An on-line iron removal air flow mixer for lithium ion battery powder and a mixing and iron removal method

Abstract

The present invention discloses an on-line iron removal air flow mixer for lithium-ion battery powder and a mixing and iron removal method. The on-line iron removal air flow mixer includes a top cover disposed on the top of the feed bin, a dust removal filter element mounting plate disposed inside the feed bin, and a plurality of dust removal filter elements disposed on the dust removal filter element mounting plate. The dust removal filter element mounting plate divides the internal space of the feed bin into an upper chamber of the feed bin and a lower chamber of the feed bin; a synchronous mixing on-line iron removal device is further provided, and the synchronous mixing on-line iron removal device includes a plurality of electromagnetic iron removal rods vertically arranged at intervals inside the feed bin and passing through the dust removal filter element mounting plate, a lifting plate disposed in the upper chamber of the feed bin and fixedly connected to the upper ends of the plurality of electromagnetic iron removal rods respectively, and a first linear actuator disposed on the top cover and connected to the lifting plate to realize the up and down movement of the lifting plate and the electromagnetic iron removal rods. The present invention improves the iron removal effect and mixing uniformity of lithium-ion battery powder, and has high production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery powder production, and particularly relates to an on-line iron removal air flow mixer for lithium ion battery powder and a mixing and iron removal method. Background Art

[0002] In a lithium battery dry pulverization and conveying system production line, an air flow mixer is provided, and its function is to fully mix a variety of lithium battery powder materials produced by the previous production equipment of the production line. Considering that a small amount of iron particles will inevitably be brought into the lithium battery powder materials during the production process of the lithium battery powder materials, and the presence of iron elements will reduce the performance of the lithium battery, several iron removal processes are also provided in the lithium battery dry pulverization and conveying system production line according to different quality requirements.

[0003] In the prior art, for the iron removal of powder materials, a special iron removal device is usually adopted. For example, after the lithium battery powder is mixed, a dry powder iron remover is used to perform final iron removal treatment on the mixed lithium battery powder. The dry powder iron remover is a separate iron removal device provided on the production line.

[0004] In the prior art, for the mixing of lithium battery powder materials, an air flow mixer is more commonly used. A typical air flow mixer is a mixture air flow conveying device (utility model patent authorization publication number CN221369515U), which includes an air flow mixer and a sending tank connected in an up-and-down manner. The air flow mixer includes a straight cylinder body, an inverted conical cylinder body connected to the lower port of the straight cylinder body, a pulse dust collector connected to the upper port of the straight cylinder body, a plurality of material feeding valves respectively arranged on the straight cylinder body, a gas homogenization device arranged on the inverted conical cylinder body, a boiling gas chamber connected to the lower port of the inverted conical cylinder body, and a discharge valve connected to the discharge pipeline at the lower end of the boiling gas chamber; the lower discharge port of the discharge pipeline is butt-jointed with the feeding port of the sending tank through a flexible connecting pipe; the air flow mixer is arranged on the upper frame, and a first weighing sensor is arranged between the air flow mixer and the upper frame; the sending tank is arranged on the lower frame, and a second weighing sensor is arranged between the sending tank and the lower frame.

[0005] However, the above production line of the dry pulverization and conveying system for lithium batteries respectively adopts the production processes of removing iron by a dry powder iron remover and mixing by an air flow mixer, and its deficiencies are as follows: Firstly, the purity of iron removal by the dry powder iron remover for iron microparticles is not high; in addition, the last iron removal process after the lithium battery powder is mixed and before packaging is set separately after the powder is mixed. On the one hand, setting up a dedicated independent iron removal process for lithium battery powder will increase the production time and reduce the production efficiency. On the other hand, the increase in processes will also increase the additional risk of mixing other heterogeneous elements due to the transfer of powder materials. Secondly, due to the different weights of various powders of lithium batteries (including the different weights caused by different powder densities and the different weights caused by different particle diameters), when the lithium battery powder is subjected to air flow mixing in the air flow mixer, the lighter powder will move upward into the upper feeding space due to the action of the mixed air flow to form a floating air flow layer of light microparticles, resulting in a state of upper and lower stratification and separation between the floating air flow layer of light microparticles and the main body mixed powder below after the material mixing is completed, thereby affecting the uniformity of the mixing of various powder materials. Summary of the Invention

[0006] In order to solve the above problems, the present invention proposes an on-line iron removal air flow mixer and a mixing and iron removal method for lithium ion battery powder, aiming to overcome the shortcomings of the prior art, improve the iron removal effect of lithium ion battery powder and the uniformity of mixing of lithium ion battery powder, and improve the production efficiency of lithium ion battery powder. The specific technical solutions are as follows:

[0007] An on-line iron removal air flow mixer for lithium ion battery powder includes a feed bin, a dust removal component arranged at the upper position of the feed bin, and an air flow mixing component docked at the lower position of the feed bin. The dust removal component includes a top cover arranged at the top of the feed bin, a dust removal filter element mounting plate arranged inside the feed bin, and a plurality of dust removal filter elements arranged on the dust removal filter element mounting plate. The dust removal filter element mounting plate divides the internal space of the feed bin into an upper chamber of the feed bin and a lower chamber of the feed bin. A feed pipe for adding powder materials is arranged on the lower chamber of the feed bin; the air flow mixing component includes an air flow mixing bin docked at the lower port position of the feed bin and a blowing component arranged on the air flow mixing bin for blowing air into the air flow mixing bin to realize material mixing; there is also a synchronous mixing on-line iron removal device for synchronously removing iron during the mixing of lithium ion battery powder. The synchronous mixing on-line iron removal device includes a plurality of electromagnetic iron removal rods arranged vertically at intervals inside the feed bin and passing through the dust removal filter element mounting plate, a lifting plate arranged in the upper chamber of the feed bin and fixedly connected to the upper ends of the plurality of electromagnetic iron removal rods respectively, and a first linear actuator arranged on the top cover and connected to the lifting plate to realize the up and down movement of the lifting plate and the electromagnetic iron removal rods.

[0008] Preferably, the first linear actuator is a cylinder or a servo electric cylinder.

[0009] Wherein, the upper chamber of the feed bin is connected to a negative pressure fan through a dust removal pipeline to form a negative pressure dust removal chamber.

[0010] As a further improvement of the present invention, an iron particle on-line automatic recycler is further provided on the synchronous mixing on-line iron removal device. The iron particle on-line automatic recycler includes an iron removal rod through hole provided on the dust removal filter element mounting plate and having a pore diameter larger than the outer diameter of the electromagnetic iron removal rod. A cylindrical sealing cover for covering the iron removal rod through hole from above is provided at the upper end of each iron removal rod through hole. A sealing hole for the electromagnetic iron removal rod to pass through in a sealed manner is provided at the top of the cylindrical sealing cover. A sealing member for sealing the outer circle of the electromagnetic iron removal rod is provided on the sealing hole. A section of extension sleeve located outside the electromagnetic iron removal rod is provided downward at the lower end of each iron removal rod through hole on the dust removal filter element mounting plate. A valve head is provided at the lower end of the electromagnetic iron removal rod; an interconnecting pipe communicating with each other is provided between the cylindrical sealing covers with the closest adjacent distance. Each cylindrical sealing cover is connected to an external dust collector for collecting iron particles through the interconnecting pipe and an iron removal hose connecting the interconnecting pipe; when the electromagnetic iron removal rod moves upward until its valve head contacts the lower end orifice of the extension sleeve, the lower end orifice of the extension sleeve is sealed, so as to form a sealed iron particle suction and iron removal space with negative pressure suction inside the cylindrical sealing cover.

[0011] Preferably, the valve head at the lower end of the electromagnetic iron removal rod is a non-ferromagnetic valve head.

[0012] Preferably, a soft sealing ring for achieving sealing fit with the valve head is provided at the position of the lower end orifice of the extension sleeve.

[0013] Preferably, the electromagnetic iron removal rod includes a pipe body, an iron core installed inside the pipe body, and a coil wound around the outer circle of the iron core. The non-ferromagnetic valve head is connected to the lower end of the pipe body.

[0014] Preferably, a hard alloy wear-resistant coating is provided on the surface of the pipe body of the electromagnetic iron removal rod and the surface of the non-ferromagnetic valve head.

[0015] Preferably, a wear-resistant ceramic material layer can also be sprayed on the surface of the pipe body of the electromagnetic iron removal rod.

[0016] Preferably, the non-ferromagnetic valve head can also be a non-ferromagnetic valve head made of wear-resistant ceramic material.

[0017] In the present invention, a dynamic seal connection is adopted between the dust removal filter element mounting plate and the bin wall of the feed bin.

[0018] In the present invention, the dust removal filter element is vertically arranged downward on the lower end surface of the dust removal filter element mounting plate; the extension sleeve is an iron removal filter element for forming an iron removal negative pressure air flow in the iron particle suction and iron removal sealed space, and the length dimension of the iron removal filter element in the up and down direction is shorter than the length dimension of the dust removal filter element in the up and down direction.

[0019] The length dimension of the iron removal filter element in the up and down direction is set to be shorter than the length dimension of the dust removal filter element in the up and down direction, so that when the dust removal filter element is back blown, the back blown air flow blown out from a section of filter holes at the lower part of the dust removal filter element can blow away the non-ferromagnetic powder on the adjacent electromagnetic iron removal rods, preventing the effective powder of the lithium battery from being mistakenly removed, thereby improving the accuracy of iron particle removal.

[0020] In the present invention, the plurality of dust removal filter elements and the plurality of electromagnetic iron removal rods are arranged alternately on the dust removal filter element mounting plate.

[0021] In order to improve the uniformity of powder material mixing, an air flow suppression component for suppressing the upward flowing air flow inside the lower chamber of the feed bin to prevent the separation of powder materials with different weights during powder material mixing is further provided in an on-line iron removal air flow mixer for lithium ion battery powder of the present invention. The air flow suppression component includes moving the dust removal filter element mounting plate in the up and down direction inside the feed bin, and a second linear actuator is provided on the top cover to connect the dust removal filter element mounting plate to realize the up and down movement of the dust removal filter element mounting plate.

[0022] Preferably, the second linear actuator is a cylinder or a servo electric cylinder.

[0023] Before the feeding operation, the lifting plate moves upward through the first linear actuator, driving the electromagnetic iron removal rod at the lower end of the lifting plate to move upward and away from the air flow mixing bin; at the same time, the dust removal filter element mounting plate moves upward through the second linear actuator, so that the space of the lower chamber of the feed bin is increased to form a sufficient feeding space; during the feeding process, the dust removal component works, so that there is no dust overflow when the external feeding pipe is inserted into the feeding pipe for feeding; after the feeding is completed, the pipe orifice of the feeding pipe is closed; when the powder materials are mixed, the lifting plate can be moved downward through the first linear actuator, driving the electromagnetic iron removal rod at the lower end of the lifting plate to move downward and insert into the powder in the air flow mixing bin, so as to realize on-line iron removal treatment while mixing the powder; at the same time, the dust removal filter element mounting plate can move downward through the second linear actuator, so that the space of the lower chamber of the feed bin is compressed, realizing the suppression of the upward flowing air flow inside the lower chamber of the feed bin.

[0024] In the present invention, a dynamic seal connection is adopted between the dust removal filter element mounting plate and the bin wall of the feed bin.

[0025] Preferably, the second linear actuator is a cylinder or a servo electric cylinder.

[0026] In the present invention, the air flow suppression assembly further includes a filter element backwashing device provided on the feed bin. The filter element backwashing device includes an air bag provided outside the feed bin and connected to a compressed air source, and a compressed air blowing pipe provided in the upper chamber of the feed bin and inserted into the inner cavity of the dust removal filter element. The compressed air blowing pipe is connected to the air bag through a backwashing pipeline; when the powder materials are mixed, the filter element backwashing device is also started to work, so that the backwashing air flow enters the feed bin through the dust removal filter element, so as to enhance the suppression effect on the upward air flow inside the feed bin.

[0027] Preferably, a pulse solenoid valve is provided on the backwashing pipeline of the filter element backwashing device, and the pulse solenoid valve is connected to the control system of the air flow mixer. The control system can realize continuous backwashing or pulse backwashing of the dust removal filter element through the pulse solenoid valve.

[0028] Preferably, when the dust removal filter element needs regular maintenance, the control system adopts pulse backwashing; when the powder materials are mixed, the control system adopts pulse backwashing or continuous backwashing to realize the suppression of the upward air flow inside the lower chamber of the feed bin.

[0029] As a further improvement of the present invention, the dust removal filter element includes a straight cylinder filter element and a conical plug connected to the lower end orifice of the straight cylinder filter element with the big end facing up. An internal air chamber is provided inside the conical plug, and backwashing suppression holes communicating with the internal air chamber are densely arranged on the outer conical surface of the conical plug. The internal air chamber of the conical plug is connected to the compressed air source through a backwashing suppression enhancement pipeline.

[0030] The backwashing suppression holes of the above conical plug have a larger aperture relative to the filtering holes of the straight cylinder filter element, so as to be able to blow out a stronger backwashing air flow.

[0031] Preferably, the backwashing suppression enhancement pipeline is connected to the compressed air source through the air bag.

[0032] Preferably, the flow rate of the backwashing air flow delivered to the filtering holes on the outer cylinder surface of the straight cylinder filter element is adjustable, and the flow rate of the backwashing air flow delivered to the backwashing suppression holes on the conical surface of the conical plug is adjustable, so as to further optimize and improve the performance of the air flow suppression assembly.

[0033] Preferably, one end of the backwashing pipeline and the backwashing suppression enhancement pipeline connected to the air bag is connected to an adjustable air flow distribution valve and then connected to the air bag. By providing the adjustable air flow distribution valve, a reasonable distribution of the compressed air flow inside the backwashing pipeline and the backwashing suppression enhancement pipeline is realized.

[0034] When the powder materials are mixed, a part of the backflush air flow diffuses laterally from the filter holes on the outer cylinder surface of the straight cylinder filter element through the backflush pipeline, forming a stable air pressure in the upper space of the lower chamber of the feeding bin. Another part of the backflush air flow diffuses obliquely downward from the backflush inhibition holes on the conical surface of the conical block through the backflush inhibition enhancement pipeline, forming a downward pressing air flow that inhibits the upward flow of the air flow, so that the air flow mixing space of the powder materials can be limited to a smaller space below the backflush air flow to achieve sufficient mixing, and further prevent the light powder from moving upward and separating from the heavy powder, thereby further improving the uniformity of the mixing of the light and heavy powders.

[0035] Preferably, a sliding sleeve is further connected to the outer edge of the dust removal filter element mounting plate, and a circular sealing airbag that is hermetically matched with the outer peripheral surface of the sliding sleeve is arranged on the inner wall of the feeding bin in a circle.

[0036] Preferably, the circular sealing airbag can also be arranged on the outer peripheral surface of the sliding sleeve.

[0037] Note that when the circular sealing airbag is arranged on the inner wall of the feeding bin, it is necessary to appropriately increase the height of the sliding sleeve on the dust removal filter element mounting plate in the vertical direction.

[0038] Preferably, the circular sealing airbag is externally connected to a compressed air source through a pipeline.

[0039] As a further improvement of the present invention, the blowing assembly is an enhanced bidirectional blowing assembly for strengthening the mixing effect of powder materials. The enhanced bidirectional blowing assembly includes a lateral blowing assembly arranged on the peripheral walls of the feeding bin for blowing lateral air flow into the air flow mixing bin, and a vertical blowing assembly arranged at the bottom position of the air flow mixing bin for blowing upward air flow into the air flow mixing bin; the lateral blowing assembly includes a first annular air ring arranged outside the feeding bin and connected to a compressed air source, a plurality of blowing seat plates arranged on the wall of the air flow mixing bin at circumferential intervals along the wall of the air flow mixing bin, lateral blowing holes densely arranged on the blowing seat plates and communicating with the inside of the air flow mixing bin, and a blowing cover for covering the lateral blowing holes on the blowing seat plates. A blowing chamber is formed between the blowing seat plate and the blowing cover, and the blowing chamber is connected to the first annular air ring through a blowing pipeline; a pulse solenoid valve is arranged on the blowing pipeline; the air flow mixing bin is a conical air flow mixing bin with a large opening facing upward, and the blowing direction of the lateral blowing holes is obliquely upward along the lateral direction towards the inside of the air flow mixing bin.

[0040] The lateral blowing assembly and the vertical blowing assembly of the above air flow mixing components cooperate with each other to further improve the uniformity of the mixing of powder materials.

[0041] Preferably, an inner flange is connected to the bottom orifice of the air flow mixing chamber. A discharge cone tube with a large opening facing upward is connected downward at the inner hole position of the inner flange. A discharge cylinder is vertically provided upward at the central part inside the discharge cone tube. The piston rod of the discharge cylinder is arranged upward and is connected with an umbrella valve for discharging at its top. The vertical air blowing assembly includes a second annular air ring arranged outside the air flow mixing chamber and connected to a compressed air source, a plurality of vertical air blowing holes vertically arranged on the inner flange and spaced circumferentially along the inner flange, a vertical air blowing pipe butt-connected to the lower end of the vertical air blowing hole and communicating with the second annular air ring, and a fluidization cylinder vertically arranged at the lower end of the vertical air blowing pipe. The piston rod of the fluidization cylinder is arranged upward and enters the vertical air blowing pipe. A valve plug for opening or closing the vertical air blowing hole is arranged at the top end of the piston rod of the fluidization cylinder.

[0042] Preferably, a discharge straight pipe is connected to the lower end of the discharge cone tube, and a wafer - type pneumatic butterfly valve for discharging is arranged on the discharge straight pipe.

[0043] An on - line iron removal air flow mixing method for an on - line iron removal air flow mixer of lithium - ion battery powder includes the following steps:

[0044] (1) Preparation: The control system drives the first linear actuator, so that the lifting plate drives the electromagnetic iron removal rod to move upward synchronously. The electromagnetic iron removal rod is moved upward to a position above the air flow mixing chamber.

[0045] (2) Feeding: The powder material is added into the feed bin through the feed pipe on the lower chamber of the feed bin. When feeding, the dust removal component on the upper part of the feed bin is turned on to prevent powder overflow. After feeding is completed, the feed pipe is closed.

[0046] (3) First mixing: The horizontal air blowing assembly and the vertical air blowing assembly on the air flow mixing chamber are turned on. Under the combined action of the obliquely upward horizontal air flow of the horizontal air blowing assembly and the vertically upward vertical air flow of the vertical air blowing assembly, the powder material is mixed for the first time in the air flow mixing chamber.

[0047] (4)Second mixing and iron removal: After the first mixing is completed, the control system drives the first linear actuator, causing the lifting plate to drive the electromagnetic iron removal rods to move downward synchronously. Each of the electromagnetic iron removal rods is inserted into the powder material in the air flow mixing chamber, and the power supply of the electromagnetic iron removal rods is turned on, so that a magnetic adsorption force is generated on the outer surface of the electromagnetic iron removal rods. Under the combined action of the obliquely upward horizontal air flow of the horizontal air blowing assembly and the vertically upward vertical air flow of the vertical air blowing assembly, the powder material undergoes a second mixing in the air flow mixing chamber. During the second mixing, the material in the air flow mixing chamber is continuously in contact with the electromagnetic iron removal rods while mixing, and the iron particles in the powder are adsorbed on the electromagnetic iron removal rods, realizing on-line iron removal and air flow mixing of the powder material.

[0048] (5)Discharging: After the second mixing and iron removal are completed, the horizontal air blowing assembly and the vertical air blowing assembly are turned off, and the discharging cylinder is opened, causing the umbrella valve to move upward and open. The mixed powder material enters the discharge cone tube, and the wafer type pneumatic butterfly valve on the discharge straight pipe at the lower end of the discharge cone tube is opened to realize the discharging of the powder material.

[0049] (6)On-line automatic recovery of iron particles: After the discharging is completed, the control system drives the first linear actuator, causing the lifting plate to drive the electromagnetic iron removal rods to move upward synchronously until the valve head at the lower end of the electromagnetic iron removal rod contacts the lower end orifice of the extension sleeve, thereby forming a negative pressure suction iron particle suction and iron removal sealing space inside the cylindrical sealing cover, the iron removal rod through hole, and the extension sleeve, and causing the iron particles adsorbed on the electromagnetic iron removal rods to be surrounded in the iron particle suction and iron removal sealing space composed of the cylindrical sealing cover, the iron removal rod through hole, and the extension sleeve. The external vacuum cleaner connected to the interconnecting pipe of the cylindrical sealing cover is turned on, and the power supply of the electromagnetic iron removal rods is turned off. The electromagnetic iron removal rods lose the magnetic adsorption force, resulting in the iron particles adsorbed on the electromagnetic iron removal rods being sucked away by negative pressure and entering the external vacuum cleaner to be collected.

[0050] Repeat the above steps (1) to (6) to realize the coordinated operation of continuous on-line iron removal and air flow mixing of the powder material.

[0051] As a further improvement of the powder online iron removal air flow mixing method of a lithium-ion battery powder online iron removal air flow mixer in the present invention, in at least one of the mixing steps of the first mixing in step (3) and the second mixing and iron removal in step (4), the second linear actuator is also turned on, so that the dust removal filter element mounting plate of the dust removal component moves downward, thereby making the space of the lower chamber of the feed bin located below the dust removal filter element mounting plate compressed and become smaller; under the combined action of the obliquely upward lateral air flow of the lateral blowing assembly and the vertically upward vertical air flow of the vertical blowing assembly, and under the synergistic action of the downward movement of the dust removal filter element mounting plate, the powder material is compressed in a smaller air flow mixing space to achieve boiling fluidization, so that the materials are fully mixed; in at least one of the mixing steps of the first mixing in step (3) and the second mixing and iron removal in step (4), the filter element backwashing device is also correspondingly turned on, so that when the powder materials are mixed, a part of the backwashing air flow diffuses laterally from the filter holes on the outer cylinder surface of the straight cylinder filter element, forming a stable air pressure in the upper space of the lower chamber of the feed bin, and another part of the backwashing air flow diffuses obliquely downward from the backwashing suppression holes on the conical surface of the conical blockage, forming a downward pressing air flow that inhibits the upward movement of the air flow, so as to limit the mixing space of the powder materials in a smaller space below the backwashing air flow for full mixing, playing a role in further preventing the light powder from moving upward and separating from the heavy powder.

[0052] Preferably, in the online automatic recovery of iron particles in step (6), the filter element backwashing device is not turned off. During the upward movement of the electromagnetic iron rod, relying on the backwashing air flow diffusing laterally from the filter holes of a section of the straight cylinder filter element lower than the extension sleeve in the straight cylinder filter element adjacent to the periphery of the electromagnetic iron rod, and the backwashing air flow diffusing obliquely downward from the backwashing suppression holes on the outer conical surface of the conical blockage at the lower end of the straight cylinder filter element, the non-iron particles adhering to the surface of the electromagnetic iron rod are pre-blow away and will not enter the iron particle suction and iron removal sealed space.

[0053] The beneficial effects of the present invention are:

[0054] First, for a lithium-ion battery powder online iron removal air flow mixer and a mixing and iron removal method of the present invention, by setting a synchronous mixing and online iron removal device for synchronous online iron removal during the mixing of lithium-ion battery powder on the air flow mixer, the coordinated operation of continuous online iron removal and air flow mixing of lithium-ion battery powder materials is realized. The dispersedly arranged electromagnetic iron rods can fully contact the powder materials in the air flow mixing cycle, thereby improving the iron removal effect of lithium-ion battery powder. And because the separate iron removal process is omitted, the production efficiency of lithium-ion battery powder is thus improved.

[0055] Second, for the on-line iron removal air flow mixer and mixing iron removal method of a lithium-ion battery powder according to the present invention, an iron particle on-line automatic recycler is further provided on the synchronous mixing on-line iron removal device. After the electromagnetic iron removal rod retracts each time the mixing is completed, an iron particle suction iron removal sealed space with negative pressure suction can be formed inside the cylindrical sealing cover, so as to timely clean the iron particles adsorbed on the electromagnetic iron removal rod, thus ensuring the magnetic adsorption performance of the electromagnetic iron removal rod during the next mixing.

[0056] Third, for the on-line iron removal air flow mixer and mixing iron removal method of a lithium-ion battery powder according to the present invention, the dust removal filter element and the electromagnetic iron removal rod are arranged alternately on the dust removal filter element mounting plate, ensuring that there are several dust removal filter elements adjacent to each electromagnetic iron removal rod. During the retraction process of the electromagnetic iron removal rod after each mixing is completed, the filter element backwashing device is not closed, and the non-iron particle powder adhering to the electromagnetic iron removal rod can be blown away by the backwashing action of the adjacent dust removal filter element and will not enter the iron particle suction iron removal sealed space, thus avoiding the miscleaning of the effective element powder in the lithium battery, reducing the loss of the lithium battery powder, and improving the accuracy of the lithium battery powder formula.

[0057] Fourth, for the on-line iron removal air flow mixer and mixing iron removal method of a lithium-ion battery powder according to the present invention, an air flow suppression component is provided on the feed bin. Through a linear actuator, the dust removal filter element mounting plate can be lowered to a position close to the upper part of the air flow mixing bin, so that the air flow mixing space of the powder material can be compressed in the air flow mixing bin below the dust removal filter element mounting plate, thus effectively reducing the probability of the lighter powder material rising with the air flow to the upper part of the lower chamber of the feed bin, achieving the effect of preventing the separation of the lighter powder material from the heavier powder material due to the upward movement of the mixing air flow during the mixing process, and thereby improving the uniformity of the air flow mixing of the powder material.

[0058] Fifth, for the on-line iron removal air flow mixer and mixing iron removal method of a lithium-ion battery powder according to the present invention, the improved structure of the air flow suppression component further includes a filter element backwashing device connected to the dust removal component. During the air flow mixing process, opening the filter element backwashing device can form a stable air flow layer in the lower chamber of the feed bin to suppress the upward movement of the mixing air flow, thereby further compressing the air flow mixing space of the powder material and improving the uniformity of the air flow mixing of the powder material.

[0059] Sixth, for the on-line iron removal air flow mixer and mixing and iron removal method of a lithium-ion battery powder of the present invention, the improved structure of the air flow suppression component further includes an anti-blowing suppression hole provided on the conical plug at the lower end of the straight cylinder filter element. When the powder material is mixed, a part of the anti-blowing air flow diffuses laterally from the filter holes on the outer cylinder surface of the straight cylinder filter element through the anti-blowing pipeline, forming a stable air pressure flow that enhances the upper space of the lower chamber of the feeding bin. Another part of the anti-blowing air flow diffuses obliquely downward from the anti-blowing suppression holes on the conical surface of the conical plug through the anti-blowing suppression enhancement pipeline, forming a downward pressing air flow that suppresses the upward movement of the air flow, so that the air flow mixing space of the powder material can be limited to a smaller space below the anti-blowing air flow to achieve full mixing, playing a role in further preventing the light powder from moving upward and separating from the heavy powder, thereby further improving the uniformity of the mixing of the light and heavy powders.

[0060] Seventh, for the on-line iron removal air flow mixer and mixing and iron removal method of a lithium-ion battery powder of the present invention, a conical discharge door is provided below the air flow mixing bin. While facilitating discharging, the conical structure of the conical discharge door is beneficial to the repeated re-aggregation and re-mixing of the powder material during the air flow mixing process, thereby further improving the uniformity of the mixing of the powder material.

[0061] Eighth, for the on-line iron removal air flow mixer and mixing and iron removal method of a lithium-ion battery powder of the present invention, during the powder mixing process, the blowing component, the air flow suppression component and the on-line iron removal device cooperate with each other, improving the comprehensive performance of the air flow mixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 is a schematic structural diagram of an on-line iron removal air flow mixer for a lithium-ion battery powder of the present invention;

[0063] Figure 2 is a three-dimensional structural diagram of the on-line iron removal air flow mixer;

[0064] Figure 3 is a schematic internal structure diagram of the on-line iron removal air flow mixer;

[0065] Figure 4 is Figure 3 a partial enlarged view of

[0066] Figure 5 is a schematic structural diagram of an anti-blowing pipeline and an anti-blowing suppression enhancement pipeline provided on the dust removal filter element.

[0067] In the figure: 1, feed bin; 2, dust removal component; 3, air flow mixing component; 4, top cover; 5, dust removal filter element mounting plate; 6, dust removal filter element; 7, upper chamber of the feed bin; 8, lower chamber of the feed bin; 9, feed pipe; 10, air flow mixing bin; 11, air flow suppression component; 12, second linear actuator; 13, filter element backwashing device; 14, air bag; 15, compressed air injection pipe; 16, backwashing pipeline; 17, pulse solenoid valve; 18, straight barrel filter element; 19, conical plug; 20, internal air chamber; 21, backwashing suppression hole; 22, backwashing suppression enhancement pipeline; 23, sliding sleeve; 24, annular sealing air bag; 25, transverse air injection component; 26, vertical air injection component; 27, first annular air ring; 28, air injection seat plate; 29, transverse air injection hole; 30, air injection cover; 31, air injection pipeline; 33, inner flange; 34, discharge cone pipe; 35, discharge cylinder; 36, umbrella valve; 37, second annular air ring; 38, vertical air injection hole; 39, vertical air injection pipe; 40, fluidization cylinder; 41, valve plug; 42, discharge straight pipe; 43, wafer type pneumatic butterfly valve; 44, synchronous mixing on-line iron removal device; 45, electromagnetic iron removal rod; 46, lifting plate; 47, first linear actuator; 48, cylindrical sealing cover; 49, seal; 50, extension sleeve (iron removal filter element); 51, valve head; 52, interconnection pipe. Detailed implementation mode

[0068] The following combines the drawings and embodiments to further describe the detailed implementation mode of the present invention. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Embodiment 1:

[0069] As Figures 1 to 5The following shows an embodiment of an on-line iron removal air flow mixer for lithium-ion battery powder according to the present invention, which includes a feed bin 1, a dust removal component 2 arranged at the upper position of the feed bin 1, and an air flow mixing component 3 docked at the lower position of the feed bin 1. The dust removal component 2 includes a top cover 4 arranged at the top of the feed bin 1, a dust removal filter element mounting plate 5 arranged inside the feed bin 1, and a plurality of dust removal filter elements 6 arranged on the dust removal filter element mounting plate 5. The dust removal filter element mounting plate 5 divides the internal space of the feed bin 1 into an upper chamber 7 of the feed bin and a lower chamber 8 of the feed bin. A feed pipe 9 for adding powder materials is arranged on the lower chamber 8 of the feed bin; the air flow mixing component 3 includes an air flow mixing bin 10 docked at the lower port position of the feed bin 1 and a blowing component arranged on the air flow mixing bin 10 for blowing air into the air flow mixing bin 10 to achieve material mixing; there is also provided a synchronous mixing on-line iron removal device 44 for synchronous on-line iron removal during the mixing of lithium-ion battery powder. The synchronous mixing on-line iron removal device 44 includes a plurality of electromagnetic iron removal rods 45 arranged vertically at intervals inside the feed bin 1 and passing through the dust removal filter element mounting plate 5, a lifting plate 46 arranged in the upper chamber 7 of the feed bin and fixedly connected to the upper ends of the plurality of electromagnetic iron removal rods 45 respectively, and a first linear actuator 47 arranged on the top cover 4 and connected to the lifting plate 46 to realize the up and down movement of the lifting plate 46 and the electromagnetic iron removal rods 45.

[0070] Preferably, the first linear actuator 47 is a cylinder or a servo electric cylinder.

[0071] Among them, the upper chamber 7 of the feed bin is connected to a negative pressure fan through a dust removal pipeline to form a negative pressure dust removal chamber.

[0072] As a further improvement of this embodiment, an online automatic iron particle recycler is also provided on the synchronous hybrid online iron removal device 44. The online automatic iron particle recycler includes a through-hole for the iron removal rod provided on the dust removal filter element mounting plate 5 and having a diameter larger than the outer diameter of the electromagnetic iron removal rod 45. At the upper end of each through-hole for the iron removal rod, a cylindrical sealing cover 48 is provided for covering the through-hole for the iron removal rod from above. A sealing hole for the electromagnetic iron removal rod 45 to pass through is provided at the top of the cylindrical sealing cover 48, and a sealing member 49 for sealing the outer circle of the electromagnetic iron removal rod 45 is provided on the sealing hole. At the lower end of each through-hole for the iron removal rod located on the dust removal filter element mounting plate 5, an extension sleeve 50 located outside the electromagnetic iron removal rod 45 extends downward. A valve head 51 is provided at the lower end of the electromagnetic iron removal rod 45. An interconnecting pipe 52 is provided between the cylindrical sealing covers 48 with the closest adjacent distance for mutual connection. Each cylindrical sealing cover 48 is connected to an external vacuum cleaner for collecting iron particles through the interconnecting pipe 52 and an iron removal hose connecting the interconnecting pipe 52. When the electromagnetic iron removal rod 45 moves upward until its valve head 51 contacts the lower end orifice of the extension sleeve 50, the lower end orifice of the extension sleeve 50 is sealed, thereby forming a sealed space for sucking and removing iron particles with negative pressure suction inside the cylindrical sealing cover 48.

[0073] Preferably, the valve head 51 at the lower end of the electromagnetic iron removal rod 45 is a non-ferromagnetic valve head.

[0074] Preferably, a soft sealing ring for achieving sealing cooperation with the valve head 51 is provided at the position of the lower end orifice of the extension sleeve 50.

[0075] Preferably, the electromagnetic iron removal rod 45 includes a pipe body, an iron core installed inside the pipe body, and a coil wound around the outer circle of the iron core. The non-ferromagnetic valve head is connected to the lower end of the pipe body.

[0076] Preferably, a hard alloy wear-resistant coating is provided on the surface of the pipe body of the electromagnetic iron removal rod 45 and the surface of the non-ferromagnetic valve head 51.

[0077] Preferably, a wear-resistant ceramic material layer can also be sprayed on the surface of the pipe body of the electromagnetic iron removal rod 45.

[0078] Preferably, the non-ferromagnetic valve head 51 can also be a non-ferromagnetic valve head made of wear-resistant ceramic material.

[0079] In this embodiment, a dynamic seal connection is adopted between the dust removal filter element mounting plate 5 and the wall of the feed bin 1.

[0080] In this embodiment, the dust removal filter element 6 is vertically arranged downward on the lower end surface of the dust removal filter element mounting plate 5; the extension sleeve 50 is an iron removal filter element for forming an iron removal negative pressure air flow in the iron particle suction and iron removal sealing space, and the length dimension of the iron removal filter element in the vertical direction is shorter than the length dimension of the dust removal filter element 6 in the vertical direction.

[0081] The length dimension of the iron removal filter element (extension sleeve 50) in the vertical direction is set to be shorter than the length dimension of the dust removal filter element in the vertical direction, so that when the dust removal filter element 6 is backflushed, the backflushed air flow blown out from a section of filter holes at the lower part of the dust removal filter element 6 can blow away the non-ferromagnetic powder on the adjacent electromagnetic iron removal rod 45, preventing the effective powder of the lithium battery from being mistakenly removed, thereby improving the accuracy of iron particle removal.

[0082] In this embodiment, the several dust removal filter elements 6 and the several electromagnetic iron removal rods 45 are arranged alternately on the dust removal filter element mounting plate 5.

[0083] In order to improve the uniformity of powder material mixing, an air flow inhibiting component 11 is further provided in an on-line iron removal air flow mixer for lithium ion battery powder in this embodiment, which is used to inhibit the upward flowing air inside the lower chamber 8 of the feed bin during powder material mixing to prevent the separation of powder materials with different weights. The air flow inhibiting component 11 includes a second linear actuator 12 that movably arranges the dust removal filter element mounting plate 5 in the vertical direction inside the feed bin 1, and a connection to the dust removal filter element mounting plate 5 is provided on the top cover 4 to realize the vertical movement of the dust removal filter element mounting plate 5.

[0084] Preferably, the second linear actuator 12 is a cylinder or a servo electric cylinder.

[0085] Before the feeding operation, the lifting plate 46 moves upward through the first linear actuator 47, driving the electromagnetic iron removal rod 45 at the lower end of the lifting plate 46 to move upward and away from the air flow mixing chamber 10; at the same time, the dust removal filter element mounting plate 5 moves upward through the second linear actuator 12, so that the space of the lower chamber 8 of the feed bin is increased to form a sufficient feeding space; during the feeding process, the dust removal component 2 works, so that there is no dust overflow when the external feeding pipe is inserted into the feeding pipe 9 for feeding; after the feeding is completed, the pipe orifice of the feeding pipe 9 is closed; when the powder materials are mixed, the lifting plate 46 can be moved downward through the first linear actuator 47, driving the electromagnetic iron removal rod 45 at the lower end of the lifting plate 46 to move downward and insert into the powder in the air flow mixing chamber 19, so as to realize on-line iron removal treatment while mixing the powder; at the same time, the dust removal filter element mounting plate 5 can move downward through the second linear actuator 12, so that the space of the lower chamber 8 of the feed bin is compressed, realizing the inhibition of the upward flowing air inside the lower chamber 8 of the feed bin.

[0086] In this embodiment, a dynamic seal connection is adopted between the dust removal filter element mounting plate 5 and the wall of the feed bin 1.

[0087] Preferably, the second linear actuator 12 is a cylinder or a servo electric cylinder.

[0088] In this embodiment, the air flow suppression assembly 11 further includes a filter element backwashing device 13 provided on the feed bin 1. The filter element backwashing device 13 includes an air bag 14 provided outside the feed bin 1 and connected to a compressed air source, and a compressed air blowing pipe 15 provided in the upper chamber 7 of the feed bin and inserted into the inner cavity of the dust removal filter element 6. The compressed air blowing pipe 15 is connected to the air bag 14 through a backwashing pipeline 16. When the powder materials are mixed, the filter element backwashing device 13 is also started to work, so that the backwashing air flow enters the feed bin 1 through the dust removal filter element 6 to enhance the suppression effect on the upward air flow inside the feed bin 1.

[0089] Preferably, a pulse solenoid valve 17 is provided on the backwashing pipeline 16 of the filter element backwashing device 13, and the pulse solenoid valve 17 is connected to the control system of the air flow mixer. The control system can achieve continuous backwashing or pulse backwashing of the dust removal filter element 6 through the pulse solenoid valve 17.

[0090] Preferably, when the dust removal filter element 6 needs to be maintained regularly, the control system adopts pulse backwashing; when the powder materials are mixed, the control system adopts pulse backwashing or continuous backwashing to achieve the suppression of the upward air flow inside the lower chamber 8 of the feed bin.

[0091] As a further improvement of this embodiment, the dust removal filter element 6 includes a straight cylinder filter element 18 and a conical plug 19 connected to the lower end orifice of the straight cylinder filter element 18 with the large head facing up. An internal air chamber 20 is provided inside the conical plug 19, and backwashing suppression holes 21 communicating with the internal air chamber 20 are densely arranged on the outer conical surface of the conical plug 19. The internal air chamber 20 of the conical plug 19 is connected to a compressed air source through a backwashing suppression enhancement pipeline 22.

[0092] The backwashing suppression holes 21 of the above conical plug 19 have a larger aperture than the filtering holes of the straight cylinder filter element 18, so as to be able to blow out a stronger backwashing air flow.

[0093] Preferably, the backwashing suppression enhancement pipeline 22 is connected to the compressed air source through the air bag 14.

[0094] Preferably, the flow rate of the backwashing air flow delivered to the filtering holes on the outer cylinder surface of the straight cylinder filter element 18 is adjustable, and the flow rate of the backwashing air flow delivered to the backwashing suppression holes 21 on the conical surface of the conical plug 19 is adjustable to further optimize and improve the performance of the air flow suppression assembly 11.

[0095] Preferably, one end of the backflush pipeline 16 and the backflush suppression enhancement pipeline 22 connected to the air bag 14 is connected to an adjustable air flow distribution valve and then connected to the air bag 14. By setting the adjustable air flow distribution valve, a reasonable distribution of the compressed air flow inside the backflush pipeline 16 and the backflush suppression enhancement pipeline 22 is achieved.

[0096] When the powder materials are mixed, a part of the backflush air flow laterally backflushes and diffuses out from the filter holes on the outer cylinder surface of the straight cylinder filter element 18 through the backflush pipeline 16, forming a stable air pressure in the upper space of the lower chamber 8 of the feeding bin. Another part of the backflush air flow obliquely backflushes and diffuses downward from the backflush suppression holes 21 on the conical surface of the conical plug 19 through the backflush suppression enhancement pipeline 22, forming a downward pressing air flow that suppresses the upward flow of the air flow, so that the air flow mixing space of the powder materials can be limited to a smaller space below the backflush air flow to achieve full mixing, and further prevent the light powder from moving upward and separating from the heavy powder, thereby further improving the uniformity of the mixing of the light and heavy powders.

[0097] Preferably, a sliding sleeve 23 is further connected to the outer edge of the dust removal filter element mounting plate 5, and an annular sealing air bag 24 that is sealingly matched with the outer peripheral surface of the sliding sleeve 23 is arranged on the inner wall of the feeding bin 1 in a circle.

[0098] Preferably, the annular sealing air bag 24 can also be arranged on the outer peripheral surface of the sliding sleeve 23.

[0099] Note that when the annular sealing air bag 24 is arranged on the inner wall of the feeding bin 1, it is necessary to appropriately increase the height of the sliding sleeve 23 on the dust removal filter element mounting plate 5 in the up and down direction.

[0100] Preferably, the annular sealing air bag 24 is externally connected to a compressed air source through a pipeline.

[0101] As a further improvement of this embodiment, the air blowing assembly is an enhanced bidirectional air blowing assembly for strengthening the mixing effect of powder materials. The enhanced bidirectional air blowing assembly includes a lateral air blowing assembly 25 disposed on the peripheral side walls of the feeding bin 1 for blowing lateral air into the air flow mixing bin 10, and a vertical air blowing assembly 26 disposed at the bottom of the air flow mixing bin 10 for blowing upward air into the air flow mixing bin 10. The lateral air blowing assembly 25 includes a first annular air ring 27 disposed outside the feeding bin 1 and connected to a compressed air source, a plurality of blowing seat plates 28 disposed on the side wall of the air flow mixing bin 10 and arranged at intervals along the circumferential direction of the side wall of the air flow mixing bin 10, a plurality of lateral blowing holes 29 densely disposed on the blowing seat plates 28 and communicating with the interior of the air flow mixing bin 10, and a blowing cover 30 for covering the lateral blowing holes 29 on the blowing seat plates 28. A blowing chamber is formed between the blowing seat plates 28 and the blowing cover 30, and the blowing chamber is connected to the first annular air ring 27 through a blowing pipeline 31. A pulse solenoid valve 17 is disposed on the blowing pipeline 31. The air flow mixing bin 10 is a conical air flow mixing bin with a large opening facing upward, and the blowing direction of the lateral blowing holes 29 is inclined upward along the lateral direction towards the interior of the air flow mixing bin 10.

[0102] The lateral air blowing assembly 25 and the vertical air blowing assembly 26 of the above air flow mixing components cooperate with each other to further improve the uniformity of powder material mixing.

[0103] Preferably, an inner flange 33 is connected to the bottom orifice of the air flow mixing bin 10. A discharge cone pipe 34 with a large opening facing upward is connected downward at the inner hole position of the inner flange 33. A discharge cylinder 35 is vertically erected at the central part inside the discharge cone pipe 34. The piston rod of the discharge cylinder 35 faces upward and is connected with an umbrella valve 36 for discharging at its top. The vertical air blowing assembly 26 includes a second annular air ring 37 disposed outside the air flow mixing bin 10 and connected to a compressed air source, a plurality of vertical blowing holes 38 vertically disposed on the inner flange 33 and arranged at intervals along the circumferential direction of the inner flange 33, a vertical blowing pipeline 39 docked at the lower end of the vertical blowing holes 38 and communicating with the second annular air ring 37, and a fluidization cylinder 40 vertically disposed at the lower end of the vertical blowing pipeline 39. The piston rod of the fluidization cylinder 40 faces upward and enters the vertical blowing pipeline 39. A valve plug 41 for opening or closing the vertical blowing holes 38 is disposed at the top end of the piston rod of the fluidization cylinder 40.

[0104] Preferably, a discharge straight pipe 42 is connected to the lower end of the discharge cone pipe 34, and a wafer type pneumatic butterfly valve 43 for discharging is disposed on the discharge straight pipe 42. Embodiment 2:

[0105] An on-line iron removal and air flow mixing method for an on-line iron removal air flow mixer of a lithium-ion battery powder, comprising the following steps:

[0106] (1) Preparation: The control system drives the first linear actuator 47, so that the lifting plate 46 drives the electromagnetic iron removal rod 45 to move upward synchronously, and the electromagnetic iron removal rod 45 is moved upward to a position above the air flow mixing chamber 10;

[0107] (2) Feeding: The powder material is added into the feed bin 1 through the feed pipe 9 on the lower chamber 7 of the feed bin. When feeding, the dust removal component 2 above the feed bin 1 is turned on to prevent powder overflow; after feeding is completed, the feed pipe 9 is closed;

[0108] (3) First mixing: The horizontal blowing component 25 and the vertical blowing component 26 on the air flow mixing chamber 20 are turned on. Under the combined action of the obliquely upward horizontal air flow of the horizontal blowing component 25 and the vertically upward vertical air flow of the vertical blowing component 26, the powder material is first mixed in the air flow mixing chamber 10;

[0109] (4) Second mixing and iron removal: After the first mixing is completed, the control system drives the first linear actuator 47, so that the lifting plate 46 drives the electromagnetic iron removal rod 45 to move downward synchronously, and each electromagnetic iron removal rod 45 is inserted into the powder material in the air flow mixing chamber 10. The power supply of the electromagnetic iron removal rod 45 is turned on, so that a magnetic adsorption force is generated on the outer surface of the electromagnetic iron removal rod 45; under the combined action of the obliquely upward horizontal air flow of the horizontal blowing component 25 and the vertically upward vertical air flow of the vertical blowing component 26, the powder material is secondarily mixed in the air flow mixing chamber 10; during the second mixing, the material continuously contacts the electromagnetic iron removal rod 45 while being mixed in the air flow mixing chamber 10, and the iron fine particles in the powder are adsorbed on the electromagnetic iron removal rod 45, realizing on-line iron removal and air flow mixing of the powder material;

[0110] (5) Discharging: After the second mixing and iron removal are completed, the horizontal blowing component 25 and the vertical blowing component 26 are closed, and the discharging cylinder 35 is turned on, so that the umbrella valve 36 moves upward to open, and the mixed powder material enters the discharge cone pipe 34. The clamp type pneumatic butterfly valve 43 on the discharge straight pipe 42 at the lower end of the discharge cone pipe 34 is opened to realize discharging of the powder material.

[0111] (6)Online automatic recovery of iron particles: After the discharging is completed, the control system drives the first linear actuator 47, so that the lifting plate 46 drives the electromagnetic iron removal rod 45 to move upward synchronously until the valve head at the lower end of the electromagnetic iron removal rod 45 contacts the lower orifice of the extension sleeve 50, thereby forming a sealed iron particle suction and iron removal space with negative pressure suction inside the cylindrical sealing cover 48, the iron removal rod through-hole and the extension sleeve 50, and making the iron particles adsorbed on the electromagnetic iron removal rod 45 be surrounded in the sealed iron particle suction and iron removal space composed of the cylindrical sealing cover 48, the iron removal rod through-hole and the extension sleeve 50; turn on the external vacuum cleaner connected to the interconnecting pipe 52 of the cylindrical sealing cover 48, turn off the power supply of the electromagnetic iron removal rod 45, and the electromagnetic iron removal rod 45 loses its magnetic adsorption force, resulting in the iron particles adsorbed on the electromagnetic iron removal rod 45 being sucked away by negative pressure and entering the external vacuum cleaner to be collected.

[0112] Repeat the above steps (1) to (6) to achieve the collaborative operation of continuous online iron removal and air flow mixing of powder materials.

[0113] As a further improvement of the powder online iron removal and air flow mixing method of the lithium-ion battery powder online iron removal and air flow mixer in this embodiment, in at least one of the mixing steps of the first mixing in step (3) and the second mixing and iron removal in step (4), the second linear actuator 12 is also turned on, so that the dust removal filter element mounting plate 5 of the dust removal component 2 moves downward, thereby making the space of the lower chamber 8 of the feed bin located below the dust removal filter element mounting plate 5 compressed and become smaller; under the combined action of the obliquely upward horizontal air flow of the horizontal air blowing assembly 25 and the vertically upward vertical air flow of the vertical air blowing assembly 26, and under the collaborative action of the downward movement of the dust removal filter element mounting plate 5, the powder material is compressed in a smaller air flow mixing space to achieve boiling fluidization, so that the material is fully mixed; in at least one of the mixing steps of the first mixing in step (3) and the second mixing and iron removal in step (4), the filter element backwashing device 13 is also correspondingly turned on, so that when the powder material is mixed, a part of the backwashing air flow diffuses horizontally from the filter holes on the outer cylinder surface of the straight cylinder filter element 18 to form a stable air pressure in the upper space of the lower chamber 8 of the feed bin, and another part of the backwashing air flow diffuses obliquely downward from the backwashing suppression holes on the conical surface of the conical plug 19 to form a downward pressing air flow that inhibits the upward movement of the air flow, thereby restricting the mixing space of the powder material within a smaller space below the backwashing air flow for full mixing, playing a role in further preventing the light powder from moving upward and separating from the heavy powder.

[0114] Preferably, in the online automatic recovery of iron particles in step (6), the filter element backwashing device 13 is not closed. During the upward movement of the electromagnetic iron removal rod 45, relying on the backwashing air flow diffused transversely from the filter holes of a section of the straight cylinder filter element 18 below the extension sleeve 50 in the straight cylinder filter element 18 adjacent to the periphery of the electromagnetic iron removal rod 45, and the obliquely downward backwashing air flow diffused from the backwashing suppression holes on the outer conical surface of the conical plug 19 at the lower end of the straight cylinder filter element 18, the non-iron particles adhered to the surface of the electromagnetic iron removal rod 45 are pre-blow away and will not enter the iron particle suction and iron removal sealed space.

[0115] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An on-line iron removal air flow mixer for lithium ion battery powder, characterized in that, The invention comprises a feed bin, a dust removal component arranged at the upper position of the feed bin and an air flow mixing component connected to the lower position of the feed bin, wherein the dust removal component comprises a top cover arranged on the top of the feed bin, a dust filter element mounting plate arranged inside the feed bin, and a number of dust filter elements arranged on the dust filter element mounting plate, wherein the dust filter element mounting plate divides the internal space of the feed bin into an upper chamber of the feed bin and a lower chamber of the feed bin, and a feed pipe for adding powder materials is arranged on the lower chamber of the feed bin; the air flow mixing component comprises an air flow mixing bin connected to the lower port position of the feed bin and an air flow mixing bin arranged at the lower port position of the feed bin. The airflow mixing bin is provided with an air blowing assembly for blowing airflow into the airflow mixing bin to achieve material mixing; a synchronous mixing online iron removal device is also provided for synchronous online iron removal when mixing lithium-ion battery powders, and the synchronous mixing online iron removal device comprises a number of electromagnetic iron removal rods arranged vertically at intervals inside the feed bin and passing through the dust filter element mounting plate, a lifting plate provided in the upper chamber of the feed bin and respectively fixedly connected to the upper ends of the number of electromagnetic iron removal rods, and a first linear actuator provided on the top cover and connected to the lifting plate to achieve the up and down movement of the lifting plate and the electromagnetic iron removal rods; The synchronous hybrid online iron removal device is also provided with an online automatic iron particle recoverer, and the online automatic iron particle recoverer includes an iron removal rod passing hole arranged on the dust removal filter element mounting plate and having a hole diameter larger than the outer diameter of the electromagnetic iron removal rod, and a cylindrical sealing cover for covering the iron removal rod passing hole from the top is arranged at the upper end of each of the iron removal rod passing holes, and a sealing hole for the electromagnetic iron removal rod to pass through is arranged on the top of the cylindrical sealing cover, and a sealing member for sealing the outer circle of the electromagnetic iron removal rod is arranged on the sealing hole, and each of the iron removal rods located on the dust removal filter element mounting plate An extension sleeve located at the periphery of the electromagnetic iron removal rod is arranged downward from the lower end of the rod passing hole, and a valve head is arranged at the lower end of the electromagnetic iron removal rod; interconnected tubes are arranged between adjacent cylindrical sealing covers that are closest to each other, and each cylindrical sealing cover is connected to an external vacuum cleaner for collecting iron particles through the interconnected tube and the iron removal hose connected to the interconnected tube; when the electromagnetic iron removal rod moves up to the point where its valve head contacts the lower end opening of the extension sleeve, the lower end opening of the extension sleeve is sealed, thereby forming a negative pressure suction iron particle suction and iron removal sealed space inside the cylindrical sealing cover; An airflow suppression component is also provided for suppressing the upward airflow inside the lower chamber of the feed bin when the powder materials are mixed to prevent the separation of powder materials of different weights. The airflow suppression component includes moving the dust filter element mounting plate in the up and down directions and setting it in the internal position of the feed bin, and setting a second linear actuator on the top cover to connect the dust filter element mounting plate to realize the movement of the dust filter element mounting plate in the up and down directions.

2. The on-line iron removal air flow mixer for lithium ion battery powder according to claim 1, wherein, The dust removal filter element is vertically arranged downward on the lower end surface of the dust removal filter element mounting plate; the extension sleeve is an iron removal filter element for forming an iron removal negative pressure air flow in the iron particle suction and iron removal sealed space, and the length dimension of the iron removal filter element in the up and down direction is shorter than the length dimension of the dust removal filter element in the up and down direction.

3. The on-line iron removal air flow mixer for lithium ion battery powder according to claim 1, wherein The several dust removal filter elements and the several electromagnetic iron removal rods are arranged alternately on the dust removal filter element mounting plate.

4. The on-line iron removal air flow mixer for lithium ion battery powder according to claim 1, characterized in that, The dust removal filter element includes a straight cylinder filter element and a conical plug connected to the lower end orifice of the straight cylinder filter element with the large head facing up. An internal air chamber is arranged inside the conical plug. Anti-blowing inhibition holes communicating with the internal air chamber are densely arranged on the outer conical surface of the conical plug. The internal air chamber of the conical plug is connected to a compressed air source through an anti-blowing inhibition enhancement pipeline.

5. An on-line iron removal air flow mixer for lithium ion battery powder according to claim 1, characterized in that, The blowing assembly is an enhanced bidirectional blowing assembly for strengthening the mixing effect of powder materials. The enhanced bidirectional blowing assembly includes a transverse blowing assembly arranged on the peripheral walls of the feeding bin for blowing a transverse air flow into the air flow mixing bin, and a vertical blowing assembly arranged at the bottom position of the air flow mixing bin for blowing an upward air flow into the air flow mixing bin; the transverse blowing assembly includes a first annular air ring arranged outside the feeding bin and connected to a compressed air source, several blowing seat plates arranged on the bin wall of the air flow mixing bin and arranged at intervals along the circumferential direction of the bin wall of the air flow mixing bin, transverse blowing holes densely arranged on the blowing seat plates and communicating with the inside of the air flow mixing bin, and a blowing cover for covering the transverse blowing holes on the blowing seat plates. A blowing chamber is formed between the blowing seat plate and the blowing cover, and the blowing chamber is connected to the first annular air ring through a blowing pipeline; a pulse solenoid valve is arranged on the blowing pipeline; the air flow mixing bin is a conical air flow mixing bin with the large mouth facing up, and the blowing direction of the transverse blowing holes is inclined upward along the transverse direction towards the inside of the air flow mixing bin.

6. The on-line iron removal air flow mixer for lithium ion battery powder according to claim 5, characterized in that The bottom orifice of the air flow mixing bin is connected with an inner flange. The inner hole position of the inner flange is connected downward with a discharge cone tube with the large mouth facing up. A discharge cylinder is vertically arranged upward at the central part inside the discharge cone tube. The piston rod of the discharge cylinder faces upward and is connected with an umbrella valve for discharging at its top; the vertical blowing assembly includes a second annular air ring arranged outside the air flow mixing bin and connected to a compressed air source, several vertical blowing holes vertically arranged on the inner flange and arranged at intervals along the circumferential direction of the inner flange, vertical blowing pipes butt-connected to the lower ends of the vertical blowing holes and connected to the second annular air ring, and fluidization cylinders vertically arranged at the lower ends of the vertical blowing pipes. The piston rod of the fluidization cylinder faces upward and enters the vertical blowing pipe. A valve plug for opening or closing the vertical blowing holes is arranged at the top end of the piston rod of the fluidization cylinder.

7. A powder online iron removal and gas flow mixing method for the lithium-ion battery powder online iron removal gas flow mixer according to any one of claims 1 to 6, characterized in that, Including the following steps: (1) Preparation: The control system drives the first linear actuator, so that the lifting plate drives the electromagnetic iron removal rod to move upward synchronously, and the electromagnetic iron removal rod is moved upward to a position above the air flow mixing bin; (2) Feeding: The powder material is added into the feed bin through the feed pipe on the lower chamber of the feed bin. When feeding, the dust removal component on the upper part of the feed bin is turned on to prevent powder overflow; after feeding is completed, the feed pipe is closed. (3) First mixing: The horizontal blowing component and the vertical blowing component on the air flow mixing bin are turned on. Under the combined action of the obliquely upward horizontal air flow of the horizontal blowing component and the vertically upward vertical air flow of the vertical blowing component, the powder material is mixed for the first time in the air flow mixing bin. (4) Second mixing and iron removal: After the first mixing is completed, the control system drives the first linear actuator, so that the lifting plate drives the electromagnetic iron removal rods to move downward synchronously. Each of the electromagnetic iron removal rods is inserted into the powder material in the air flow mixing bin, and the power supply of the electromagnetic iron removal rods is turned on, so that a magnetic adsorption force is generated on the outer surface of the electromagnetic iron removal rods; under the combined action of the obliquely upward horizontal air flow of the horizontal blowing component and the vertically upward vertical air flow of the vertical blowing component, the powder material is mixed for the second time in the air flow mixing bin; during the second mixing, the material in the air flow mixing bin is constantly in contact with the electromagnetic iron removal rods while mixing, and the iron particles in the powder are adsorbed on the electromagnetic iron removal rods, realizing on-line iron removal by air flow mixing of the powder material. (5) Discharging: After the second mixing and iron removal are completed, the horizontal blowing component and the vertical blowing component are closed, and the discharging cylinder is turned on, so that the umbrella valve moves upward to open, and the mixed powder material enters the discharge cone pipe. The clamp type pneumatic butterfly valve on the discharge straight pipe at the lower end of the discharge cone pipe is opened to realize the discharging of the powder material. (6) On-line automatic recovery of iron particles: After discharging is completed, the control system drives the first linear actuator, so that the lifting plate drives the electromagnetic iron removal rods to move upward synchronously until the valve head at the lower end of the electromagnetic iron removal rod contacts the lower orifice of the extension sleeve, thereby forming a negative pressure suction iron particle suction and iron removal sealed space inside the cylindrical sealing cover, the iron removal rod through hole and the extension sleeve, and making the iron particles adsorbed on the electromagnetic iron removal rods be surrounded in the iron particle suction and iron removal sealed space composed of the cylindrical sealing cover, the iron removal rod through hole and the extension sleeve; the external vacuum cleaner connected to the interconnection pipe of the cylindrical sealing cover is turned on, and the power supply of the electromagnetic iron removal rods is turned off. The electromagnetic iron removal rods lose the magnetic adsorption force, resulting in the iron particles adsorbed on the electromagnetic iron removal rods being sucked away by negative pressure and entering the external vacuum cleaner to be collected.

8. The powder online iron removal air flow mixing method of a lithium ion battery powder online iron removal air flow mixer according to claim 7, characterized in that, In at least one of the mixing steps of the first mixing in step (3) and the second mixing and iron removal in step (4), the second linear actuator is also activated to lower the dust removal filter element mounting plate of the dust removal component, so that the space of the lower chamber of the feed bin located below the dust removal filter element mounting plate is compressed and becomes smaller; under the combined action of the obliquely upward horizontal air flow of the horizontal air blowing assembly and the vertically upward vertical air flow of the vertical air blowing assembly, and with the synergistic effect of the downward movement of the dust removal filter element mounting plate, the powder material is compressed in a smaller air flow mixing space to achieve boiling fluidization, enabling the materials to be fully mixed; in at least one of the mixing steps of the first mixing in step (3) and the second mixing and iron removal in step (4), the filter element back blowing device is also correspondingly activated, so that when the powder materials are mixed, a part of the back blowing air flow diffuses laterally from the filter holes on the outer cylinder surface of the straight cylinder filter element to form a stable air pressure in the upper space of the lower chamber of the feed bin, and another part of the back blowing air flow diffuses obliquely downward from the back blowing suppression holes on the conical surface of the conical plug to form a downward pressing air flow that inhibits the upward movement of the air flow, thereby restricting the mixing space of the powder materials to a smaller space below the back blowing air flow for full mixing, playing a role in further preventing the light powder from moving upward and separating from the heavy powder.

Images