Electrospinning structure with multiple nozzles

Abstract

The present invention provides an electrostatic spinning structure with multiple nozzles, comprising: a frame; a unwinding assembly, a spinning machine assembly and a winding assembly which are arranged on the frame and in sequence according to the direction in which the substrate is conveyed; an upper and lower liquid assembly connected to the spinning machine assembly, and an electronic control assembly; the spinning machine assembly comprises: a first bearing sub-frame and a second bearing sub-frame fixed to the frame, an insulating module and a nozzle module arranged on the first bearing sub-frame, and a grounding plate arranged opposite to the nozzle module and on the second bearing sub-frame; the nozzle module comprises a plurality of nozzles arranged on the same side of the insulating module, and the plurality of nozzles are all arranged between the grounding plate and the insulating module; during the process of conveying the substrate through the grounding plate, the substrate is located between the nozzle and the grounding plate, and the substrate is conveyed in contact with the grounding plate; the electrostatic spinning structure of the present invention has high control accuracy and can meet the requirements for different product processes and quality.

Description

Technical Field

[0001] The invention relates to the field of electrostatic spinning membrane manufacturing, and in particular to an electrostatic spinning structure with multiple nozzles. Background Art

[0002] Electrospinning technology uses high-voltage electrostatic force to accelerate the ejection of solution. During the extrusion process, the solution is pulled by the electrostatic force, overcoming gravity, surface tension and other effects to be drawn into nano- or micron-sized silk threads, which eventually fly to the surface of the low-potential substrate and form a thin film. During the spinning process, when the Coulomb force on the solution is sufficient to overcome gravity and surface tension, the jet obtains an upward force to form a jet stream, which is pulled into fiber filaments by electricity.

[0003] In the prior art, the fiber ribbon is subjected to high voltage electricity, and the same polarity charges repel each other during the spraying process, so the film thickness distribution on the receiving cloth is uneven; usually, when a single nozzle is used, the material layer thickness is the projected point of the nozzle excitation onto the receiving cloth, the center is thinner, the ring thickens, the ring extends outward and gradually thins; when multiple nozzles are used, in addition to the single needle feature, the film layer is formed on the receiving cloth in the shape of a bull tongue, and the contours between the bull tongue patches are clear. This is because when the charged solution is sprayed onto the receiving cloth, the same polarity charges produce a repulsive force. This brings difficulties to the industrial-grade production of electrospinning.

[0004] In order to solve the above problems, there are currently two solutions: wire electric excitation and rotary excitation. Wire electric excitation applies the solution to the high-voltage metal wire, and rotary excitation uses a rotating dipping device to form continuous spinning. However, both wire electric excitation and rotary excitation have problems such as high machining and assembly requirements, uneven dipping, and uncontrollable spinning flow. Needle spinning has great advantages in maintaining stable spinning quality and controlling spinning flow and output. Therefore, optimizing and transforming multi-needle spinning technology and leveraging its strengths and avoiding its weaknesses are important research topics. Summary of the invention

[0005] The object of the present invention is to provide an electrospinning structure with multiple nozzles.

[0006] To achieve the above-mentioned purpose, the present invention provides an electrospinning structure with multiple nozzles, which is used to spray a solution to a substrate transmitted by the electrospinning structure through multiple nozzles arranged thereon in an electric field to perform electrospinning; the electrospinning structure with multiple nozzles specifically includes: a frame;

[0007] An unwinding assembly, a spinning unit assembly and a winding assembly are arranged on the frame and arranged in sequence according to the substrate conveying direction;

[0008] An upper and lower liquid component connected to the spinning machine assembly and providing a nozzle module in the spinning machine assembly with a solution sprayed toward a substrate;

[0009] and an electronic control component for controlling the operation of the electrospinning structure;

[0010] The spinning machine assembly comprises: a first bearing subframe, a second bearing subframe fixed on the frame, an insulating module and a nozzle module arranged on the first bearing subframe, and a grounding plate arranged opposite to the nozzle module and arranged on the second bearing subframe;

[0011] The nozzle module includes a plurality of nozzles arranged on the same side of the insulating module, the direction in which the nozzle sprays the solution is perpendicular to the conveying direction of the substrate, and the plurality of nozzles are arranged between the grounding plate and the insulating module;

[0012] When the substrate is conveyed through the grounding plate, the substrate is located between the nozzle and the grounding plate, and the substrate is conveyed while the grounding plate is in contact with the grounding plate.

[0013] As a further improvement of the present invention, the grounding plate is a corrugated plate structure, which includes: a planar substrate, and a protrusion formed on the same wall side of the planar substrate;

[0014] When the substrate is conveyed through the grounding plate, the substrate is located on the protrusion side, and the substrate is conveyed while at least adhering to the protrusion.

[0015] As a further improvement of the present invention, the insulating module comprises: a plurality of insulating plates fixedly overlapped in sequence in a direction perpendicular to the substrate conveying direction;

[0016] Among the plurality of insulating plates, at least a portion of the side wall edges of at least one group of adjacent insulating plates have a distance difference in the substrate conveying direction.

[0017] As a further improvement of the present invention, the nozzle is a first nozzle, and the first nozzle includes:

[0018] A first main body portion, wherein the first main body portion has a first main body end portion disposed toward the substrate, and an outer wall surface of the first main body end portion is in an arc shape;

[0019] A first transmission channel that runs through the first main body and is used for conveying liquid, wherein an outlet of the first transmission channel is located at an end of the first main body;

[0020] An annular first boss extending radially outward from the outer wall surface of the first main body portion along the first main body portion, wherein the first boss is disposed close to an end portion of the first main body and has a first end surface disposed toward the end portion of the first main body;

[0021] A first groove is formed by being recessed from the first end surface toward a direction away from the first end surface.

[0022] As a further improvement of the present invention, in the radial direction of the first main body, the cross section of the first groove is annular; and the opening of the first groove located at the first end surface is connected to the outer wall surface of the first boss;

[0023] In the axial direction of the first main body, from the first end surface to a direction away from the first end surface, a cross section of the first groove gradually decreases.

[0024] As a further improvement of the present invention, the nozzle is a second nozzle, and the second nozzle includes:

[0025] A second main body portion, wherein the second main body portion has a second main body end portion disposed toward the substrate, and an end surface of the second main body end portion facing the substrate is a second main body end surface;

[0026] A second groove formed by being recessed from the end surface of the second body and away from the end surface of the second body;

[0027] A second transmission channel runs through the second main body and is used for conveying liquid. The outlet of the second transmission channel is located on the bottom wall of the second groove.

[0028] As a further improvement of the present invention, in the radial direction of the second main body, the cross section of the second groove is circular; and the opening of the second groove located on the end surface of the second main body is connected to the outer wall surface of the second main body;

[0029] In the axial direction of the second main body portion, from the second main body end surface to a direction away from the second main body end surface, a cross section of the second groove gradually decreases.

[0030] As a further improvement of the present invention, the electrospinning structure further comprises: a sealing needle assembly selectively combined with the nozzle module;

[0031] The sealing needle assembly comprises: a sealing needle body, a sealing needle hole arranged corresponding to the nozzle and opened on the sealing needle body, and a sealing block arranged in the sealing needle hole;

[0032] When the sealing needle assembly is selectively combined with the nozzle module, the sealing needle body is fixed to the nozzle module by a tube clamp, each nozzle is correspondingly sleeved in the corresponding sealing needle hole, and at least the outlet of each nozzle is embedded in the corresponding sealing block.

[0033] As a further improvement of the present invention, the spinning machine assembly further comprises: a moving unit arranged below the first bearing subframe, the moving unit comprising: a lifting platform frame, a lifting assembly arranged on the lifting platform frame, a sliding assembly, and a moving wheel arranged below the lifting platform frame;

[0034] The lifting assembly is used to drive the insulation module and the nozzle module to reciprocate in the vertical direction; the sliding assembly is used to drive the insulation module and the nozzle module to reciprocate in the horizontal direction.

[0035] As a further improvement of the present invention, the upper and lower liquid components include: upper and lower liquid slides arranged on the frame, a liquid storage tank arranged in cooperation with the upper and lower liquid slides and reciprocating along the upper and lower liquid slides, a liquid adding tank, a positive pressure tank and a negative pressure tank connected to the liquid storage tank through pipelines, and a quantitative pump and a solenoid valve arranged on the pipeline;

[0036] The liquid storage tank has a liquid inlet connected to the liquid adding tank through the pipeline, a liquid outlet connected to the nozzle module through the pipeline, an air inlet connected to the positive pressure tank through the pipeline, and an air outlet connected to the negative pressure tank through the pipeline;

[0037] When the electrospinning structure is working, the liquid level in the liquid storage tank is higher than the nozzle outlet in the vertical space height.

[0038] The beneficial effects of the present invention are as follows: the present invention has an electrospinning structure with multiple nozzles, an electric control component is provided to uniformly control the electrospinning structure, thereby enhancing the overall linkage force of the electrospinning structure and saving labor costs; the control accuracy is high, and the requirements for different product processes and quality can be met; the splicing is convenient, and the system compatibility is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of the electrospinning structure with multiple nozzles provided by the present invention;

[0040] Figure 2 is a schematic structural diagram of a ground plate provided by one embodiment of the present invention;

[0041] Figure 3A , 3B They are respectively schematic cross-sectional views of ground plates provided in different embodiments of the present invention;

[0042] Figure 4 is a schematic structural diagram of an insulation module provided by one embodiment of the present invention;

[0043] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure of the portion indicated by circle A;

[0044] Figure 6 , Figure 7 They are cross-sectional schematic diagrams of nozzles provided in different embodiments of the present invention;

[0045] Figure 8 yes Figure 1 Schematic diagram of the structure of some parts at a zero-one angle;

[0046] Fig. 9 It is a schematic diagram of the exploded structure of the sealing needle assembly and the nozzle module provided by one embodiment of the present invention;

[0047] Fig.10 It is a structural schematic diagram of the cooperation between the sealing needle assembly and the nozzle module provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on the embodiments are all within the protection scope of the present invention.

[0049] Ginseng Figure 1 As shown, the electrospinning structure with multiple nozzles provided by the present invention is used to spray a solution toward a substrate conveyed by the electrospinning structure through the multiple nozzles arranged thereon in an electric field to perform electrospinning.

[0050] The electrospinning structure includes: a frame 10; an unwinding assembly 30, a spinning assembly 40 and a winding assembly 50 arranged on the frame 10 and arranged in sequence according to the conveying direction of the substrate 20; an upper and lower liquid assembly 60 connected to the spinning assembly 40 and providing a solution for the nozzle module in the spinning assembly 40 to spray onto the substrate 20; and an electronic control assembly 70 for controlling the operation of the electrospinning structure;

[0051] Preferably, in practical applications, in order to improve equipment stability and enhance product quality, the electrospinning structure with multiple nozzles is preferably placed in a closed room for operation. More preferably, a constant temperature and humidity system may be added to the closed room to adjust the ambient temperature.

[0052] The unwinding assembly 30 includes: an unwinding frame 31, an unwinding air shaft 33 arranged on the unwinding frame 31, an unwinding reel 35 arranged with the unwinding air shaft 33 as a pivot axis, an unwinding drive motor arranged on the unwinding frame 31 and used to drive the unwinding air shaft 33 to rotate; an unwinding tension testing unit 37 and a shaft roller 39 arranged on the unwinding frame 31 and sequentially arranged behind the unwinding reel 35 in the conveying direction of the substrate 20, the shaft roller 39 is used to guide the operation of the substrate 20, and the drive motor is usually formed by a servo motor with an acceleration and reduction gear.

[0053] Accordingly, the winding assembly 50 is usually symmetrically arranged with the unwinding assembly 30 on both sides of the spinning unit assembly 40. In one embodiment of the present invention, the winding assembly 50 includes: a winding frame 51, a winding air shaft arranged on the winding frame 51, a winding reel 55 arranged with the winding air shaft as a pivot axis, a winding drive motor arranged on the winding frame 51 and used to drive the winding air shaft to rotate; a winding tension test unit and an axis roller arranged on the winding frame 51 and sequentially arranged in front of the winding reel 55 in the conveying direction of the substrate 20, and the axis roller is used to guide the substrate 20 to run.

[0054] The substrate 20 is typically a woven receiving fabric.

[0055] The spinning unit assembly 40 includes: a first bearing subframe 41, a second bearing subframe 42 fixed to the frame 10, an insulating module 43 and a nozzle module 44 arranged on the first bearing subframe 41, and a grounding plate 45 arranged opposite to the nozzle module 44 and arranged on the second bearing subframe 42;

[0056] The nozzle module 44 includes a plurality of nozzles 441 disposed on the same side of the insulating module 43, wherein the direction in which the nozzles 441 spray the solution is perpendicular to the conveying direction of the substrate 20, and the plurality of nozzles 441 are disposed between the grounding plate 45 and the insulating module 43;

[0057] When the substrate 20 is conveyed through the grounding plate 45 , the substrate 20 is located between the nozzle 441 and the grounding plate 45 , and the substrate 20 is conveyed by adhering to the grounding plate 45 under the action of the electrostatic adsorption force of the grounding plate 45 .

[0058] The first bearing subframe 41 can be integrally formed with the frame 10 or can be provided as an independent component. The first bearing subframe 41 is provided with a moving wheel at the bottom, which can be transferred out from under the second bearing subframe 42 to facilitate cleaning and maintenance of the spinning machine assembly 40, which will be further described in the following content.

[0059] Better, combined Figure 2 , Figure 3A , 3B As shown, the grounding plate 45 is a corrugated plate structure, which includes: a planar substrate 451, and a protrusion 453 formed on the same wall side of the planar substrate 451;

[0060] When the substrate 20 is conveyed through the grounding plate 45 , the substrate 20 is located on the side of the protrusion 453 , and the substrate 20 is conveyed while at least adhering to the protrusion 453 .

[0061] The number and shape of the protrusions 453 formed on the plane 451 can be specifically set as needed, and there are no excessive restrictions in the present invention. When the number of protrusions 453 is multiple, the shape, size, and number of intervals between adjacent protrusions 453 can also be specifically set as needed; of course, when the number of protrusions 453 is multiple, the shapes of the multiple protrusions 453 can be the same or different.

[0062] In the present invention, during the process of the substrate 20 being transported and passing through the nozzle 441 and the grounding plate 45, a liquid jet with a high-voltage charge is continuously ejected from the nozzle 441, flies up to the substrate 20 from the bottom to the top, and is collected to form a film; due to the poor conductivity of the substrate 20, there is a potential difference between the substrate 20 and the grounding plate 45; in addition, the substrate 20 is continuously transported, and the friction between the substrate 20 and the grounding plate 45 generates static charge, and the two are mutually adhered and adsorbed under the action of the electrostatic force. Correspondingly, during the transmission of the substrate 20, it contacts the grounding plate 45 over a large area, and the electrostatic force increases the adhesion between the substrate 20 and the grounding plate 45, thereby increasing the friction during movement, especially when the electrostatic spinning structure is started and stopped, the static friction is relatively large; in this way, during the transmission of the substrate 20, if the tension threshold is not set, the substrate 20 is at risk of being pulled apart, which leads to problems such as overall equipment maintenance, production stagnation, nozzle blockage, and waste of raw materials. The present invention sets the grounding plate 45 as a corrugated board structure, and changes the contact between the substrate 20 and the grounding plate 45 from surface contact to multi-line contact, which can reduce the adhesion between the grounding plate 45 and the substrate 20 under the action of electrostatic force and reduce the friction of relative movement.

[0063] like Figure 3A As shown, in a specific example of the present invention, the shape of the protrusion 453 is set to have an arc-shaped strip cross section, and the cross section of each protrusion 453 connected to the intervals between them is a wave shape;

[0064] like Figure 3B As shown, in another specific example of the present invention, the shape of the protrusion 453 is set to have a strip-shaped cross-section similar to the cross-section of a pacifier.

[0065] Preferably, the second supporting frame 42 is also provided with at least one group of parallel guide rollers 421. After being conveyed through the unwinding assembly 30, the substrate 20 is conveyed to the winding assembly 50 through the guide rollers 421 in sequence. Through the action of the guide rollers 421, the substrate 20 is conveyed at least in contact with the protrusions 453 when passing through the grounding plate 45.

[0066] Preferably, the insulating module 43 comprises: a plurality of insulating plates fixedly overlapped in sequence in a direction perpendicular to the conveying direction of the substrate 20; among the plurality of insulating plates, at least part of the side wall edges of at least one adjacent group of insulating plates have a distance difference in the conveying direction of the substrate.

[0067] The sizes of the multiple insulating plates can be the same or different. For convenience, insulating plates of different sizes can be overlapped and fixed in sequence to form the substrate 20 .

[0068] Accordingly, the number of the insulating plates can be specifically set as needed; the insulating module 43 set as above in the present invention can ensure that when the high voltage electricity creeps on the surface of the insulating module 43, it follows multiple S-shaped curves, thereby increasing the creepage distance of the high voltage electricity to the grounding end of the electrospinning structure.

[0069] The creepage distance is the shortest distance along the surface of the insulating material between two conductive parts with a potential difference; creepage distance = creepage ratio distance * maximum supply voltage. In addition, the creepage distance is also affected by factors such as the size of the contaminated area, air humidity, and voltage level; assuming that the contamination level is level I, the voltage is 100kV, and the creepage ratio distance is 1.6cm / kV, the creepage distance is 1600mm.

[0070] Here, for the spraying module 44, only the nozzle module 44 that is powered by high voltage during operation is arranged above the insulating module 43, and electronic components such as a slide and a drive motor are also arranged below the insulating module 43. The electric charge crawls in a curved shape between the gaps of the insulating plates of the insulating module 43, preferably, in an S-shape. In this way, it is only necessary to ensure that the creeping distance of the charge is greater than the creepage distance obtained by calculating the corresponding spinning voltage and the specific distance, and the electronic components below the insulating module 43 can operate safely, thereby protecting the electric components in the electrostatic spinning structure.

[0071] Preferably, adjacent insulating plates are respectively provided with positioning holes and positioning pins for positioning the two relative to each other; and adjacent insulating plates are glued or fixed by insulating screws.

[0072] Combination Figure 4 , Figure 5 As shown, in a specific example of the present invention, the insulating module 43 is formed by 7 layers of insulating plates overlapping and fixed to each other in the vertical direction, and the 7 layers of insulating plates include: a first insulating plate 431 with a first size and a second insulating plate 433 with a second size, and the first insulating plate 431 and the second insulating plate 433 are overlapped and fixed to each other at intervals;

[0073] Preferably, the first dimension is larger than the second dimension, and in the vertical direction, the axes of the first insulating plate 431 and the second insulating plate 433 are in the same straight line; the first insulating plate and the seventh insulating plate are both first insulating plates 431; in the vertical direction, there is a height difference between the surfaces of two adjacent first insulating plates 431 near the ends.

[0074] Of course, the sizes of the seven layers of insulation boards can also be the same, as long as they are staggered, overlapped and fixed in the vertical direction, the design requirements can be met.

[0075] Combination Figure 6 As shown, the nozzle 441 provided in the first embodiment of the present invention is a first nozzle 441a, and the first nozzle 441a includes: a first main body 4411a, the first main body 4411a has a first main body end 4413a disposed toward the substrate 20, and the outer wall surface of the first main body end 4413a is arc-shaped;

[0076] The first nozzle 441a also includes: a first transmission channel 4415a that runs through the first main body 4411a and is used for conveying liquid, and the outlet 44151a of the first transmission channel 4415a is located at the first main body end 4413a; an annular first boss 4417a that extends radially outward from the outer wall surface of the first main body 4411a along the first main body 4411a, the first boss 4417a is arranged close to the first main body end 4411a, and has a first end face arranged toward the first main body end 4411a; a first groove 44171a that is recessed from the first end face in a direction away from the first end face.

[0077] Preferably, in the radial direction of the first main body 4411a, the cross section of the first groove 44171a is annular; and the opening of the first groove 44171a located at the first end surface is connected to the outer wall surface of the first boss 4417a;

[0078] In the axial direction of the first main body portion 4413a and from the first end surface toward a direction away from the first end surface, the cross-section of the first groove 44171a gradually decreases.

[0079] The first nozzle 441a of this structure, under the action of high pressure, transports liquid through the first transmission channel 4415a and flows out from the outlet 44151a, and then flows along the outer wall surface of the arc-shaped first main body end 4413a to the first groove 44171a. Since the first groove 44171a is located at the opening of the first end face and is connected to the outer wall surface of the first boss 4417a, the side wall of the first groove 44171a and the side wall of the first boss 4417a form an annular blade; under the action of high-voltage static electricity, when the first groove 44171a is filled with liquid, the liquid is discharged at the outlet 44151a of the first transmission channel 4415a and the annular blade, and the charged jet is ejected upward from the outlet 44151a of the first transmission channel 4415a and the annular blade. The design of the first groove 44171a increases the liquid output area, and the design of the annular blade accelerates liquid transportation, effectively improving the output.

[0080] Combination Figure 7As shown, the nozzle 441 provided in the second embodiment of the present invention is a second nozzle 441b, and the second nozzle 441b includes: a second main body portion 4411b, the second main body portion 4411b has a second main body end portion 4413b disposed toward the substrate 20, and the end surface of the second main body end portion 4413b facing the substrate 20 is a second main body end surface;

[0081] A second groove 44131b formed by being recessed from the second main body end surface away from the second main body end surface;

[0082] A second transmission channel 4415b runs through the second main body 4411b and is used for conveying liquid. An outlet 44151b of the second transmission channel 4415b is located on the bottom wall of the second groove 44131b.

[0083] Preferably, in the radial direction of the second main body portion 4413b, the cross section of the second groove 44131b is circular; and the opening of the second groove 44131b located on the end surface of the second main body is connected to the outer wall surface of the second main body portion 4411b;

[0084] In the axial direction of the second main body portion 4411b and from the second main body end surface toward a direction away from the second main body end surface, a cross section of the second groove gradually decreases.

[0085] The second nozzle 441b of the structure, under the action of high pressure, transports liquid through the second transmission channel 4415b and flows out from the outlet 44151b, and is injected into the inverted frustum-shaped second groove 44131b; under the action of high pressure, when the second groove 44131b is filled, the top liquid surface of the second groove 44131b arches upward in an arc, and the surface tension of the liquid gradually decreases; and under the action of high-voltage static electricity, the arched arc liquid surface forms a Taylor cone, and the charged jet is ejected upward; in this process, since the jet is ejected outward in a process in which the electrostatic Coulomb force overcomes the surface tension, the reduced surface tension can reduce the electrostatic Coulomb force required for the jet to eject, and it is easier to form a Taylor cone on the droplet surface, thereby increasing the output of the electrostatic spinning equipment.

[0086] Better, combined Figure 8 As shown, the spinning machine assembly 40 also includes: a moving unit arranged below the first supporting sub-frame 41, and the moving unit includes: a lifting platform frame 411, a lifting assembly 413 arranged on the lifting platform frame 411, a sliding assembly 415, and a moving wheel 417 arranged below the lifting platform frame 411.

[0087] Under the action of the driving motor, the lifting component 413 can drive the insulating module 43 and the nozzle module 44 to reciprocate in the vertical direction, adjust the distance between the spinning unit component 40 and the substrate 20, and thus meet the process requirements; under the action of the driving motor, the sliding component 415 can drive the insulating module 43 and the nozzle module 44 to reciprocate in the horizontal direction, and thus ensure the uniformity of spinning; the setting of the moving wheel 417 can remove the spinning unit component 40 as a whole to facilitate installation, repair, maintenance and cleaning operations.

[0088] In addition, the above-mentioned motor-related electronic control components are all uniformly controlled by the electronic control assembly 70, and the parameters such as swing speed, amplitude, voltage, etc. can be adjusted as needed, which will not be further elaborated here.

[0089] Continue to combine Figure 1 As shown, the upper and lower liquid components 60 include: an upper and lower liquid slide 61 arranged on the frame 10, a liquid storage tank 63 which is arranged in cooperation with the upper and lower liquid slide 61 and reciprocates along the upper and lower liquid slide 61 in the vertical direction, a liquid adding tank 65, a positive pressure tank 67 and a negative pressure tank 69 which are respectively connected to the liquid storage tank 63 through pipelines, and a metering pump 62 and a solenoid valve arranged on the pipeline; the liquid storage tank 63 has a liquid inlet connected to the liquid adding tank through the pipeline, a liquid outlet connected to the nozzle module 44 through the pipeline, an air inlet connected to the positive pressure tank through the pipeline, and an air outlet connected to the negative pressure tank through the pipeline.

[0090] The liquid storage tank 63 is a closed container. During the operation of the equipment, the positive pressure tank 67 and the metering pump 62 cooperate to transport the liquid in the liquid adding tank 65 into the liquid storage tank 63. At the same time, the positive pressure tank 67 applies pressure to the inside of the liquid storage barrel 65 through the air inlet, and presses the liquid into the nozzle module 44 from the liquid outlet. When the equipment is shut down or the equipment needs to be repaired, the negative pressure tank 69 draws gas from the air outlet of the liquid storage tank 63 to provide negative pressure in the cavity of the liquid storage tank 63, thereby drawing the liquid in the nozzle module 44 back from the liquid outlet to the liquid storage tank 63, and further drawing the excess liquid in the liquid storage tank 63 back to the liquid adding tank 65.

[0091] Preferably, when the electrospinning structure is working, the liquid level in the liquid storage tank 63 is ensured to be higher than the outlet of the nozzle 441 in the vertical space height. In this way, when sufficient pressure is provided, the solution can be easily pressed out of the nozzle 441, and the pressure on the liquid surfaces at the outlets of multiple nozzles 441 is balanced, and there will be no uneven liquid spraying amount between needles.

[0092] In an implementation method of the present invention, liquid can be pumped in or out through a metering pump 62 in cooperation with a positive pressure tank 67 and a negative pressure tank 69 to change the relative distance between the liquid level in the liquid storage tank 63 and the outlet of the nozzle 441; the relative distance between the liquid level in the liquid storage tank 63 and the outlet of the nozzle 441 can also be changed by controlling the reciprocating motion of the liquid storage tank 63 on the upper and lower liquid slides 61.

[0093] Correspondingly, the liquid flow rate of the nozzle 441 is controlled by the liquid level in the liquid storage tank 63. The greater the relative distance between the liquid level and the nozzle 441 outlet, the higher the liquid flow rate, and vice versa.

[0094] Preferably, a weighing device can be provided below the liquid storage tank 69 to measure the height of the liquid level in the liquid storage tank 69; or the liquid storage tank 69 can be set to be transparent; or a sensor for measuring the liquid level can be provided on the liquid storage tank 69, etc., which will not be elaborated here.

[0095] When a weighing device is provided below the liquid storage tank 69 , a drag chain may also be provided on the liquid storage tank 69 to ensure that the liquid storage tank 69 does not affect the measurement of the weighing device when it reciprocates along the upper and lower liquid slides 61 .

[0096] Preferably, the electronic control component 70 may include: a power supply, a high-voltage electrostatic generator, a main control unit and other components. The power supply provides power for the entire electrostatic spinning structure. The high-voltage electrostatic generator is electrically connected to the spinning unit component 40 to provide high-voltage static electricity for the spinning unit component 40; the main control unit is connected to each execution terminal, such as: various motors, upper and lower liquid components 60, network communication components, etc., to control the overall operation of the equipment.

[0097] Better, combined Fig. 9 , Fig.10 As shown, the electrospinning structure further includes: a sealing needle assembly 80 selectively combined with the nozzle module 44;

[0098] The sealing needle assembly 80 includes: a sealing needle body 81, a sealing needle hole 83 disposed corresponding to the nozzle 441 and opened on the sealing needle body 81, and a sealing block 83 disposed in the sealing needle hole 83;

[0099] When the sealing needle assembly 80 is selectively combined with the nozzle module 44, the sealing needle body 81 is fixed to the nozzle module 44 through the pipe clamp 87, each nozzle 441 is correspondingly sleeved in the corresponding sealing needle hole 83, and at least the outlet of each nozzle 441 is embedded in the corresponding sealing block 85. In this way, by providing the sealing needle assembly selectively combined with the nozzle module, the residual liquid in the nozzle 441 can be isolated from the outside air in the shutdown state, and the material volatilization and oxidation reaction will no longer occur, thereby avoiding needle clogging.

[0100] It can be understood that the sealing needle body 81 can be set as an integral group corresponding to the nozzle module 44, or can be set as multiple separate groups. In one embodiment of the present invention, a group of sealing needle bodies 81 is respectively set corresponding to each row of nozzles in the nozzle module 44, and the outer contour shape of the sealing needle body 81 is not restricted, for example: cylindrical, square, hexagonal, etc.; the sealing needle hole 83 can be set as a countersunk hole, that is, the opening size of the sealing needle hole 83 is slightly larger than the nozzle 441, so that the nozzle 441 can easily enter the sealing needle hole 83; the material of the sealing block 85 can be made of rubber or silicone material, so as to make it easier to close the opening of the nozzle 441.

[0101] The sealing needle assembly 80 set as above can be selectively combined with the nozzle module 44 as needed. When the electrospinning structure is running, the sealing needle assembly 80 is separated from the nozzle module 44, and the nozzle 441 does not need to do any cleaning work and can start working directly, which greatly improves production efficiency.

[0102] The present invention has an electrostatic spinning structure with multiple nozzles, and an electric control component is arranged to uniformly control the electrostatic spinning structure. The swing speed and amplitude of the nozzle module, the spinning spacing, the spinning flow rate, the high-voltage electrostatic voltage, the substrate speed and the web tension are adjusted in combination with the solution characteristics and the process algorithm, so as to enhance the overall linkage force of the electrostatic spinning structure and save labor costs. By arranging a grounding plate of a corrugated board structure, the friction between the grounding plate and the substrate is reduced, and the risk of the substrate being broken is reduced. The insulating module composed of insulating plates of multiple sizes is used to protect the electric components in the electrostatic spinning structure. By arranging a nozzle with a special structure, the output of the electrostatic spinning structure is improved. By arranging a sealing needle component, the pollution of the raw materials to the environment and the waste of materials are prevented, and the nozzle is protected. The electrostatic spinning structure with multiple nozzles of the present invention has high control accuracy, can meet the requirements of different product processes and quality, is convenient to splice, and has good system compatibility.

[0103] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0104] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electrospinning structure with multiple nozzles, used for spraying a solution to a substrate conveyed by the electrospinning structure through multiple nozzles arranged thereon in an electric field to perform electrospinning; It is characterized in that include: frame; An unwinding assembly, a spinning unit assembly and a winding assembly are arranged on the frame and arranged in sequence according to the substrate conveying direction; An upper and lower liquid component connected to the spinning unit assembly and providing a nozzle module in the spinning unit assembly with a solution sprayed toward a substrate; A sealing needle assembly selectively combined with the nozzle module; and an electric control component for controlling the operation of the electrostatic spinning structure; wherein the spinning unit component comprises: a first bearing subframe, a second bearing subframe fixed to the frame, an insulating module and a nozzle module arranged on the first bearing subframe, and a grounding plate arranged opposite to the nozzle module and arranged on the second bearing subframe; The insulating module comprises: a plurality of insulating plates which are overlapped and fixed in sequence in a direction perpendicular to the substrate conveying direction; among the plurality of insulating plates, at least part of the side wall edges of at least one adjacent group of insulating plates have a distance difference in the substrate conveying direction; The nozzle module includes a plurality of nozzles arranged on the same side of the insulating module, the direction in which the nozzle sprays the solution is perpendicular to the conveying direction of the substrate, and the plurality of nozzles are arranged between the grounding plate and the insulating module; During the process of the substrate being conveyed through the grounding plate, the substrate is located between the nozzle and the grounding plate, and the substrate is conveyed in contact with the grounding plate; The grounding plate is a corrugated plate structure, which includes: a plane substrate, and a protrusion formed on the same wall side of the plane substrate; During the process of the substrate being conveyed through the grounding plate, the substrate is located on the side of the protrusion, and the substrate is conveyed at least in contact with the protrusion; The sealing needle assembly comprises: a sealing needle body, a sealing needle hole arranged corresponding to the nozzle and opened on the sealing needle body, and a sealing block arranged in the sealing needle hole; when the sealing needle assembly is selectively combined with the nozzle module, the sealing needle body is fixed to the nozzle module through a pipe clamp, each nozzle is correspondingly sleeved in the corresponding sealing needle hole, and at least the outlet of each nozzle is embedded in the corresponding sealing block; The upper and lower liquid components include: an upper and lower liquid slide arranged on the frame, a liquid storage tank which is arranged on the upper and lower liquid slides and reciprocates along the upper and lower liquid slides, a liquid adding tank, a positive pressure tank and a negative pressure tank connected to the liquid storage tank through pipelines, and a quantitative pump and a solenoid valve arranged on the pipeline; the liquid storage tank has a liquid inlet connected to the liquid adding tank through the pipeline, a liquid outlet connected to the nozzle module through the pipeline, an air inlet connected to the positive pressure tank through the pipeline, and an air outlet connected to the negative pressure tank through the pipeline; when the electrospinning structure is working, the liquid level in the liquid storage tank is higher than the nozzle outlet in the vertical space height; The spinning machine assembly further includes: a moving unit disposed below the first bearing subframe, the moving unit including: a lifting platform frame, a lifting assembly disposed on the lifting platform frame, a sliding assembly, and a moving wheel disposed below the lifting platform frame; The lifting assembly is used to drive the insulation module and the nozzle module to reciprocate in the vertical direction; the sliding assembly is used to drive the insulation module and the nozzle module to reciprocate in the horizontal direction.

2. The electrospinning structure with multiple nozzles according to claim 1, characterized in that: The nozzle is a first nozzle, and the first nozzle includes: A first main body portion, wherein the first main body portion has a first main body end portion disposed toward the substrate, and an outer wall surface of the first main body end portion is in an arc shape; A first transmission channel that runs through the first main body and is used for conveying liquid, wherein an outlet of the first transmission channel is located at an end of the first main body; An annular first boss extending radially outward from the outer wall surface of the first main body portion along the first main body portion, wherein the first boss is disposed close to an end portion of the first main body and has a first end surface disposed toward the end portion of the first main body; A first groove is formed by being recessed from the first end surface toward a direction away from the first end surface.

3. The electrospinning structure with multiple nozzles according to claim 2, characterized in that: In the radial direction of the first main body, the cross section of the first groove is annular; and the opening of the first groove located at the first end surface is connected to the outer wall surface of the first boss; In the axial direction of the first main body, from the first end surface to a direction away from the first end surface, a cross section of the first groove gradually decreases.

4. The electrospinning structure with multiple nozzles according to claim 1, characterized in that: The nozzle is a second nozzle, and the second nozzle includes: A second main body portion, wherein the second main body portion has a second main body end portion disposed toward the substrate, and an end surface of the second main body end portion facing the substrate is a second main body end surface; A second groove formed by being recessed from the end surface of the second body and away from the end surface of the second body; A second transmission channel runs through the second main body and is used for conveying liquid. The outlet of the second transmission channel is located on the bottom wall of the second groove.

5. The electrospinning structure with multiple nozzles according to claim 4, characterized in that: In the radial direction of the second main body square The cross section of the second groove is circular upward; and the opening of the second groove located on the end surface of the second main body is connected to the outer wall surface of the second main body; In the axial direction of the second main body portion, from the second main body end surface to a direction away from the second main body end surface, a cross section of the second groove gradually decreases.

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