing chamber (30).

2. The apparatus according to claim 1, wherein The grading wheel (13) is provided with trapezoidal blades (12); the trapezoidal blades (12) comprise trapezoidal blades (121) and rectangular blades (122); the trapezoidal blades (121) are provided as inverted right-angle trapezoids, the bottom end of the trapezoidal blades (121) is connected with the rectangular blades (122), and the right-angle side of the trapezoidal blades (121) is flush with one side of the rectangular blades (122).

3. The apparatus of claim 2, wherein The height ratio of the trapezoidal blades (121) to the rectangular blades (122) is h / H=0.1-0.15, the width ratio of the top end of the trapezoidal blades (121) to the rectangular blades (122) is d / D=1.5-2, and the included angle between the oblique side of the trapezoidal blades (121) and the other side of the rectangular blades (122) is 135-153 degrees.

4. The apparatus according to claim 2 or 3, wherein The flow guide assembly comprises an inner circulating cover (31); the inner circulating cover (31) is arranged in the grading area of the crushing chamber (30), and the interval between the inner circulating cover (31) and the inner wall of the crushing chamber (30) forms a first channel (32) for the powder to flow along the airflow; the first channel outlet (321) of the first channel (32) communicates with the crushing area of the crushing chamber (30), and the top end of the grading wheel (13) communicates with the inlet; the trapezoidal blades (121) of the trapezoidal blades (12) are located at the inlet of the first channel (32); the interval between the rectangular blades (122) of the trapezoidal blades (12) and the inner wall of the inner circulating cover (31) forms a second channel for the powder to flow along the airflow, and the bottom end of the second channel communicates with the crushing area of the crushing chamber (30).

5. The apparatus of claim 4, wherein The flow guide assembly further comprises at least three connecting rods (322); the connecting rods (322) are arranged in the first channel (32) and are arranged at equal intervals along the circumference of the inner circulating cover (31), one end of the connecting rods (322) is connected with the outer wall of the inner circulating cover (31), and the other end is connected with the inner wall of the crushing chamber (30); the first channel outlet (321) is provided with a vibration exciter (41).

6. The apparatus according to claim 2 or 3, wherein The flow guide assembly comprises a buffer bin (50); the buffer bin (50) is arranged on one side of the crushing chamber (30), the feed inlet of the buffer bin (50) communicates with the top of the grading wheel (13), and the trapezoidal blades (121) of the trapezoidal blades (12) are opposite to the feed inlet of the buffer bin (50); the outlet of the buffer bin (50) communicates with the crushing area of the working cavity of the crushing chamber (30).

7. The apparatus of claim 6 wherein The discharge port of the buffer bin (50) is provided with a feeding screw (71); one end of the feeding screw (71) is communicated with the discharge port of the buffer bin (50), and the other end is communicated with the crushing area of the working cavity of the crushing chamber (30).

8. The apparatus of claim 7, wherein The top of the buffer bin (50) is provided with a negative pressure exhaust port, and the negative pressure exhaust port is provided with a pulse dust collector (60); the pulse dust collector (60) is communicated with a dust removal bag (61) in the buffer bin (50); the sidewall outside the buffer bin (50) is provided with a vibration exciter (41).

9. The apparatus according to claim 2 or 3, wherein Further comprising a motor (10); the motor (10) is installed at the top of the grading chamber (20), and the driving shaft (11) of the motor (10) is connected with the grading wheel (13) shaft in the crushing chamber (30) after penetrating through the grading chamber (20).

10. The apparatus of claim 9, wherein The bottom end of the crushing chamber (30) is provided with an observation port (35); the side of the bottom of the crushing chamber (30) is provided with a feeding inlet (34) and a Laval nozzle (33), and the feeding inlet (34) is located above the Laval nozzle (33).

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