CN113862800A

CN113862800A - Electrostatic spinning structure with multiple spray heads

Info

Publication number: CN113862800A
Application number: CN202111296438.5A
Authority: CN
Inventors: 陶纪文
Original assignee: Changzhou Nuojin Technology Co ltd
Current assignee: Changzhou Nuojin Technology Co ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2021-12-31

Abstract

The invention provides an electrostatic spinning structure with multiple spray heads, which comprises: a frame; the unwinding assembly, the spinning unit assembly and the winding assembly are arranged on the frame and are sequentially arranged according to the conveying direction of the base material; the upper liquid feeding component and the lower liquid feeding component are connected with the spinning machine component, and the electric control component is connected with the spinning machine component; the spinning unit subassembly includes: the sprayer comprises a frame, a first bearing sub-frame, a second bearing sub-frame, an insulation module, a sprayer module, a grounding plate, a first spray nozzle, a second spray nozzle, a first spray nozzle and a second spray nozzle, wherein the first bearing sub-frame and the second bearing sub-frame are fixed on the frame; the spray head module comprises a plurality of spray heads arranged on the same side of the insulation module, and the plurality of spray heads are all arranged between the grounding plate and the insulation module; in the process that the base material is conveyed through the grounding plate, the base material is positioned between the spray head and the grounding plate and is conveyed by being attached to the grounding plate; the electrostatic spinning structure has high control precision and can meet the requirements on the process and quality of different products.

Description

Electrostatic spinning structure with multiple spray heads

Technical Field

The invention relates to the field of electrostatic spinning film manufacturing, in particular to an electrostatic spinning structure with multiple spray heads.

Background

The electrostatic spinning technology adopts high-voltage electrostatic force to accelerate the eruption of the solution, the solution is dragged by the electrostatic force in the extrusion process, the solution is drawn into a nano or micron-sized silk thread under the action of gravity, surface tension and the like, and finally the silk thread flies to the surface of a low-potential substrate to form a layer of film; in the spinning process, when the coulomb force borne by the solution is enough to overcome gravity, surface tension and the like, the jet flow obtains upward resultant force to form jet trickle, and the jet trickle is pulled by electric power to form fiber filaments.

In the prior art, the fiber ribbons are high-voltage electricity, and like-polarity charges repel each other in the jetting process, so that the thickness distribution of a film on a receiving cloth is not uniform; in general, when a single spray head is adopted, the thickness of a material layer is that the center of a nozzle excitation point projected on a receiving cloth is thinner, the material layer is thickened annularly, and the material layer extends outwards and becomes thinner gradually; when the multi-nozzle is adopted, the film layer has the characteristic of a single needle, the film area formed on the receiving cloth is shaped like a cow tongue, the outline between cow tongue plaques is clear, and the repulsion force is generated by charges in the same direction when the charged solution is sprayed to the receiving cloth. Thus, difficulties are brought to the industrial-scale production of electrospinning.

In order to solve the above problems, there are currently 2 kinds of solutions, line electric excitation and rotation excitation. The solution is smeared on a high-voltage metal wire by electric excitation, and continuous spinning is formed by adopting a rotary liquid dipping device by rotary excitation. But the problems of high machining and assembling requirements, non-uniform liquid soaking and uncontrollable spinning flow exist in both the electric excitation and the rotary excitation. The needle spinning has great advantages in maintaining stable spinning quality and controlling spinning flow and yield. Therefore, the optimization and transformation, the promotion of the advantages and the avoidance of the disadvantages of the multi-needle spinning technology are important subjects with research significance.

Disclosure of Invention

The invention aims to provide an electrostatic spinning structure with multiple spray heads.

In order to achieve the above object, the present invention provides an electrospinning structure having a plurality of nozzles for spraying a solution to a base material transferred to the electrospinning structure through the plurality of nozzles provided thereon in an electric field to perform electrospinning; the electrostatic spinning structure with the multiple spray heads specifically comprises: a frame;

the unwinding assembly, the spinning unit assembly and the winding assembly are arranged on the frame in sequence according to the conveying direction of the base material;

the upper liquid feeding and discharging assembly is connected with the spinning machine assembly and provides a solution sprayed to the base material for a spray head module in the spinning unit assembly;

the electric control assembly is used for controlling the electrostatic spinning structure to run;

wherein, the spinning unit subassembly includes: the sprayer comprises a first bearing sub-frame, a second bearing sub-frame, an insulation module, a sprayer module, a grounding plate, a first spray nozzle, a second spray nozzle, a first spray nozzle and a second spray nozzle, wherein the second spray nozzle is fixed on the frame;

the sprayer module comprises a plurality of sprayers arranged on the same side of the insulation module, the direction of spraying solution by the sprayers is vertical to the conveying direction of the base material, and the sprayers are all arranged between the grounding plate and the insulation module;

during the process that the base material is conveyed through the grounding plate, the base material is positioned between the spray head and the grounding plate, and the base material is conveyed on the grounding plate in a manner of being attached to the grounding plate.

As a further improvement of the present invention, the ground plate is a corrugated plate structure, which includes: the flat substrate and the bulge formed on the same wall surface side of the flat substrate;

and in the process that the substrate is conveyed through the grounding plate, the substrate is positioned on the convex side, and the substrate at least fits the convex conveying.

As a further improvement of the present invention, the insulation module includes: a plurality of insulating plates which are sequentially overlapped and fixed in a direction vertical to the conveying direction of the base material;

at least a part of the side wall edges of at least one adjacent group of the plurality of insulating plates have a difference in distance in the substrate conveyance direction.

As a further improvement of the present invention, the spray head is a first spray head, and the first spray head includes:

a first body portion having a first body end portion provided toward the base material, an outer wall surface of the first body end portion being a circular arc shape;

the first transmission channel penetrates through the first main body part and is used for transmitting liquid to circulate, and an outlet of the first transmission channel is positioned at the end part of the first main body;

the first boss is arranged close to the end part of the first main body and provided with a first end face arranged towards the end part of the first main body;

the first groove is formed by sinking from the first end surface to the direction far away from the first end surface.

As a further improvement of the present invention, in the radial direction of the first main body portion, the cross section of the first groove is annular; an opening of the first groove, which is positioned on the first end face, is communicated with the outer wall surface of the first boss;

in the axial direction of the first main body part, the cross section of the first groove is gradually reduced from the first end surface to the direction far away from the first end surface.

As a further improvement of the present invention, the spray head is a second spray head, and the second spray head includes:

a second main body part, wherein the second main body part is provided with a second main body end part facing the base material, and the end face of the second main body end part facing the base material is a second main body end face;

a second groove formed by sinking from the end face of the second main body to the end face far away from the second main body;

and the second transmission channel penetrates through the second main body part and is used for conveying liquid to circulate, and an outlet of the second transmission channel is positioned on the bottom wall surface of the second groove.

As a further improvement of the present invention, in the radial direction of the second main body portion, the cross section of the second groove is circular; the opening of the second groove on the end face of the second main body is communicated with the outer wall surface of the second main body;

in the axial direction of the second main body part, the cross section of the second groove gradually becomes smaller from the end face of the second main body part to the direction far away from the end face of the second main body part.

As a further improvement of the present invention, the electrospinning structure further comprises: a needle sealing assembly selectively combined with the spray head module;

the needle sealing assembly comprises: the sealing device comprises a needle sealing main body, a needle sealing hole and a sealing block, wherein the needle sealing main body is arranged corresponding to the spray head and is arranged on the needle sealing main body;

when the needle sealing assembly is selectively combined with the spray head module, the needle sealing main body is fixed on the spray head module through a pipe clamp, each spray head is correspondingly sleeved in the corresponding needle sealing hole, and at least the outlet of each spray head is embedded in the corresponding sealing block.

As a further improvement of the present invention, the spinner assembly further comprises: a mobile unit disposed below the first carrier sub-frame, the mobile unit comprising: the lifting platform comprises 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;

the lifting assembly is used for driving the insulation module and the spray head module to reciprocate in the vertical direction; the sliding assembly is used for driving the insulation module and the spray head module to reciprocate in the horizontal direction.

As a further improvement of the invention, the liquid feeding and discharging assembly comprises: the liquid storage tank is matched with the upper liquid sliding table and the lower liquid sliding table and reciprocates along the upper liquid sliding table and the lower liquid sliding table, the liquid feeding tank, the positive pressure tank and the negative pressure tank are respectively connected with the liquid storage tank through pipelines, and the quantitative pump and the electromagnetic valve are arranged on the pipelines;

the liquid storage tank is provided with a liquid inlet connected with the liquid adding tank through the pipeline, a liquid outlet connected with the spray head module through the pipeline, an air inlet connected with the positive pressure tank through the pipeline, and an air outlet connected with the negative pressure tank through the pipeline;

when the electrostatic spinning structure works, the liquid level in the liquid storage tank is higher than the outlet of the spray head in the vertical space height.

The invention has the beneficial effects that: the electrostatic spinning structure with the multiple spray heads is provided with the electric control assembly to uniformly control the electrostatic spinning structure, so that the integral linkage force of the electrostatic spinning structure is enhanced, and the labor cost is saved; the control precision is high, the requirements on the process and the quality of different products can be met, the splicing is convenient, and the system compatibility is good.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an electrospinning structure having multiple nozzles according to the present invention;

fig. 2 is a schematic structural diagram of a grounding plate according to an embodiment of the present invention;

fig. 3A and 3B are schematic cross-sectional views of a grounding plate according to various embodiments of the present invention;

fig. 4 is a schematic structural diagram of an insulation module according to an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion shown in circle A of FIG. 4;

FIGS. 6 and 7 are schematic cross-sectional views of a showerhead according to various embodiments of the present invention;

FIG. 8 is a perspective view of a portion of the component parts of FIG. 1;

FIG. 9 is an exploded view of the needle sealing assembly and the nozzle module according to one embodiment of the present invention;

fig. 10 is a schematic structural view illustrating the needle sealing assembly and the nozzle module according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. The present invention is not limited to the embodiment, and structural, methodological, or functional changes made by one of ordinary skill in the art according to the embodiment are included in the scope of the present invention.

Referring to fig. 1, the present invention provides an electrospinning structure having multiple nozzles for spraying a solution to a base material transferred to the electrospinning structure through the multiple nozzles disposed thereon in an electric field to perform electrospinning.

The electrospinning structure comprises: a frame 10; the unreeling component 30, the spinning unit component 40 and the reeling component 50 are arranged on the frame 10 and are sequentially arranged in the conveying direction of the base material 20; a liquid feeding and discharging assembly 60 connected to the spinning machine assembly 40 and providing the solution sprayed to the base material 20 for the nozzle module in the spinning machine assembly 40; and an electric control assembly 70 for controlling the operation of the electrospinning structure;

preferably, in practical applications, in order to improve the stability of the device and improve the quality of the product, the electrospinning structure with multiple nozzles is preferably placed in a closed room for work, and more preferably, a constant temperature and humidity system can be added in the closed room to adjust the ambient temperature.

The unwinding assembly 30 includes: the unwinding device comprises an unwinding frame 31, an unwinding air inflation shaft 33 arranged on the unwinding frame 31, an unwinding reel 35 arranged by taking the unwinding air inflation shaft 33 as a pivot shaft, and an unwinding driving motor arranged on the unwinding frame 31 and used for driving the unwinding air inflation shaft 33 to rotate; the unreeling tension testing unit 37 and the beam roller 39 are arranged on the unreeling frame 31 and are sequentially arranged behind the unreeling reel 35 in the conveying direction of the base material 20, the beam roller 39 is used for guiding the base material 20 to run, and the driving motor is usually formed by matching a servo motor and a speed reducer.

Accordingly, the winding assembly 50 is generally symmetrically disposed with respect to the unwinding assembly 30 at both sides of the spin pack assembly 40. In an embodiment of the present invention, the winding assembly 50 includes: the winding mechanism comprises a winding frame 51, a winding air expansion shaft arranged on the winding frame 51, a winding scroll 55 arranged by taking the winding air expansion shaft as a pivot shaft, and a winding driving motor arranged on the winding frame 51 and used for driving the winding air expansion shaft to rotate; set up in rolling frame 51 and in substrate 20 direction of transfer set gradually in rolling tension test unit and beam barrel in rolling axle 55 the place ahead, the beam barrel is used for guiding substrate 20 operation.

The substrate 20 is typically a woven receiving cloth.

The spin pack assembly 40 includes: a first sub-carrier 41, a second sub-carrier 42 fixed to the frame 10, an insulating module 43 and a head module 44 disposed on the first sub-carrier 41, and a ground plate 45 disposed opposite to the head module 44 and disposed on the second sub-carrier 42;

the nozzle module 44 includes a plurality of nozzles 441 disposed on the same side of the insulating module 43, the direction of the solution sprayed by the nozzles 441 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;

during the process of transferring the substrate 20 through the grounding plate 45, the substrate 20 is located between the showerhead 441 and the grounding plate 45, and the substrate 20 is transferred against the grounding plate 45 by the electrostatic attraction of the grounding plate 45.

The first sub-carrier 41 may be integrally formed with the frame 10, or may be provided as a separate component. The first sub-carrier 41 is provided with a movable wheel at the lower part thereof, which can be transferred out from the second sub-carrier 42, so as to facilitate the cleaning and maintenance of the spinner assembly 40, as will be described further below.

Preferably, as shown in fig. 2, fig. 3A and fig. 3B, the grounding plate 45 is a corrugated plate structure, which includes: a planar substrate 451, and a projection 453 formed on the same wall surface side of the planar substrate 451;

during the process of transferring the substrate 20 through the grounding plate 45, the substrate 20 is located at the side of the protrusions 453, and the substrate 20 is transferred at least in conformity with the protrusions 453.

The number and shape of the protrusions 453 formed on the plane 451 may be specifically set as required, but not limited in the present invention, and when the number of the protrusions 453 is plural, the shape, size, and number of the intervals between adjacent protrusions 453 may also be specifically set as required; of course, when the number of the projections 453 is plural, the shapes of the plural projections 453 may be the same or different.

In the invention, when the base material 20 is conveyed and passes through the spray head 441 and the grounding plate 45, the liquid jet with high voltage charge is continuously sprayed out of the spray head 441, flies up to the base material 20 from bottom to top and is collected to form a film; because of the poor conductivity of the substrate 20, there is a potential difference between the substrate 20 and the ground plate 45; further, the base material 20 is continuously transferred, and the base material 20 and the ground plate 45 rub against each other to generate electrostatic charge, and the both adhere to each other and are attracted by electrostatic force. Correspondingly, the base material 20 is in large-area contact with the grounding plate 45 in the conveying process, the electrostatic force increases the attaching force between the base material 20 and the grounding plate 45, the friction force during movement is increased, and particularly, the static friction force is larger when the electrostatic spinning structure is started and stopped; thus, in the process of transferring the base material 20, under the condition that the tension threshold value is not set, the base material 20 is in a risk of being pulled apart, and further, the problems of overall equipment maintenance, production stagnation, nozzle blockage, raw material waste and the like are caused. The present invention changes the contact between the base material 20 and the grounding plate 45 from surface contact to multi-line contact by arranging the grounding plate 45 in a corrugated plate structure, so that the adhesion between the grounding plate 45 and the base material 20 under the action of electrostatic force can be reduced, and the friction force of relative movement can be reduced.

As shown in fig. 3A, in a specific example of the present invention, the protrusions 453 are shaped as a strip with an arc-shaped cross section, and the cross section of each protrusion 453 connected to the protrusion at intervals is wavy;

in another embodiment of the present invention, as shown in fig. 3B, the protrusion 453 has a shape of a bar having a cross section similar to that of a nipple.

Preferably, the second carrier sub-frame 42 is further provided with a guiding roller 421 for at least one set of parallel arrangement, the base material 20 is conveyed through the unwinding assembly 30, and then conveyed to the winding assembly 50 through the guiding roller 421, and the base material 20 is conveyed while being attached to at least the protrusion 453 through the action of the guiding roller 421 when passing through the grounding plate 45.

Preferably, the insulation module 43 includes: a plurality of insulating plates fixed in an overlapping manner in order in a direction perpendicular to the conveying direction of the base material 20; at least a part of the side wall edges of at least one adjacent group of the plurality of insulating plates have a difference in distance in the substrate conveyance direction.

The sizes of the insulating plates can be the same or different, and the insulating plates with different sizes can be adopted to be sequentially overlapped and fixed to form the base material 20.

Correspondingly, the number of the insulating plates can be specifically set according to needs; the insulating module 43 provided by the invention can ensure that a plurality of S-shaped curves are formed when high-voltage electricity climbs on the surface of the insulating module 43, so that the creepage distance of the high-voltage electricity to the grounding end of the electrostatic spinning structure is increased.

The creepage distance is the shortest distance between two conductive parts with potential difference along the surface of the insulating material; the creepage distance is equal to the creepage specific distance and supplies the highest voltage, and in addition, the creepage distance is also influenced by factors such as the area size of dirt, air humidity, voltage height and the like; and if the pollution grade is I grade, the voltage is 100kV, the creepage specific distance is 1.6cm/kV, and the creepage distance is 1600 mm.

Here, to spraying module 44, only the shower nozzle module 44 that the during operation leads to high-tension electricity set up in the top of insulating module 43, the below of insulating module 43 still is provided with electronic components such as slip table, driving motor, and the electric charge is the curvilinear figure between the gap of each insulation board of insulating module 43 and crawls, preferentially, the journey S-shaped crawls, so, only need guarantee that the distance that the electric charge crawled is greater than the creepage distance that corresponds spinning voltage and specific distance calculation obtained, but then electronic components below insulating module 43 safe operation, and then the protection electronic components in the electrostatic spinning structure.

Preferably, the adjacent insulating plates are respectively provided with a positioning hole and a positioning pin for mutually positioning the two insulating plates; the adjacent insulating plates are glued or fixed by insulating screws.

Referring to fig. 4 and 5, in a specific example of the present invention, the insulating module 43 is formed by overlapping and fixing 7 insulating plates in a vertical direction, and the 7 insulating plates include: a first insulating plate 431 with a first size and a second insulating plate 433 with a second size, wherein the first insulating plate 431 and the second insulating plate 433 are fixed in a mutually spaced and overlapped mode;

preferably, the first dimension is larger than the second dimension, and the axes of the first insulating plate 431 and the second insulating plate 433 are in the same straight line in the vertical direction; the 1 st and 7 th insulating plates are both first insulating plates 431; in the vertical direction, the faces of two adjacent first insulating plates 431 near the ends have a height difference therebetween.

Of course, the size of the seven layers of insulating plates can be the same, and the design requirements can be met as long as the seven layers of insulating plates are fixed in a staggered and overlapped mode in the vertical direction.

Referring to fig. 6, a nozzle 441 according to a first embodiment of the present invention is a first nozzle 441a, where the first nozzle 441a includes: a first body portion 4411a, the first body portion 4411a having a first body end portion 4413a provided toward the base material 20, an outer wall surface of the first body end portion 4413a being in a circular arc shape;

the first spray head 441a further includes: a first transfer passage 4415a penetrating the first body portion 4411a and adapted to transfer a liquid therethrough, an outlet 44151a of the first transfer passage 4415a being located at the first body end portion 4413 a; an annular first boss 4417a extending radially outward from an outer wall surface of the first body portion 4411a along the first body portion 4411a, the first boss 4417a being disposed adjacent to the first body end portion 4411a and having a first end surface disposed toward the first body end portion 4411 a; a first groove 44171a concavely formed from the first end surface in a direction away from the first end surface.

Preferably, the first groove 44171a has an annular cross section in the radial direction of the first body portion 4411 a; the opening of the first groove 44171a on the first end surface is communicated with the outer wall surface of the first boss 4417 a;

the first groove 44171a has a cross section that gradually decreases in the axial direction of the first body portion 4413a from the first end surface toward the direction away from the first end surface.

Under the action of high pressure, the first nozzle 441a of the structure flows along the outer wall surface of the circular arc-shaped first body end 4413a to the first groove 44171a after the conveyed liquid passes through the first conveying channel 4415a and flows out of the outlet 44151a, and the opening of the first groove 44171a at the first end surface is communicated with the outer wall surface of the first boss 4417a, so that an annular edge is formed at the position where the side wall of the first groove 44171a shares the side wall of the first boss 4417 a; under the action of high-voltage static electricity, when the first groove 44171a is filled with liquid, the liquid discharges at the outlet 44151a of the first transmission channel 4415a and the annular blade, the charged jet is ejected upwards from the outlet 44151a of the first transmission channel 4415a and the annular blade, the liquid output area is increased by the design of the first groove 44171a, the liquid transmission is accelerated by the design of the annular blade, and the yield is effectively improved.

Referring to fig. 7, a nozzle 441 according to a second embodiment of the present invention is a second nozzle 441b, where the second nozzle 441b includes: a second main body portion 4411b, the second main body portion 4411b having a second main body end portion 4413b provided toward the base material 20, and an end face of the second main body end portion 4413b toward the base material 20 being a second main body end face;

a second groove 44131b concavely formed from a second body end face to a position away from the second body end face;

a second transfer passage 4415b penetrating the second body portion 4411b and communicating the liquid, an outlet 44151b of the second transfer passage 4415b being located on a bottom wall surface of the second groove 44131 b.

Preferably, the cross-section of the second groove 44131b in the radial direction of the second body part 4413b is circular; the opening of the second groove 44131b on the end surface of the second body is communicated with the outer wall surface of the second body 4411 b;

the second groove has a cross section gradually decreasing in the axial direction of the second body portion 4411b from the second body end surface toward a direction away from the second body end surface.

The second nozzle 441b of this structure injects the liquid, which is transported under high pressure, into the second groove 44131b in the shape of an inverted truncated cone after passing through the second transfer channel 4415b and flowing out of the outlet 44151 b; under the action of high pressure, after the second groove 44131b is filled, the liquid level at the top end of the second groove 44131b is arched upwards to form an arc shape, and the liquid surface tension is gradually reduced; under the action of high-voltage static electricity, the arched arc-shaped liquid level forms a Taylor cone and sprays charged jet flow upwards; in the process, the jet flow is sprayed out to overcome the surface tension by the electrostatic coulomb force, so that the electrostatic coulomb force required by the jet flow spraying is reduced by reducing the surface tension, and the Taylor cone is more easily formed on the surface of the liquid drop, thereby increasing the yield of the electrostatic spinning equipment.

Preferably, as shown in fig. 8, the spinner assembly 40 further comprises: a moving unit disposed under the first carrier sub-frame 41, the moving unit including: a lifting platform frame 411, a lifting component 413 arranged on the lifting platform frame 411, a sliding component 415 and a moving wheel 417 arranged below the lifting platform frame 411.

The lifting component 413 can drive the insulation module 43 and the spray head module 44 to reciprocate in the vertical direction under the action of the driving motor, and the distance between the spinning unit component 40 and the base material 20 is adjusted, so that the process requirements are met; the sliding component 415 can drive the insulation module 43 and the spray head module 44 to reciprocate in the horizontal direction under the action of the driving motor, so that the uniformity of spinning is ensured; the movable wheels 417 are provided to allow the entire spinner assembly 40 to be removed for ease of installation, maintenance and cleaning.

In addition, the electric control components related to the motor are uniformly controlled by the electric control assembly 70, and parameters such as swing speed, amplitude, voltage and the like can be adjusted as required, which is not further described herein.

Continuing with FIG. 1, the upper and lower fluid assemblies 60 include: an upper liquid sliding table 61 and a lower liquid sliding table 61 which are arranged on the framework 10, a liquid storage tank 63 which is matched with the upper liquid sliding table 61 and the lower liquid sliding table 61 and reciprocates along the upper liquid sliding table 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 with the liquid storage tank 63 through pipelines, and a constant delivery pump 62 and an electromagnetic valve which are arranged on the pipelines; the liquid storage tank 63 is provided with a liquid inlet connected with the pipeline of the liquid adding tank and a liquid outlet connected with the pipeline of the spray head module 44, and is also provided with a gas inlet connected with the positive pressure tank through the pipeline and a gas outlet connected with the negative pressure tank through the pipeline.

The liquid storage tank 63 is a closed container, in the operation process of the equipment, the positive pressure tank 67 and the dosing pump 62 cooperate to convey liquid in the liquid adding tank 65 into the liquid storage tank 63, and meanwhile, the positive pressure tank 67 applies pressure to the interior of the liquid storage barrel 65 through the air inlet to press the liquid into the spray head module 44 from the liquid outlet; when equipment is shut down or needs to be maintained, the negative pressure tank 69 is pumped out gas from the gas outlet of the liquid storage tank 63 to provide negative pressure in the cavity of the liquid storage tank 63, so that the liquid of the spray head module 44 is pumped back to the liquid storage tank 63 from the liquid outlet, and further, redundant liquid in the liquid storage tank 63 is pumped back to the liquid adding tank 65.

Preferably, when the electrostatic spinning structure works, the liquid level in the liquid storage tank 63 is ensured to be higher than the outlets of the nozzles 441 in the vertical space height, so that when enough pressure is provided, the solution is easily extruded out of the nozzles 441, the pressure on the liquid level at the outlets of the nozzles 441 is balanced, and the condition that the liquid spraying amount among the needles is not uniform can not occur.

In an implementation mode of the invention, liquid can be pumped in by matching the constant displacement pump 62 with the positive pressure tank 67 and the negative pressure tank 69, or the liquid can be pumped out to change the relative distance between the liquid level of the liquid in the liquid storage tank 63 and the outlet of the spray head 441; the relative distance between the liquid level in the liquid storage tank 63 and the outlet of the head 441 can also be changed by controlling the reciprocating movement of the liquid storage tank 63 on the upper and lower liquid sliding tables 61.

Correspondingly, the liquid outlet flow of the spray head 441 is controlled by the liquid level in the liquid storage tank 63, and the larger the relative distance between the liquid level and the outlet of the spray head 441 is, the higher the liquid outlet flow is, and conversely, the smaller the liquid outlet flow is.

Preferably, a weighing device can be cooperatively arranged below the liquid storage tank 69 for measuring and calculating the height of the liquid level in the liquid storage tank 69; or the reservoir 69 may be made transparent; or a sensor for measuring the liquid level may be provided in the liquid storage tank 69, which will not be described in detail herein.

When the below cooperation of liquid reserve tank 69 sets up weighing-appliance, still can cooperate on the liquid reserve tank 69 to set up the tow chain to when guaranteeing that liquid reserve tank 69 along upper and lower liquid slip table 61 reciprocating motion, do not influence weighing-appliance's measurement.

Preferably, the electronic control assembly 70 may include: the high-voltage electrostatic spinning device comprises a power supply, a high-voltage electrostatic generator, a main control unit and other elements, wherein the power supply provides power for the whole electrostatic spinning structure, and the high-voltage electrostatic generator is electrically connected with the spinning unit assembly 40 and is used for providing high-voltage static electricity for the spinning unit assembly 40; the main control unit is connected with each execution terminal, and the execution terminals are, for example: various motors, a liquid feeding and discharging component 60, a network communication component and the like, and further controls the overall operation condition of the equipment.

Preferably, as shown in fig. 9 and 10, the electrospinning structure further includes: a needle sealing assembly 80 selectively combined with the head module 44;

the needle sealing assembly 80 includes: a needle sealing body 81, a needle sealing hole 83 arranged corresponding to the nozzle 441 and opened on the needle sealing body 81, and a sealing block 83 arranged in the needle sealing hole 83;

when the needle sealing assembly 80 is selectively combined with the nozzle module 44, the needle sealing main body 81 is fixed on the nozzle module 44 through the pipe clamp 87, each nozzle 441 is correspondingly sleeved in the corresponding needle sealing hole 83, and at least the outlet of each nozzle 441 is embedded in the corresponding sealing block 85. So, through setting up the needle subassembly that seals with shower nozzle module selective combination, can be under the shutdown state for remaining liquid is isolated with the outside air in the shower nozzle 441, no longer takes place the reaction of material volatilization and oxidation, has avoided the syringe needle to block up.

It can be understood that the needle sealing main bodies 81 may be arranged as a whole group corresponding to the nozzle modules 44, or may be arranged as a plurality of separate groups, in an embodiment of the present invention, a group of needle sealing main bodies 81 is respectively arranged corresponding to each row of nozzles in the nozzle modules 44, and the outer shape of the needle sealing main bodies 81 is not limited, for example: cylindrical, square, hexagonal, etc.; the needle sealing hole 83 can be a countersunk hole, that is, the opening size of the needle sealing hole 83 is slightly larger than that of the spray head 441, so that the spray head 441 can easily enter the needle sealing hole 83; the sealing block 85 may be made of rubber or silicone so as to more easily seal the opening of the nozzle 441.

The needle sealing assembly 80 arranged as above can be selectively combined with the nozzle module 44 as required, when the electrostatic spinning structure operates, the needle sealing assembly 80 is separated from the nozzle module 44, and the nozzle 441 can directly start to work without any cleaning work, so that the production efficiency is greatly improved.

The electrostatic spinning structure with the multiple spray heads is provided with the electronic control assembly to uniformly control the electrostatic spinning structure, and the swing speed, amplitude, spinning distance, spinning flow, high-voltage electrostatic voltage, substrate speed and web tension of the spray head module are adjusted by combining the characteristics of a solution and a process algorithm, so that the overall linkage force of the electrostatic spinning structure is enhanced, and the labor cost is saved; the friction force between the grounding plate and the base material is reduced by arranging the grounding plate with the corrugated plate structure, and the risk that the base material is broken by pulling is reduced; protecting an electric component in the electrostatic spinning structure through an insulation module formed by overlapping multi-size insulation plates; the yield of the electrostatic spinning structure is improved by arranging the spray head with a special structure; the multi-nozzle electrostatic spinning structure has high control precision, can meet the requirements on the process and quality of different products, is convenient to splice, and has good system compatibility.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. An electrospinning structure having a plurality of nozzles for ejecting a solution to a base material conveyed by the electrospinning structure through the plurality of nozzles provided thereon in an electric field to perform electrospinning;

it is characterized by comprising: a frame;

and in the process of conveying the substrate through the grounding plate, the substrate is positioned between the spray head and the grounding plate, and the substrate is conveyed along the grounding plate.

2. The electrospinning structure of claim 1, wherein the ground plate is a corrugated plate structure comprising: the flat substrate and the bulge formed on the same wall surface side of the flat substrate;

3. The electrospinning structure of claim 1, wherein the insulation module comprises: a plurality of insulating plates which are sequentially overlapped and fixed in a direction vertical to the conveying direction of the base material;

4. The electrospinning structure of claim 1, wherein the nozzle is a first nozzle comprising:

5. The electrospinning structure of claim 4, wherein the cross-section of the first groove in the radial direction of the first main body portion is annular; an opening of the first groove, which is positioned on the first end face, is communicated with the outer wall surface of the first boss;

6. The electrospinning structure of claim 1, wherein the nozzle is a second nozzle comprising:

7. The electrospinning structure of claim 6, wherein the cross-section of the second grooves in the radial direction of the second main body portion is circular; the opening of the second groove on the end face of the second main body is communicated with the outer wall surface of the second main body;

8. The electrospinning structure of claim 1, wherein the electrospinning structure further comprises: a needle sealing assembly selectively combined with the spray head module;

9. The electrospinning structure of claim 1, wherein the spinner assembly further comprises: a mobile unit disposed below the first carrier sub-frame, the mobile unit comprising: the lifting platform comprises 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;

10. The electrospinning structure of claim 1, wherein the upper and lower liquid assemblies comprise: the liquid storage tank is matched with the upper liquid sliding table and the lower liquid sliding table and reciprocates along the upper liquid sliding table and the lower liquid sliding table, the liquid feeding tank, the positive pressure tank and the negative pressure tank are respectively connected with the liquid storage tank through pipelines, and the quantitative pump and the electromagnetic valve are arranged on the pipelines;