CN108034995B - Solid needle electrostatic spinning equipment - Google Patents
Solid needle electrostatic spinning equipment Download PDFInfo
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- CN108034995B CN108034995B CN201810033584.0A CN201810033584A CN108034995B CN 108034995 B CN108034995 B CN 108034995B CN 201810033584 A CN201810033584 A CN 201810033584A CN 108034995 B CN108034995 B CN 108034995B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention discloses solid needle electrostatic spinning equipment which comprises a spinning system, a fiber receiving system, a liquid supply system, a power supply system and a control system, wherein the spinning system is used for spinning fibers; the spinning system comprises a plurality of spinning nozzles, a liquid guide fixing pipe for fixing the spinning nozzles and an insulating cover arranged on each spinning nozzle and used for carrying out electrostatic isolation on the spinning nozzles; the spinneret comprises a spinneret body, a connecting seat positioned at one end of the spinneret body and a plurality of solid needles positioned at the other end of the spinneret body, wherein a liquid supply cavity is arranged in the spinneret body, a liquid inlet pipe communicated with the liquid supply cavity is arranged in the connecting seat, one end of each solid needle extends into the liquid supply cavity, the other end of each solid needle extends out of the spinneret body, and a gap is formed between each solid needle and the spinneret body; a liquid storage cavity is arranged in the liquid guide fixing pipe. The device can avoid electrostatic repulsion of the spinning needles and can arrange the spinning needles at smaller intervals so as to obtain better electrostatic spinning products.
Description
Technical Field
The invention relates to electrostatic spinning equipment, in particular to solid needle electrostatic spinning equipment.
Background
The nanofiber refers to superfine fibers with fiber diameters ranging from tens of nanometers to hundreds of nanometers, and compared with common fibers, the nanofiber membrane material with the three-dimensional porous structure, which is formed by stacking nanofibers, has the characteristics of high specific surface area, high porosity and the like, has the advantages of small pore diameter, high porosity, good connectivity, controllable stacking density and the like, and can be used as a basic construction element of nano science and technology; in the production process of the nanofiber by the electrostatic spinning method, not only the fiber diameter, the fiber morphology and the fiber structure can be regulated and controlled, but also the functional nanofiber with different functions can be obtained easily by using a functional polymer or adding functional chemical substances, and the functional nanofiber has numerous excellent performances, so that the functional nanofiber is successfully applied to the fields of filtration, catalysts or enzyme carriers, tissue engineering, drug release, sensors, energy storage, textile clothing and the like at present.
In the existing electrostatic spinning device, in order to improve production efficiency, a plurality of needle spinnerets are usually arranged, and in the working process, the plurality of needle spinnerets simultaneously carry out electrostatic spinning tasks, and because each needle spinneret is electrified, each needle spinneret with points generates electrostatic fields, the plurality of electrostatic fields generated by the plurality of needle spinnerets are mutually interfered, so that nanofibers sprayed from the needle spinnerets are irregularly bent and arranged, the spinning is uneven, and the spinning quality is greatly reduced; in addition, nanofibers are deflected outward during spraying, and cannot be received on the receiving base fabric.
In order to overcome the problems, the patent application document with the application publication number of CN 106119995A discloses a solid needle spinneret electrostatic spinning device, which comprises a liquid supply system, a solid needle spinneret spinning system, a lifting system, a power supply system, a receiving system and a control system, wherein the solid needle spinneret spinning system consists of a solid needle spinneret, a metal wire, an insulating liquid guide rod, a support plate and a spinneret liquid storage box, the axis of the insulating liquid guide rod is provided with a central hole, the aperture is equal to the diameter of a needle body of the solid needle spinneret, and the solid needle spinneret is inserted into the central hole of the insulating liquid guide rod; n rows of through holes which are arranged at equal intervals are formed in the middle of the supporting plate, the aperture of the through holes is equal to the diameter of a middle cylinder of the insulating liquid guide rod, and the insulating liquid guide rod is arranged in the through holes in the supporting plate; the bottom of the spinneret liquid storage box is provided with N rows of conical spinneret holes which are arranged at equal intervals, the diameter of each hole is equal to that of the middle cylinder of the insulating liquid guide rod, the top of each hole is provided with a groove, the outline dimension of each groove is equal to that of the supporting plate, the supporting plates are arranged in the grooves of the spinneret liquid storage box, the supporting plates are connected with a lifting system, and the cones at the bottom of the insulating liquid guide rod penetrate through the conical spinneret through holes at the bottom of the spinneret liquid storage box and are in close contact with each other. When the device works, the lifting system drives the supporting plate to move upwards, so that the gap between the insulating liquid guide rod and the conical sinking spinneret part is increased, liquid drops flow out along the conical bottom of the insulating liquid guide rod, and the liquid drops generate Taylor cones under the excitation of an electric field to form nanofibers. Because each solid needle spinneret is arranged in the insulating guide rod in the device, the interference of electrostatic repulsion can be obviously weakened, and the spinning is more uniform and better in spinning effect.
However, the device has the following problems in actual production: because the solid needle spinneret is arranged in the insulating liquid guide rod, the diameter of the insulating liquid guide rod is much larger than that of the solid needle spinneret, so that the arrangement interval of the solid needle spinneret is larger, and when certain production processes require that the solid needle spinneret is arranged at smaller intervals, the conventional device cannot be used.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides solid needle electrostatic spinning equipment which can not only avoid electrostatic repulsion of spinning needles, but also enable the spinning needles to be arranged at smaller intervals so as to obtain better electrostatic spinning products.
The technical scheme for solving the technical problems is as follows:
a solid needle electrostatic spinning device comprises a spinning system, a fiber receiving system, a liquid supply system, a power supply system and a control system;
the spinning system comprises a plurality of spinning nozzles, a liquid guide fixing pipe for fixing the spinning nozzles and an insulating cover arranged on each spinning nozzle and used for carrying out electrostatic isolation on the spinning nozzles; the spinneret comprises a spinneret body, a connecting seat positioned at one end of the spinneret body and used for being connected with a liquid guide fixing pipe, and a plurality of solid needles positioned at the other end of the spinneret body and extending out of the spinneret body, wherein the insulating cover surrounds the outside of the solid needles, a liquid supply cavity is arranged in the spinneret body, a liquid inlet pipe communicated with the liquid supply cavity is arranged in the connecting seat, one end of each solid needle extends into the liquid supply cavity, the other end of each solid needle extends out of the spinneret body, and a gap is formed between each solid needle and the spinneret body; a liquid storage cavity is arranged in the liquid guide fixing pipe, and a liquid inlet and a plurality of liquid outlets which are communicated with the liquid inlet pipe of each spinneret one by one are arranged on the cavity wall of the liquid storage cavity;
the fiber receiving system comprises a receiving base cloth, unreeling rollers and winding rollers which are positioned at two ends of the receiving base cloth, a winding roller driving mechanism for driving the winding rollers to move and a lifting driving mechanism for driving the receiving base cloth to move up and down;
the liquid supply system comprises a high-pressure bottle and a liquid storage box, wherein the high-pressure bottle is connected with the liquid storage box through a gas pipe, and the liquid storage box is communicated with a liquid inlet of a liquid guide fixing pipe through a liquid conveying pipe;
the power supply system comprises a high-voltage direct-current power supply, wherein the positive electrode of the high-voltage direct-current power supply is connected with a solid needle in each spinneret through a wire, and the receiving base cloth is grounded; the control system is connected with the control end of the wind-up roll driving mechanism and the lifting driving mechanism.
According to a preferred scheme of the invention, a floating plate sealing ring for driving the solid needle heads to move up and down is arranged in the liquid supply cavity, a plurality of solid needle heads are fixed on the floating plate sealing ring, and when the polymer spinning liquid in the liquid supply cavity is not full, the floating plate sealing ring is contacted with the cavity wall of the liquid supply cavity; when the liquid supply cavity is filled with polymer spinning liquid, the floating plate sealing ring is separated from contact with the cavity wall of the liquid supply cavity. The structure is suitable for the occasion of spinning downwards of the spinneret, and has the advantages that: when the whole electrostatic equipment is in a working state, the liquid supply cavity is filled with polymer spinning liquid, the floating plate sealing ring is separated from contact with the cavity wall of the liquid supply cavity under the action of floating force (the floating force of the floating plate sealing ring is larger than that of the floating plate sealing ring and the solid needle head), and a gap between the solid needle head and the spinneret main body is opened, so that the polymer spinning liquid can flow out through the gap to perform normal spinning operation; when the whole electrostatic equipment is in a non-working state, the supply of the polymer spinning solution in the solution supply cavity is lacking, so that the floating plate sealing ring is contacted with the cavity wall of the solution supply cavity under the action of gravity (the buoyancy of the floating plate sealing ring is smaller than that of the floating plate sealing ring and the solid needle head at the moment), and the gap between the solid needle head and the spinneret main body is sealed and closed, thereby preventing the polymer spinning solution from flowing out of the solution supply cavity to cause pollution and waste.
According to a preferred scheme of the invention, the connecting seat of the spinneret is a screw rod, and the liquid guide fixing pipe is provided with a screw hole matched with the screw rod. The spinneret is connected with the spinneret fixing piece in a mode of matching the screw rod with the screw hole, so that the spinneret has the advantages of convenience in installation and replacement and good sealing performance.
Preferably, the wind-up roller driving mechanism comprises a motor, a driving belt wheel coaxially arranged with the wind-up roller and a driven belt wheel coaxially arranged with the unreeling roller, wherein an output shaft of the motor is connected with the driving belt wheel through a coupler or a conveying belt, and the driven belt wheel is connected with the driving belt wheel through a conveying belt. During operation, the output shaft of the motor rotates to drive the driving belt pulley to rotate, so that on one hand, the driven belt pulley which is coaxial with the driving belt pulley and connected with the driving belt pulley through the conveying belt is driven to rotate, and accordingly the unreeling roller is driven to rotate, and the winding and unwinding tasks of receiving cloth bases are achieved.
Preferably, the gas pipe is provided with a gas flow regulating valve and a pressure gauge. When the device works, the pressure in the liquid storage tank can be controlled by the gas flow regulating valve, when the pressure is large, the flow rate of the polymer spinning solution is large, the liquid supply amount in unit time is large, and when the pressure is small, the flow rate of the polymer spinning solution is small, the liquid supply amount in unit time is small, so that the device can be regulated according to actual demands.
Preferably, the liquid guide fixing pipe is a cylindrical hollow sealing pipe, the inner cavity of the hollow sealing pipe forms the liquid storage cavity, the liquid inlet is arranged on one end face of the hollow sealing pipe, and the liquid outlet is arranged on the cylindrical surface of the hollow sealing pipe. The inner cavity surface of the hollow sealing tube is a cylindrical surface, so that the polymer spinning solution can be converged, and then flows out of a liquid outlet arranged on the cylindrical surface after being converged to the bottom, so that the liquid can flow into the spinneret more smoothly; and the cylindrical hollow sealing tube is convenient for cleaning the inner cavity of the cylindrical hollow sealing tube.
Preferably, the liquid guide fixing tube is a rectangular box, and an inner cavity of the rectangular box forms the liquid storage cavity. The purpose that sets up like this is that the surface of rectangle box is planar structure, can set up the spinneret in horizontal, can set up the spinneret in vertical again to can arrange the quantity and the arrangement mode of spinneret rationally according to actual demand.
Preferably, the spinneret body is a cylinder, and the solid needles are arranged on the spinneret body in a circumferential direction and divided into a plurality of groups in a radial direction.
Preferably, the insulation cover has a hollow cylindrical structure, and an end of the insulation cover is connected to the spinneret body through a screw connection structure.
Preferably, the spinneret body is cylindrical and the solid needles are arranged in an array on the spinneret body.
The working principle of the invention is as follows:
during operation, the high-pressure bottle supplies air to the liquid storage box, so that the liquid storage box is in a high-pressure state, and under the high-pressure state, polymer spinning liquid in the liquid storage box can automatically flow from the liquid storage box to the liquid storage cavity of the liquid guide fixing pipe through the infusion tube, and then flows to the liquid supply cavity of the spinneret through the liquid outlet of the liquid storage cavity to provide polymer spinning liquid for the spinneret in the spinning process.
In each spinneret, because each solid needle head and the spinneret body piece are provided with a gap, polymer spinning liquid in the spinneret liquid supply cavity can reach the needle point of the solid needle head through the gap to form polymer liquid drops, when the regulating voltage reaches the critical spinning voltage, taylor cones appear at the needle point of each solid needle head, the solid needle heads are further stretched into spinning jet flow to form nano fibers, the nano fibers are sprayed onto receiving base cloth, and then the receiving base cloth after spinning is wound through an unwinding roller and a winding roller.
Wherein, because each spinneret is provided with an insulating cover, the electrostatic interference among the spinneret is greatly weakened, and each spinneret forms an independent spinneret unit in the spinneret process; for the inside of each spinning unit, because a plurality of solid needles are arranged on each spinning nozzle, although electrostatic interference exists among the needles, because the number of the solid needles in each spinning nozzle is far smaller than that of the solid needles in the whole electrostatic spinning equipment, the electrostatic repulsive effect among the solid needles in each spinning nozzle is limited, so that the electrostatic interference influence on spinning sprayed by each spinning nozzle is small, and by reasonably setting the number of the spinning nozzles and the arrangement positions of the spinning nozzles, the spinning sprayed by the spinning nozzles is gathered on a receiving base cloth, and a higher-quality electrostatic spinning product can be obtained. Meanwhile, because the internal solid needle heads in each spinneret are needles with common diameters, the arrangement distance between the needle heads can be smaller, and the arrangement form can be flexibly arranged, so that the arrangement requirement of small distance can be met, the specific production process requirement, for example, the production efficiency is higher, the spinning distribution density is higher, and the like.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the solid needle electrostatic spinning device, each spinneret is provided with the insulating cover, so that the problem of electrostatic interference between the spinneret is avoided; while for each spinneret, although there is a problem of electrostatic interference among the plurality of solid needles in the inside of the spinneret, because the number of the solid needles in each spinneret is much smaller than that of the solid needles in the whole electrostatic spinning device, the electrostatic repulsive effect among the solid needles in each spinneret is limited, so that the electrostatic interference influence on the spinning sprayed by each spinneret is smaller, and by reasonably setting the number of the spinneret and the arrangement position of the spinneret, the spinning sprayed by the plurality of the spinneret is collected on the receiving base cloth, and a higher-quality electrostatic spinning product can be obtained. Meanwhile, because the internal solid needle heads in each spinneret are needles with common diameters, the arrangement distance between the needle heads can be smaller, and the arrangement form can be flexibly arranged, so that the arrangement requirement of small distance can be met, the specific production process requirement, for example, the production efficiency is higher, the spinning distribution density is higher, and the like.
2. The solid needle electrostatic spinning equipment provided by the invention can not only avoid the problem of electrostatic repulsion caused by the compact arrangement of the silk needles in the prior art, but also avoid the problem of overlarge space caused by the arrangement of insulators for each spinning needle in the prior art, and simultaneously solve the problem of electrostatic interference and the problem of arrangement density of the spinning needles, thereby obtaining double effects.
3. The solid needle electrostatic spinning equipment is provided with the plurality of spinning nozzles, and the plurality of solid needles are arranged in the spinning nozzles, so that the plurality of solid needles in the spinning nozzles can simultaneously carry out spinning operation during operation, and the spinning yield can be greatly improved.
4. The solid needle electrostatic spinning equipment provided by the invention adopts an air pressure liquid supply mode to provide constant air pressure, the number of needles is not limited, the spinning liquid is uniformly distributed, and the spinning process is stable.
Drawings
Fig. 1 is a schematic structural view of a solid needle 5-1 electrostatic spinning device of the present invention.
Fig. 2 is a schematic structural view of the solid needle 5-1 electrostatic spinning apparatus shown in fig. 1 when the liquid guiding fixing tube is a cylindrical hollow sealing tube.
Fig. 3 is a schematic view of the structure of the spray head in fig. 1.
Fig. 4 is an internal structural view of the sprinkler head of fig. 1.
Fig. 5 is a schematic view of the structure of fig. 1 when the spinneret body is cylindrical and the solid needles are circumferentially arranged on the spinneret body.
Fig. 6 is an internal configuration diagram of the shower head according to embodiment 2.
Fig. 7 is a schematic structural diagram of a liquid guiding fixing tube corresponding to embodiment 3.
FIG. 8 is a schematic view showing the structure of the solid needle spinneret body according to example 4 when the solid needle spinneret body is arranged in an array.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
Referring to fig. 1, the solid needle 5-1 electrostatic spinning device of the invention comprises a spinning system, a fiber receiving system, a liquid supply system, a power supply system and a control system;
referring to fig. 1 to 4, the spinning system includes a plurality of spinning nozzles 5, a liquid guiding fixing pipe 4 for fixing the spinning nozzles 5, and an insulation cover 12 provided on each spinning nozzle 5 for electrostatic isolation of the spinning nozzles 5, the insulation cover 12 has a hollow cylindrical structure, and the end of the insulation cover 12 is connected to the spinning nozzle body 5-2 through a screw connection structure; the spinneret 5 comprises a spinneret body 5-2, a connecting seat 5-3 positioned at one end of the spinneret body 5-2 and used for being connected with a liquid guide fixing pipe 4, and a plurality of solid needles 5-1 positioned at the other end of the spinneret body 5-2 and extending out of the spinneret body 5-2, wherein the insulating cover 12 surrounds the solid needles 5-1, a liquid supply cavity 5-21 is arranged in the spinneret body 5-2, a liquid inlet pipe 5-5 communicated with the liquid supply cavity 5-21 is arranged in the connecting seat 5-3, one end of the solid needle 5-1 extends into the liquid supply cavity 5-21, the other end extends out of the spinneret body 5-2, and a gap 5-22 is arranged between each solid needle 5-1 and the spinneret body 5-2; a liquid storage cavity is arranged in the liquid guide fixing pipe 4, and a liquid inlet and a plurality of liquid outlets which are communicated with the liquid inlet pipes 5-5 of each spinneret 5 one by one are arranged on the cavity wall of the liquid storage cavity; wherein, the connecting seat 5-3 of the spinneret 5 is a screw, the screw is provided with a thread 5-4, and the liquid guide fixing pipe 4 is provided with a screw hole matched with the screw; the spinneret 5 is connected with the liquid guide fixing pipe 4 in a mode of matching the screw rod with the screw hole, so that the spinneret 5 has the advantages of convenience in installation and replacement and good sealing performance.
Referring to fig. 2, the liquid guiding fixing tube 4 is a cylindrical hollow sealing tube, the inner cavity of the hollow sealing tube forms the liquid storage cavity, the liquid inlet is arranged on one end face of the hollow sealing tube, and the liquid outlet is arranged on the cylindrical surface of the hollow sealing tube. The inner cavity surface of the hollow sealing tube is a cylindrical surface, so that the polymer spinning solution can be converged, and then flows out of a liquid outlet arranged on the cylindrical surface after being converged to the bottom, so that the liquid can flow into the spinneret 5 more smoothly; and the cylindrical hollow sealing tube is convenient for cleaning the inner cavity of the cylindrical hollow sealing tube.
Referring to fig. 3 and 5, the spinneret body 5-2 is a cylinder, and the solid needles 5-1 are arranged on the spinneret body 5-2 in a circumferential direction and divided into a plurality of groups in a radial direction.
Referring to fig. 1, the fiber receiving system comprises a receiving base fabric 7, a transmission roller 6 positioned at two ends of the receiving base fabric 7, a wind-up roller driving mechanism for driving the transmission roller 6 to rotate, and a lifting driving mechanism for driving the receiving base fabric 7 to move up and down, wherein the transmission roller comprises an unreeling roller and a wind-up roller, the lifting driving mechanism is composed of a first motor 14 and a supporting rod 13, one end of the supporting rod 13 is connected with the receiving base fabric, and the other end is connected with the first motor 14; the wind-up roller driving mechanism comprises a second motor, a driving belt wheel coaxially arranged with the wind-up roller and a driven belt wheel coaxially arranged with the unreeling roller, wherein an output shaft of the second motor is connected with the driving belt wheel through a coupler or a conveying belt, and the driven belt wheel is connected with the driving belt wheel through a conveying belt. During operation, the output shaft of the second motor rotates to drive the driving belt pulley to rotate, so that on one hand, the driven belt pulley coaxial with the driving belt pulley and connected with the driving belt pulley through the conveying belt is driven to rotate, and accordingly the unreeling roller is driven to rotate, and the reeling and unreeling task of receiving the base cloth 7 is achieved.
Referring to fig. 1, the liquid supply system comprises a high-pressure bottle 11 and a liquid storage box 8, wherein the high-pressure bottle 11 is connected with the liquid storage box 8 through a gas pipe, and the liquid storage box 8 is communicated with a liquid inlet of a liquid guide fixing pipe 4 through a liquid conveying pipe; the gas pipe is also provided with a gas flow regulating valve 10 and a pressure gauge 9. When the device works, the pressure in the liquid storage box 8 can be controlled by the gas flow regulating valve 10, when the pressure is high, the flow rate of the polymer spinning solution is high, the liquid supply amount in unit time is high, and when the pressure is low, the flow rate of the polymer spinning solution is low, the liquid supply amount in unit time is low, so that the device can be regulated according to actual requirements.
Referring to fig. 1, the power supply system comprises a high-voltage direct current power supply, wherein a positive electrode 1 of the high-voltage direct current power supply is connected with a solid needle 5-1 in each spinneret 5 through a wire 3, and a receiving base cloth 7 is connected with a grounding electrode 2; the control system is connected with the control end of the wind-up roll driving mechanism and the lifting driving mechanism.
The working principle of the invention is as follows:
during operation, the high-pressure bottle 11 supplies air into the liquid storage box 8, so that the liquid storage box 8 is in a high-pressure state, under the high-pressure state, the polymer spinning liquid in the liquid storage box 8 can automatically flow into the liquid storage cavity of the liquid guide fixing pipe 4 from the liquid storage box 8 through the infusion tube, and then flows into the liquid supply cavity 5-21 of the spinneret 5 through the liquid outlet of the liquid storage cavity to provide the polymer spinning liquid for the spinneret 5 in the spinning process.
In each spinneret 5, because each solid needle 5-1 and the spinneret body 5-2 are provided with a gap 5-22, the polymer spinning solution in the solution supply cavity 5-21 of the spinneret 5 can reach the needle point of the solid needle 5-1 through the gap 5-22 to form polymer liquid drops, when the voltage reaches the critical spinning voltage, the needle point of each solid needle 5-1 is provided with a taylor cone and is further stretched into spinning jet flow to form nano fibers, the nano fibers are sprayed onto the receiving base cloth 7, and then the spun receiving base cloth 7 is wound by an unwinding roller and a winding roller.
Wherein, because of the insulating cover 12 arranged on each spinneret 5, the electrostatic interference among the spinnerets 5 is greatly weakened, and each spinneret 5 forms an independent spinning unit in the spinning process; in the interior of each spinneret unit, since the plurality of solid needles 5-1 are arranged on each spinneret 5, although electrostatic interference exists among the needles, since the number of the solid needles 5-1 in each spinneret 5 is much smaller than that of the solid needles 5-1 in the whole electrostatic spinning device, the electrostatic repulsive effect among the solid needles 5-1 in each spinneret 5 is limited, so that the effect of electrostatic interference on the spinning sprayed by each spinneret 5 is smaller, and by reasonably setting the number of the spinnerets 5 and the arrangement positions of the spinnerets 5, the spinning sprayed by the spinnerets 5 is collected on the receiving base cloth 7, and a higher-quality electrostatic spinning product can be obtained. Meanwhile, since the inner solid needle 5-1 in each spinneret 5 is a needle with a common diameter, the arrangement distance between the needles can be smaller, and the arrangement form can be flexibly set, so that the arrangement requirement of small distance can be met, and the specific production process requirements, such as higher production efficiency, higher spinning distribution density and the like, can be met.
Example 2
Referring to fig. 6, the difference between this embodiment and embodiment 1 is that a floating plate seal ring 5-23 for driving the solid needles 5-1 to move up and down is provided in the liquid supply chamber 5-21, a plurality of solid needles 5-1 are fixed on the floating plate seal ring 5-23, and when the polymer spinning liquid in the liquid supply chamber 5-21 is not filled, the floating plate seal ring 5-23 is in contact with the chamber wall of the liquid supply chamber 5-21; when the liquid supply cavity 5-21 is filled with the polymer spinning liquid, the floating plate sealing ring 5-23 is separated from contact with the cavity wall of the liquid supply cavity 5-21. The structure is suitable for the occasion that the spinneret 5 sprays the silk downwards, and its benefit lies in: when the whole electrostatic equipment is in a working state, the liquid supply cavity 5-21 is filled with polymer spinning liquid, the floating plate sealing ring 5-23 is separated from contact with the cavity wall of the liquid supply cavity 5-21 under the action of buoyancy force (the buoyancy force of the floating plate sealing ring 5-23 is larger than that of the floating plate sealing ring 5-23 and the solid needle head 5-1), and a gap 5-22 between the solid needle head 5-1 and the spinneret main body 5-2 is opened, so that the polymer spinning liquid can flow out through the gap 5-22 to perform normal spinning operation; when the whole electrostatic equipment is in a non-working state, the supply of the polymer spinning solution in the solution supply cavity 5-21 is lacking, so that the floating plate sealing ring 5-23 is contacted with the cavity wall of the solution supply cavity 5-21 under the action of gravity (at the moment, the buoyancy of the floating plate sealing ring 5-23 is smaller than that of the floating plate sealing ring 5-23 and the solid needle head 5-1), and the gap 5-22 between the solid needle head 5-1 and the spinneret main body 5-2 is sealed and closed, thereby preventing the polymer spinning solution from flowing out of the solution supply cavity 5-21 to cause pollution waste. The necessity of this arrangement is that: in the embodiment 1, the spinning direction is upward, and there is no leakage of the polymer spinning solution, but in the embodiment, the spinning direction is downward, specifically, the liquid guiding fixing tube is disposed above, the receiving base is disposed below, the spinneret is disposed at the bottom of the liquid guiding fixing tube, and the spinning direction of the spinneret is downward, so that even in the non-working state, the liquid in the liquid storage cavity of the liquid guiding fixing tube still flows out through the gap 5-22 between the solid needle 5-1 and the spinneret main body 5-2.
Other embodiments than the above described embodiment of the present embodiment are described with reference to embodiment 1.
Example 3
Referring to fig. 7, this embodiment is different from embodiment 1 in that the liquid guiding fixing tube 4 is a rectangular box, and the inner cavity of the rectangular box forms the liquid storage cavity. The purpose of setting like this is that the surface of rectangle box is planar structure, can set up spinneret 5 in horizontal, can set up spinneret 5 in vertical again to can arrange the quantity and the arrangement mode of spinneret 5 rationally according to actual demand.
Other embodiments than the above described embodiment of the present embodiment are described with reference to embodiment 1.
Example 4
Referring to fig. 8, this embodiment is different from embodiment 1 in that the solid needles 5-1 are arranged in an array on the spinneret body 5-2.
Other embodiments than the above described embodiment of the present embodiment are described with reference to embodiment 1.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather as various changes, modifications, substitutions, combinations, and simplifications which may be made therein without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. The solid needle electrostatic spinning equipment is characterized by comprising a spinning system, a fiber receiving system, a liquid supply system, a power supply system and a control system;
the spinning system comprises a plurality of spinning nozzles, a liquid guide fixing pipe for fixing the spinning nozzles and an insulating cover arranged on each spinning nozzle and used for carrying out electrostatic isolation on the spinning nozzles; the spinneret comprises a spinneret body, a connecting seat positioned at one end of the spinneret body and used for being connected with a liquid guide fixing pipe, and a plurality of solid needles positioned at the other end of the spinneret body and extending out of the spinneret body, wherein the insulating cover surrounds the outside of the solid needles, a liquid supply cavity is arranged in the spinneret body, a liquid inlet pipe communicated with the liquid supply cavity is arranged in the connecting seat, one end of each solid needle extends into the liquid supply cavity, the other end of each solid needle extends out of the spinneret body, and a gap is formed between each solid needle and the spinneret body; a liquid storage cavity is arranged in the liquid guide fixing pipe, and a liquid inlet and a plurality of liquid outlets which are communicated with the liquid inlet pipe of each spinneret one by one are arranged on the cavity wall of the liquid storage cavity;
the fiber receiving system comprises a receiving base cloth, unreeling rollers and winding rollers which are positioned at two ends of the receiving base cloth, a winding roller driving mechanism for driving the winding rollers to move and a lifting driving mechanism for driving the receiving base cloth to move up and down;
the liquid supply system comprises a high-pressure bottle and a liquid storage box, wherein the high-pressure bottle is connected with the liquid storage box through a gas pipe, and the liquid storage box is communicated with a liquid inlet of a liquid guide fixing pipe through a liquid conveying pipe;
the power supply system comprises a high-voltage direct-current power supply, the positive electrode of the high-voltage direct-current power supply is connected with a solid needle head on each spinning nozzle through a wire, and the receiving base cloth is grounded; the control system is connected with the control end of the wind-up roll driving mechanism and the lifting driving mechanism;
a floating plate sealing ring used for driving the solid needle heads to move up and down is arranged in the liquid supply cavity, a plurality of solid needle heads are fixed on the floating plate sealing ring, and when the polymer spinning liquid in the liquid supply cavity is not full, the floating plate sealing ring is contacted with the cavity wall of the liquid supply cavity; when the liquid supply cavity is filled with polymer spinning liquid, the floating plate sealing ring is separated from contact with the cavity wall of the liquid supply cavity.
2. The solid needle electrostatic spinning device of claim 1, wherein the connection seat of the spinneret is a screw, and the liquid guiding fixing tube is provided with a screw hole matched with the screw.
3. The solid needle electrostatic spinning apparatus of any one of claims 1-2, wherein a gas flow regulating valve and a pressure gauge are provided on the gas pipe.
4. The solid needle electrostatic spinning apparatus according to any one of claims 1 to 2, wherein the wind-up roller driving mechanism comprises a motor, a driving pulley coaxially arranged with the wind-up roller, and a driven pulley coaxially arranged with the unreeling roller, wherein an output shaft of the motor is connected with the driving pulley through a coupling or a conveyor belt, and the driven pulley is connected with the driving pulley through a conveyor belt.
5. The solid needle electrostatic spinning device of claim 4, wherein the liquid guide fixing tube is a cylindrical hollow sealing tube, the inner cavity of the hollow sealing tube forms the liquid storage cavity, the liquid inlet is arranged on one end face of the hollow sealing tube, and the liquid outlet is arranged on the cylindrical surface of the hollow sealing tube.
6. The solid needle electrospinning apparatus of claim 1, wherein the insulating cap is of hollow cylindrical configuration, and the ends of the insulating cap are connected to the spinneret body by a threaded connection.
7. The solid needle electrospinning apparatus of claim 4, wherein the liquid guide fixing tube is a rectangular box, and the inner cavity of the rectangular box forms the liquid storage cavity.
8. The solid needle electrospinning apparatus of claim 1, wherein the spinneret body is cylindrical, and the solid needles are arranged circumferentially on the spinneret body and are divided into a plurality of groups in the radial direction.
9. The solid needle electrospinning apparatus of claim 1, wherein the spinneret body is cylindrical and the solid needles are arranged in an array on the spinneret body.
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| CN108034995B true CN108034995B (en) | 2023-09-26 |
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| JP7242353B2 (en) * | 2019-03-12 | 2023-03-20 | 株式会社東芝 | Electrospinning head and electrospinning device |
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| CN111118620B (en) * | 2019-12-30 | 2021-12-21 | 东华大学 | Saturated micro-liquid-level solid needle array spinning device and using method thereof |
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| CN114703553B (en) * | 2022-03-28 | 2023-03-21 | 青岛中科凯尔科技有限公司 | Solution jet spinning device for forming nano fibers |
| CN114717669B (en) * | 2022-03-30 | 2023-05-26 | 南通纺织丝绸产业技术研究院 | Nanofiber yarn and continuous yarn forming method thereof |
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