Preparation device for manufacturing 3D printing wires through recycled PET plastic bottles

Abstract

The utility model provides a preparation device for manufacturing 3D printing wires through recycled PET plastic bottles. The preparation device comprises a cutting system, a molding system, a broken wire connecting system and a winding system which are arranged in sequence. The cutting system is used for cutting the plastic bottles into continuous slender plastic strips with fixed width; the cutting system comprises a base and a wire stroking device which are fixed on the platform, a support rod, a width controller and a blade are fixed on the base, and a pair of clamping rollers are respectively supported on the base through shaft columns; the wire stroking device is provided with a stroking groove used for stroking a plastic strip, the width controller is provided with a bottom supporting groove used for being embedded into and supporting the bottom edge of a plastic bottle body, the extending direction of the bottom supporting groove is the same as the extending direction of the stroking groove, the gap between the two clamping rollers is located in the direction, and the cutting edge of the blade intersects with the direction in an inclined mode. The maximum width of the cut plastic strip is determined by the distance between the groove bottom of the bottom supporting groove and the cutting edge of the blade, and the distance is defined as the cutting limiting width.

Description

Technical Field

[0001] The utility model belongs to the field of 3D printing consumables manufacturing equipment, and in particular relates to a preparation device for manufacturing 3D printing filaments by utilizing recycled PET plastic bottles. Background Art

[0002] At present, the preparation method of fused deposition modeling (FDM) 3D printing filaments is mainly based on screw extrusion of powdered or granular raw materials such as ABS and PLA. Extrusion molding technology is an early polymer processing technology. It is a molding technology that heats the material to a molten state at a high temperature, and uses the extrusion effect formed by the rotation of the screw to push the molten material through the die and form a filament similar to the shape of the die. However, screw extrusion filament making equipment has the defects of complex and numerous components and high cost. At the same time, the price of common 3D printing consumables on the market is also relatively expensive, which greatly increases the cost of 3D printing.

[0003] With the rapid popularization of the concept of global sustainable development and circular economy, the plastic recycling industry is experiencing significant growth. Among the many plastic materials, PET plastic bottles are less susceptible to contamination than HDPE, LDPE, PP, PS, PVC and other materials due to their material characteristics, basically no specific adhesion coating, and easy to accurately sort, showing excellent recycling advantages. Utility Model Content

[0004] In view of this, based on the excellent performance of PET plastic bottles, this utility model proposes a preparation device for 3D printing filaments made from recycled PET plastic bottles, bringing 3D printing filament preparation technology into the field of environmental innovation, and adding a new environmentally friendly option for filaments for 3D printing by material extrusion (ME). The technical solution of this utility model is as follows:

[0005] A preparation device for making 3D printing filaments using recycled PET plastic bottles, comprising a cutting system, a shaping system, a broken wire connection system, and a winding system sequentially arranged on a main frame;

[0006] The cutting system is fixed to a base and a wire straightener on a platform, a support rod, a width controller and a blade are fixed on the base, and a pair of clamping rollers are supported on the base through shaft columns respectively; the wire straightener is provided with a straightening groove for straightening the plastic strip, and the width controller is provided with a supporting groove for embedding and supporting the bottom edge of the plastic bottle body, the extension direction of the supporting groove is the same as the extension direction of the straightening groove, and the gap between the two clamping rollers is located in this direction, and the blade of the blade is inclined to intersect with this direction; the distance between the bottom of the supporting groove and the blade of the blade determines the maximum width of the cut plastic strip, and this distance is defined as the cutting limit width.

[0007] Furthermore, the rotation axis lines of the two clamping rollers and the rod center line of the support rod are located in the same vertical plane, the blade is located between the width controller and the two clamping rollers in the vertical direction, and the width controller, the blade, the two clamping rollers and the wire drawer are arranged in sequence in the horizontal direction of the plastic strip.

[0008] Furthermore, the support rod is inclined toward the two clamping rollers.

[0009] Furthermore, the cutting system also includes a counterweight cylinder, which is fixedly provided with a wire ring, and a wire ring is also fixedly connected to the cutting table. The two ends of the elastic telescopic rope are respectively connected to the wire ring on the cylinder body and the wire ring on the cutting table. The elastic telescopic rope is used to enhance the downward pressure on the counterweight cylinder, thereby enhancing the downward pressure on the PET plastic bottle mounted on the support rod.

[0010] Furthermore, the shaping system includes a heating nozzle, and the heating nozzle adopts an extrusion nozzle of a 3D printer.

[0011] Furthermore, the broken wire connection system includes an extruder, a shear and a welder arranged in sequence along the extension direction of the guide rail, and the guide rail is provided with a guide groove for accommodating and providing guidance for the wire; the housing of the extruder is provided with an inlet and an outlet for the wire to enter and exit, and a motor is fixedly connected to the housing, and a driving gear, a reduction gear and a guide groove wheel are rotatably connected in the housing, and an annular guide groove is formed on the circumference of the guide groove wheel body, the motor is connected to drive the driving gear, the driving gear is meshed with the reduction gear, and the reduction gear is coaxially fixed with the extrusion gear, and the wire input from the inlet of the housing can be clamped between the gear teeth of the extrusion gear and the guide groove of the guide groove wheel.

[0012] Furthermore, the shearer includes a stepper motor and a guide column respectively fixed on both sides of the guide rail, the motor shaft of the stepper motor is parallel to the axis of the guide column, an eccentric wheel is provided on the motor shaft, the shearing knife is fixed on the tool holder, a large slot holder and a small slot holder are respectively fixed at both ends of the tool holder, the eccentric wheel is slidably matched with the slot of the large slot holder, and the guide column is slidably matched with the slot of the small slot holder; an avoidance opening that crosses the guide groove is opened on the guide rail directly below the shearing knife.

[0013] Furthermore, the welder includes a second stepper motor fixed on the bracket, the motor shaft of the second stepper motor is coaxially fixedly connected to the rotating shaft of the cam, the lifting column is connected to the bracket sliding guide, the top of the lifting column is abutted against the cam, and the lifting column sleeve is provided with a reset spring for providing an upward reset force for the lifting column; a heating rod is fixedly connected to the bottom end of the lifting column, a fixed welding table is provided under the heating rod, a welding area through hole and a wire passing hole which are vertically connected to each other are opened on the welding table, the welding area through hole is opposite to the heating rod, a section of welding guide rail is fixed in the welding area through hole, and the guide groove of the welding guide rail is colinear with the wire passing hole.

[0014] Furthermore, an air cooling device is provided after the welder for air cooling the melted wire material after welding.

[0015] Furthermore, the winding system includes a guide roller and a winding drum.

[0016] The utility model has low silk making cost. The raw material for silk making is discarded PET plastic bottles. The raw material source is wide and cheap, which can not only reduce the silk making cost, but also make full use of waste resources, promoting the diversification of plastic recycling industry; according to task requirements, different diameters of wires can be produced by replacing nozzles, which meets the diversified 3D printing needs and increases the applicability and market competitiveness of the device; the wires made from multiple plastic bottles can be welded into the same wire, which solves the problem of small wire output and low utilization rate of a single plastic bottle; the structure has high reliability and adopts the idea of ​​modular production and design, which is convenient for replacing parts and repairing the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0018] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is an exploded schematic diagram of the cutting system;

[0020] Figure 3 for Figure 2 An enlarged schematic diagram of the dotted circle portion;

[0021] Figure 4 for Figure 1 An enlarged schematic diagram of the middle shaping system 2;

[0022] Figure 5 for Figure 1 An enlarged schematic diagram of the middle extruder 31;

[0023] Figure 6 It is a schematic diagram of the structure inside the extruder housing;

[0024] Figure 7 is a three-dimensional schematic diagram of the shearing device from another perspective;

[0025] Figure 8 A perspective schematic diagram of a welding machine and a winding system from another perspective;

[0026] Fig. 9 It is the combination and explosion diagram of the welding table and welding guide rail. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] As shown in the figure, the main hardware structure of the utility model is composed of a cutting system 1, a shaping system 2, a broken wire connecting system 3, and a winding system 4 which are arranged on a main frame 6 in sequence.

[0030] The cutting system 1 is a pre-processing part for plastic bottles, and can cut the plastic bottles into continuous elongated plastic strips with a fixed width.

[0031] The molding system 2 is the 3D printing filament molding part. The plastic strips transmitted from the cutting system are molded into filaments through heating and extrusion.

[0032] The broken wire connection system 3 can connect two discontinuous wires into one continuous formed wire and provide power for the cutting system to continue working.

[0033] The winding system 4 is a part for collecting the formed wire material, and fixes the formed and cooled hollow filamentary wire material on the reel for collection.

[0034] Combination Figure 1 , Figure 2 and Figure 3 As shown, the cutting system 1 includes a platform 10, on which a base 11 and a threader 14 are fixed, on which a support rod positioning cylinder 111, a width controller 114 and a blade 113 are fixed, and a support rod 12 for fitting the plastic bottle 7 is sleeved on the support rod positioning cylinder 111 through its bottom end, so that the support rod 12 is erected on the base 11; a pair of clamping rollers 112 are also supported on the base 11 through shaft columns, respectively, and the rotation axis of the two clamping rollers 112 and the rod center line of the support rod 12 are located in the same vertical plane, in the vertical direction, the blade 113 is located between the width controller 114 and the two clamping rollers 112, and in the horizontal direction of the plastic strip, the width controller 114, the blade 113, the two clamping rollers 112 and the threader 14 are arranged in sequence;

[0035] The wire straightener 14 is provided with a straightening groove 141 for straightening the plastic strip, and the width controller 114 is provided with a supporting groove 1141 for embedding and supporting the bottle wall of the plastic bottle 7, and the extension direction of the supporting groove 1141 is in the same direction as the extension direction of the straightening groove 141, and the gap between the two clamping rollers 112 is located in this direction, and the blade of the blade 113 is obliquely intersected with this direction; the distance between the bottom of the supporting groove 1141 and the blade of the blade 113 determines the maximum width of the cut plastic strip, and this distance is defined as the cutting limit width.

[0036] Preferably, the support rod 12 is tilted on the base 11 and is tilted toward the two clamping rollers 112 so that the plastic bottles placed thereon can be cut better.

[0037] Preferably, a wire ring 131 is fixedly provided on the cylinder body of the counterweight cylinder 13, and a wire ring 15 is also fixedly connected to the cutting table 11. The two ends of the elastic telescopic rope (not shown in the figure) are respectively connected to the wire ring 131 on the cylinder body and the wire ring 15 on the cutting table. The elastic telescopic rope is used to enhance the downward pressure of the counterweight cylinder, thereby applying a downward pressure formed by the superposition of the weight of the counterweight cylinder itself and the retraction force of the elastic telescopic rope to the PET plastic bottle 7 on the support rod 12, which is beneficial to the subsequent cutting of the PET plastic bottle.

[0038] Combination Figure 1 and Figure 4 As shown, the shaping system 2 includes a heating nozzle 21, which is fixed to an iron plate bracket 22 by screws, and the iron plate bracket 22 is fixed to a nozzle bracket 23. The iron plate bracket 22 raises the heating nozzle 21 by a certain distance to prevent the nozzle bracket 23 from being melted by the high temperature of the heating nozzle 21.

[0039] The heating nozzle 21 can be replaced by a disassembled extrusion nozzle of a common 3D printer. Note that nozzles of different calibers must be replaced according to the production of wires of different diameters.

[0040] Combination Figure 1 , Figures 5 to 9 As shown, the broken wire connection system 3 includes an extruder 31, a shear 32 and a welder 36 arranged in sequence along the extension direction of the guide rail 30, and the guide rail 30 is provided with a guide groove 301 for accommodating and providing guidance for the wire;

[0041] Extruder 31, the shell of extruder 31 is provided with an inlet and an outlet for wire material to enter and exit, a motor 31 is fixedly connected to the shell, and a driving gear 312, a reduction gear 313 and a guide groove wheel 315 are rotatably connected in the shell respectively, and an annular guide groove is formed on the circumference of the wheel body of the guide groove wheel 315, the motor 31 is connected to drive the driving gear 312, the driving gear 312 is meshed with the reduction gear 313 to achieve speed reduction and torque increase, and the reduction gear 313 is coaxially fixed with an extrusion gear 314, the wire material input from the inlet of the shell is clamped between the gear teeth of the extrusion gear 314 and the guide groove of the guide groove wheel 315, and the wire material is extruded from the outlet of the shell through the rotation of the extrusion gear 314 and the guide groove wheel 315.

[0042] Preferably, a first material break sensor 331 is provided before the inlet of the extruder 31 , and a second material break sensor is provided between the outlet of the extruder 32 and the shear 32 .

[0043] See also Figure 7As shown, the shearing device 32 comprises a stepping motor 321 and a guide column 323 respectively fixed on both sides of the guide rail 30, the motor shaft 3211 of the stepping motor 321 is parallel to the axis of the guide column 323, an eccentric wheel 322 is provided on the motor shaft 321, a shearing knife 327 is fixed on a tool holder 326, a large notch frame 324 and a small notch frame 323 are respectively fixedly connected at both ends of the tool holder 326, the eccentric wheel 322 is slidably fitted in the notch of the large notch frame 324, and the guide column 323 is slidably fitted in the notch of the small notch frame 325. When the stepper motor 321 starts working, the eccentric wheel 322 rotates in the slot of the large slot frame 324, and under the cooperation of the sliding guide of the guide column 323 and the small slot frame 325, it drives the tool frame 326 and the shearing knife 327 fixed thereunder to pitch and flip up and down within a certain angle range. An avoidance opening 302 that crosses the guide groove 301 is opened on the guide rail directly below the shearing knife 327, so that the shearing knife 327 can fall and cut the wire material on the guide groove 301 of the guide rail 30.

[0044] See also Figure 8 As shown, the welder 36 comprises a second stepper motor 341 fixed on a bracket 361, the motor shaft of the second stepper motor 341 is coaxially fixedly connected with the rotating shaft of the cam 342, the lifting column 362 is slidably guided and connected with the bracket 361, the top of the lifting column 362 is in contact with the cam 342, the lifting column 362 is sleeved with a reset spring 363, the reset spring 363 provides an upward reset elastic force for the lifting column, and the cam 342 provides a downward pressure for the lifting column 362; the bottom end of the lifting column 363 is fixedly connected with a heating rod 35, and a fixed welding platform 364 is provided below the heating rod 35, combined with Fig. 9 As shown, the welding table 364 is provided with a welding area through hole 3641 and a wire through hole 3642 which are perpendicular to each other. The welding area through hole 3641 is opposite to the heating rod 35. A section of welding guide rail 30a is fixed in the welding area through hole 3641. The guide groove of the welding guide rail 30a is colinear with the wire through hole 3642.

[0045] When this part starts working, the second stepper motor 341 drives the cam 342 to rotate, and the cam 342 pushes the lifting column 362 below to descend, thereby driving the heating rod 35 to fall. The two ends of the wire to be welded are attached to the guide groove of the welding guide rail 30a. When the heating rod 35 falls, it can cover the two ends of the wire to be welded and melt them. As the cam rotates, the heating rod 35 is lifted up by the return spring 363 to stop welding.

[0046] Preferably, a third material break sensor 333 is provided before the welder 36.

[0047] Preferably, an air cooling device 38 for air cooling the molten wire after welding is provided after the welder 36. The air cooling device can be a common small fan in combination with a guide cover, which will not be described in detail herein.

[0048] See also Figure 8 As shown, the winding system 4 includes a guide roller 44 and a winding drum 43. The formed wire passes through the guide roller 44 and is tied and fixed in a small hole on the side of the winding drum 43. Then, the stepper motor 41 drives the gear set to provide power to rotate the winding drum 43 to store the wire. At the same time, it can also be transmitted through the wire to provide auxiliary power for the cutting system to continue cutting the plastic bottles.

[0049] The electric control system 5 of the present invention includes a switching power supply, a main board, and a display screen, which are placed inside the main frame 6. The temperature control and motor control of the entire process are not the design focus of the present invention, and will not be described in detail herein.

[0050] Working principle:

[0051] After washing and drying the PET plastic bottle, cut off the unusable bottom part of the bottle in advance, and keep the relatively soft bottle body part in the middle. Cut a plastic strip with a certain width (the initial width should be less than the cutting limit width) and a certain length (the initial length should be at least 12-15 cm) along the bottom of the bottle body. At this time, the plastic strip is still connected to the bottle body. Put the plastic bottle on the support rod 12, cover the counterweight cylinder 13, and tie the two ends of the elastic telescopic rope (not shown in the figure) to the wire ring 131 on the cylinder body and the wire ring 15 on the cutting table respectively, and use the elastic telescopic rope to increase the downward pressure of the counterweight cylinder.

[0052] The plastic strip passes through the bottom support groove 1141 of the width controller 114, and then passes under the blade 113, and the bottom edge of the plastic bottle 7 on the support rod 12 is clamped between the two clamping rollers 112. The plastic strip continues to move forward after passing through the wire drawing device 14.

[0053] After passing through the heating nozzle 21 of the shaping system 2 (the nozzle is not heated at this time), the front end of the plastic strip is pulled out of the nozzle and clamped, and then the temperature of the nozzle is raised to 220-230°C, and the wire is clamped with pliers, and a pulling force is applied to pull the wire out of the heating nozzle 21, and the cutting system 1 is driven to cut the plastic bottle, and the wire is passed through the material breaking sensor 331 and the extruder 31 in sequence. At this time, the extruder 31 provides traction for the wire to move forward, and then the wire passes through the welder 36 along the guide rail and goes to the winding system 4 until it is fixed on the winding drum 43. The stepper motors of the extruder 31 and the winding system 4 jointly provide the main power for the wire movement. The PET plastic bottle can be recycled to produce hollow 3D printing wire.

[0054] Working principle of broken wire connection system:

[0055] The wire pulled out from the first plastic bottle A is called A wire. When plastic bottle A is used up (or A wire is broken), the tail end of A wire will pass through the first break sensor 331 and the second break sensor in sequence. When the second break sensor recognizes the "no wire" state for the first time, the stepper motor 41 of the winding system 4 will stop after running a certain distance D1, so that the tail end of A wire just stops in the working area of ​​the welder 36 waiting for welding.

[0056] Then, the heating rod 35 starts to heat to 300-350°C (enough to melt the PET plastic wire) and waits for operation. The second plastic bottle undergoes the same wire drawing process, and the wire drawn from it is called B wire.

[0057] When the head end of the B wire passes through the first material-breaking sensor 331 and enters the extruder 31, the first material-breaking sensor 331 records the initial signal +1, and the extruder 31 provides power for the B wire. After waiting for a fixed time T, the shear 32 is started to cut off the unqualified part of the B wire. The shear 32 and the third material-breaking sensor 33 leave a gap for the cut unqualified wire to fall through. Since the length of the unqualified wire is almost fixed when the plastic bottle is initially working, it can be known from experimental experience that after this shearing operation is performed 2 to 3 times, the B wire is formed to be qualified.

[0058] After the shear 32 works for the last time, the extruder 31 will run for a certain distance D2 and then stop, so that the first section of the B wire pushes the tail end of the A wire forward by 1 to 2 mm. At this time, the tail end of the A wire and the first section of the B wire are in contact with each other and are still within the working range of the welding area through hole 3641 of the welder 36.

[0059] At the same time, the heating rod 35 is also heated, and the cam 342 begins to rotate driven by the motor 341, pushing the heating rod 35 downward into the welding area through hole 3641, and the lower heating head of the heating rod 35 presses the tail end of the A wire and the front section of the B wire. After a certain period of time, the tail end of the A wire and the front section of the B wire are partially melted, and the heating rod 35 is lifted by the return spring 363, and then the stepper motors of the extruder 31 and the winding system are started. The tail end of the A wire and the first section of the B wire will be cooled by the air cooling device set at the tail of the welder 36, so that the A wire and the B wire are finally welded into the same wire.

[0060] The third wire break sensor can be used to check whether the broken wire is welded successfully.

[0061] When the plastic bottle B is exhausted, the above process is repeated to obtain continuous, multi-bottle 3D printing plastic filament.

[0062] The above is the working principle of the broken wire connection system.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation device for making 3D printing filaments using recycled PET plastic bottles, characterized in that: It includes a cutting system, a shaping system, a broken wire connection system, and a winding system which are sequentially arranged on the main frame; The cutting system is fixed to a base and a wire straightener on a platform, a support rod, a width controller and a blade are fixed on the base, and a pair of clamping rollers are supported on the base through shaft columns respectively; the wire straightener is provided with a straightening groove for straightening the plastic strip, and the width controller is provided with a supporting groove for embedding and supporting the bottom edge of the plastic bottle body, the extension direction of the supporting groove is the same as the extension direction of the straightening groove, and the gap between the two clamping rollers is located in this direction, and the blade of the blade is inclined to intersect with this direction; the distance between the bottom of the supporting groove and the blade of the blade determines the maximum width of the cut plastic strip, and this distance is defined as the cutting limit width.

2. A preparation device for making 3D printing filaments using recycled PET plastic bottles according to claim 1, characterized in that: The rotation axis of the two clamping rollers and the center line of the support rod are located in the same vertical plane. In the vertical direction, the blade is located between the width controller and the two clamping rollers. In the horizontal direction of the plastic strip, the width controller, the blade, the two clamping rollers and the wire drawer are arranged in sequence.

3. The device for preparing 3D printing filaments by using recycled PET plastic bottles according to claim 1, characterized in that: The support rod is inclined toward the two clamping rollers.

4. The device for preparing 3D printing filaments by using recycled PET plastic bottles according to claim 1, characterized in that: The cutting system also includes a counterweight cylinder, which is fixedly provided with a wire ring, and a wire ring is also fixedly connected to the cutting table. The two ends of the elastic telescopic rope are respectively connected to the wire ring on the cylinder body and the wire ring on the cutting table. The elastic telescopic rope is used to increase the downward pressure on the counterweight cylinder, thereby increasing the downward pressure on the PET plastic bottle mounted on the support rod.

5. The device for preparing 3D printing filaments by using recycled PET plastic bottles according to claim 1, characterized in that: The shaping system comprises a heating nozzle, and the heating nozzle adopts an extrusion nozzle of a 3D printer.

6. The device for preparing 3D printing filaments by using recycled PET plastic bottles according to claim 1, characterized in that: The broken wire connection system includes an extruder, a shear and a welder arranged in sequence along the extension direction of the guide rail, and the guide rail is provided with a guide groove for accommodating and guiding the wire; the housing of the extruder is provided with an inlet and an outlet for the wire to enter and exit, and a motor is fixedly connected to the housing, and a driving gear, a reduction gear and a guide groove wheel are rotatably connected in the housing, and an annular guide groove is formed on the circumference of the guide groove wheel body, the motor is connected to drive the driving gear, the driving gear is meshed with the reduction gear, and the reduction gear is coaxially fixed with the extrusion gear, and the wire input from the inlet of the housing can be clamped between the gear teeth of the extrusion gear and the guide groove of the guide groove wheel.

7. The device for preparing 3D printing filaments by using recycled PET plastic bottles according to claim 6, characterized in that: The shearing device comprises a stepping motor and a guide column respectively fixed on both sides of the guide rail, the motor shaft of the stepping motor is parallel to the axis line of the guide column, an eccentric wheel is arranged on the motor shaft, the shearing knife is fixed on the tool holder, a large slot holder and a small slot holder are respectively fixed on both ends of the tool holder, the eccentric wheel is slidably matched with the slot of the large slot holder, and the guide column is slidably matched with the slot of the small slot holder; an avoidance opening which crosses the guide slot is opened on the guide rail directly below the shearing knife.

8. The device for preparing 3D printing filaments using recycled PET plastic bottles according to claim 6, characterized in that: The welder includes a second stepper motor fixed on the bracket, the motor shaft of the second stepper motor is coaxially fixedly connected to the rotating shaft of the cam, the lifting column is connected to the bracket sliding guide, the top of the lifting column is in contact with the cam, and the lifting column sleeve is provided with a reset spring that provides an upward reset elastic force for the lifting column; a heating rod is fixedly connected to the bottom end of the lifting column, and a fixed welding platform is provided below the heating rod, and a welding area through hole and a wire passing hole that are vertically connected to each other are opened on the welding platform, the welding area through hole is opposite to the heating rod, and a section of welding guide rail is fixed in the welding area through hole, and the guide groove of the welding guide rail is colinear with the wire passing hole.

9. The device for preparing 3D printing filaments using recycled PET plastic bottles according to claim 8, characterized in that: An air cooling device is provided after the welder for cooling the melted wire material by air.

10. The device for preparing 3D printing filaments using recycled PET plastic bottles according to claim 1, characterized in that: The winding system includes a guide roller and a winding drum.

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