CN113694803A - Powder material flowing system of lithium ion battery diaphragm - Google Patents
Powder material flowing system of lithium ion battery diaphragm Download PDFInfo
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- CN113694803A CN113694803A CN202110973591.0A CN202110973591A CN113694803A CN 113694803 A CN113694803 A CN 113694803A CN 202110973591 A CN202110973591 A CN 202110973591A CN 113694803 A CN113694803 A CN 113694803A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a powder material flow system of a lithium ion battery diaphragm, which comprises a packet feeding station, two material-gas separators and a vacuum pump, wherein an air blower is arranged below the packet feeding station, the top of each material-gas separator is provided with a vacuumizing port, the side surface of each material-gas separator is provided with a feeding port, the bottom of each material-gas separator is provided with a discharging port, a stirring device is arranged on the wall surface of the packet feeding station, the feeding port of one material-gas separator is connected with the discharging port of the packet feeding station through a pipeline, the feeding port of the other material-gas separator is connected with an additive storage tank through a pipeline, the vacuumizing ports of the two material-gas separators are respectively connected with the vacuum pump through pipelines, a buffer hopper is respectively arranged below each material-gas separator, an outlet of each buffer hopper is respectively provided with a double-screw conveyer, the lower part of each buffer hopper is provided with a proportioning scale, two proportioning screws meshed in the same direction are arranged in the double-screw conveyer, the outlets of the two double-screw conveyers are respectively led into the proportioning scales, a stirring bin, a metal separator and a feeding weightless scale are sequentially arranged below the batching scale from top to bottom.
Description
Technical Field
The invention relates to a powder material flowing system of a lithium ion battery diaphragm, and belongs to the technical field of production and manufacturing of lithium ion battery diaphragms.
Background
Along with the adjustment and optimization of a global energy supply structure, the transformation and upgrading of the industry in China vigorously develops green clean energy, builds the trend of a clean low-carbon safe and efficient energy system, and has the great tendency that lithium battery energy, photovoltaic energy and the like cleanly replace the traditional coal and petroleum energy. As the first lithium battery energy field, the lithium battery can be a corner fighting field for deer competition in all countries, and policy, talent storage and process technology in all countries can be the determining factors in the ancient China.
The lithium ion battery mainly comprises four components, namely a positive electrode, a negative electrode, electrolyte and a diaphragm, wherein the diaphragm of the lithium ion battery is used as an important component of the lithium ion battery, plays a role in isolating positive and negative electrode materials in the lithium ion battery and provides a three-dimensional hole channel for the exchange and circulation of lithium ions between the positive electrode and the negative electrode. The present powder material flow system design of diaphragm manufacturing, general meeting throw the packet station with PE powder material package input when the defeated material, adopt great powerful roots blower from throwing packet station discharge gate with the PE powder through the tubular metal resonator malleation carry get into storage tank temporary storage, wait to weigh after the material system output feed supplement signal, inhale the material gas knockout drum with the powder through the negative pressure by the rotary vane vacuum pump again, get into and weigh the material system. In the process, the PE powder with the grain size of hundreds of microns is extruded and tamped by external force in the conveying process due to multiple air pressure conveying and the gravity falling and tamping of the powder with larger vertical drop, so that the continuous and stable flow is influenced by the compaction, blockage, adhesive adhesion arch and the like of the PE powder; meanwhile, the PE powder is not uniformly distributed on the stacking density due to the material conveying mode, a high-precision weightless weighing scale is adopted in a weighing system of the PE powder in the production and manufacturing of the diaphragm, the stacking density of raw materials is required to be uniformly distributed in the weightless weighing process, and the problem caused in the material conveying process can cause weighing misalignment, so that the accuracy of the weighing system is directly influenced, and further the fluctuation of the whole manufacturing process is caused.
Secondly, the prior PE powder material conveying stage has no premixing function. As is well known, the requirement of molecular weight distribution of high molecular weight polymers on the process control of polymerization reaction is very high, especially for ultra-high molecular weight PE, the distribution width of molecular weight is concentrated, which is an urgent problem in the industry, so that the molecular weight distribution of PE powder has different degrees no matter between different production batches or within the same production batch, and the molecular weight of high molecular weight polymers plays a decisive role in the processing properties and physical properties such as flow viscosity, mechanical strength, melt index, etc. of the PE powder, if the molecular weight distribution of PE powder is not uniform, the subsequent processes such as melt extrusion, stretch forming, etc. will have continuous variation fluctuation, and further the product has poor uniformity of physicochemical properties in the transverse and longitudinal directions.
In addition, the diaphragm product is usually for strengthening its mechanical strength, reduce its processing degree of difficulty or improve the materialization performance of raw materials, can add a small amount of additive in the raw materials, add the inflow weighing system according to certain additive proportion and PE powder misce bene, current PE powder batching in-process, after lower-end weighing system sent the feed supplement signal, this signal was uploaded to the batching balance step by step, the control motor PLC of batching screw rod is fed back to the batching balance again, rotate by the batching screw rod and send the PE powder into the batching balance, the batching balance constantly weighs and the start-stop of feedback control batching screw rod, realize weighing the batching. In the prior art, a single batching screw is generally adopted for feeding, and as the particle diameters of PE powder and an additive are smaller and the friction force between particles is larger, the powder has strong adhesion and poor fluidity and is easy to adhere to the surface of the batching screw, so that the screw cannot be supplemented during idling or supplemented discontinuously; meanwhile, the strong adhesion force is that part of PE powder is attached to the feeding port and cannot be fed into the batching scale, and the PE powder falls into the batching scale irregularly after being gradually accumulated, so that irregular batching and weighing errors are caused.
Finally, the existing process can enter a stirring bin to stir and mix PE powder and additives after the materials are mixed, at present, a screw type stirrer is generally used, the stirrer has a good mixing effect on the materials with similar proportion, but the mixing capacity of the materials in the diaphragm raw material is poor due to the fact that the ratio of the materials is only about 10%, and the raw materials are not mixed uniformly, so that the subsequent processing working condition difference and the product physical and chemical performance difference can be caused, and the influence is huge.
Disclosure of Invention
The invention aims to provide a powder material flowing system for a lithium ion battery diaphragm capable of stabilizing continuous flowing materials, which is used for solving the technical problems that the powder material flowing system in the prior art is easy to be compacted and blocked and cannot realize premixing.
The invention adopts the following technical scheme: a powder material flow system of a lithium ion battery diaphragm comprises a packet feeding station, two material-gas separators and a vacuum pump, wherein an electric hoist is arranged above the packet feeding station, an air blower is connected below the packet feeding station through a pipeline, a vacuumizing port is arranged at the top of each material-gas separator, a feeding port is arranged at the upper part of the side surface of each material-gas separator, a discharging port is arranged at the bottom of each material-gas separator, a stirring device is arranged on the wall surface of the packet feeding station, the feeding ports of the two material-gas separators are connected with a discharging port of the packet feeding station through pipelines, the feeding port of the other material-gas separator is connected with an additive storage tank through a pipeline, the vacuumizing ports of the two material-gas separators are respectively connected with the vacuum pump through pipelines, a buffer hopper is respectively arranged below each material-gas separator, a batching scale is arranged at the lower part of the buffer hopper, and the discharging ports of the two material-gas separators are respectively connected with inlets of the two buffer hoppers, the double-screw conveyor is arranged at an outlet of each buffer hopper, two blending screws meshed in the same direction are arranged in the double-screw conveyor, outlets of the two double-screw conveyors are communicated into the blending scale, a stirring bin, a metal separator and a feeding weightlessness scale are sequentially arranged below the blending scale from top to bottom, a stirrer is arranged in the stirring bin, an inlet connected with the outlet of the blending scale is arranged at the upper part of the stirring bin, an outlet connected with the metal separator is arranged at the lower part of the stirring bin, the metal separator comprises a separation bin, a metal detector arranged in the separation bin and a waste outlet positioned on the side surface of the separation bin, a blanking channel communicated into the feeding weightlessness scale is arranged at the bottom of the separation bin, the feeding weightlessness scale comprises a hopper and a weighing scale, a feeding stirrer is arranged in the outlet at the bottom of the hopper, a feeding screw is arranged below the outlet at the bottom of the hopper, a vacuumizing port of the material separator, Valves are arranged at a feed opening of the material-gas separator, an outlet of the double-screw conveyer, an outlet of the batching scale and an outlet of the stirring bin, when the batching scale reaches a preset weight and batching ratio, the double-screw conveyer stops acting, and the valve at the outlet of the double-screw conveyer is closed.
And a breathing and back-blowing system is arranged on the hopper of the feeding weightlessness scale.
The feeding screw is a double-screw feeder.
The valve is a pneumatic butterfly valve.
The batching screw of the double-screw conveyor is obliquely arranged, and the outlet position of the double-screw conveyor is higher than the inlet position.
The stirring device is a spiral ribbon stirrer, a rotating shaft of the spiral ribbon stirrer is fixed on the wall surface of the bag throwing station, and the rotating shaft of the spiral ribbon stirrer is parallel to the horizontal plane.
The stirrer in the stirring bin is a coulter type stirrer.
The pipeline between the air blower and the bag feeding station and the pipeline between the bag feeding station and the material-gas separator are metal conveying pipelines, and the pipeline between the vacuumizing port of the material-gas separator and the vacuum pump is a steel wire hose.
The vacuum pump is a rotary vane vacuum pump.
The blower is a roots blower.
The invention has the beneficial effects that: (1) in the material conveying process, PE powder is put in from a bag feeding station, the PE powder is blown into a material conveying metal pipeline from a material outlet by an air blower, meanwhile, a vacuum pump is started to run through a material-gas separator, vacuum negative pressure is generated in a hopper and the pipeline to suck and pull the PE powder, the PE powder enters the hopper along the metal pipeline under the action force of pushing and pulling, the front and back driving force and the traction force can enable the PE powder to be conveyed more smoothly in the metal pipeline, the pipeline is prevented from being blocked, the load of material conveying equipment is reduced, the equipment is prevented from being blocked and damaged, and the like. And because PE powder receives the downward thrust of malleation and ascending negative pressure suction simultaneously behind the input hopper, so the powder can form the vortex in the hopper, avoids falling down under single malleation thrust to pound and press the rammer, causes to press and blocks up material and bulk density layering. Therefore, the problem that in the prior art, when PE powder is conveyed, external force extrusion and tamping are generated in the conveying process of the PE powder due to positive pressure air conveying and gravity falling and smashing of the powder, so that powder compaction, material blockage, adhesive arch and the like influence continuous and stable flow is solved.
(2) According to the invention, the stirring device is arranged in the bag feeding station to premix the PE powder, and when PE powder of different or same production batches is fed into the bag feeding station, the spiral-belt type stirrer is started to stir and mix the PE powder, so that the PE powder entering the flow material weighing system has better uniformity in material property, and simultaneously, the caking in the powder can be crushed, and the blockage is avoided, thereby solving the problem of material property difference caused by molecular weight distribution in polymerization production of the PE powder in the prior art.
(3) The invention uses the homodromous double screws for conveying materials, the forced conveying function of the homodromous double screws has better conveying effect on powder with small particle size and poor liquidity than that of a single screw, and simultaneously the mutually meshed homodromous double screws also have self-cleaning function during operation, the self-cleaning performance can continuously clean PE powder adhered to the surfaces of the screws and the batching pipelines, thereby avoiding the wall hanging and blockage of the PE powder with strong adhesion and poor liquidity and ensuring the stability and the uniformity of the batching flow. Solves the problem that in the prior art, the batching screw is mostly a single screw, which causes the powder with strong adhesion to adhere to the surface of the feeding screw and influences the continuous and stable flow,
(4) the invention adds a valve at the outlet at the tail end of the double-screw conveyer, feeds back a batching termination signal to the batching screw when the batching scale detects that the preset batching specific gravity is reached, the batching screw stops feeding immediately, and the valve closes immediately at the same time, so that the batching screw and the valve open and close simultaneously, thereby avoiding the influence on the batching specific gravity and the batching quality caused by the material accumulation and hanging at the batching port, and reducing the batching weighing error. The problem of PE powder adhesion attach to the batching mouth and cause batching weighing error among the prior art is solved.
(5) According to the invention, the coulter type stirrer is used in the stirring bin below the batching scale, the stirring range of the coulter type stirrer is larger, and the mixing effect on powder with poor fluidity and large batching specific weight is better. Solves the problem that the screw type stirrer used in the prior art has poor mixing effect on powder materials with large proportion difference.
Drawings
Fig. 1 is a system flow diagram of a powder material flow system of a lithium ion battery separator according to an embodiment of the invention.
In the figure: 1-electric hoist, 2-material bag, 3-package station, 4-stirring device, 5-blower, 6-metal conveying pipeline, 7-material gas separator, 8-buffer hopper, 9-double screw conveyor, 10-batching scale, 11-stirring bin, 1101-coulter type stirrer, 12-metal separator, 1201-metal detector, 1202-waste outlet, 13-feeding weightlessness scale, 1301-hopper, 1302-breathing and back-blowing system, 1303-weighing scale, 1304-feeding stirrer, 1305-feeding screw, 14-steel wire hose and 15-vacuum pump.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1, the powder material flowing system of the lithium ion battery separator according to the embodiment of the present invention includes a packet feeding station 3, a material-gas separator 7, and a vacuum pump 15, where the vacuum pump 15 is a rotary vane vacuum pump. Throw the top of packet station 3 and be equipped with electric block 1, electric block 1 is used for throwing packet station 3 tops with package 2 transport, throws packet station 3 below and has a blower 5 through the pipe connection, blower 5 is the roots blower.
And a stirring device 4 is arranged on the wall surface of the bag throwing station 2, the stirring device 4 is a spiral-ribbon stirrer, a rotating shaft of the spiral-ribbon stirrer is fixed on the wall surface of the bag throwing station 2, and the rotating shaft of the spiral-ribbon stirrer is parallel to the horizontal plane.
The top of the material-gas separator 7 is provided with a vacuumizing port, the upper part of the side surface is provided with a feeding hole, the bottom of the side surface is provided with a discharging hole, the number of the material-gas separators 7 is two, the feeding hole of one material-gas separator 7 is connected with the discharging hole of the bag feeding station through a pipeline and used for conveying material powder, the feeding hole of the other material-gas separator 7 is connected with an additive storage tank through a pipeline and used for conveying additives, and the vacuumizing ports of the two material-gas separators 7 are respectively connected with a vacuum pump 15 through pipelines. The pipeline between the air blower 5 and the package feeding station 2 and the pipeline between the package feeding station 2 and the material-gas separator 7 are metal conveying pipelines 6, and the pipeline between a vacuumizing port of the material-gas separator 7 and the vacuum pump 15 is a steel wire hose 14.
The lower part of each material-gas separator 7 is respectively provided with a buffer hopper 8, the lower part of each buffer hopper 8 is provided with a batching scale 10, the feed openings of the two material-gas separators 7 are respectively connected with the inlets of the two buffer hoppers 8, the outlet of each buffer hopper 8 is respectively provided with a double-screw conveyor 9, two batching screws meshed in the same direction are arranged in the double-screw conveyor, the batching screws of the double-screw conveyor 9 are obliquely arranged, and the outlet position of the double-screw conveyor 9 is higher than the inlet position. The outlets of both twin-screw conveyors 9 open into a batching scale 10.
A stirring bin 11, a metal separator 12 and a feeding weightlessness scale 13 are sequentially arranged below the batching scale 10 from top to bottom, a stirrer is arranged in the stirring bin 11, the upper part of the stirring bin 11 is provided with an inlet connected with an outlet of the batching scale 10, the lower part of the stirring bin 11 is provided with an outlet connected with the metal separator 12, and the stirrer in the stirring bin is a coulter type stirrer 1101.
The metal separator 12 comprises a separation bin, a metal detector 1201 arranged in the separation bin, and a waste outlet 1202 arranged on the side surface of the separation bin, wherein a blanking channel leading into the feeding weightlessness scale 13 is arranged at the bottom of the separation bin.
The feeding weightlessness scale 13 comprises a hopper 1301 and a weighing scale 1302, wherein a feeding stirrer 1304 is arranged in an outlet at the bottom of the hopper 1301, and a feeding screw 1305 is arranged below an outlet at the bottom of the hopper 1301. A breathing and back-blowing system 1302 is arranged on the hopper 1301 of the feeding weightlessness scale 13, and the feeding screw 1305 is a double-screw feeder.
Valves are arranged at the vacuumizing port of the material-gas separator 7, the feed port of the material-gas separator 7, the outlet of the double-screw conveyer 9, the outlet of the batching scale 10 and the outlet of the stirring bin 11, when the batching scale 10 reaches a preset weight and batching ratio, the double-screw conveyer 9 stops acting, and the valve at the outlet of the double-screw conveyer 9 is closed. The valves are all pneumatic butterfly valves.
As shown in fig. 1, a PE powder feeding station is arranged below the electric hoist, the electric hoist is used for taking a material bag, a helical ribbon stirrer in the feeding station is fixed on the bin wall of the feeding station through a bearing, a reduction box and a variable frequency driving motor are connected to the outside of the feeding station, when the material bag with material difference is fed into the feeding station, the helical ribbon stirrer is started to premix the powder, the continuous consistency of the powder is enhanced, meanwhile, the helical ribbon stirrer can continuously stir the powder to prevent the powder from caking, the helical ribbon stirrer can also continuously stir the material into a discharge port, and the stirring frequency of the helical ribbon stirrer can be adjusted according to the feeding amount or the process requirement as the air blower blows into a conveying metal pipeline; the feeding device comprises a feeding station, a feeding port, a rotary vane type vacuum pump, a front-end Roots blower, a rear-end vacuum pump, a PE powder material, a hopper and a discharging pipe, wherein the feeding port is arranged at the bottom of the feeding station, one end of the feeding port is connected with an air outlet of a blower through a flange, the other end of the feeding port is connected to a material-gas separator through a metal conveying pipeline, a steel wire hose is fastened at the top of the material-gas separator through a clamp, the tail end of the steel wire hose is connected with the rotary vane type vacuum pump, when the PE powder material is conveyed, the PE powder material is blown by the front-end Roots blower, the rear-end vacuum pump sucks the PE powder material, and the PE powder material enters the hopper along the metal pipeline for temporary storage under two acting forces of dragging before pushing and pulling; a pneumatic butterfly valve is arranged at a vacuumizing port of the material-gas separator and can control the PE powder and additive to be supplemented, when the left butterfly valve is opened and the right butterfly valve is closed in the figure 1, the PE powder is sent into a buffer hopper on the left side by an air blower and a vacuum pump, and when the right butterfly valve is opened and the left butterfly valve is closed, the additive is pumped into a buffer hopper on the right side by the vacuum pump (the content of the additive accounts for only 10 percent, so that the PE powder-gas separator is only suitable for vacuum negative pressure conveying); a feed opening at the bottom of the material-gas separator is communicated with the buffer hopper, a pneumatic butterfly valve is arranged in the middle of the material-gas separator, the pneumatic butterfly valve is opened after the material supplementing action of the material-gas separator is finished, and powder flows into the buffer hopper for temporary storage; the feed opening at the bottom of the hopper is communicated with a batching pipeline, a double-screw conveyor is arranged in the hopper, two batching screws meshed in the same direction are arranged in the double-screw conveyor, the tail part of the double-screw conveyor is connected with a variable-frequency drive motor, the two batching screws have certain upward inclination angles, the powder is prevented from falling due to the gravity of non-screw-driven conveying, when the two screws are meshed and rotate, PE powder with poor fluidity can be forcibly conveyed along threads, and meanwhile, the two mutually meshed double screws can mutually clear the powder adhered to the surfaces of each other when in operation, so that the self-cleaning capability is good, and the stability and uniformity of batching flow are ensured; the tail end of the double-screw conveyer is provided with a pneumatic butterfly valve which is communicated to the batching scale through a pipeline, in the batching process, the batching scale continuously weighs and feeds back the weight of powder in the batching scale, when the preset batching mass and specific gravity are reached, a batching termination signal is immediately fed back to the double-screw conveyer, the conveying action of the double-screw conveyer is immediately stopped, and meanwhile, the pneumatic butterfly valve is immediately closed, so that the double-screw conveyer and the pneumatic butterfly valve are simultaneously started and closed, the influence on the specific gravity and the quality of batching due to the material accumulation and hanging at a batching port is avoided, and the batching weighing error is reduced; the pneumatic butterfly valve is arranged at a discharge port at the bottom of the batching scale, the pneumatic butterfly valve is communicated with the stirring bin through a pipeline, the stirring bin is internally provided with a coulter type stirrer, the coulter type stirrer is fastened on the wall of the stirring bin through a bearing, a reduction box and a driving motor are externally connected, the stirring amplitude of the coulter type stirrer is larger, the mixing effect on powder with poor fluidity and large batching specific weight difference is better, and the stirring speed can be adjusted according to the mixing effect and the process requirement; a discharge port at the bottom of the stirring bin is communicated with an inlet of a metal separator through a pipeline, a pneumatic butterfly valve is arranged in the middle of the stirring bin, if the metal separator detects that the powder contains metal impurities, the powder of the batch is discharged from a waste outlet on the side surface, and the metal separator is used for detecting and removing the metal impurities in the material, so that equipment damage and product pollution are avoided; the outlet at the bottom of the metal separator is communicated with the inlet of the feeding weightlessness scale through a pipeline, a pneumatic butterfly valve is arranged in the middle of the metal separator, the feeding weightlessness scale has the function of controlling the rotating speed of a feeding screw rod to adjust the powder flow through continuous weighing calculation, and stably and continuously supplying raw materials to a melting extruder in the next process, and the metal separator mainly comprises a hopper, a breathing and back-blowing system, a weighing scale, a stirrer and a feeding screw rod. The valve provided by the invention has the functions of isolating superior and inferior equipment except for special instructions, preventing mutual influence and realizing batch flow.
The use process comprises the following steps: an operator uses the electric hoist 1 to adjust a material bag to the upper part of the bag feeding station 2, unloads a material bag opening, puts powder into the bag feeding station 2, starts a ribbon stirrer to premix, and starts a ribbon stirrer to feed back and transmit a material supplementing signal step by a material flow system, a butterfly valve at the top of a material and gas feeder 7 positioned on the left side is opened, a butterfly valve at the top of a material and gas separator 7 on the right side is closed, an air blower 5 and a vacuum pump 15 are simultaneously opened, PE powder is fed into the material and gas separator 7 along a metal conveying pipe 6, the butterfly valve at the bottom of the material and gas separator 7 is opened, the PE powder flows into a buffer hopper 8, and similarly, the additive is sucked by the vacuum pump through a steel wire hose 14 to flow into the buffer hopper 8 on the right side; after the dosing signals are transmitted and received step by step, the left double-screw conveyor 9 rotates, meanwhile, a bottom butterfly valve is opened, PE powder is conveyed into the dosing scale 10, the dosing scale 10 continuously weighs and feeds back, after the preset PE powder proportion and weight are achieved, the PE powder is fed back to the double-screw conveyor 9 to stop a driving motor, meanwhile, the butterfly valve at the tail end of the double-screw conveyor 9 is closed, and similarly, the additives are also fed through the closed-loop feedback of the right double-screw conveyor 9 and the dosing scale 10; after the batching is finished, a butterfly valve at the bottom of the batching scale 10 is opened, the mixed material flows into the stirring bin 11, and a coulter type stirrer 1101 in the stirring bin 11 drives a motor to rotate to stir and mix the mixed material, so that the uniformity of the material property of the mixed material is enhanced; after complete stirring and mixing, a butterfly valve at the bottom of the stirring bin 11 is opened, the mixed material flows into the metal separator 12, if metal foreign matters are contained, the mixed material is discharged out of the system through a waste material outlet 1202, if the mixed material is qualified through detection, the butterfly valve at the bottom is opened, the mixed material flows into the feeding weightlessness scale 13, the feeding weightlessness scale 13 controls the rotating speed of the feeding screw 1305 to adjust the powder flow through continuous weighing calculation, and stable and continuous raw material supply is carried out on the melting extruder.
1. In the prior art, the problems that the PE powder is extruded and tamped by external force in the conveying process due to positive pressure air conveying and the gravity falling and tamping of the powder in the powder conveying process, so that the powder is compacted and blocked, and the viscous adhesion arch and the like influence continuous and stable material flowing exist; in the material conveying process, PE powder is put in from a bag feeding station, the PE powder is blown into a material conveying metal pipeline from a discharge port by a Roots blower, meanwhile, a rotary-vane vacuum pump at the other end is started to run through a steel wire hose and a material gas separator, vacuum negative pressure is generated in a hopper and the material conveying metal pipeline to suck and draw the PE powder, the PE powder enters the hopper along the metal pipeline under the action force of pushing and pulling, the front and back driving force and the traction force can enable the PE powder to be conveyed more smoothly in the metal pipeline, pipeline blockage is avoided, the load of material conveying equipment is reduced, the equipment is prevented from being held back and damaged, and the like. And because PE powder receives the downward thrust of malleation and ascending negative pressure suction simultaneously behind the input hopper, so the powder can form the vortex in the hopper, avoids falling down under single malleation thrust to pound and press the rammer, causes to press and blocks up material and bulk density layering.
2. In the prior art, the PE powder is premixed by adding a helical ribbon stirrer at a bag feeding station due to material property difference caused by molecular weight distribution difference in polymerization production. After PE powder of different or same production batches is thrown into and is thrown a packet station, start the spiral shell belt agitator and stir the PE powder and mix, can make the PE powder that gets into the material weighing system better in the homogeneity of material nature, also can stir the caking in the powder and smash simultaneously, avoid the putty.
3. In the prior art, powder proportioning screws are mostly single screws, so that powder with strong adhesion is adhered to the surface of a feeding screw, and the problem of continuous and stable material flow is influenced.
4. In the conventional powder batching, powder is adhered to a batching port and randomly falls to cause batching weighing errors, a pneumatic butterfly valve is additionally arranged at the batching port at the tail end of a batching screw rod, the batching screw rod has a certain upward inclination angle to prevent the powder from falling due to gravity of non-screw-driven conveying, after a batching scale detects that the preset batching proportion is reached, a batching termination signal is fed back to the batching screw rod, the material conveying action of the batching screw rod is stopped immediately, meanwhile, the pneumatic butterfly valve is closed immediately, so that the batching screw rod and the pneumatic butterfly valve are opened and closed simultaneously, the influence of the material accumulation and hanging at the batching port on the proportion and the quality of the batching is avoided, and the batching weighing errors are reduced.
5. In the existing powder stirring and mixing process, the used screw type stirrer has poor mixing effect on the powder with large proportion difference, the plough coulter type stirrer is used, the stirring amplitude of the plough coulter type stirrer is larger, and the mixing effect on the powder with poor fluidity and large proportion difference is better.
The PE powder stable continuous flow material is used as stable continuous flow material of high polymer PE powder as a diaphragm raw material, and is used for stable material supply for subsequent high-temperature melt extrusion of high polymer, and the accurate weighing and continuous flow stability of the PE powder are the basis of the diaphragm product process stability. The powder material flowing system aims at the difference of bulk density and compaction caused by air flow conveying and smashing under gravity in the production process of PE powder material in the prior art; the problems of uneven mixing of raw materials, weighing errors and the like are solved, transformation and innovation are carried out, and the accuracy and the stability of the flow are greatly improved.
Although the embodiments of the present invention have been described above in detail, the present invention is not limited to the above-described embodiments. The scope of the invention defined by the appended claims encompasses all equivalent substitutions and modifications.
Claims (10)
1. The utility model provides a powder material flow system of lithium ion battery diaphragm, its includes throws a packet station, material gas separator and vacuum pump, and the top of throwing the packet station is equipped with electric block, and the below of throwing the packet station has the air-blower through the pipe connection, and the top of material gas separator is equipped with the upper portion of evacuation mouth, side and is equipped with the feed inlet, the bottom is equipped with feed opening, its characterized in that: the wall surface of the package feeding station is provided with two stirring devices, the feed inlet of one material-gas separator is connected with the discharge outlet of the package feeding station through a pipeline, the feed inlet of the other material-gas separator is connected with an additive storage tank through a pipeline, the vacuumizing ports of the two material-gas separators are respectively connected with a vacuum pump through pipelines, a buffer hopper is respectively arranged below each material-gas separator, the lower part of the buffer hopper is provided with a batching scale, the feed outlets of the two material-gas separators are respectively connected with the inlets of the two buffer hoppers, the outlet of each buffer hopper is respectively provided with a double-screw conveyer, two batching screws meshed in the same direction are arranged in the double-screw conveyer, the outlets of the two double-screw conveyers are respectively introduced into the batching scale, a stirring bin, a metal separator and a feed weightlessness scale are sequentially arranged below the batching scale from top to bottom, and a stirrer is arranged in the stirring bin, the upper part of the stirring bin is provided with an inlet connected with an outlet of the batching scale, the lower part of the stirring bin is provided with an outlet connected with a metal separator, the metal separator comprises a separation bin, a metal detector arranged in the separation bin and a waste outlet positioned on the side surface of the separation bin, the bottom of the separation bin is provided with a discharging channel communicated into the feeding weightlessness scale, the feeding weightlessness scale comprises a hopper and a weighing scale, a feeding stirrer is arranged in the outlet at the bottom of the hopper, a feeding screw rod is arranged below the outlet at the bottom of the hopper, a vacuumizing opening of the feeding and separating device, a discharging opening of the double-screw conveyer, the outlet of the batching scale and the outlet of the stirring bin are all provided with valves, when the batching scale reaches a preset weight and batching ratio, the double-screw conveyer stops acting, and the valve at the outlet of the double-screw conveyer is closed.
2. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: and a breathing and back-blowing system is arranged on the hopper of the feeding weightlessness scale.
3. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: the feeding screw is a double-screw feeder.
4. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: the valve is a pneumatic butterfly valve.
5. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: the batching screw of the double-screw conveyor is obliquely arranged, and the outlet position of the double-screw conveyor is higher than the inlet position.
6. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: the stirring device is a spiral ribbon stirrer, a rotating shaft of the spiral ribbon stirrer is fixed on the wall surface of the bag throwing station, and the rotating shaft of the spiral ribbon stirrer is parallel to the horizontal plane.
7. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: the stirrer in the stirring bin is a coulter type stirrer.
8. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: the pipeline between the air blower and the bag feeding station and the pipeline between the bag feeding station and the material-gas separator are metal conveying pipelines, and the pipeline between the vacuumizing port of the material-gas separator and the vacuum pump is a steel wire hose.
9. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: the vacuum pump is a rotary vane vacuum pump.
10. The powder flow system of the lithium ion battery separator according to claim 1, characterized in that: the blower is a roots blower.
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| CN202110973591.0A CN113694803B (en) | 2021-08-24 | 2021-08-24 | Powder material flowing system of lithium ion battery diaphragm |
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| CN113694803B (en) | 2023-08-15 |
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