Screening device and lithium battery pole piece material dry manufacturing equipment

Abstract

The utility model discloses a screening device and lithium battery pole piece material dry manufacturing equipment, and the screening device comprises a shell assembly which is provided with a grading air channel, and air-material mixed airflow circulates in the grading air channel; the centrifugal assembly comprises a centrifugal fan, the centrifugal fan is arranged in the grading air duct, and when the air-material mixed airflow passes through the centrifugal fan, the centrifugal fan rotates to conduct centrifugal grading; and the crushing assembly is arranged on the upstream of the centrifugal fan and comprises at least two air inlets, the two air inlets can generate intersecting airflow, and the intersecting airflow can drive raw materials to collide with one another and is used for forming the air-material mixed airflow. According to the screening device and the lithium battery pole piece material dry manufacturing equipment, multi-stage screening of powder can be achieved, universality is high, and application and popularization are easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery's production equipment, especially relates to a screening device and lithium battery pole piece material dry method manufacturing equipment. BACKGROUND

[0002] In the prior art, a patent document with the publication date of July 19, 2024, the publication number CN117899722B, the application number CN202410318652.3, and the patent name Fiberization electrode powder shearing mixing equipment and application in preparation of lithium battery is disclosed.

[0003] In the technical solution of the patent document, it is recorded that the powder moves between the upper shear wing and the lower shear wing under the action of the airflow, contacts the lower shear wing with the rotation of the upper shear wing, the upper shear wing is subjected to the extrusion force of the lower shear wing, the elastic member is elongated, and the powder is extruded by the extrusion force of the upper shear wing and the lower shear wing, the effect of grinding the powder is achieved, and the powder is reset under the action of the elastic force of the elastic member after the upper shear wing and the lower shear wing are separated, the powder forms particles with smaller particle size after being ground, and the powder continuously moves and mixes in the cylinder under the action of the airflow, and the powder with qualified particle size passes through the filter holes on the filter screen and moves out to the designated discharging position from the discharge pipe.

[0004] That is, the particle size of the powder depends on the pressure of the upper shear wing on the lower shear wing, and the pressure is mainly the combined force of the gravity of the upper shear wing, the elastic force of the elastic member and the airflow pressure.

[0005] However, the powder specification that can be screened by the above technical solution is relatively single. INVENTION CONTENTS

[0006] The utility model aims at solving one of the technical problems existing in the prior art. To this end, the utility model provides a screening device, which can realize multi-stage screening of powder, has strong versatility and is easy to popularize and apply.

[0007] The utility model also provides a lithium battery pole piece material dry method manufacturing equipment with the screening device.

[0008] According to the screening device of the first aspect embodiment of the utility model, the screening device comprises:

[0009] The shell assembly has a grading air duct, and the grading air duct flows through the gas-material mixed airflow;

[0010] The centrifugal assembly comprises a centrifugal fan, and the centrifugal fan is arranged in the grading air duct. When the gas-material mixed airflow passes through the centrifugal fan, the centrifugal fan rotates to centrifugally grade;

[0011] The breaking assembly is arranged upstream of the centrifugal fan, and includes at least two air inlets, the two air inlets can generate intersecting air flows, the intersecting air flows can drive the raw materials to collide with each other, and the intersecting air flows are used for forming the gas-material mixed air flow.

[0012] According to the screening device, at least the following beneficial effects are achieved:

[0013] The centrifugal assembly is provided with the centrifugal fan, so that the centrifugal fan rotates and the centrifugal force can separate the larger and heavier powder from the gas-material mixed air flow.

[0014] The screening is performed by using the centrifugal principle, the dependence on the sieve hole is reduced, and the sieve hole is prevented from being blocked to affect the output efficiency.

[0015] In addition, the output of the screening device can be more than one, for example, the larger or heavier particles separated by the centrifugal fan and the lighter or smaller particles remaining in the gas-material mixed air flow after passing through the centrifugal fan.

[0016] The breaking assembly is arranged, the intersecting air flows are formed, that is, at least two material-containing air flows intersect during the flowing process, so that the powders in the two material-containing air flows collide with each other, the large particles are impacted into small particles, the small particles are adhered into small particles, the specifications of the powders tend to be consistent, and the output efficiency of the screening device is improved.

[0017] In addition, the wind speed or intensity of the intersecting air flow can be adjusted to change the particle size of the generated powder, meet the output needs, and not affect the output efficiency due to changes in demand.

[0018] In addition, the intersecting air flow changes the particle size in a manner that does not require the use of the upper shear wing and the lower shear wing in the prior art, can prevent the upper shear wing and the lower shear wing from being abraded to introduce impurities, and avoids affecting the quality of the powder.

[0019] In addition, the screening device of the utility model discloses eliminates the shearing device and the corresponding power, can simplify the structure, reduce the manufacturing cost, can reduce the energy consumption, reduces the use cost, is easy to popularization and application.

[0020] The utility model discloses a kind of lithium battery pole piece material dry method manufacturing equipment, with the beneficial effect described above.

[0021] According to the screening device of the first aspect of the utility model, the classified air duct is arranged up and down, the inlet of the classified air duct, the air inlet and the centrifugal fan are sequentially arranged from bottom to top.

[0022] Beneficially, the utility model discloses the classified air duct is arranged up and down, makes the classified air duct's entrance to be lower, and therefore, under the action of gravity, the heavy powder material can return or be close to the crushing assembly, and the crushing is carried out again, and the crushing under the secondary bonding state of material is carried out, the particle size difference of the gas material mixed gas stream flowing to the centrifugal fan is small, and the output can be increased.

[0023] According to the screening device of the first aspect of the utility model, the shell assembly has a circulating air duct, the circulating air duct is connected and communicated with both ends of the classified air duct, so that the air flow circulates, and the circulating air duct has a feeding air port communicated with the inlet of the classified air duct.

[0024] Beneficially, the utility model discloses the circulating air duct, and the air flow circulation is also facilitated, which can reduce or even eliminate the gas purification equipment, reduce the manufacturing cost and use cost, including the consumed energy and consumables, and save the site.

[0025] According to the screening device of the first aspect of the utility model, the feeding air port is provided with a shielding piece, and the gap between the shielding piece and the feeding air port allows the air flow to flow into the classified air duct.

[0026] Beneficially, the utility model discloses the shielding piece, which can reduce the effective cross-sectional area of the feeding air port, so that a gap is formed between the shielding piece and the feeding air port, the falling powder material is conveniently blown to the crushing assembly, and the powder material is difficult to be crushed after falling below the air inlet, so that efficient screening is realized.

[0027] According to the screening device of the first aspect of the utility model, the shielding piece is located upstream of the intersecting air flow, so that the air flow of the feeding air port is staggered with the intersecting air flow.

[0028] Beneficially, the utility model discloses the shielding piece, which also shields the air flow of the feeding air port, avoids the air flow directly impacting the intersection of the intersecting air flow, and avoids affecting the effect of particle mutual collision.

[0029] According to the screening device of the first aspect of the utility model, the classified air duct is provided with a separation screen and a material collecting box, the separation screen and the material collecting box are located downstream of the centrifugal fan, the material collecting box is located between the separation screen and the centrifugal fan, and the material collecting box is used for collecting the powder material not passing through the separation screen.

[0030] Beneficially, the utility model discloses a separation screen and the collection box are also convenient for collecting the powder material of the consistent particle diameter, reduce the proportion of too small particle in the powder material, and help to reduce the segregation phenomenon.

[0031] According to the first aspect of the utility model discloses an embodiment's screening device, the collection box is provided with first opening, and the first opening is used for allowing the gas material mixed gas flow to the separation screen flow.

[0032] Beneficially, the utility model discloses a first opening, also reduce the shelter of gas material mixed gas flow, and the gas material mixed gas flow is convenient to the separation screen flow, and when the powder material falls from the separation screen, help the powder material to fall to the collection box.

[0033] According to the first aspect of the utility model discloses an embodiment's screening device, the first opening allows the driving shaft of centrifugal fan to pass through to connect power.

[0034] Beneficially, the utility model discloses a first opening, also convenient for arranging the driving shaft of centrifugal fan, convenient to dismount, and simultaneously, reduce the impact of gas material mixed gas flow to the driving shaft, avoid the abrasion of driving shaft.

[0035] According to the first aspect of the utility model discloses an embodiment's screening device, the separation screen is located in the centrifugal fan's downstream in the classification air duct, and the separation screen is cone cylinder, and the small end of separation screen is away from the centrifugal fan and is arranged, and the big end of separation screen is close to the centrifugal fan and is arranged.

[0036] Beneficially, the utility model discloses a separation screen, and the separation screen is cone cylinder, so on the basis of not increasing the diameter of classification air duct, increase the surface area of separation screen, increase the number of sieve hole and filter area, reduce the flow resistance of airflow, and simultaneously, also convenient for collecting powder material.

[0037] And the small end of separation screen is away from the centrifugal fan, also increase the space between the collection box and separation screen, and help the powder material to settle to the collection box.

[0038] According to the first aspect of the utility model discloses an embodiment's screening device, the big end of separation screen is away from the centrifugal fan and is arranged, and the small end of separation screen is close to the centrifugal fan and is arranged.

[0039] Beneficially, the small end of separation screen is close to the centrifugal fan, can make airflow disperse to the edge of separation screen, and the powder material directly falls to the collection box.

[0040] According to the first aspect of the utility model discloses an embodiment's screening device, the classification air duct has centrifugal section, and the centrifugal section is used for accommodating the centrifugal fan, and in the centrifugal section, the gas material mixed gas flow passes the centrifugal fan along the axis direction of centrifugal fan.

[0041] Beneficially, the air-material mixed airflow passes through the centrifugal fan along the axial direction of the centrifugal fan, so that the centrifugal force of the centrifugal fan can be used to screen the larger and heavier powder, and the flow of the air-material mixed airflow can be used to continue to drive the fine powder to flow, so that the two kinds of powder with different particle sizes are separated, and the special arrangement of the airflow direction produces the required separation effect, and the entity is less modified, and the structure is simple and simplified.

[0042] According to the screening device of the first aspect of the utility model, the crushing assembly includes an impact air nozzle, and the port of the impact air nozzle is used to form the air inlet, and the port of the impact air nozzle is arranged close to the center of the classification air duct.

[0043] Beneficially, the port of the impact air nozzle is arranged close to the center of the classification air duct, which helps to shorten the distance between the air inlets and the route length from the air inlets to the airflow intersection, and ensures the strength of the mutual collision of particles in the intersecting airflow.

[0044] According to the screening device of the first aspect of the utility model, the crushing assembly includes a gas supply air duct communicating with the air inlets, and the gas supply air duct is provided with a feeding port for feeding powder.

[0045] Beneficially, the feeding port is arranged on the gas supply air duct, which also facilitates feeding of the powder into the classification air duct, and ensures that the fed powder is crushed by the crushing assembly, has high crushing efficiency, avoids omission, and does not need to open the classification air duct for feeding, which helps to reduce downtime.

[0046] According to the screening device of the first aspect of the utility model, the gas supply air duct includes a circular ring air duct part, and the air inlets are arranged along the circumference of the circular ring air duct part.

[0047] Beneficially, the circular ring air duct part is arranged, which facilitates connection and communication of the air inlets, reduces manufacturing difficulty, and also allows the number of air inlets to be increased or decreased as needed to meet different use needs.

[0048] According to the second aspect of the utility model, the lithium battery pole piece material dry manufacturing equipment includes the screening device of any one of the above.

[0049] Beneficially, the screening device can screen powder of different grades or specifications, meet the needs of lithium battery pole piece material production and manufacturing, and does not need to prepare a screening device for each specification, thereby reducing equipment cost.

[0050] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical scheme of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings.

[0052] Figure 1 The screening device of the embodiment of the present application.

[0053] Reference signs: 100 - grading air duct, 110 - centrifugal fan, 120 - air inlet, 130 - circulating air duct, 140 - feeding air port, 150 - shielding piece, 160 - separation screen, 170 - material collecting box, 180 - first opening, 190 - impact air nozzle, 200 - air supply air duct, 210 - circular ring air duct part. DETAILED DESCRIPTION

[0054] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as limiting the present application.

[0055] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore cannot be understood as limiting the present application.

[0056] In the description of the utility model, if several meanings are one or more, the meaning of multiple is two or more, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number.If there is a description to the first and second, this is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0057] In the description of the utility model, it is necessary to point out that, unless there is definite stipulation and limitation, the term "installation, connection and connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements.The above-mentioned term in the utility model can be understood according to specific circumstances by the person skilled in the art.

[0058] The screening device and the lithium battery pole piece material dry process manufacturing equipment according to the embodiments of the utility model are described below with reference to the drawings.

[0059] Referring to Figure 1 The utility model aims at providing an embodiment of screening device, and the screening device can be part of lithium battery pole piece material dry process manufacturing equipment, thus, the utility model also aims at providing an embodiment of lithium battery pole piece material dry process manufacturing equipment, and the lithium battery pole piece material dry process manufacturing equipment comprises the screening device.

[0060] Compared with the prior art, the screening device of the utility model can realize multi-stage screening of powder, has strong versatility and is easy to popularize and apply.Meanwhile, the lithium battery pole piece material dry process manufacturing equipment of the utility model can screen out powder of different grades or specifications by applying the above-mentioned screening device, meets the needs of lithium battery pole piece material production and manufacturing, does not need to prepare a screening device for each specification, reduces equipment cost, and simultaneously, the screening device of the utility model eliminates the shearing device in the prior art, has simple and simplified structure, and moreover, has low energy consumption.

[0061] In the embodiment, the screening device mainly comprises a shell assembly, a centrifugal assembly and a crushing assembly.

[0062] For the shell assembly, the shell assembly has a classification air duct 100, and the classification air duct 100 has a gas-material mixed airflow flowing therethrough.

[0063] In some specific embodiments of the utility model, the classification air duct 100 can be connected with an air pump, powder can be conveniently blown up, so that the classification air duct 100 has the gas-material mixed airflow flowing therethrough, so as to carry out screening.

[0064] In some specific embodiments of the utility model, can make the classification air duct 100 extend arrangement up and down, the classification air duct 100's entrance is located at the bottom or lower setting, the classification air duct 100's exit is located positioning or upper setting, thus, when the air pump stops working, powder will fall to the classification air duct 100's entrance, in order to discharge or re-screen, also avoid powder to block the classification air duct 100's exit.

[0065] In some specific embodiments of the utility model, can make the shell assembly include circulating air duct 130, circulating air duct 130 connects the classification air duct 100's entrance and exit, to make the airflow in the screening device circulating flow, reduce the leakage to the outside.

[0066] In detail, circulating air duct 130 has the feeding air port 140 that communicates the classification air duct 100's entrance.

[0067] It is easy to understand that, the embodiment of the application by setting circulating air duct 130, also make the airflow circulating flow, on the one hand, can reduce even save gas purification equipment, reduce manufacturing cost and use cost, use cost includes the energy consumption and consumables, save the site.

[0068] In some specific embodiments of the utility model, can make circulating air duct 130 and classification air duct 100 one by one configuration, also can not be in proportion, for example, there are multiple circulating air ducts 130 in the surrounding ring of classification air duct 100, to reduce the airflow circulation resistance, at the same time, also facilitate the air supply to the crushing assembly.

[0069] In some specific embodiments of the utility model, can make the feeding air port 140 be provided with the shielding piece 150, and the gap between shielding piece 150 and feeding air port 140 allows airflow to flow into classification air duct 100.

[0070] It is easy to understand that, the embodiment of the application by setting shielding piece 150, can reduce the effective cross-sectional area of feeding air port 140, so that shielding piece 150 and feeding air port 140 form a slit, blow the falling powder to the crushing assembly, avoid the powder falling below the air inlet 120 to be difficult to be crushed, thereby, efficiently screen.

[0071] At the same time, shielding piece 150 can also shield feeding air port 140, prevent foreign matter from falling into circulating air duct 130.

[0072] In some specific embodiments of the utility model, can make the shielding piece 150 be conical, the large end of shielding piece 150 is close to circulating air duct 130 and is set, the small end of shielding piece 150 is closed and is away from circulating air duct 130, thus, when the powder falls to shielding piece 150, it is easy to fall to the gap between shielding piece 150 and feeding air port 140, blow the powder again, prevent the residual powder on shielding piece 150.

[0073] In some specific embodiments of the present application, the shielding member 150 can be located upstream of the intersecting airflow, so that the airflow of the feeding air port 140 is staggered with the intersecting airflow, and the intersecting airflow is generated by the crushing assembly.

[0074] It is easy to understand that, by setting the shielding member 150, the airflow of the feeding air port 140 is also shielded, avoiding the direct impact of the airflow on the intersection of the intersecting airflow, and avoiding affecting the effect of particle collision.

[0075] Referring to Figure 1 The inlet of the grading air duct 100, the crushing assembly and the centrifugal assembly are arranged from bottom to top on the flow route of the gas-material mixed airflow, and at the same time, it is also explained that the crushing assembly is arranged upstream of the centrifugal assembly.

[0076] It is easy to understand that, by arranging the grading air duct 100 upward and downward, the inlet of the grading air duct 100 is located at the lower part, so that under the action of gravity, the heavier powder will return or approach the crushing assembly, and re-crushing is performed under the condition of secondary material bonding, so that the particle size difference of the gas-material mixed airflow flowing to the centrifugal fan 110 is small, and the output can be increased.

[0077] In some specific embodiments of the present application, the grading air duct 100 can be horizontally extended or obliquely arranged, but the adhesion effect of the grading air duct 100 needs to be considered.

[0078] For the crushing assembly, at least two air inlets 120 are included, the two air inlets 120 can generate intersecting airflow, the intersecting airflow can drive the raw materials to collide with each other, and the intersecting airflow is used to form the gas-material mixed airflow.

[0079] In some specific embodiments of the present application, the number of air inlets 120 can be three or more, so that the intersecting airflow can be the intersection of two airflows, or the intersection of multiple airflows.

[0080] The present application can form intersecting airflow by setting the crushing assembly, that is, at least two material-containing airflows intersect during the flow process, so that the powder in the two material-containing airflows collides with each other, which can not only impact large particles into small particles, but also adhere small particles into small particles, so that the specifications of the powder tend to be consistent, which helps to improve the output efficiency of the screening device.

[0081] Moreover, the present application can also adjust the wind speed or intensity of the intersecting airflow to change the particle size of the generated powder, meet the output needs, and will not affect the output efficiency due to the change of demand.

[0082] Meanwhile, the intersecting air flow changes the particle size in a way that the upper shear wing and the lower shear wing in the prior art are not needed, the upper shear wing and the lower shear wing are prevented from being abraded to introduce impurities, and the quality of the powder is prevented from being affected.

[0083] Meanwhile, the shear device and the corresponding power are omitted, structure is simplified, manufacturing cost is reduced, energy consumption is reduced, use cost is reduced, and the utility model is easy to popularize and apply.

[0084] In some specific embodiments of the utility model, the crushing assembly can include an impact air nozzle 190, and the port of the impact air nozzle 190 is used to form the air inlet 120, and the port of the impact air nozzle 190 is arranged close to the center of the classification air duct 100.

[0085] It is easy to understand that, by arranging the impact air nozzle 190, the port of the impact air nozzle 190 is arranged close to the center of the classification air duct 100, the distance between the air inlets 120 is shortened, the route length from the air inlets 120 to the air flow intersection is shortened, and the strength of the mutual collision of particles in the intersecting air flow is ensured.

[0086] In some specific embodiments of the utility model, the port of the impact air nozzle 190 can be deviated from the centrifugal assembly, so that the powder flows along the wind, and the powder is conveniently fed to the centrifugal assembly.

[0087] In some specific embodiments of the utility model, the crushing assembly can include a gas supply air duct 200 connected with the air inlets 120, and the gas supply air duct 200 is provided with a feeding port for feeding the powder.

[0088] It is easy to understand that, by arranging the feeding port on the gas supply air duct 200, the powder is conveniently fed to the classification air duct 100, the powder fed is ensured to pass through the crushing assembly for crushing, the crushing efficiency is high, the omission is avoided, the classification air duct 100 does not need to be opened for feeding, and the downtime is reduced.

[0089] In some specific embodiments of the utility model, the gas supply air duct 200 can include a circular ring air duct part 210, and the air inlets 120 are arranged along the circumference of the circular ring air duct part 210.

[0090] It is easy to understand that, by arranging the circular ring air duct part 210, the air inlets 120 are conveniently connected and communicated, the manufacturing difficulty is reduced, and the air inlets 120 can be increased or decreased according to needs, so that different use needs are met.

[0091] In some specific embodiments of the utility model, the gas supply air duct 200 can include a polygonal air duct part, so as to reduce the manufacturing difficulty.

[0092] In some specific embodiments of the present application, the circulating air duct 130 can include a gas supply air duct 200, so that the gas source for the crushing assembly does not need to be set up separately, and the setting is simplified.

[0093] In some specific embodiments of the present application, the circulating air duct 130 can be provided with an air flow distribution valve, so that the air flow is provided to the classification air duct 100 and the crushing assembly in a quantitative or proportional and balanced manner.

[0094] In some specific embodiments of the present application, the shell assembly can be provided with a cold source or a heat source to meet the temperature requirements of the powder, so that the powder can maintain the required state for production.

[0095] For the centrifugal assembly, the centrifugal assembly includes a centrifugal fan 110, which is arranged in the classification air duct 100, and when the gas-powder mixed gas flow passes through the centrifugal fan 110, the centrifugal fan 110 rotates to centrifugally classify.

[0096] In some specific embodiments of the present application, the centrifugal fan 110 can be provided with a powder collecting component in the radial direction, so that the collection of large and heavy powders is facilitated.

[0097] It is easy to understand that, by arranging the centrifugal assembly, the centrifugal assembly has the centrifugal fan 110, so that the centrifugal fan 110 rotates, and the large and heavy powders can be separated from the gas-powder mixed gas flow by using the centrifugal force, and at the same time, in use, the rotational speed of the centrifugal fan 110 can be adjusted to change the size of the centrifugal force, so that the particle size of the separated powder can be adjusted, and thus powders of different specifications can be screened out, and multi-stage screening can be realized.

[0098] The present application uses the centrifugal principle for screening, reduces the dependence on the screen hole, and avoids the screen hole from being blocked to affect the output efficiency.

[0099] Furthermore, the output of the present application can be more than one, such as the large or heavy particles separated by the centrifugal fan 110 and the lighter or smaller particles still remaining in the gas-powder mixed gas flow after passing through the centrifugal fan 110.

[0100] In the present embodiment, the classification air duct 100 is composed of a plurality of concentric pipe sections, the structure is simple, the air flow path is short, the air flow resistance is reduced, the powder adhering to the wall surface of the classification air duct 100 is reduced, and at the same time, the screening device has a compact structure and a small volume, and is convenient to arrange.

[0101] In some specific embodiments of the present application, each pipe section can be arranged in the same diameter, tapered or gradually expanded to meet the space arrangement requirements.

[0102] In some specific embodiments of the utility model, the grading air duct 100 can be provided with a centrifugal section, the centrifugal section is used for accommodating the centrifugal fan 110, and in the centrifugal section, the gas-material mixed airflow passes through the centrifugal fan 110 along the axial direction of the centrifugal fan 110.

[0103] It is easy to understand that, by making the gas-material mixed airflow pass through the centrifugal fan 110 along the axial direction of the centrifugal fan 110, both the centrifugal force of the centrifugal fan 110 can be used to screen the larger and heavier powder, and the flow of the gas-material mixed airflow can also be used to continue to drive the fine powder to flow, so that the two powders with different particle sizes are separated, and the special arrangement of the airflow direction produces the required separation effect, and the entity is less modified and the structure is simple and simplified.

[0104] Meanwhile, after the gas-material mixed airflow passes through the centrifugal fan 110, the gas-material mixed airflow is in a spiral rising state, and can be centrifugally screened, without being limited by the size of the centrifugal fan 110.

[0105] In some specific embodiments of the utility model, the centrifugal fan 110 can include a plurality of fan blades, the fan blades are flat plates extending along the axial direction of the centrifugal fan 110, so as to increase the effect of driving the gas-material mixed airflow to rotate and enhance the centrifugal effect.

[0106] In some specific embodiments of the utility model, the centrifugal section can be provided with a detachable cover, so as to clean and replace the centrifugal fan 110 and the impact air nozzle 190.

[0107] In some specific embodiments of the utility model, the grading air duct 100 can be provided with a separation sieve 160, and the separation sieve 160 is located downstream of the centrifugal fan 110.

[0108] It is easy to understand that, by arranging the separation sieve 160, the powder can be more accurately screened, and the possibility of mixing materials can be reduced.

[0109] Meanwhile, when the operating parameters of the screening device are certain, the particle size of the powder in the gas-material mixed airflow passing through the centrifugal assembly is certain, and the separation sieve 160 can be omitted, the airflow flow resistance can be reduced, the screening efficiency can be improved, and the structure of the screening device can be simplified.

[0110] In some specific embodiments of the utility model, the separation sieve 160 can be in the shape of a conical cylinder, the small end of the separation sieve 160 is arranged away from the centrifugal fan 110, and the large end of the separation sieve 160 is arranged close to the centrifugal fan 110.

[0111] It is easy to understand that, in the embodiment, the separation screen 160 is arranged in a conical cylinder shape, so that the surface area of the separation screen 160 is increased without increasing the diameter of the classification air duct 100, the number of sieve holes and the filtering area are increased, the airflow flow resistance is reduced, and the powder material is conveniently collected.

[0112] The small end of the separation screen 160 is away from the centrifugal fan 110, and the space between the collection box 170 and the separation screen 160 is increased, which helps the powder material to settle in the collection box 170.

[0113] In some specific embodiments of the utility model, the large end of the separation screen 160 can be arranged away from the centrifugal fan 110, and the small end of the separation screen 160 can be arranged close to the centrifugal fan 110.

[0114] It is easy to understand that, the small end of the separation screen 160 is close to the centrifugal fan 110, which can disperse the airflow to the edge of the separation screen 160, and the powder material can directly fall into the collection box 170.

[0115] In some specific embodiments of the utility model, the separation screen 160 and the collection box 170 can be arranged in the classification air duct 100, the separation screen 160 and the collection box 170 are located downstream of the centrifugal fan 110, the collection box 170 is located between the separation screen 160 and the centrifugal fan 110, and the collection box 170 is used for collecting the powder material that does not pass through the separation screen 160.

[0116] It is easy to understand that, in the embodiment, the separation screen 160 and the collection box 170 are arranged, and the powder material with a relatively uniform particle diameter is conveniently collected, the proportion of excessively small particles in the powder material is reduced, and the segregation phenomenon is reduced.

[0117] In some specific embodiments of the utility model, the collection box 170 can be provided with a first opening 180, and the first opening 180 is used for allowing the airflow and material mixed airflow to flow to the separation screen 160.

[0118] It is easy to understand that, in the embodiment, the first opening 180 is arranged, the airflow and material mixed airflow is further reduced, the airflow and material mixed airflow flows to the separation screen 160, and when the powder material falls from the separation screen 160, the powder material falls into the collection box 170.

[0119] In some specific embodiments of the utility model, the first opening 180 can allow the driving shaft of the centrifugal fan 110 to pass through, so as to be connected to the power.

[0120] It is easy to understand that, in the embodiment, the first opening 180 is arranged, the driving shaft of the centrifugal fan 110 is conveniently arranged, the disassembly and assembly are facilitated, the impact of the airflow and material mixed airflow on the driving shaft is reduced, and the abrasion of the driving shaft is avoided.

[0121] In some specific embodiments of the present application, the aggregate box 170 can include two half boxes, so as to facilitate the formation of the first opening 180, and facilitate disassembly.

[0122] In some specific embodiments of the present application, the aggregate box 170 can have a discharge slope, facilitating the discharge of the powder.

[0123] In some specific embodiments of the present application, the side wall of the grading air duct 100 can have a drawer type structure, facilitating the movement of the aggregate box 170 in or out.

[0124] In the description of the present application, the description of the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples, or some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples as appropriate.

[0125] The terms "first, second, third, fourth" and the like (if any) in the specification of the present application and claims and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0126] It should also be noted that in the description of the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or sequence between the entities or operations.

[0127] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can also include other steps or units not clearly listed or inherent to the process, method, product or device.

[0128] Also, the term "comprise", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0129] The embodiments of the utility model are explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A screening device, characterized in that The application relates to a shell assembly with a hierarchical air duct (100) in which a gas-material mixed airflow flows; a centrifugal assembly comprising a centrifugal fan (110) arranged in the hierarchical air duct (100), which rotates to centrifugally classify when the gas-material mixed airflow passes through the centrifugal fan (110); and a crushing assembly arranged upstream of the centrifugal fan (110) and comprising at least two air inlets (120) capable of generating intersecting airflows that can drive raw materials to collide with each other and are used to form the gas-material mixed airflow. The hierarchical air duct (100) is arranged in an up-down manner, and the inlet of the hierarchical air duct (100), the air inlets (120) and the centrifugal fan (110) are sequentially arranged from bottom to top. The shell assembly has a circulating air duct (130) connected and communicated with both ends of the hierarchical air duct (100) to make the airflow flow in a circulating manner, and the circulating air duct (130) has a feeding air port (140) communicated with the inlet of the hierarchical air duct (100). The feeding air port (140) is provided with a shielding piece (150), and a gap between the shielding piece (150) and the feeding air port (140) allows the airflow to flow into the hierarchical air duct (100), and / or the shielding piece (150) is located upstream of the intersecting airflows to stagger the airflow of the feeding air port (140) with the intersecting airflows.

2. The screening apparatus of claim 1, wherein, The hierarchical air duct (100) is provided with a separation screen (160) and a material collecting box (170), the separation screen (160) and the material collecting box (170) are located downstream of the centrifugal fan (110), the material collecting box (170) is located between the separation screen (160) and the centrifugal fan (110), and the material collecting box (170) is used for collecting powder that does not pass through the separation screen (160).

3. The screening apparatus of claim 1, wherein, The material collecting box (170) is provided with a first opening (180) for allowing the gas-material mixed airflow to flow to the separation screen (160), and / or the first opening (180) allows a driving shaft of the centrifugal fan (110) to pass through to be connected with power.

4. The screening apparatus of claim 3, wherein, The hierarchical air duct (100) is provided with a separation screen (160), the separation screen (160) is located downstream of the centrifugal fan (110), the separation screen (160) is in the shape of a tapered cylinder, a small end of the separation screen (160) is arranged away from the centrifugal fan (110), a large end of the separation screen (160) is arranged close to the centrifugal fan (110), or the large end of the separation screen (160) is arranged away from the centrifugal fan (110) and the small end of the separation screen (160) is arranged close to the centrifugal fan (110).

5. The screening apparatus of claim 1, wherein, ​ 6. The screening apparatus of claim 5, wherein, ​ 7. The screening apparatus of claim 1, wherein, ​ 8. The screening apparatus of claim 1, wherein, The classification air duct (100) has a centrifugal section for accommodating the centrifugal fan (110), in which section the gas mixture flows along the axis of the centrifugal fan (110) through the centrifugal fan (110), and / or the crushing assembly comprises an impact nozzle (190), the port of which forms the gas inlet (120) and is arranged close to the center of the classification air duct (100).

9. The screening apparatus of claim 1, wherein, The crushing assembly comprises a gas supply air duct (200) which communicates with the gas inlet (120), is provided with a material feeding port for feeding powder, and / or comprises a circular ring air duct section (210), and the gas inlet (120) is arranged along the circumference of the circular ring air duct section (210).

10. A lithium battery pole piece material dry manufacturing apparatus characterized by, A screening device according to any one of claims 1 to 9.

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