CN208071855U - A kind of hand-held melt electrostatic spinning preparation facilities - Google Patents

Abstract

The utility model discloses a hand-held melt electrostatic spinning preparation device, which mainly includes a safety cover, an end cover, a fastening screw, a shell, a support plate, a roller, thermal insulation cotton, an isolation plate, a fan, a resistance heating wire, and a vent hole , Ventilation tube, roller, miniature high-voltage electrostatic generator, wire hole, electrode joint, feeding tube, needle, vent hole, metal gasket, venting tube hole, feeding tube hole, tapered hole, etc. The device uses silk material to feed continuously, and the air heated by the resistance heating wire heats and melts the material; the needle connects the high voltage and the grounded receiving plate to form an electric field; the hot air after heat transfer flows from the needle and the tapered hole of the end cover It is discharged between the slits, and the fibers are stretched twice. This device simplifies the melt electrospinning preparation device, making it miniaturized, lightweight, and portable, making fiber preparation more convenient and quicker, and can be used for small batches in laboratory applications, household use, clinical medical use, and teaching and demonstration teaching aids. Fiber preparation.

Description

A hand-held melt electrospinning preparation device

technical field

The utility model relates to a hand-held melt electrostatic spinning preparation device, which belongs to the field of electrostatic spinning.

Background technique

At present, the electrospinning method is recognized as the simplest and most efficient method for preparing micro-nano fibers. Compared with other methods, the electrospinning method has the advantages of wide source of raw materials, low spinning cost, and large-scale preparation. Fields such as battery separators and biomedicine have shown great application potential, which has attracted widespread attention from researchers.

Existing research and industrial applications have produced a lot of innovations around electrospinning batch devices, but there are few miniature and small-scale electrospinning devices that are portable, small in size and easy to operate. However, such small devices have great potential in laboratory applications, home use, clinical medical use, and as teaching and demonstration teaching aids. Chinese patent (201720057770.9) is a new type of portable electrospinning device. Although the electrospinning device has been improved in portability, the device can only realize the solution electrospinning method, but cannot realize the polymer melt. Because polymer melt needs to be heated and run at high temperature, it means that complex heating system, raw material supply system, heat insulation and insulation system are required, which poses a great challenge to the portable design. Therefore, seeking to design a portable, small-volume and easy-to-operate small melt electrospinning preparation device has broad application prospects and research value.

In view of the above problems, the utility model proposes a hand-held melt electrospinning preparation device, which uses high-temperature and high-pressure gas to heat and melt materials and rollers to continuously convey silk materials, replacing the traditional method of melting and conveying materials by screw extruders. In addition, the collection device is simplified, the melt electrospinning equipment is miniaturized, lightweight, and portable, and the fiber preparation is more convenient and quicker. It can be used for laboratory applications, household use, clinical medical use, and small-batch fiber preparation for teaching and demonstration teaching aids.

Utility model content

The utility model proposes a hand-held melt electrostatic spinning preparation device, which uses high-temperature and high-pressure gas to heat and melt materials and roller pairs to continuously convey silk materials instead of the traditional method of melting and conveying materials by screw extruders, and further utilizes heat transfer The completed gas refines the jet, simplifies the collection device, and makes the melt electrospinning equipment miniaturized, lightweight, and portable, enabling continuous preparation of micro-nano fibers. It realizes the portability of the melt electrospinning nanofiber preparation device, satisfies the instant use of thermoplastic materials, and better promotes the application and development of nanofibers.

The technical solution to achieve the above purpose is: a hand-held melt electrospinning preparation device, which mainly includes a safety cover, an end cover, a fastening screw, a shell, a support plate, a roller, thermal insulation cotton, a partition, a heating chamber shell, and a fan , Resistance heating wire, air hole, air pipe, roller, miniature high-voltage electrostatic generator, wire hole, electrode joint, feeding tube, needle, exhaust hole, metal gasket, tapered hole, etc. A drum is placed on the upper part of the shell, and the wire material is wound on the drum; the fan, the shell of the heating chamber, the partition and the resistance heating wire are arranged coaxially from right to left to form the heating chamber. One end of the ventilation pipe is connected to the heating chamber, and the other end is connected to the metal gasket and the end cover. The cavity between them, and the ventilation pipe is insulated with thermal insulation cotton. There are many ventilation pipes and are evenly distributed along the circumferential direction; two rollers driven by a motor with adjustable speed move in opposite directions to form a roller pair. The centerline of the gap between the roller pair and the feeding pipe Arranged coaxially, the feeding tube is located on the left side of the roller pair, with a distance of 1-3cm. The silk material passes through the shell and insulation cotton and is transported into the feeding tube through the roller pair. The feeding tube is threaded with the needle. The inner diameter of the feeding tube is slightly larger than The diameter of the wire material; the ventilation pipe and the feeding pipe are fixed circumferentially by the support plate, and the stepped holes on the bottom of the shell and the partition are fixed axially; the safety cover is installed at the end cover, and there is a hole in the center of the end cover, and the micro high-voltage static electricity occurs The device is connected to the needle through the electrode connector, end cap, metal gasket and wire, so that the needle carries high-voltage static electricity and forms an electric field with the grounded receiving plate inside the safety cover. The end cap, metal gasket and the shell are connected by fastening screws .

The utility model is a hand-held electrospinning preparation device for melt, which squeezes and continuously conveys silk materials through the opposite movement of the rollers, and the rotating speed of the rollers is adjustable to meet the control of different feeding volumes; and the airflow is driven by a fan to make large Part of the air flow enters the heating chamber and flows through the resistance heating wire to make the gas temperature meet the requirements, and the temperature is controllable to meet the melting requirements of different materials, and it is continuously and stably supplied to the cavity between the end cover and the metal gasket. The heat transfer between the needle and the needle melts the material at the junction of the needle and the feeding pipe, replacing the traditional method of melting and conveying the material by the screw extruder, effectively reducing the volume and weight of the device, and ensuring the portability of the device.

The utility model is a hand-held melt electrospinning preparation device. The hot air after heat transfer is discharged through the tapered hole at the bottom of the end cover and the slit of the needle, and the tapered hole at the bottom of the end cover is helpful for air flow. Consistent with the direction of the fiber, the ratio of the area of the air outlet of the tapered hole to the area of the vent hole is (1/2, 1), that is, greater than 1/2 to less than 1, or add an auxiliary vent hole at the bottom of the end cover to add its area and The ratio of the area of the upper tapered hole to the area of the ventilation hole is 1/2-1, that is, greater than 1/2 to less than 1. The airflow at the air outlet of the tapered hole has a drafting effect on the filaments while avoiding airflow retention, which is conducive to the regular collection of fibers And further refinement of fiber diameter.

The utility model is a hand-held electrospinning preparation device for melt. There is a space of 5-20 mm between the shell of the heating chamber and the shell, so that the cold air that does not enter the heating chamber cools the shell of the device, so as to avoid scalding the operator when the shell temperature is too high. , improve security.

The utility model is a hand-held melt electrospinning preparation device, wherein the end cap, the metal gasket and the needle are made of conductive and heat-conducting materials, and the materials of the shell, the material pipe and the vent pipe require an insulating material that does not deform at a high temperature of up to 350°C. Specifically, it may be a glass tube, a ceramic tube, or polyetheretherketone.

The utility model is a hand-held melt electrospinning preparation device. A detachable safety cover is installed at the end cover, and the safety cover is evenly distributed with oblique air holes in the circumferential direction, which is used for external cold air and hot air ejected from the hand-held device. The exchange makes the hot air flow reach a cooling state before reaching the fiber receiving plane, avoiding the scalding of the receiving plane, and the gas will not form a swirling flow in the safety cover because it cannot be discharged, which will affect the regular collection of fibers.

The utility model is a hand-held melt electrostatic spinning preparation device. The device adopts a miniature high-voltage electrostatic generator, or the electrostatic generator is externally installed, and all electric energy is supplied by an external power supply or a fixed socket to reduce volume and weight. , improve portability.

The utility model is a hand-held electrospinning preparation device for melt, which uses silk material to feed, and the silk material is wound on the drum, and the roller driven by the motor continuously feeds it into the feeding pipe; the gas enters the device by the fan, and adopts The fan drives the airflow, a small amount of gas flows into the gap between the partition and the shell, and is discharged from the vent hole. The rest of the gas is blown into the heating chamber by the fan-driven airflow, passes through the resistance heating wire, and is continuously and stably supplied to the end cover and the ventilation pipe. In the cavity between the metal gaskets, contact with the needle to transfer heat, so that the material at the junction of the needle and the feeding pipe melts, and the gas after heat transfer is ejected at a certain pressure from the slit between the tapered hole of the end cover and the needle. ;The needle carries high-voltage static electricity, and forms an electric field with the grounded receiving device in the safety cover. Under the action of the electric field force and the double action of the airflow, the fibers are stretched and refined, and are neatly collected on the collecting plate.

Compared with the prior art, the utility model has the following advantages:

1. The device of this utility model simplifies the preparation process and device of melt electrostatic nanofibers, uses high-temperature and high-pressure gas to heat and melt the material, and further uses the gas after heat transfer to refine the jet flow, making the equipment miniaturized, lightweight and portable , to meet the ready-to-spin of thermoplastic materials, and the method of preparing fibers is faster.

2. The hot air temperature of the utility model device is adjustable, and the motor speed of the driving roller is adjustable, which can meet the melting requirements of different materials and match different feeding speeds, making the device more widely used.

3. A detachable safety cover is installed on the end cover of the device of the utility model, and the safety cover is evenly distributed with exhaust holes in the circumferential direction, which is convenient for gas discharge, improves safety, and is conducive to the regular collection of fibers.

Description of drawings

Fig. 1 is a structural schematic diagram of a hand-held melt electrospinning preparation device of the present invention.

Fig. 2 is a rotated enlarged view of the molten discharge part of the structure shown in Fig. 1 .

Fig. 3 is an enlarged view of the A-A section of the structure shown in Fig. 1 .

In the figure: 1-safety cover; 2-end cover; 3-fastening screw; 4-shell; 5-support plate; 6-roller; 7-insulation cotton; Fan; 11-resistance heating wire; 12-ventilation hole; 13-breather tube; 14-roller; 15-miniature high-voltage electrostatic generator; 16-wire hole; 17-electrode connector; 18-feeding tube; 19-needle; 20-exhaust hole; 21-metal gasket; 22-tapered hole.

Detailed ways

The utility model is a hand-held melt electrospinning preparation device, as shown in Figure 1, which mainly includes: a safety cover 1, an end cover 2, a fastening screw 3, a shell 4, a support plate 5, a drum 6, and thermal insulation cotton 7. Partition plate 8, heating chamber shell 9, fan 10, resistance heating wire 11, air hole 12, air pipe 13, roller 14, miniature high-voltage electrostatic generator 15, wire hole 16, electrode joint 17, feeding pipe 18, Needle 19, vent hole 20 and metal spacer 21. This device utilizes silk feeding, and the silk is wound on the drum 6, and two rollers 14 form a roller pair to squeeze the silk and send it continuously into the feeding pipe 18, wherein the rollers 14 are connected to the motor, and the motor speed is adjustable, such as As shown in Fig. 3; the inner diameter of the feed pipe 18 is slightly larger than the diameter of the wire material, so as to avoid bending and folding of the wire material in the feed pipe 18; the gas is brought into the device by the fan 10, and the fan 10 is used to drive the air flow, and a small amount of gas flows into the shell of the heating chamber 9 and the shell 4 are discharged from the vent hole 12 to accelerate the cooling of the device and avoid excessive temperature of the shell; most of the remaining gas is blown into the heating chamber by the airflow driven by the fan 10, and passes through the resistance heating wire 11 to make the gas temperature reach It is required that the air pipe 13 is continuously and stably supplied to the cavity between the end cap 2 and the metal gasket 21, and the air pipe 13 is insulated with insulation cotton 7 to reduce heat loss and make the hot air fully contact with the needle 19 Heat transfer, so that the silk material at the junction of the feed pipe 18 and the needle 19 is melted, wherein the feed pipe 18 is threadedly connected with the needle 19; the ventilation pipe 13 and the feed pipe 18 are circumferentially fixed by the support plate 5, and the bottom of the shell 4 and the partition 8 The stepped hole is fixed axially; the miniature high-voltage electrostatic generator 15 is connected to the needle head 19 through the electrode joint 17, the metal end cap 2, the metal gasket 21 and the wire, so that the needle head 19 carries high-voltage static electricity and is connected to the grounding receiving device An electric field is formed in the safety cover 1 , and the thinned fibers are stretched by electric field force, wherein the end cap 2 , the metal gasket 21 and the shell 4 are connected by fastening screws 3 .

The utility model is a hand-held melt electrospinning preparation device. The hot air after heat transfer is discharged through the tapered hole 22 at the bottom of the end cover 2 and the slit of the needle 19, and the tapered hole 22 at the bottom of the end cover 2 , as shown in Figure 2, helps the airflow to be consistent with the direction of the fiber, and is conducive to further refinement of the fiber diameter.

The utility model is a hand-held melt electrospinning preparation device. A detachable safety cover 1 is installed at 2 end caps. As shown in FIG. The air vents 20 are evenly distributed in the circumferential direction of the safety cover, which is convenient for gas discharge, improves safety, and is conducive to the regular collection of fibers.

The utility model is a method for using a hand-held melt electrostatic spinning preparation device. The air heating temperature is set to 300°C, the material of the silk material is PLA, the linear speed of the roller is 5mm/min, and the external receiving surface is grounded and 6cm away from the needle. . First turn on the fan and resistance heating wire to preheat for five minutes, then turn on the roller motor to ensure that the device is in a continuous feeding state. After the filament is heated into a molten material, the micro high-voltage electrostatic generator is turned on. Under the action of the high-voltage electrostatic field, a jet is formed at the needle and stretched and refined to form ultra-fine fibers, which can be collected neatly on the receiving plate.

Claims (6)

1. a kind of hand-held melt electrostatic spinning preparation facilities, it is characterised in that：Mainly include safety guard, end cap, trip bolt, It is shell, support plate, roller, heat-preservation cotton, partition board, heating chamber enclosure, fan, resistance heating wire, venthole, snorkel, idler wheel, micro- Type HV generator, threading hole, electrode contact, feed pipe, syringe needle, gas vent and metal gasket etc., shell upper are placed Roller, silk are wrapped on roller；Coaxially arranged constitute adds from right to left by fan, heating chamber enclosure, partition board and resistance heating wire Hot chamber, snorkel one end connect heating chamber, and one end connects the cavity between metal gasket and end cap, and the additional heat-preservation cotton of snorkel Heat-insulation and heat-preservation, snorkel have more and are evenly distributed；Two constitute rolling by the motor driving adjustable idler wheel reverse motions of rotating speed Wheel pair, pair of rollers slit centers line and feed pipe are coaxially arranged, and feed pipe is located at the left side of pair of rollers, and silk passes through shell and guarantor Warm cotton is conveyed into feed pipe via pair of rollers, and feed pipe is threadedly coupled with syringe needle, and the internal diameter of the feed pipe is straight slightly larger than silk Diameter；Snorkel and feed pipe carry out circumferential direction by support plate and fix, and the stepped hole of outer casing bottom and partition board is to its axial restraint；Safety Cover is mounted at end cap, there is hole at end cap central, high-pressure mini electrostatic generator by electrode contact, end cap, metal gasket and Conducting wire is connect with syringe needle, so that syringe needle is carried high-pressure electrostatic, electric field, the end are formed inside safety guard with the receiver sheet of ground connection Lid, metal gasket and shell are connected by trip bolt；End cap, metal gasket and syringe needle are conductive heat conducting material, shell, expects pipe It is insulating materials with ventilation tube material.

2. a kind of hand-held melt electrostatic spinning preparation facilities according to claim 1, it is characterised in that：End cap bottom Hole is bellmouth, and the area of bellmouth gas outlet is with ventilation hole area and than being more than 1/2 to less than 1.

3. a kind of hand-held melt electrostatic spinning preparation facilities according to claim 1, it is characterised in that：End cap bottom Hole is bellmouth, adds its area of auxiliary exhaust ports and plus taper hole area with ventilation hole area and than being more than 1/ in end cap bottom 2 to less than 1.

4. a kind of hand-held melt electrostatic spinning preparation facilities according to claim 1, it is characterised in that：Heat chamber enclosure There are the spaces 5-20mm between shell.

5. a kind of hand-held melt electrostatic spinning preparation facilities according to claim 1, it is characterised in that：Shell, expects pipe It is glass tube, ceramic tube or polyether-ether-ketone with ventilation tube material.

6. a kind of hand-held melt electrostatic spinning preparation facilities according to claim 1, it is characterised in that：Safety guard is circumferential Uniformly distributed oblique stomata.