CN104264240B - A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine - Google Patents
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine Download PDFInfo
- Publication number
- CN104264240B CN104264240B CN201410499296.6A CN201410499296A CN104264240B CN 104264240 B CN104264240 B CN 104264240B CN 201410499296 A CN201410499296 A CN 201410499296A CN 104264240 B CN104264240 B CN 104264240B
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- plate
- bracket
- installing
- stand
- track
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- Expired - Fee Related
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Classifications
-
- 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
-
- 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
-
- 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)
- Electrostatic Spraying Apparatus (AREA)
- Spray Control Apparatus (AREA)
Abstract
The present invention relates to a kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, including experimental operation table, injection equipment and receiving mechanism, also include spray angle governor motion, described injection equipment is made up of horizontal level regulation unit and spraying canister；Described spray angle governor motion is made up of installing rack, bracket, regulation stand and angular adjustment handwheel, the front end of bracket is arranged on installing rack, on the base plate of bracket, injection equipment is installed, lateral symmetry in bracket is provided with regulation stand, being provided with on the biside plate of bracket and regulate the gear that in stand, arc adjustment hole is meshed, this gear realizes the movement in arc adjustment hole by angular adjustment handwheel installed upper outside it；Described receiving mechanism is made up of receiving roll and reception plate.The present invention have eject position and adjustable angle, the blasting materials of different physical characteristics can be applicable to, experimental cost is low, be beneficial to the science layout of laboratory, receive various informative advantage.
Description
Technical field
The invention belongs to packaging material field of experiment equipment, particularly a kind of multi-functional integrated type experiment
Room special-purpose electrostatic spinning-drawing machine.
Background technology
Along with the fast development of packaging material research, monodimension nanometer material rely on its surface area big and
The features such as function admirable, become the study hotspot in present material field.And as making 1-dimention nano
The device electrostatic spinning machine of material, becomes the popular object of experimentation especially.
Electrostatic spinning machine generally by DC high-voltage power supply, iron stand, collection nano wire receiving roll with
And the needle tubing equipped with solution is constituted.Its main operation principle is, by material to be made with high
Molecular vehicle is made into a certain proportion of solution, and due to the characteristic of macromolecule self, macromolecular solution leads to
Often comparing thickness, the coefficient of viscosity is bigger, and therefore solution is not easy flowing.The solution dress that will prepare
Entering in syringe, syringe is obliquely or vertically placed, under the promotion of syringe inner carrier, and the solution of thickness
Form hemispherical drop, owing to it has certain concentration, so drop will not drip.At drop
And plus high voltage electric field between receiving roll, under the effect of electrostatic force, spray nano-filaments, dry
Air makes solution evaporation, and obtained nano-filaments is collected by receiving roll becomes nano material.
Existing electrostatic spinning machine structure, function are the most single, there is also following weak point: 1.
The installation site of syringe and angle can not arbitrarily regulate, and cause eject position and the angle of solution in syringe
Spend non-adjustable so that it can not meet the injection needs of different viscosities solution, and the scope of application is less,
In order to meet experiment needs, laboratory domestic demand prepares the electrostatic spinning machine of various different sizes, not only
Add experimental cost but also be unfavorable for the science layout of laboratory；2. it is used for receiving injection in syringe
The receiving portion of the nano-filaments gone out is shaped with receiving roll one form, receives form the most single.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of design science rationally,
Eject position and adjustable angle, the blasting materials of different physical characteristics, experimental cost can be applicable to
Low, be beneficial to the science layout of laboratory, to receive various informative multi-functional integrated type laboratory special
Electrostatic spinning machine.
The present invention solves it and technical problem is that and take techniques below scheme to realize:
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, including experimental operation table, installation
Injection equipment on experimental operation table and receiving mechanism, it is characterised in that: on experimental operation table
Being also equipped with spray angle governor motion, described injection equipment is by horizontal level regulation unit and spray
Shooting cylinder is constituted；Described spray angle governor motion by installing rack, bracket, regulation stand and
Angular adjustment handwheel is constituted, and the front end of bracket is rotatably installed on installing rack, bracket
Injection equipment is installed on base plate, the both sides experimental operation table of bracket is symmetrically installed with tune
Joint stand, is symmetrically installed with on the biside plate of bracket and regulates arc adjustment hole phase in stand
Meshed gears, this gear realizes regulating at arc by angular adjustment handwheel installed upper outside it
Movement in hole；Described receiving mechanism is made up of receiving roll and reception plate, and described receiving roll is led to
Crossing electric machine rotation to be arranged on the installing rack installing bracket, described reception plate upset is installed on
The front end of receiving roll.
And, described horizontal level regulation unit is by moving forward and backward track, bottom mounting plate, front
Rear adjusting handle, move left and right track, top installing plate, spraying canister installing rack, piston pushing assisted plate,
Pushing assisted plate track, motor and travel switch are constituted, before being provided with on the base plate of described bracket
Rear moving track, is slidably fitted with bottom mounting plate, at bottom mounting plate on movable track
On be fixed with adjustment seat, on described bracket base plate before and after the rear end of moving track be fixed with spiral shell
Shaft bar, is coated with screw rod, on the rear portion screw rod of screw bracket in adjustment seat with screw bracket
Being fixed with before and after's adjusting handle, described bottom mounting plate is existed by adjusting handle adjusting screw rod front and back
Indent in adjustment seat moves before and after realizing on movable track, bottom mounting plate upper
Side is provided with and moves left and right track, is provided with on the both ends bottom mounting plate move left and right track
Travel switch, is provided with top installing plate, top installing plate moving left and right to move above track
Driven by motor gear transmission and move on top installing plate screw rod bottom it, install on top
The middle part of plate is provided with the spraying canister installing rack installing spraying canister, on the both sides of spraying canister installing rack
Pushing assisted plate track is installed on portion's installing plate, the rear portion pushing assisted plate track of spraying canister is provided with by
Motor-driven piston pushing assisted plate.
And, described reception plate is by front support stand, rear support stand, reception board mounting stand, installation
Plate, reception plate body, track, motor and travel switch are constituted, at described spray angle governor motion
The rear end of installing rack is provided with rear support stand, in the front end of described spray angle governor motion installing rack
Reception board mounting stand is installed, in the front end receiving board mounting stand, front support stand is installed, receiving
It is rotatablely equipped with installing plate on board mounting stand, the upper surface of installing plate is provided with by motor gear
The reception plate body that can move forward and backward in orbit of transmission, reception plate body is taken by installing plate and is contained in
On front support stand or on rear support stand, described travel switch is installed on the installing plate of rail end.
And, described spraying canister is 2.
And, in the leading section of two described spraying canisters, mixing head being installed, this mixing head is by mixing
Close chamber, spraying canister installing port and ejector pin installing port to constitute, in the rear end face lateral symmetry of hybrid chamber
It is provided with the spraying canister installing port installing spraying canister, is provided with in the front end face centre position of hybrid chamber
The ejector pin installing port of ejector pin is installed.
And, the biside plate of described bracket is provided with horizontal scale chi.
And, the arc adjustment hole of described regulation stand is provided with angle graduated scale.
And, have one in the outer ring of described regulation stand arc adjustment hole relative with arc adjustment hole
The locking hole answered, is coated with bolt in locking hole, one end of bolt is connected with the side plate of bracket,
The other end of bolt is fixedly mounted with pinch grip.
And, between two described regulation stands, tie-beam is installed.
Advantages of the present invention and good effect be:
1, this multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, regulates unit by horizontal level
Setting, it is achieved that injection equipment adjustment the most all around；Pass through spray angle
The setting of governor motion, it is achieved in the regulation of injection equipment in the vertical direction angle；By multiple
The setting of reception mode receiving mechanism, meets different experiment demands.During experiment, can be according to solution
The characteristic such as viscosity, select various position and the injection of mode, reception state, it is achieved that at one
Just can complete the electrostatic spinning experiment of multiple solution on machine, reduce experimental cost, be beneficial to experiment
The science layout of room, the industrialized production for monodimension nanometer material is made that prominent contribution.
2, this multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, by before two spraying canisters
Mixing head is installed in end, and this mixing head can spray after being mixed by the solution in two spraying canisters,
Enrich experiment.
3, this multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, by the both sides in bracket
It is respectively provided with horizontal scale chi and angle graduated scale on plate and on the arc adjustment hole of regulation stand,
The data making acquisition are more accurate.
4, this multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, by arranging in regulation stand
The pinch grip of fastening adjustment bracket, this pinch grip is able to ensure that bracket is firmly fixed to
In regulation stand, it is ensured that the stability of experiment.
5, this multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, by between two regulation stands
Installing tie-beam, this tie-beam avoids the problem that regulation stand tilts because of long-term stress, deforms,
Ensure the normal use of this machine.
6, present configuration design science is reasonable, has eject position and adjustable angle, can be suitable for
Blasting materials, experimental cost in different physical characteristics be low, be beneficial to the science layout of laboratory, connect
Receive various informative advantage, be that a kind of multi-functional integrated type laboratory with higher innovation is special
Electrostatic spinning machine.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the top view of the present invention；
Fig. 3 is the A portion enlarged drawing of Fig. 2；
Fig. 4 is the structural representation that the present invention omits receiving mechanism；
Fig. 5 is the structural representation of inventive receiver structure；
Fig. 6 is the structural representation that the present invention receives plate；
Fig. 7 is the structural representation that spraying canister of the present invention combines with mixing head；
Fig. 8 is the use state diagram (select and receive plate) of the present invention.
Reference:
Before and after 1-receiving roll, 2-motor, 3-bracket, 4-spraying canister, 5-piston pushing assisted plate, 6-
Adjusting handle, 7-move forward and backward track, 8-angular adjustment handwheel, 9-rear support stand, 10-installing rack,
11-front support stand, 12-experimental operation table, 13-installing plate, 14-regulate stand, 15-tie-beam, 16-
Reception board mounting stand, 17-pinch grip, 18-pushing assisted plate track, 19-move left and right track, 20-row
Cheng Kaiguan, 21-top installing plate, 22-bottom mounting plate, 23-screw bracket, 24-arc adjustment hole,
25-locking hole, 26-receive plate body, 27-mixing head.
Detailed description of the invention
Below in conjunction with the accompanying drawings, by specific embodiment, the invention will be further described.Following example
The most illustrative, it not determinate, it is impossible to limit protection scope of the present invention with this.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, including experimental operation table 12, peace
The injection equipment being loaded on experimental operation table and receiving mechanism, its innovation is: experiment behaviour
Being also equipped with spray angle governor motion in station, described injection equipment is single by horizontal level regulation
Unit and spraying canister 4 are constituted；Described spray angle governor motion by installing rack 10, bracket 3,
Regulation stand 14 and angular adjustment handwheel 8 are constituted, and the front end of bracket is rotatably installed in installing rack
On, the base plate of bracket is provided with injection equipment, at the both sides experimental operation table of bracket
On be symmetrically installed with regulation stand, the biside plate of bracket is symmetrically installed with and regulates stand
The gear that upper arc adjustment hole 24 is meshed, this gear is by angular adjustment hands installed upper outside it
Wheel realizes the movement in arc adjustment hole；Described receiving mechanism is by receiving roll 1 and receives plate structure
Becoming, described receiving roll is rotatably installed in by motor 2 on the installing rack installing bracket, institute
The plate upset that receives stated is installed on the front end of receiving roll.
Described horizontal level regulation unit is by moving forward and backward track 7, bottom mounting plate 22, front and back
Adjusting handle 6, move left and right track 19, top installing plate 21, spraying canister installing rack, piston help
Push pedal 5, pushing assisted plate track 18, motor and travel switch 20 are constituted, at the end of described bracket
Movable track is installed on plate, movable track is slidably fitted with bottom mounting plate,
Bottom mounting plate is fixed with adjustment seat, on the described bracket base plate before and after moving track
Rear end is fixed with screw bracket 23, is coated with screw rod, props up at screw rod in adjustment seat with screw bracket
Being fixed with before and after's adjusting handle on the rear portion screw rod of frame, described bottom mounting plate is by front and back regulating
Handwheel adjusting screw rod indent in adjustment seat moves before and after realizing on movable track,
Being arranged above of bottom mounting plate moves left and right track, is moving left and right bottom the both ends of track
Travel switch is installed on installing plate, installs moving left and right the mobile top that is provided with above track
Plate, top installing plate is driven by motor gear transmission and moves on top installing plate screw rod bottom it
Dynamic, the spraying canister installing rack installing spraying canister is installed, at spraying canister at the middle part of top installing plate
On two upper lateral part installing plates of installing rack, pushing assisted plate track is installed, at the rear portion pushing assisted plate of spraying canister
It is provided with on track by motor-driven piston pushing assisted plate.
Described reception plate is by front support stand 11, rear support stand 9, reception board mounting stand 16, installation
Plate 13, reception plate body 26, track, motor and travel switch are constituted, and regulate at described spray angle
The rear end of mechanism's installing rack is provided with rear support stand, at described spray angle governor motion installing rack
Front end is provided with reception board mounting stand, is provided with front support stand in the front end receiving board mounting stand,
Receive and be rotatablely equipped with installing plate on board mounting stand, the upper surface of installing plate is provided with by motor
The gear-driven reception plate body that can move forward and backward in orbit, is received plate body and is taken by installing plate
Being contained on front support stand or on rear support stand, described travel switch is installed on the installation of rail end
On plate.
Described spraying canister is 2.
In the leading section of two described spraying canisters, mixing head 27 is installed, this mixing head by hybrid chamber,
Spraying canister installing port and ejector pin installing port are constituted, and the rear end face lateral symmetry at hybrid chamber is provided with
The spraying canister installing port of spraying canister is installed, is provided with installation spray in the front end face centre position of hybrid chamber
Penetrate the ejector pin installing port of pin.
The biside plate of described bracket is provided with horizontal scale chi.
The arc adjustment hole of described regulation stand is provided with angle graduated scale.
A lock corresponding with arc adjustment hole is had in the outer ring of described regulation stand arc adjustment hole
Tieholen 25, is coated with bolt in locking hole, one end of bolt is connected with the side plate of bracket, spiral shell
The other end of bolt is fixedly mounted with pinch grip 17.
Between two described regulation stands, tie-beam 15 is installed.
During use, according to the physical property of solution in spraying canister, it is to use receiving roll when selecting and receive
Still receive plate, and manually adjust injection by adjusting handle before and after on horizontal level regulation unit
Distance between cylinder and receiving roll or reception plate.As selected receiving roll, then will receive the installing plate of plate
It is placed on front support stand, now, receives plate body and place down, then start machine switch, connect
Receiving roller to start to rotate, spraying canister sprays solution under the effect of pushing assisted plate, and meanwhile, spraying canister is on a left side
Move right movement back and forth on track, it is achieved the uniform winding in receiving roll, and, can basis
The character of solution, arbitrarily adjusts spraying canister by the angular adjustment handwheel on spray angle governor motion
Spray angle, to obtain different solutions best reception state in receiving roll, its obtain reality
Test data and the industrialized production of monodimension nanometer material is had guiding significance；If selecting to receive plate,
Then the installing plate receiving plate is placed on rear support stand, now, receives plate body and cover in receiving roll
On and place upward, during use, need first to lay one layer of masking foil on plate body receiving, will spray
Penetrate mechanism and be adjusted to receive the positive upper end of plate body by the angular adjustment handwheel of angle adjusting mechanism, this
Time, spraying canister is vertical with receiving plate body, then starts machine switch, receives plate body driving at motor
Dynamic lower movable, spraying canister moves left and right under the driving of motor, completes receiving on plate body
Uniformly injection.
Although disclose embodiments of the invention and accompanying drawing for the purpose of illustration, but the technology of this area
Personnel are understood that without departing from the present invention and spirit and scope of the appended claims, various
Replace, to change and modifications be all possible, therefore, the scope of the present invention be not limited to embodiment and
Accompanying drawing disclosure of that.
Claims (9)
1. a multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine, including experimental operation table, peace
The injection equipment being loaded on experimental operation table and receiving mechanism, it is characterised in that: at experimental operation table
On be also equipped with spray angle governor motion, described injection equipment by horizontal level regulation unit and
Spraying canister is constituted；Described spray angle governor motion is by installing rack, bracket, regulation stand
And angular adjustment handwheel is constituted, the front end of bracket is rotatably installed on installing rack, bracket
Base plate on injection equipment is installed, the both sides experimental operation table of bracket is symmetrically installed with
Regulation stand, is symmetrically installed with on the biside plate of bracket and regulates arc adjustment hole in stand
The gear being meshed, this gear realizes adjusting at arc by angular adjustment handwheel installed upper outside it
Movement in knothole；Described receiving mechanism is made up of receiving roll and reception plate, described receiving roll
Being arranged on by electric machine rotation on the installing rack installing bracket, described reception plate upset is installed
Front end in receiving roll.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine the most according to claim 1,
It is characterized in that: described horizontal level regulation unit by move forward and backward track, bottom mounting plate,
Front and back adjusting handle, move left and right track, top installing plate, spraying canister installing rack, piston boosting
Plate, pushing assisted plate track, motor and travel switch are constituted, and install on the base plate of described bracket
There is movable track, movable track is slidably fitted with bottom mounting plate, pacify in bottom
Being fixed with adjustment seat on dress plate, on described bracket base plate, front and back the rear end of moving track is fixedly mounted with
There is screw bracket, in adjustment seat with screw bracket, be coated with screw rod, at the rear portion spiral shell of screw bracket
Being fixed with before and after's adjusting handle on bar, described bottom mounting plate is by the regulation spiral shell of adjusting handle front and back
Bar indent in adjustment seat moves before and after realizing on movable track, bottom mounting plate
Be arranged above move left and right track, on the both ends bottom mounting plate move left and right track pacify
Equipped with travel switch, moving left and right the mobile top installing plate that is provided with, top peace above track
Dress plate is driven by motor gear transmission and moves, on top on top installing plate screw rod bottom it
The middle part of installing plate is provided with the spraying canister installing rack installing spraying canister, at the two of spraying canister installing rack
Pushing assisted plate track is installed on upper lateral part installing plate, the rear portion pushing assisted plate track of spraying canister is arranged
Have by motor-driven piston pushing assisted plate.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine the most according to claim 1,
It is characterized in that: described reception plate is by front support stand, rear support stand, reception board mounting stand, peace
Dress plate, reception plate body, track, motor and travel switch are constituted, and regulate machine at described spray angle
The rear end of structure installing rack is provided with rear support stand, before described spray angle governor motion installing rack
End is provided with reception board mounting stand, is provided with front support stand in the front end receiving board mounting stand, is connecing
Receive and be rotatablely equipped with installing plate on board mounting stand, the upper surface of installing plate is provided with by motor tooth
The reception plate body that can move forward and backward in orbit of wheel transmission, receives plate body and takes dress by installing plate
On front support stand or on rear support stand, described travel switch is installed on the installing plate of rail end
On.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine the most according to claim 1,
It is characterized in that: described spraying canister is 2.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine the most according to claim 4,
It is characterized in that: in the leading section of two described spraying canisters, mixing head is installed, this mixing head by
Hybrid chamber, spraying canister installing port and ejector pin installing port are constituted, in the rear end face both sides pair of hybrid chamber
Claim to be provided with the spraying canister installing port installing spraying canister, arrange in the front end face centre position of hybrid chamber
There is the ejector pin installing port installing ejector pin.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine the most according to claim 1,
It is characterized in that: horizontal scale chi is installed on the biside plate of described bracket.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine the most according to claim 1,
It is characterized in that: on the arc adjustment hole of described regulation stand, be provided with angle graduated scale.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine the most according to claim 1,
It is characterized in that: have in the outer ring of described regulation stand arc adjustment hole one with arc adjustment hole phase
Corresponding locking hole, is coated with bolt in locking hole, one end of bolt connects with the side plate of bracket
Connecing, the other end of bolt is fixedly mounted with pinch grip.
A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine the most according to claim 1,
It is characterized in that: between two described regulation stands, tie-beam is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410499296.6A CN104264240B (en) | 2014-09-25 | 2014-09-25 | A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410499296.6A CN104264240B (en) | 2014-09-25 | 2014-09-25 | A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine |
Publications (2)
| Publication Number | Publication Date |
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| CN104264240A CN104264240A (en) | 2015-01-07 |
| CN104264240B true CN104264240B (en) | 2016-08-24 |
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| CN201410499296.6A Expired - Fee Related CN104264240B (en) | 2014-09-25 | 2014-09-25 | A kind of multi-functional integrated type laboratory special-purpose electrostatic spinning-drawing machine |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256387B (en) * | 2015-11-06 | 2017-03-29 | 哈尔滨理工大学 | A kind of high-voltage electrostatic spinning machine of spinning adjustable angle |
| CN108914224A (en) * | 2018-09-05 | 2018-11-30 | 东华大学 | A kind of modularization electrostatic spinning integrating device that can work independently |
| CN109468687B (en) * | 2019-01-10 | 2023-10-03 | 珠海永格科技有限公司 | Electrostatic spinning machine for laboratory teaching |
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| CA2786931A1 (en) * | 2010-02-05 | 2011-08-11 | Marek Pokorny | Apparatus for production of two-dimensional or three-dimensional fibrous materials of microfibres and nanofibres |
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| CN203256377U (en) * | 2013-03-28 | 2013-10-30 | 昆山同日精密测试设备有限公司 | Electrostatic spinning device for preparing nanofibers in laboratory |
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