Preparation method and device of flash spraying nanofiber

Abstract

The invention relates to the technical field of nanofiber preparation, and particularly discloses a preparation method and device of flash spraying nanofiber, comprising a machine table, melt-blowing equipment and flash evaporation equipment are fixed on the machine table, a mixing cylinder is slidably arranged on the machine table, air nozzles are symmetrically and fixedly connected to one end of the mixing cylinder, and an induced draft fan is fixed on the machine table and located at the other end of the mixing cylinder; cord fabric is arranged between the mixing barrel and the induced draft fan, a flow guide cover is fixedly arranged on the flash evaporation equipment, annular plates which are symmetrically distributed are fixed to the inner wall of the flow guide cover, water conveying grooves are formed between the annular plates and the flow guide cover, and a cold water pipe is fixed to the top of the flow guide cover. The preparation method comprises the steps of preparing fibers; receiving the materials; and testing. The fibers with different thicknesses are produced through a flash evaporation method and a melt-blowing method, the fibers with different thicknesses are mixed through the air nozzle and the mixing cylinder, sound absorption and sound insulation of different frequency bands can be met by mixing the fibers with different thicknesses, the needed nanofiber is prepared through the preparation device according to the preparation method, and quantitative production of tens of nanometers of fibers is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of nanofiber preparation, in particular to a flash-sprayed nanofiber preparation method and a device thereof. Background Art

[0002] At present, most melt-blown processes use the experience of craftsmen to adjust the production parameters of a single product. The disadvantage of the melt-blown method is that the minimum fiber diameter is hundreds of nanometers; the flash evaporation method has a relatively low production volume and the solvent is difficult to recover.

[0003] In the prior art, the name disclosed in the application number: CN201910426410.5 is: an ultra-short electrospun polyimide nanofiber and a preparation method thereof, the IPC classification number is: D01F6 / 74, which includes the preparation of a polyamic acid solution; electrospinning to form a polyamic acid fiber felt; cutting the polyamic acid fiber felt into strips; thermal drawing to form polyimide fibers; and cutting to form ultra-short polyimide nanofibers.

[0004] However, the output of nanofibers prepared in the prior art is low, and the diameter of the prepared fibers cannot reach tens of nanometers, and nanofibers with finer diameters cannot be achieved. In addition, the porosity of the produced fibers cannot meet the requirements of sound absorption and sound insulation. Therefore, a method and device for preparing flash-sprayed nanofibers are needed. Summary of the invention

[0005] The object of the present invention is to provide a method and device for preparing flash-sprayed nanofibers to solve the problems in the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A preparation device for flash-blown nanofibers comprises a machine platform, on which a melt-blowing device and a flash evaporation device for producing fibers of different thicknesses are fixed, a mixing cylinder for fiber mixing processing is slidably arranged on the machine platform, one end of the mixing cylinder is symmetrically fixed with an air nozzle, an induced draft fan for sucking the mixed fibers is fixed on the machine platform and at the other end of the mixing cylinder, and a cord fabric for collecting is arranged between the mixing cylinder and the induced draft fan.

[0008] The flash evaporation device is fixedly provided with a flow guide hood for recovering the solvent, the inner wall of the flow guide hood is fixed with symmetrically distributed annular plates, a water delivery trough for discharging the solvent is formed between the annular plates and the flow guide hood, and a cold water pipe is fixed on the top of the flow guide hood.

[0009] Furthermore, a bidirectional slide for installing meltblowing equipment and flash evaporation equipment is fixed on the machine platform, an electric slide is fixed on the machine platform, a movable seat is slidably provided on the electric slide, a symmetrically distributed driving gear is rotatably provided on the movable seat, a mixing cylinder is rotatably provided on the driving gear, and an external rack for meshing with the driving gear is fixed on the mixing cylinder.

[0010] A motor for connecting a driving gear is fixedly provided at one end of the movable seat, a mounting frame is fixedly provided on an electric slide, a connecting frame is fixed on the machine platform, a roller for installing the cord fabric is rotatably connected to the movable seat, the electric slide, the mounting frame and the connecting frame, and a driving motor is fixedly connected to one end of the roller.

[0011] Furthermore, an annular filter screen rotates inside the flash evaporation device, a guide cover is arranged on the outside of the annular filter screen, an array of rib rods are fixed inside the flash evaporation device, the rib rods are fitted to the inside of the annular filter screen, a gear ring is fixed at one end of the annular filter screen, a motor 2 is fixed on the outside of the guide cover, a gear 1 is fixed to the output end of the motor 2, and the gear 1 cooperates with the gear ring.

[0012] Furthermore, a filter is fixed below the machine, the filter is connected to a water pipe for connecting to the bottom of the air deflector, a V-shaped filter is fixed inside the filter, a rotating rod is rotatably provided on the V-shaped filter, and a cross groove is provided on the rotating rod.

[0013] An array of elastic rods are slidably arranged in the cross groove, a barb is fixed on the elastic rod, a motor three is fixed on one side of the filter element, a rotating cover is rotatably arranged on the other end, the rotating cover is threadedly connected to the elastic rod, and the other end is fixed to the output end of the motor three, and the elastic rod is rotatably connected to the rotating cover.

[0014] Furthermore, a winding device is fixed on the machine platform, and the winding device is located on the side of the connecting frame away from the induced draft fan. A symmetrically distributed side frame is fixed on the winding device, and two rotating rods rotate between the two side frames. A wire roller is fixed on the rotating rod, and an annular groove is provided on the rotating rod. A motor 4 for connecting and driving the rotating rod is fixed on one side frame.

[0015] One end of the two rotating rods is fixed with a gear 2, and the two gears 2 cooperate with each other. A wire harness is fixed on the side frame, a cross bar is fixed between the two side frames, a guide block is fixed on the cross bar, a guide groove is provided in the side wall array of the guide block, a positioning block is fixed under the guide block, and a symmetrically distributed shaft rod is rotatably provided on the cross bar.

[0016] Furthermore, a gear three is fixed on the shaft rod, and two gear threes cooperate with each other. A motor five for connecting the shaft rod is fixed on the cross bar, a wire clamp is fixed to the end of the shaft rod, a base frame is fixed on the winding device, a guide rod is fixed on the base frame, a lead screw is rotatably provided on the base frame, a motor six for connecting the lead screw is fixed on the base frame, and a lifting frame is slidably provided on the guide rod.

[0017] A fixing rod is slidably arranged on the lifting frame, a sleeve is fixed on the lifting frame, the fixing rod slides in the sleeve, a baffle is fixedly arranged at one end of the fixing rod, a through groove is arranged at the other end, a limiting plate is slidably arranged on the fixing rod, a symmetrically distributed spring 1 is fixedly arranged on the limiting plate, and one end of the spring 1 is fixedly arranged on the lifting frame.

[0018] Furthermore, a gear four is fixed on the outer side of the limit plate, a motor seven is fixed on the limit plate, a gear five is fixedly connected to the output end of the motor seven, the gear five cooperates with the gear four, a pressure sensor is fixed on the baffle, a cylinder one is fixed to the bottom of the lifting frame, a lever is fixedly connected to the output end of the cylinder one, a swing frame is rotatably provided on the lifting frame, a detection clamp is fixedly connected to one end of the swing frame, and a straight groove is provided at the other end, the straight groove cooperates with the lever, and a pressure sensor is also fixed in the detection clamp.

[0019] An electric slide 2 is fixed on one of the side frames, a fixed frame slides on the electric slide 2, a motor 8 is fixed on the fixed frame, a round rod is fixed on the output end of the motor 8, a winding roller is mounted on the round rod, and an electric slide 3 is fixed on the other side frame, a cylinder 2 slides on the electric slide 3.

[0020] Furthermore, a moving rod is fixed to the output end of the cylinder 2, a motor 9 is fixed on the moving rod, a rocker arm is fixed to the output end of the motor 9, a cylinder 3 is fixed to the end of the rocker arm, a hollow tube is fixed to the end of the rocker arm, a wire locking plate is fixed to the output end of the cylinder 3, a wire roller is also rotatably provided on the hollow tube, and a convex plate is fixed to the wire roller.

[0021] Furthermore, the wiring harness is provided with a discharge groove, a positioning frame is fixedly connected to one side of the wiring harness, the positioning frame is symmetrically provided with open grooves, the open grooves cooperate with the annular grooves, the positioning frame is provided with a feed groove, the positioning frame is provided with an installation groove, a top frame is fixed in the installation groove, and two sliding blocks are slidably provided on the top frame.

[0022] A guide wheel is rotatably provided on the slider, a spring 2 is fixed on the top frame, one end of the spring 2 is connected to the slider, a through slot is provided in the positioning frame, horizontal rods are slidably provided on both sides of the through slot, a limiting rod is fixed at one end of the horizontal rod, the two limiting rods are located on both sides of the discharge trough, a reset spring is fixed in the through slot, and one end of the reset spring is connected to the limiting rod.

[0023] A method for preparing flash-sprayed nanofibers, using the flash-sprayed nanofiber preparation device to produce nanofibers, the preparation method comprising the following steps:

[0024] S1. Preparation of fibers

[0025] Nanofibers of different thicknesses are produced by melt-blowing equipment and flash evaporation equipment, and then the fibers are fed into a mixing barrel through an air nozzle to mix and obtain nano-scale fibers.

[0026] S2, receiving materials

[0027] The fibers are collected on the cord fabric under the action of the induced draft fan, and then pass through the two guide wheels, the feed trough, the two limit rods, the discharge trough in sequence, and then output from between the convex plate and the locking plate and wound on the winding roller.

[0028] S3. Testing

[0029] A portion of the produced fiber is output from between the two line rollers, and then divided into multiple strands to pass around the guide groove on the guide block and fixed in the through groove. The fixed rod is rotated to twist the multiple strands of fiber. The swing frame is controlled to rotate by cylinder 1, and the fiber is detected by the detection clamp.

[0030] Beneficial effects of the present invention:

[0031] 1. The preparation device of the present invention combines the flash evaporation method and the melt-blowing method to produce fibers of different thicknesses, and then uses an air nozzle and a mixing barrel to mix the fibers of different thicknesses, thereby improving the mixing uniformity of the fibers and diversifying the porosity of the mixed fibers of different thicknesses, which can meet the sound absorption and sound insulation requirements of different frequency bands, and at the same time has the advantages of lightweight and thermal insulation. The prepared fibers have high strength and excellent antibacterial effect;

[0032] 2. The preparation device of the present invention can evenly mix the fibers in the mixing barrel, and the mixing operation is simple. The prepared fibers can be automatically collected, which improves the production efficiency of tens of nanometer fibers, and can also perform strength and elasticity tests on the nanometer fibers.

[0033] 3. The preparation method of the present invention has simple and reliable preparation operations. The required nanofibers can be obtained through the preparation device, and the quantitative production of fibers of tens of nanometers can be achieved with high production efficiency. At the same time, the prepared fibers are strength tested to improve the strength of the produced fibers, and the produced fibers are sampled to improve the quality rate of the fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] Figure 1 It is a schematic structural diagram of the preparation device of the present invention;

[0036] Figure 2 It is a schematic diagram of the preparation device of the present invention;

[0037] Figure 3 is a cross-sectional view of the preparation device of the present invention;

[0038] Figure 4 The present invention Figure 3 The enlarged structural diagram at A in the middle;

[0039] Figure 5 The present invention Figure 3 The enlarged structural diagram at B in the middle;

[0040] Figure 6 is a partial cross-sectional view of the filter element of the present invention;

[0041] Figure 7 It is a schematic structural diagram of the preparation device of the present invention;

[0042] Figure 8 It is a structural schematic diagram of the winding device of the present invention;

[0043] Fig. 9 It is a schematic cross-sectional structure diagram of the winding device of the present invention;

[0044] Fig.10 It is a structural schematic diagram of the winding device of the present invention;

[0045] Fig.11 The present invention Fig.10 The enlarged structural diagram at C in the middle;

[0046] Fig.12 The present invention Fig.10 The enlarged structural diagram at D in the middle;

[0047] Fig.13 The present invention Fig.10 The enlarged structural diagram at E in the middle;

[0048] Fig.14 It is a schematic diagram of the structure of the wire harness of the present invention;

[0049] Fig.15 is a schematic cross-sectional structure diagram of the cable harness of the present invention;

[0050] Fig.16 is a schematic diagram of a Laval nozzle of the present invention;

[0051] Fig.17 Schematic diagram of the diameter ratio between the nozzle outlet and the thinnest part inside the nozzle of the present invention;

[0052] Fig.18 This is an analytical diagram of the air flow rate inside the Laval nozzle of the present invention;

[0053] Fig.19 Schematic diagram of a horizontal jet single air knife of the present invention;

[0054] Fig. 20 This is a schematic diagram of the double air knife-horizontal of the present invention;

[0055] Fig.21 1. It is a top view of the equipment of the flash spraying method of the present invention;

[0056] Fig. 22 It is a structural schematic diagram of a horizontal jet single air knife of the present invention;

[0057] Fig.23 It is a structural schematic diagram of the horizontal jet double air knife of the present invention;

[0058] Fig.24 It is a structural schematic diagram of the vertical jet double air knife of the present invention. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] A method and device for preparing flash-blown nanofibers, which quantitatively produce extremely fine fibers of tens of nanometers by combining flash evaporation and melt-blowing methods, and produce corresponding composite fiber materials with certain porosity. The device belongs to a type of continuous limited-position reinforced composite material production equipment, and the produced fibers have the advantages of good strength, thermal insulation, antibacterial, lightweight, good sound absorption, etc.

[0061] A flash spray nanofiber preparation device, such as Figure 1 , 2 As shown in 21, the preparation device includes a machine platform 1, on which a meltblowing device 2 and a flash evaporation device 3 are fixedly provided. A bidirectional slide 11 is fixedly provided on the machine platform 1, and the meltblowing device 2 and the flash evaporation device 3 are both installed on the bidirectional slide 11. Under the drive of the bidirectional slide 11, the meltblowing device 2 and the flash evaporation device 3 are controlled to move toward or in opposite directions to adjust the distance between the two.

[0062] In this embodiment, Figure 19-Figure 24 As shown, a single air knife or double air knife structure can be used. Fig.19 This is a schematic diagram of the horizontal jet single air knife structure. Fig. 20 It is a schematic diagram of the double air knife-horizontal structure. The double air knife-horizontal and vertical jet structures are the same, which is conducive to the fiberization of materials and the quality of fiber preparation can be controlled, such as Figure 2 , 21 As shown, the present invention adopts the configuration of melt-blowing method and flash evaporation method, that is, the advantage of flash-blowing method is that two different devices (melt-blowing device 2 and flash evaporation device 3) are placed in the most suitable position according to the characteristics of each device, and the characteristics of the devices are used to prepare fibers by different methods respectively. The preparation method has the following advantages:

[0063] 1. Develop material modification technology to improve the thermal fluidity of the material itself, making it easier to fiberize;

[0064] 2. Accurate simulation technology of the velocity distribution and temperature distribution of the nozzle jet, studying the relationship between velocity distribution and fiber diameter distribution, and improving the quality of the fiber;

[0065] 3. Combining meltblowing and flash steaming, we develop methods for flow guidance control, combing, and collection of produced fibers.

[0066] And the machine platform 1 is fixed with an electric slide 4, such as Figure 7 As shown, a moving seat 41 is slidably mounted on the electric slide 4, and a symmetrically distributed driving gear 42 is rotatably provided on the moving seat 41. A mixing barrel 43 is meshed with the driving gear 42, and an external rack is fixedly provided on the surface of the mixing barrel 43. The external rack meshes with the driving gear 42 to control the rotation of the mixing barrel 43.

[0067] A motor 40 is fixedly installed at one end of the movable seat 41, and the output end of the motor 40 is fixedly connected to the driving gear 42 to control the rotation of the driving gear 42. The movable seat 41 is driven by the electric slide 4 to control the distance between the mixing drum 43 and the discharge ports of the melt-blowing equipment 2 and the flash evaporation equipment 3. A symmetrically distributed air nozzle is fixedly provided on the machine 1 and located at one end of the mixing drum 43.

[0068] The air nozzle is tilted, and the angle between the air nozzle and the axis of the mixing drum 43 is 30-60 degrees. The air nozzle blows the fibers produced in the melt-blowing device 2 and the flash evaporation device 3, so that the two strands of fibers enter the mixing drum 43 at a certain speed, rotate and mix in the mixing drum 43, and ensure the mixing degree of the fibers.

[0069] In this embodiment, the development of the spinneret is involved: it includes the hole depth of the resin extrusion hole, the hole spacing, the relative distance between the resin extrusion hole and the air knife, the air flow rate, flow rate, temperature, velocity distribution and flow rate distribution and other indicators. Specifically, if all of the above are completed by experiments, there are problems with accuracy and cost. The present invention combines CFD fluid analysis with experimental data. Refer to the following table:

[0070]

[0071] And according to Fig.16 As shown, the area and diameter of the nozzle outlet and the thinnest part are designed, and the relevant calculations are as follows:

[0072]

[0073] like Fig.16 In the above formula, M is Mach, P is the pressure of each part, ρ is the density of each part, T is the temperature of each part, k is the specific heat ratio = 1.4, A and A c Indicates the area of ​​each part, L and L c Indicates the width or diameter of each part, and can intuitively reflect the relationship between the area and diameter at the nozzle outlet and the thinnest part.

[0074] A roller 45 is rotatably provided on the movable seat 41 and the electric slide 4, a mounting frame 44 is fixedly installed on the electric slide 4, and a roller 45 is also rotatably provided on the mounting frame 44, a draft fan 13 is fixedly provided at the other end of the mixing drum 43, a connecting frame 12 is fixedly provided on the machine 1 and at one end of the draft fan 13, and a roller 45 is also rotatably installed on the connecting frame 12, one end of the roller 45 is connected to a driving motor, and a plurality of rollers 45 are installed with cord fabrics, which are driven by the rotation of the rollers 45 to move in a circulation, and the limiting beam in the mixing drum 43 is sucked by the draft fan 13, and then adhered to the cord fabric for conveying and discharging.

[0075] A winding device 6 is fixedly provided on the machine platform 1 , and the winding device 6 is located on a side of the connecting frame 12 away from the induced draft fan 13 .

[0076] like Figure 3-6 As shown, an annular filter screen 31 is rotatably arranged in the flash evaporation device 3, a guide cover 34 is arranged on the outer side of the annular filter screen 31, and an array of rib bars 32 are fixedly arranged in the flash evaporation device 3. The rib bars 32 are attached to the inner side of the annular filter screen 31 and are used to support the annular filter screen 31. When the annular filter screen 31 rotates, the fibers attached to the inner wall of the annular filter screen 31 are moved, and the solvent evaporates and passes through the annular filter screen 31 to contact the top of the guide cover 34 upward.

[0077] The guide hood 34 is fixedly installed on the outside of the flash evaporation device 3, and is used to recover the solvent evaporated in the flash evaporation device 3. The inner wall of the guide hood 34 is fixedly provided with symmetrically distributed annular plates 35. The annular plates 35 are inclined, and a water trough is formed between the annular plates 35 and the guide hood 34. A cold water pipe 37 is fixedly installed on the top of the guide hood 34. After the solvent vapor contacts the top of the guide hood 34, it condenses and enters the water trough and flows to the bottom of the guide hood 34.

[0078] A gear ring 33 is fixedly provided at one end of the annular filter 31, a motor 2 30 is fixedly provided on the outer side of the air deflector 34, a gear 1 36 is fixedly connected to the output end of the motor 2 30, and the gear 1 36 is meshed with the gear ring 33, a water pipe 50 is fixedly provided at the bottom of the air deflector 34, a filter element 5 is fixedly connected to one end of the water pipe 50, and a V-shaped filter 52 is fixedly provided inside the filter element 5.

[0079] A rotating rod 53 is rotatably provided on the V-shaped filter screen 52, and a cross groove 54 is opened on the rotating rod 53. An array of elastic rods 56 are slidably provided in the cross groove 54. A barb 57 is fixedly provided on the elastic rod 56. The barb 57 is slidably set in the cross groove 54. A motor three 51 is fixedly provided on one side of the filter element 5, and a rotating cover 55 is rotatably provided on the other end. The rotating cover 55 is threadedly connected to one end of the elastic rod 56, and the other end is fixedly installed on the output end of the motor three 51. The elastic rod 56 is rotatably installed on one end of the rotating cover 55.

[0080] The condensed solvent is supplied to the filter element 5 from the water pipe 50, flows through the V-shaped filter screen 52, and the fibers mixed in the solvent remain on the V-shaped filter screen 52. The elastic rod 56 rotates to wind and clean the fibers on the V-shaped filter screen 52. The rotating cover 55 rotates and unscrews from the elastic rod 56, and then the elastic rod 56 is pulled out. The fibers on the surface of the rotating rod 53 are removed by the barb 57 on the elastic rod 56, and the surface of the elastic rod 56 is cleaned to keep the inside of the filter element 5 clean.

[0081] like Figure 8-14 As shown, the winding device 6 is fixed with symmetrically distributed side frames 61, and two rotating rods 611 are rotatably connected between the two side frames 61. The rotating rods 611 are fixed with line rollers 613, and the rotating rods 611 are opened with annular grooves 6110. A motor 4 610 is fixed on one side frame 61, and the output end of the motor 4 610 is fixedly connected to the end of a rotating rod 611. A gear 2 612 is fixedly installed on one end of the two rotating rods 611, and the two gears 2 612 are meshed to synchronize the rotational movement of the two rotating rods 611.

[0082] A wire harness 65 is fixedly provided on the side frame 61, a cross bar 614 is fixedly provided between the two side frames 61, a guide block 615 is fixedly provided on the cross bar 614, a guide groove 616 distributed in an array is provided on the side wall of the guide block 615, a positioning block 617 is fixedly provided below the guide block 615, a motor 6180 is fixedly provided on the cross bar 614 and on one side of the guide block 615, and symmetrically distributed shafts 618 are rotatably provided on the cross bar 614.

[0083] A gear three 6181 is fixedly provided on the shaft 618, and the two gear three 6181 are meshed. The output end of the motor five 6180 is fixedly connected to one shaft 618 to control the two shafts 618 to rotate in the same direction or in opposite directions. A wire clamp 619 is fixedly connected to the end of the shaft 618, and the wire clamp 619 is used to clamp and fix the fibers passing through the guide block 615.

[0084] A base frame 62 is fixedly provided on the winding device 6, a guide rod 622 is fixedly provided on the base frame 62, a lead screw 621 is rotatably provided on the base frame 62, a motor 620 is fixedly installed on the base frame 62, an output end of the motor 620 is fixedly connected to the end of the lead screw 621, a lifting frame 623 is slidably provided on the guide rod 622, a fixed rod 626 is slidably provided on the lifting frame 623, a sleeve 629 is fixedly provided on the lifting frame 623, and the fixed rod 626 is slidably installed in the sleeve 629.

[0085] A baffle 627 is fixedly connected to the bottom of the fixed rod 626, and a through groove 628 is opened at the other end. A limit plate 624 is slidably provided on the fixed rod 626, and a symmetrically distributed spring 1 625 is fixedly provided on the limit plate 624. One end of the spring 1 625 is fixedly connected to the lifting frame 623, and a gear 4 is fixedly provided on the outer side of the limit plate 624. A motor 7 6200 is fixedly provided on the limit plate 624, and a gear 5 6201 is fixedly connected to the output end of the motor 7 6200. The gear 5 6201 is meshed with the gear 4 to drive the fixed rod 626 to rotate.

[0086] A pressure sensor is fixed on the baffle 627. After the fiber passes through the wire roller 613, the fiber is divided into multiple strands and respectively inserted into the guide groove 616. Then, the end of the fiber is fixed in the through groove 628. Then, by rotating the fixing rod 626, the twisting of multiple fiber strands is controlled to form a fiber rope.

[0087] A cylinder 63 is fixedly provided at the bottom of the lifting frame 623, and a lever 631 is fixedly connected to the output end of the cylinder 63. A swing frame 64 is rotatably installed on the lifting frame 623. One end of the swing frame 64 is fixedly connected to a detection clamp 642, and the other end is provided with a straight groove 641. The straight groove 641 is slidably connected to the lever 631. The detection clamp 642 is located on one side of the fiber rope, and a pressure sensor is also fixedly provided in the detection clamp 642. By moving the detection clamp 642 to fit the fiber rope, the detection end of the pressure sensor fits the fiber rope to measure the elasticity and tensile strength of the fiber rope.

[0088] A vertically arranged electric slide 2 66 is fixed on a side frame 61, a fixed frame 661 is slidably arranged on the electric slide 2 66, a motor 8 662 is fastenedly installed on the fixed frame 661, an output end of the motor 8 662 is fixedly connected to a round rod, a winding roller 663 is mounted on the round rod to wind up the nanofibers produced by flash spraying and recycle the prepared nanofibers.

[0089] A horizontally arranged electric slide 3 67 is fixedly provided on the other side frame 61, a cylinder 2 671 is slidably provided on the electric slide 3 67, a moving rod 672 is fixedly provided on the output end of the cylinder 2 671, a motor 9 673 is fixedly installed on the moving rod 672, a rocker arm 674 is fixedly connected to the output end of the motor 9 673, a cylinder 3 676 is fixedly connected to the end of the rocker arm 674, and a hollow tube 675 is fixedly provided on the end of the rocker arm 674.

[0090] The output end of cylinder three 676 slides in the hollow tube 675, and the output end of cylinder three 676 passes through the hollow tube 675. The output end of cylinder three 676 is fixedly connected to a wire locking plate 679. A wire roller 613 is also rotatably provided on the hollow tube 675, and a convex plate 678 is fixedly installed on the wire roller 613. The fiber is transported between the convex plate 678 and the wire locking plate 679, and then wound around the winding roller 663.

[0091] After the winding roller 663 is replaced, the fiber bundle is fixedly clamped on the convex plate 678 by using the locking plate 679. After the motor 673 is rotated, the swing rod 674 drives the fiber bundle to be wound around the winding roller 663, which is convenient for subsequent winding.

[0092] A discharge groove 651 is provided on the wire harness component 65, and a positioning frame 68 is fixedly connected to one side of the wire harness component 65. The positioning frame 68 is provided with symmetrically distributed opening grooves 681, and the opening grooves 681 cooperate with the annular groove 6110. The positioning frame 68 is provided with an inlet groove 60 coaxial with the discharge groove 651. The positioning frame 68 is provided with an installation groove 682, and a top frame 69 is fixedly installed in the installation groove 682. Two sliders 691 are slidably provided on the top frame 69.

[0093] A guide wheel 693 is rotatably provided on the slider 691. The two guide wheels 693 are located on both sides of the feed trough 60 to guide the fibers. A spring 2 692 is fixedly installed on the top frame 69. One end of the spring 2 692 is fixedly connected to one side of the slider 691 for resetting the slider 691. A through slot 683 is provided in the positioning frame 68. Horizontal rods 684 are slidably provided on both sides of the through slot 683. A limit rod 685 is fixedly provided at one end of the horizontal rod 684.

[0094] Two limiting rods 685 are located on both sides of the discharge slot 651 to limit the fiber bundle, and a return spring 686 is fixedly connected inside the through slot 683 , one end of the return spring 686 is fixedly connected to the limiting rod 685 for tensioning the limiting rod 685 .

[0095] Here’s how it works:

[0096] The viscosity of the prepared spinning solution needs to be adjusted to less than 50 Pa·s within the shear speed range of 1000 to 100001 / s, and then sprayed out through the melt-blowing device 2. The viscosity of the prepared spinning solution needs to be adjusted to less than 150 mPa·s within the shear speed range of 1000 to 100001 / s, and then sprayed out by the flash evaporation device 3. The resin spinning solution nozzle aperture of the device is 0.25-0.6 mm, the hole depth is not less than 2 mm, the hole edge spacing is 0.3-1.5 mm, and the air flow rate is subsonic (150 m / s)-supersonic (1.5 Mach).

[0097] The meltblowing device 2 and the flash evaporation device 3 produce nanofibers of corresponding diameters. The distance between the meltblowing device 2 and the flash evaporation device 3 is adjusted by an electric slide 4, and then the discharge ports of the two are directed toward the inside of the mixing drum 43. The angle between the two discharge ports and the axis of the mixing drum 43 is 30-60 degrees. Then, fibers of different thicknesses are supplied into the mixing drum 43 through an air nozzle. Fibers of different thicknesses are rotated into the mixing drum 43 and mixed to obtain nano-scale fibers, which can be mass-produced.

[0098] After the fibers are evenly mixed, they are discharged from the mixing drum 43, sucked from the induced draft fan 13, collected on the cord fabric, and then output from the cord fabric. The fibers are output from between the two guide wheels 693, and then pass through the feed trough 60, two limit rods 685 and the discharge trough 651, and are transported between the convex plate 678 and the locking plate 679, and then are wound around the winding roller 663.

[0099] During the production process, a portion of the fiber is separated and output from between the two line rollers 613, and then the fiber is divided into multiple strands and respectively inserted into the guide groove 616, and then the end of the fiber is fixed in the through groove 628, and then the fixing rod 626 is rotated to control the twisting of multiple fiber strands to form a fiber rope.

[0100] After moving the lifting frame 623, the fiber rope is tightened and the tensile strength of the fiber rope is tested. The swing frame 64 is controlled to rotate by the cylinder 63, and the fiber rope is pressurized by the detection clamp 642 to test the elasticity of the limit rope, test the produced fiber rope, perform performance tests on the produced reinforcing fibers, and test the quality of the produced fibers.

[0101] A method for preparing flash-sprayed nanofibers, the method comprising the following steps:

[0102] S1. Preparation of fibers

[0103] Nanofibers of different thicknesses are produced by meltblowing equipment 2 and flash evaporation equipment 3, and then the fibers are fed into a mixing drum 43 through an air nozzle to be mixed to obtain nano-scale fibers.

[0104] S2, receiving materials

[0105] The fibers are collected on the cord fabric under the action of the induced draft fan 13, and then the fibers pass through between the two guide wheels 693, the feed trough 60, between the two limit rods 685, and the discharge trough 651 in sequence, and then output from between the convex plate 678 and the locking plate 679, and are wound around the winding roller 663.

[0106] S3. Testing

[0107] A portion of the produced fiber is output from between the two line rollers 613, and then divided into multiple strands, which pass around the guide groove 616 on the guide block 615 and are fixed in the through groove 628. The fixed rod 626 is rotated to twist the multiple strands of fiber. The swing frame 64 is controlled to rotate by the cylinder 63, and the fiber is detected by the detection clamp 642.

[0108] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A flash-sprayed nanofiber preparation device, comprising a machine (1), characterized in that: The machine (1) is fixed with a melt-blowing device (2) and a flash evaporation device (3) for producing fibers of different thicknesses, a mixing drum (43) for fiber mixing processing is slidably provided on the machine (1), one end of the mixing drum (43) is symmetrically fixed with an air nozzle, an induced draft fan (13) for sucking the mixed fibers is fixed on the machine (1) and located at the other end of the mixing drum (43), and a cord fabric for collecting is provided between the mixing drum (43) and the induced draft fan (13); The flash evaporation device (3) is fixedly provided with a flow guide hood (34) for recovering the solvent, the inner wall of the flow guide hood (34) is fixed with symmetrically distributed annular plates (35), a water delivery trough for discharging the solvent is formed between the annular plates (35) and the flow guide hood (34), and a cold water pipe (37) is fixed on the top of the flow guide hood (34).

2. The flash-sprayed nanofiber preparation device according to claim 1, characterized in that: The machine platform (1) is fixedly provided with a bidirectional slide (11) for installing the melt-blowing equipment (2) and the flash evaporation equipment (3); the machine platform (1) is fixedly provided with an electric slide platform (4); a movable seat (41) is slidably provided on the electric slide platform (4); a symmetrically distributed driving gear (42) is rotatably provided on the movable seat (41); a mixing cylinder (43) is rotatably provided on the driving gear (42); an external rack for meshing with the driving gear (42) is fixed on the mixing cylinder (43); A motor (40) for connecting to a driving gear (42) is fixedly provided at one end of the movable seat (41); a mounting frame (44) is fixedly provided on the electric slide (4); a connecting frame (12) is fixedly provided on the machine (1); a roller (45) for installing the cord fabric is rotatably connected to the movable seat (41), the electric slide (4), the mounting frame (44) and the connecting frame (12); and a driving motor is fixedly provided at one end of the roller (45).

3. The flash-sprayed nanofiber preparation device according to claim 1, characterized in that: An annular filter screen (31) rotates inside the flash evaporation device (3), a flow guide cover (34) is arranged outside the annular filter screen (31), rib bars (32) distributed in an array are fixed inside the flash evaporation device (3), the rib bars (32) are attached to the inside of the annular filter screen (31), a gear ring (33) is fixed to one end of the annular filter screen (31), a motor 2 (30) is fixed to the outside of the flow guide cover (34), a gear 1 (36) is fixed to the output end of the motor 2 (30), and the gear 1 (36) cooperates with the gear ring (33).

4. The flash-sprayed nanofiber preparation device according to claim 1, characterized in that: A filter element (5) is fixed below the machine (1), the filter element (5) is connected to a water pipe (50) for connecting to the bottom of the deflector (34), a V-shaped filter screen (52) is fixed inside the filter element (5), a rotating rod (53) is rotatably provided on the V-shaped filter screen (52), and a cross groove (54) is provided on the rotating rod (53); An array of elastic rods (56) are slidably arranged in the cross groove (54), and a barb (57) is fixedly arranged on the elastic rod (56). A motor (51) is fixedly arranged on one side of the filter element (5), and a rotating cover (55) is rotatably arranged on the other end. The rotating cover (55) is threadedly connected to the elastic rod (56), and the other end is fixed to the output end of the motor (51). The elastic rod (56) is rotatably connected to the rotating cover (55).

5. The flash-sprayed nanofiber preparation device according to claim 1, characterized in that: The machine platform (1) is fixedly provided with a winding device (6), the winding device (6) being located on a side of the connecting frame (12) away from the induced draft fan (13), the winding device (6) being fixed with symmetrically distributed side frames (61), two rotating rods (611) rotating between the two side frames (61), a wire roller (613) being fixed on the rotating rod (611), an annular groove (6110) being provided on the rotating rod (611), and a motor (610) for connecting and driving the rotating rod (611) being fixedly connected to one of the side frames (61); One end of the two rotating rods (611) is fixed with a gear 2 (612), the two gear 2s (612) cooperate, a wire harness (65) is fixed on the side frame (61), a cross bar (614) is fixed between the two side frames (61), a guide block (615) is fixed on the cross bar (614), a guide groove (616) is arranged in an array on the side wall of the guide block (615), a positioning block (617) is fixed below the guide block (615), and a symmetrically distributed shaft (618) is rotatably provided on the cross bar (614).

6. The flash-sprayed nanofiber preparation device according to claim 5, characterized in that: The shaft (618) is fixedly provided with a gear three (6181), the two gear threes (6181) cooperate with each other, a motor five (6180) for connecting the shaft (618) is fixedly provided on the cross bar (614), a cable clamp (619) is fixedly connected to the end of the shaft (618), a base frame (62) is fixedly provided on the winding device (6), a guide rod (622) is fixedly provided on the base frame (62), a lead screw (621) is rotatably provided on the base frame (62), a motor six (620) for connecting the lead screw (621) is fixedly provided on the base frame (62), and a lifting frame (623) is slidably provided on the guide rod (622); A fixing rod (626) is slidably mounted on the lifting frame (623), a sleeve (629) is fixedly mounted on the lifting frame (623), the fixing rod (626) slides in the sleeve (629), one end of the fixing rod (626) is fixedly mounted with a baffle (627), and the other end is provided with a through groove (628), a limiting plate (624) is slidably mounted on the fixing rod (626), a symmetrically distributed spring (625) is fixedly mounted on the limiting plate (624), and one end of the spring (625) is fixedly mounted on the lifting frame (623).

7. The flash-sprayed nanofiber preparation device according to claim 6, characterized in that: A gear four is fixed on the outer side of the limit plate (624), a motor seven (6200) is fixed on the limit plate (624), a gear five (6201) is fixedly connected to the output end of the motor seven (6200), the gear five (6201) cooperates with the gear four, a pressure sensor is fixed on the baffle (627), a cylinder one (63) is fixed to the bottom of the lifting frame (623), a lever (631) is fixedly connected to the output end of the cylinder one (63), a swing frame (64) is rotatably mounted on the lifting frame (623), a detection clamp (642) is fixedly connected to one end of the swing frame (64), and a straight groove (641) is provided at the other end, the straight groove (641) cooperates with the lever (631), and a pressure sensor is also fixed in the detection clamp (642); An electric slide 2 (66) is fixed on one of the side frames (61), a fixed frame (661) slides on the electric slide 2 (66), a motor 8 (662) is fixedly connected to the fixed frame (661), a round rod is fixedly connected to the output end of the motor 8 (662), a winding roller (663) is mounted on the round rod, and an electric slide 3 (67) is fixed on the other side frame (61), and a cylinder 2 (671) slides on the electric slide 3 (67).

8. The flash-sprayed nanofiber preparation device according to claim 7, characterized in that: A moving rod (672) is fixed to the output end of the cylinder 2 (671), a motor 9 (673) is fixed to the moving rod (672), a swing rod (674) is fixed to the output end of the motor 9 (673), a cylinder 3 (676) is fixed to the end of the swing rod (674), a hollow tube (675) is fixed to the end of the swing rod (674), a locking plate (679) is fixed to the output end of the cylinder 3 (676), a wire roller (613) is also rotatably provided on the hollow tube (675), and a convex plate (678) is fixed to the wire roller (613).

9. The flash-sprayed nanofiber preparation device according to claim 8, characterized in that: The wire harness component (65) is provided with a discharge groove (651), a positioning frame (68) is fixedly connected to one side of the wire harness component (65), the positioning frame (68) is symmetrically provided with opening grooves (681), the opening grooves (681) cooperate with the annular groove (6110), the positioning frame (68) is provided with a feeding groove (60), the positioning frame (68) is provided with a mounting groove (682), a top frame (69) is fixed in the mounting groove (682), and two sliding blocks (691) are slidably provided on the top frame (69); A guide wheel (693) is rotatably provided on the slider (691), a second spring (692) is fixed on the top frame (69), one end of the second spring (692) is connected to the slider (691), a through slot (683) is provided in the positioning frame (68), horizontal rods (684) are slidably provided on both sides of the through slot (683), a limiting rod (685) is fixed at one end of the horizontal rod (684), the two limiting rods (685) are located on both sides of the discharge trough (651), a return spring (686) is fixed in the through slot (683), and one end of the return spring (686) is connected to the limiting rod (685).

10. A method for preparing flash-sprayed nanofibers, using the flash-sprayed nanofiber preparation device according to any one of claims 1 to 9 to produce nanofibers, characterized in that: The preparation method comprises the following steps: S1. Preparation of fibers Nanofibers of different thicknesses are produced by melt-blowing equipment (2) and flash evaporation equipment (3), and then the fibers are fed into a mixing drum (43) through an air nozzle to mix and obtain nano-scale fibers; S2, receiving materials The fibers are collected on the cord fabric under the action of the induced draft fan (13), and then the fibers pass through between the two guide wheels (693), the feed trough (60), between the two limit rods (685), and the discharge trough (651) in sequence, and then output from between the convex plate (678) and the locking plate (679), and are wound on the winding roller (663); S3. Testing A portion of the produced fiber is output from between two line rollers (613), and then divided into multiple strands, which pass through the guide groove (616) on the guide block (615) and are fixed in the through groove (628). The fixed rod (626) is rotated to twist the multiple strands of fiber, and the swing frame (64) is controlled to rotate by the cylinder (63), and the fiber is detected by the detection clamp (642).

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