A stable melt near-field direct writing device

Abstract

The invention discloses a stable near-field direct writing device for melt, comprising a spinneret device and a receiving device, wherein the receiving device comprises a receiving plate, a receiving plate mounting frame, an X-axis movable bracket and a Y-axis movable bracket, wherein the receiving plate is mounted on the receiving plate mounting frame, the receiving plate mounting frame is connected to the X-axis movable bracket, a movable lead screw is installed in the X-axis movable bracket, and the receiving plate mounting frame is driven to move by the movable lead screw; the X-axis movable bracket is connected to the Y-axis movable bracket, and a pulley assembly is installed in the Y-axis movable bracket, and the Y-axis movable bracket is driven to move by the pulley assembly; the spinneret device comprises a spinning injector, a heat-insulating sleeve and an air heating assembly, a heating chamber is arranged in the heat-insulating sleeve, and the air heating assembly is connected to the heating chamber. The integrated receiving device comprises a receiving plate, a receiving plate mounting frame, an X-axis movable bracket and a Y-axis movable bracket, wherein the components are tightly and firmly connected, and the movement in the X-axis and Y-axis directions is stable, and the stability and accuracy of the jet during the spinning process are optimized.

Description

Technical Field

[0001] The invention belongs to the field of melt near-field direct writing technology and 3D printing technology, and specifically relates to a stable melt near-field direct writing device. Background Art

[0002] Electrospinning is a special fiber preparation process in which a polymer solution or melt is jet-spun in an electrostatic field. Under the action of the electric field, the droplet at the needle tip changes from a sphere to a cone (i.e., a "Taylor cone"), and extends from the tip of the cone to obtain fiber filaments. This method can produce polymer filaments with a diameter of nanometers. Electrospinning can be divided into solution electrospinning and melt electrospinning. Melt electrospinning uses polymer melt as raw material, heats and melts the high molecular polymer into a spinning melt of a certain viscosity, and uses an injection pump or pneumatic device to continuously and evenly extrude it to the spinneret, and presses it out through the fine holes of the spinneret to become a filament flow, which is stretched into filaments by electrostatic drawing, and finally cooled and solidified in air or water. Compared with solution spinning, melt electrospinning directly spins the raw materials, does not require solvents, and there is no problem of removing solvents. The final material is non-toxic and suitable for use in tissue engineering, clinical medicine and other fields. Since there is no solvent volatilization during the spinning process, the utilization efficiency of polymers and the production efficiency of scaffold materials can be greatly improved.

[0003] Melt electrospinning, the spinning equipment mainly includes a spinneret device, a heating device, a pneumatic device, a voltage device, and a receiving device. In recent years, melt near-field direct writing technology has emerged on the basis of melt electrospinning. This technology reduces the receiving distance of melt electrospinning, so that the jet reaches the receiving device before whipping occurs. At the same time, it is assisted by an XY axial motion slide receiving device. Through the path planning of the motion slide, the fiber diameter, fiber scaffold pore size and topological structure can be controlled. Therefore, this technology has been gradually applied to the fields of human tissue engineering scaffolds, artificial blood vessels, ion battery diaphragms, ultrafiltration and nanofiltration membranes, etc.

[0004] In the near-field direct writing technology of melt, the stable XY axial motion of the receiving device is the key to the precise and orderly deposition of fibers, and the realization of its stable axial motion requires the XY axial motion to be precisely coordinated and closely connected. In the prior art, the XY axial motion is realized by using a connected X-axis moving mechanism and a Y-axis moving mechanism, which are connected by a slide, and the structural stability is poor and prone to failure, thereby affecting the stability of the jet and further affecting the final spinning effect. Summary of the invention

[0005] The purpose of the present invention is to provide a stable melt near-field direct writing equipment. In view of the defects in the prior art, an integrated receiving device is designed, including a receiving plate, a receiving plate mounting frame, an X-axis movable bracket and a Y-axis movable bracket. The components are tightly and firmly connected, and the movement in the X-axis and Y-axis directions is stable, thereby optimizing the stability and accuracy of the jet during the spinning process.

[0006] In order to solve the above technical problems, the following technical solutions are adopted:

[0007] A stable melt near-field direct writing device comprises a spinneret device and a receiving device, characterized in that: the receiving device comprises a receiving plate, a receiving plate mounting frame, an X-axis movable bracket and a Y-axis movable bracket, the receiving plate is mounted on the receiving plate mounting frame, the receiving plate mounting frame is connected to the X-axis movable bracket, a movable lead screw is installed in the X-axis movable bracket, and the receiving plate mounting frame is driven to move by the movable lead screw; the X-axis movable bracket is connected to the Y-axis movable bracket, the Y-axis movable bracket is installed with a pulley assembly, the pulley assembly slides on a matching pulley track, and the Y-axis movable bracket is driven to move by the pulley assembly; the spinneret device comprises a spinning injector, a heat-insulating sleeve and an air heating assembly, the spinning injector is installed in the heat-insulating sleeve, and a heating chamber is provided in the heat-insulating sleeve, and the air heating assembly is connected to the heating chamber.

[0008] Furthermore, the receiving plate mounting frame includes a bracket, a support rod and a top support. The upper end of the bracket is connected to a support rod. The upper end of the support rod is provided with a mounting head. The mounting head is L-shaped and provided with a bracket. The bracket is used to install the receiving plate. The mounting head and the receiving plate are provided with matching connecting screw holes and are equipped with a fixing knob. The fixing knob is provided with a first screw, and the first screw matches the connecting screw hole. The top support is arched upward, and its upper end flatly supports the receiving plate. Four support rods are connected to the four corners of the bracket. The mounting heads of the four support rods are respectively connected to the four corners of the receiving plate. At the same time, the receiving plate is supported by the top support. Such a setting can significantly improve the installation stability and movement stability of the receiving plate. The mounting head is provided with a bracket, which matches the corners of the receiving plate and is tightened and fixed by the fixing knob after pre-installation. The bracket and the fixing knob have positioning and fixing functions, so that the installation position of the receiving plate remains constant, thereby ensuring the stability and accuracy of the jet. Based on the detachable characteristics of the receiving plate, it is convenient to clean or replace it to keep no impurities mixed after deposition and improve the spinning effect.

[0009] Furthermore, the movable lead screw includes a lead screw motor, a lead screw, a ball nut, a ball nut seat and a connecting piece, the lead screw motor is connected to the lead screw, the ball nut and the ball nut seat are connected to the lead screw, the ball nut and the ball nut seat are connected to each other, and the ball nut seat is provided with a connecting piece; the lower end of the receiving plate mounting frame is connected to a main slider and a secondary slider, the main slider is connected to the connecting piece; the main slider and the secondary slider are both provided with rollers, and a roller track is provided in the opening of the X-axis movable bracket, and the roller track matches the roller. The present invention sets the main slider and the secondary slider to guide the receiving plate mounting frame to move in the X-axis direction, increases the contact area between the receiving plate mounting frame and the X-axis movable bracket, so that the front and rear positions of the receiving plate mounting frame are all subjected to the force of the movable lead screw, which can significantly improve the stability of the movement; the roller can reduce the friction generated during the movement, and avoid problems such as movement jamming.

[0010] Furthermore, the pulley assembly includes a pulley motor group, a main shaft and a pulley group. The pulley motor is connected to the main shaft on both sides. The main shafts on both sides are respectively connected to a group of pulley groups. The pulley group includes an active pulley and a driven pulley. The active pulley and the driven pulley both slide on the pulley track. The pulley assembly is used to drive the receiving plate to move in the Y-axis direction. It is set on both sides of the Y-axis moving bracket to cooperate to achieve the movement in the Y-axis direction. Both are evenly stressed and have strong bearing capacity. The friction of the pulley group is small, and the movement is smooth, which can significantly improve the stability of the movement in the Y-axis direction.

[0011] Furthermore, the spinneret device also includes a clamping lock cover, which is composed of a left cover and a right cover that can be folded relative to each other, and a through hole is formed between the left cover and the right cover; a clamping notch is provided in the clamping lock cover, and the clamping notch matches the end of the spinning syringe, and an external thread is provided on the surface of the clamping lock cover, and an internal thread is provided at the opening of the insulation sleeve, and the external thread matches the internal thread, and the clamping lock cover clamps the spinning syringe and fixes it to the insulation sleeve. The clamping lock cover is used to clamp the spinning syringe and is fixed to the insulation sleeve by threading, so as to achieve the purpose of installing the spinning syringe, and is firmly installed and easy to disassemble, without touching the spinning syringe, and avoiding burns; after the clamping lock cover is tightened, the spinning syringe is firmly installed in the insulation sleeve, and there is no need to set up an additional cover body, and there is no specific requirement for the internal structure of the insulation sleeve.

[0012] Furthermore, the left cover and the right cover are provided with finger rings, and the left cover and the right cover are controlled by the finger rings. A magnet sheet 1 is provided where the left cover contacts the right cover, and a magnet sheet 2 is provided where the right cover contacts the left cover. The magnet sheet 1 and the magnet sheet 2 match each other. The finger ring facilitates the control of the left cover and the right cover, and the magnet sheet 1 and the magnet sheet 2 provide magnetic attraction to achieve the purpose of pre-clamping, which is convenient for screwing the clamping lock cover into the heat insulation sleeve, with a simple structure and ingenious design.

[0013] Furthermore, the air heating component includes an external circulating bellows, which includes a heating layer and a circulating layer. The heating layer is provided with an air inlet and a heater is installed inside. The air inlet is connected to the air outlet joint of the thermal insulation sleeve through an air pipe, and the heater heats the air flow passing through the heating layer; a fan is installed in the circulating layer, and the fan is connected to the heating layer. The circulating layer is also provided with an air outlet, and the air outlet is connected to the air inlet joint of the thermal insulation sleeve through an air pipe; the thermal insulation sleeve is also provided with an air outlet channel and an air inlet channel, both of which are connected to the heating chamber, the air outlet channel is connected to the air outlet joint, and the air inlet channel is connected to the air inlet joint. The present invention heats the spinning syringe by air heating, and keeps the temperature of the heating chamber at the set temperature in a circulating manner; the principle is as follows: driven by a fan, the air circulates back and forth in the order of heating chamber-air outlet channel-circulating bellows-air inlet channel-heating chamber, flows through the heating layer to supplement the heat, and heats it to the set temperature, and then flows back to the heating chamber through the fan, and the process is repeated until the spinning is completed; the air heating method is easy to control, and can keep the temperature of the heating chamber at the set temperature at all times, the heating air is in direct contact with the spinning syringe, the heat transfer effect is significant, and the morphology of the polymer is always kept in a molten state; the internal structure of the insulation sleeve is simplified, and there is no need to set a heating collar.

[0014] Furthermore, the upper port and the lower port of the heating chamber are both provided with sealing rubber sleeves; the heat insulating sleeve comprises an inner heat conducting layer and an outer heat insulating layer.

[0015] Furthermore, an alligator clip is installed at the needle of the spinning syringe, and the alligator clip is connected to a voltage device to apply a certain voltage to the needle.

[0016] Furthermore, the upper barrel end of the spinning syringe is connected to a pneumatic device, through which the polymer extrusion is controlled; the heat-insulating sleeve is provided with a probe hole, in which a temperature-sensing rod probe is installed. The aperture of the probe hole is the same as the diameter of the temperature-sensing rod probe, and the temperature-sensing rod probe can be inserted into the vicinity of the needle of the spinning syringe through the probe hole, which is conducive to the temperature monitored by the temperature-sensing rod probe being consistent with the actual temperature of the needle of the spinning syringe.

[0017] The above technical solution has the following beneficial effects:

[0018] The present invention is a stable melt near-field direct writing device. In view of the defects in the prior art, an integrated receiving device is designed, including a receiving plate, a receiving plate mounting frame, an X-axis movable bracket and a Y-axis movable bracket. The components are tightly and firmly connected, and the movement in the X-axis and Y-axis directions is stable, thereby optimizing the stability and accuracy of the jet during the spinning process.

[0019] The receiving plate mounting frame, the X-axis moving bracket and the Y-axis moving bracket together form the skeleton structure of the receiving device, which has strong structural integrity, firm connection, large and uniform force bearing area during movement and high stability.

[0020] The spinning syringe is heated by air heating, and the temperature of the heating chamber is kept at the set temperature in a circulating manner. The heating and heat preservation effect is good, the hot air is in direct contact with the spinning syringe, and the heat exchange is direct, which can avoid the deviation between the heating temperature and the actual temperature.

[0021] The clamping lock cover is used to clamp the spinning syringe and is fixed to the insulation sleeve by threading, so as to achieve the purpose of installing the spinning syringe. It is firmly installed and easy to disassemble. There is no need to touch the spinning syringe to avoid burns. After the clamping lock cover is tightened, the spinning syringe is firmly installed in the insulation sleeve, without the need for an additional cover body, and there are no specific requirements for the internal structure of the insulation sleeve.

[0022] Instruction Manual

[0023] The present invention will be further described below in conjunction with the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of the melt near-field direct writing device of the present invention;

[0025] Figure 2 is a schematic diagram of the structure of a receiving device;

[0026] Figure 3 It is a schematic diagram of the explosion structure of the receiving device;

[0027] Figure 4 is a schematic diagram of the structure of the pulley assembly;

[0028] Figure 5 It is a structural schematic diagram of the pulley block;

[0029] Figure 6 It is a schematic diagram of the connection between the mounting head and the receiving plate;

[0030] Figure 7 It is a structural schematic diagram of a spinneret device;

[0031] Figure 8 (a) is a schematic diagram of the cross-sectional structure of a spinneret device;

[0032] Fig. 9 (b) is a schematic diagram of the cross-sectional structure of the spinneret device;

[0033] Fig.10 It is a schematic diagram of the structure of clamping the lock cover;

[0034] Fig.11 It is a structural schematic diagram of the right cover;

[0035] Fig.12 It is a schematic diagram of the structure of the circulating bellows. DETAILED DESCRIPTION

[0036] like Figures 1 to 12 As shown, a stable near-field melt direct writing device includes a spinneret device 2, a receiving device 1, a base plate 6, a pneumatic device, and a voltage device. The base plate 6 is equipped with the receiving device 1, and the axial movement of the receiving plate 5 in the X-axis and Y-axis is realized through the receiving device 1. The base plate 6 is connected to a base plate bracket 3, and the base plate bracket 3 is used to install a Z-axis moving bracket 4. The Z-axis moving bracket 4 is equipped with a lead screw and connected to the spinneret device 2. The lead screw drives the spinneret device 2 to make an axial movement in the Z axis. The axial movements of the above-mentioned X-axis, Y-axis, and Z-axis are all controlled by a predetermined program. The pneumatic device is used to control the jet velocity of the spinneret device 2, and the voltage device is used to control the supply voltage of the spinneret device 2.

[0037] The melt near-field direct writing device of the present invention is applied to laboratories, has a relatively small structure size, and is mainly used for experimental research.

[0038] The receiving device 1 includes a receiving plate 5, a receiving plate mounting frame 11, an X-axis movable bracket 12 and a Y-axis movable bracket 13. The receiving plate 5 is mounted on the receiving plate mounting frame 11, and the receiving plate mounting frame 11 is connected to the X-axis movable bracket 12. A movable lead screw is installed in the X-axis movable bracket 12, and the receiving plate mounting frame 11 is driven to move by the movable lead screw; the X-axis movable bracket 12 is connected to the Y-axis movable bracket 13, and the Y-axis movable bracket 13 is installed with a pulley assembly, and the pulley assembly slides on a matching pulley track 14, and the Y-axis movable bracket 13 is driven to move by the pulley assembly;

[0039] The receiving plate mounting frame 11 includes a bracket 111, a support rod 112 and a top support 113. The upper end of the bracket 111 is connected to the support rod 112. The upper end of the support rod 112 is provided with a mounting head 114. The mounting head 114 is L-shaped and is provided with a bracket 115. The bracket 115 is used to install the receiving plate 5. The mounting head 114 and the receiving plate 5 are provided with matching connecting screw holes 51, and are equipped with a fixing knob 116. The fixing knob 116 is provided with a first screw rod 1161, and the first screw rod 1161 matches the connecting screw hole 51. The top support 113 is arched upward, and its upper end flatly supports the receiving plate 5. Four support rods 112 are connected to the four corners of the bracket 111, and the mounting heads 114 of the four support rods 112 are respectively connected to the four corners of the receiving plate 5, and the receiving plate 5 is assisted by the top support 113. Such an arrangement can significantly improve the installation stability and movement stability of the receiving plate 5; the mounting head 114 is provided with a bracket 115, which matches the corners of the receiving plate 5 and is tightened and fixed by a fixing knob 116 after pre-installation; the bracket 115 and the fixing knob 116 have a positioning and fixing function, so that the installation position of the receiving plate 5 remains constant, thereby ensuring the stability and accuracy of the jet; based on the detachable characteristics of the receiving plate 5, it is convenient to clean or replace it to keep no impurities mixed in after deposition, thereby improving the spinning effect.

[0040] The movable screw is an ordinary screw, including a screw motor, a screw, a ball nut, a ball nut seat and a connecting piece. The screw motor is connected to the screw, and the ball nut and the ball nut seat are connected to the screw. The ball nut and the ball nut seat are connected to each other, and a connecting piece is provided on the ball nut seat; the lower end of the receiving plate mounting frame 11 is connected to a main slider 117 and a secondary slider 118, the main slider 117 is connected to the connecting piece, and the secondary slider 118 is connected to both sides of the main slider 117; rollers 119 are provided on the main slider 117 and the secondary slider 118, and a roller track is provided in the opening 121 of the X-axis movable bracket 12, and the roller track matches the roller 119. The present invention provides a main slider 117 and a sub-slider 118 to guide the receiving plate mounting frame 11 to move in the X-axis direction, thereby increasing the contact area between the receiving plate mounting frame 11 and the X-axis movable bracket 12, so that the front and rear positions of the receiving plate mounting frame 11 are both affected by the force of the moving screw, which can significantly improve the stability of the movement; the roller 119 can reduce the friction generated during the movement and avoid problems such as jamming during movement.

[0041] The pulley assembly includes a pulley motor group 131, a main shaft 132 and a pulley group 133. The pulley motor group 131 uses a small motor and is connected to the main shaft 132 through a reducer. The main shafts 132 on both sides are respectively connected to a group of pulley groups 133. The pulley group 133 includes an active pulley 1331 and a driven pulley 1332. The active pulley 1331 and the driven pulley 1332 both slide on the pulley track 14, and the pulley track 14 is installed on the bottom plate 6. The pulley group 133 is used to drive the receiving plate 5 to move in the Y-axis direction. It is set on both sides of the Y-axis moving bracket 13 to cooperate with each other to realize the movement in the Y-axis direction. Both are evenly stressed and have strong bearing capacity. The friction of the pulley group 133 is small, and the movement is smooth, which can significantly improve the stability of the movement in the Y-axis direction.

[0042] The spinneret device 2 includes a spinning injector 23, an insulating sleeve 2 and an air heating assembly. The spinning injector 23 is installed in the insulating sleeve 2, and a heating chamber 27 is provided in the insulating sleeve 2. The air heating assembly is connected to the heating chamber 27. The spinning injector 23 is connected to a pneumatic device, which controls the jet speed.

[0043] The spinneret device 2 also includes a clamping lock cover 22, which consists of a left cover 222 and a right cover 221 that can be folded relative to each other, and a through hole 226 is formed between the left cover 222 and the right cover 221; a clamping notch 225 is provided in the clamping lock cover 22, and the clamping notch 225 matches the end of the spinning syringe 23. The surface of the clamping lock cover 22 is provided with an external thread, and the opening of the insulation sleeve 2 is provided with an internal thread, and the external thread matches the internal thread. The clamping lock cover 22 clamps the spinning syringe 23 and fixes it to the insulation sleeve 2. The clamping lock cover 22 is used to clamp the spinning syringe 23 and is fixed to the insulation sleeve 2 by means of threads, so as to achieve the purpose of installing the spinning syringe 23. The installation is firm and the disassembly is convenient. There is no need to touch the spinning syringe 23 to avoid burns. After the clamping lock cover 22 is tightened, the spinning syringe 23 is firmly installed in the insulation sleeve 2, without the need for an additional cover body, and there are no specific requirements for the internal structure of the insulation sleeve 2.

[0044] The left cover 222 and the right cover 221 are provided with finger rings 223, and the left cover 222 and the right cover 221 are controlled by the finger rings 223. A magnet sheet 1 (which is the same as a magnet sheet 224) is provided at the place where the left cover 222 contacts the right cover 221, and a magnet sheet 224 is provided at the place where the right cover 221 contacts the left cover 222. The magnet sheet 1 and the magnet sheet 224 match each other. The finger rings 223 facilitate the control of the left cover 222 and the right cover 221, and the magnet sheet 1 and the magnet sheet 224 provide magnetic attraction to achieve the purpose of pre-clamping, so that it is easy to screw the clamping lock cover 22 into the heat insulation sleeve 2, with a simple structure and ingenious design.

[0045] The air heating assembly includes an external circulating wind box 7, which includes a heating layer 71 and a circulating layer 72. The heating layer 71 is provided with an air inlet 75 and a heater is installed therein. The air inlet 75 is connected to the air outlet joint 25 of the heat-insulating sleeve 2 through an air pipe, and the heater heats the air flow passing through the heating layer 71; a fan 73 is installed in the circulating layer 72. Since the heating chamber 27 of the device is small in size, only a micro fan 73 is required, which provides a slow air flow speed, and the air flowing into or out of the heating chamber 27 is small, which meets the heating requirements of the present invention. Such a circulating bellows 7 also only needs to use a small bellows; the fan 73 is connected to the heating layer 71, and the circulating layer 72 is also provided with an air outlet 74, and the air outlet 74 is connected to the air inlet joint 24 of the insulation sleeve 2 through an air pipe; the insulation sleeve 2 is also provided with an air outlet channel 251 and an air inlet channel 241, the air outlet channel 251 is connected to the upper end position of the heating chamber 27, and the air inlet channel 241 is connected to the lower end position of the heating chamber 27, which can ensure that the incoming airflow passes through the entire heating chamber 27; the air outlet channel 251 is connected to the air outlet joint 25, and the air inlet channel 241 is connected to the air inlet joint 24. The present invention adopts air heating to heat the spinning injector 23, and keeps the temperature of the heating chamber 27 at the set temperature in a circulating manner; the principle is as follows: driven by the fan 73, the air circulates back and forth in the order of the heating chamber 27-air outlet channel 251-circulating bellows 7-air inlet channel 241-heating chamber 27, flows through the heating layer 71 to replenish heat for it, and heats it to the set temperature, and then flows back to the heating chamber 27 through the fan 73, and repeats the process until the spinning is completed; the air heating method is easy to control, and can keep the temperature of the heating chamber 27 at the set temperature at all times, the heating air is in direct contact with the spinning injector 23, the heat transfer effect is significant, and the polymer always remains in a molten state; the internal structure of the insulation sleeve 2 is simplified, and there is no need to set a heating collar.

[0046] The upper and lower ports of the heating chamber 27 are both provided with sealing rubber sleeves 271 ; the heat insulating sleeve 2 includes an inner heat conducting layer 212 and an outer heat insulating layer 211 .

[0047] An alligator clip 28 is installed at the needle of the spinning syringe 23, and the alligator clip 28 is connected to a voltage device so as to apply a certain voltage to the needle.

[0048] The heat-insulating sleeve 2 is provided with a probe hole 26, and a temperature-sensing rod probe is installed in the probe hole 26. The aperture of the probe hole 26 is the same as the diameter of the temperature-sensing rod probe, and the temperature-sensing rod probe can be inserted into the vicinity of the needle of the spinning injector 23 through the probe hole 26, which is conducive to the temperature monitored by the temperature-sensing rod probe to be consistent with the actual temperature of the needle of the spinning injector 23.

[0049] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A stable melt near-field direct writing device, comprising a spinneret device and a receiving device, characterized in that: The receiving device comprises a receiving plate, a receiving plate mounting frame, an X-axis movable bracket and a Y-axis movable bracket, the receiving plate is mounted on the receiving plate mounting frame, the receiving plate mounting frame is connected to the X-axis movable bracket, a movable screw is installed in the X-axis movable bracket, and the receiving plate mounting frame is driven to move by the movable screw; the X-axis movable bracket is connected to the Y-axis movable bracket, and the Y-axis movable bracket is installed with a pulley assembly, and the pulley assembly slides on a matching pulley track, and the Y-axis movable bracket is driven to move by the pulley assembly; the receiving plate mounting frame comprises a bracket, a support rod and a top support, the upper end of the bracket is connected to the support rod, the upper end of the support rod is provided with a mounting head, the mounting head is L-shaped and is provided with a bracket, the bracket is used to mount the receiving plate, the mounting head and the receiving plate are provided with matching connecting screw holes, and are equipped with a fixing knob, the fixing knob is provided with a first screw, the first screw is connected to the connecting screw hole Match each other; the top support arches upward, and its upper end flat supports the receiving plate; the moving screw comprises a screw motor, a screw, a ball nut, a ball nut seat and a connecting piece, the screw motor is connected to the screw, the screw is connected to the ball nut and the ball nut seat, the ball nut and the ball nut seat are mutually connected, and the connecting piece is provided on the ball nut seat; the lower end of the receiving plate mounting frame is connected to a main slider and a secondary slider, and the main slider is connected to the connecting piece; rollers are provided on the main slider and the secondary slider, and a roller track is provided in the through opening of the X-axis movable bracket, and the roller track matches the roller; the pulley assembly comprises a pulley motor group, a main shaft and a pulley group, the pulley motor is connected to the main shaft on both sides, and the main shafts on both sides are respectively connected to a group of pulley groups, the pulley group comprises an active pulley and a driven pulley, and the active pulley and the driven pulley both slide on the pulley track; The spinneret device comprises a spinning injector, a heat-insulating sleeve and an air heating assembly, wherein the spinning injector is installed in the heat-insulating sleeve, and a heating chamber is provided in the heat-insulating sleeve, and the air heating assembly is connected to the heating chamber; the spinneret device also comprises a clamping lock cover, wherein the clamping lock cover is composed of a left cover and a right cover which can be folded relative to each other, and a through hole is formed between the left cover and the right cover; a clamping notch is provided in the clamping lock cover, wherein the clamping notch matches the end of the spinning injector, an external thread is provided on the surface of the clamping lock cover, an internal thread is provided at the opening of the heat-insulating sleeve, wherein the external thread matches the internal thread, and the clamping lock cover clamps the spinning injector and fixes it to the heat-insulating sleeve; the left cover and the right cover are provided with finger rings, wherein the left cover and the right cover are controlled by the finger rings, wherein a magnet sheet 1 is provided at the place where the left cover contacts the right cover, and a magnet sheet 2 is provided at the place where the right cover contacts the left cover, and the magnet sheet 1 matches the magnet sheet 2.

2. A stable melt near-field direct writing device according to claim 1, characterized in that: The air heating component includes an external circulating bellows, which includes a heating layer and a circulating layer. The heating layer is provided with an air inlet and a heater is installed inside the heating layer. The air inlet is connected to the air outlet joint of the thermal insulation sleeve through an air pipe, and the heater heats the air flow passing through the heating layer; a fan is installed in the circulating layer, and the fan is connected to the heating layer. The circulating layer is also provided with an air outlet, and the air outlet is connected to the air inlet joint of the thermal insulation sleeve through the air pipe; the thermal insulation sleeve is also provided with an air outlet channel and an air inlet channel, both of which are connected to the heating chamber, the air outlet channel is connected to the air outlet joint, and the air inlet channel is connected to the air inlet joint.

3. A stable melt near-field direct writing device according to claim 2, characterized in that: The upper port and the lower port of the heating chamber are both provided with sealing rubber sleeves; the heat-insulating sleeve comprises an inner heat-conducting layer and an outer heat-insulating layer.

4. A stable melt near-field direct writing device according to claim 1, characterized in that: An alligator clip is installed at the needle of the spinning syringe, and the alligator clip is connected to a voltage device.

5. A stable melt near-field direct writing device according to claim 1, characterized in that: The upper barrel end of the spinning syringe is connected with a pneumatic device, through which polymer extrusion is controlled; the heat-insulating sleeve is provided with a probe hole, in which a temperature-sensing rod probe is installed.

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