A 3D printer wire transmission mechanism and wire feeding method thereof

Abstract

The present invention discloses a 3D printer wire transmission mechanism, wherein a wire box is provided with wire for supplying wire to a nozzle, and the wire is transmitted to the nozzle through a power system, wherein the power system comprises a wire pushing device near one end of the wire box, a wire pulling device near one end of the nozzle, and a wire buffer device arranged between the wire pushing device and the wire pulling device. The wire feeding method is as follows: the wire pushing device stops operating after pushing a section of wire to the wire buffer device, and the wire pulling device continues to operate to pull the wire, and when the wire in the wire buffer device is tightened, the wire pushing device continues to push a section of wire to the wire buffer device. The present invention arranges a wire buffer device between the wire pushing device and the wire pulling device, wherein the wire pushing device provides thrust in a gap, and the wire pulling device continuously provides pulling force, and the two devices can continuously produce wire without synchronous operation, thereby improving the printing quality.

Description

Technical Field

[0001] The invention belongs to the field of 3D printers, and in particular relates to a 3D printer wire material transmission mechanism and a wire feeding method thereof. Background Art

[0002] The FDM (fused deposition modeling) 3D printer heats the print head at high temperature to melt the filament and deposit it onto the printing platform. When the molten filament contacts the printing platform, it cools and quickly solidifies. The print head deposits the filament layer by layer onto the printing platform along a set printing path, thereby constructing a model with a three-dimensional structure.

[0003] The filament box of a large FDM 3D printer is installed at the bottom of the 3D printer, and the printer nozzle is installed at the top of the 3D printer. The filament needs to be driven by a motor to print layer by layer onto the printing platform. Usually the motor is installed in the printer nozzle, but due to the large size of large FDM 3D printers, the distance from the filament box to the printer nozzle is far, and the resistance of the filament in the pipeline is large, and one motor may not be able to pull the filament. At this time, it is necessary to set a second motor at the bottom of the 3D printer to provide thrust to pull the filament.

[0004] However, setting up two motors in a 3D printer to pull the filament will encounter the following problems: the two motors must operate synchronously. If the two motors do not operate synchronously, it will cause problems with the filament output, resulting in unstable printing and may even cause printing failure. Summary of the invention

[0005] The purpose of the present invention is to provide a 3D printer wire transmission mechanism and a wire feeding method thereof, wherein a wire buffer device is arranged between a wire pushing device and a wire pulling device, the wire pushing device provides thrust in the gap, and the wire pulling device continuously provides pulling force, and the wire pushing device and the wire pulling device can continuously output wire without synchronous operation, thereby improving printing quality.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A 3D printer wire transmission mechanism includes a wire box and a nozzle. The wire box contains wire for supplying wire to the nozzle. The wire is transmitted to the nozzle through a power system. The power system includes a wire pushing device near one end of the wire box, a wire pulling device near one end of the nozzle, and a wire buffer device arranged between the wire pushing device and the wire pulling device. The wire buffer component divides the wire into two sections for transmission. The wire pushing device stops operating after pushing a section of wire to the wire buffer device, and the wire pulling device continues to operate to pull the wire. When the wire in the wire buffer device is taut, the wire pushing device continues to push a section of wire to the wire buffer device. The setting of the wire buffer device allows the wire pushing device and the wire pulling device to continuously produce wire without synchronous operation, thereby improving the printing quality.

[0008] Furthermore, the wire buffer device includes a wire inlet, a feeding channel and a wire outlet, and a sensor is arranged in the feeding channel, and the sensor is used to sense the state of the wire. After the wire enters the feeding channel from the wire inlet, it extends out from the wire outlet. After the sensor senses the different states of the wire, it transmits information to the main board, and the main board controls the gap operation of the wire pushing device, and pushes a section of the wire into the wire buffer device when the wire is taut.

[0009] Furthermore, the sensor includes a triggering part and a sensing part, wherein the triggering part is used to sense the state of the wire being tightened or relaxed, and the sensing part is used to receive the state of the triggering part. The sensing part senses the state change of the triggering part and transmits the information to the main board.

[0010] Furthermore, the trigger part has a first state and a second state. When the wire material changes from being relaxed to being taut, the trigger part changes from the first state to the second state. When the wire material changes from being taut to being relaxed, the trigger part changes from the second state to the first state. In the first state, the wire pushing device feeds the wire and the wire pulling device stops working. In the second state, the wire pulling device pulls the wire and the wire pushing device stops working. The different states of the wire material change the state of the trigger part. After the sensing part senses the change of the trigger part, it transmits the information to the main board. The main board controls the operation of the wire pushing device, so that when the wire material is taut, the wire pushing device delivers a section of wire to the wire buffer device.

[0011] Furthermore, the trigger part and the sensor part are mounted on the bottom plate, the trigger part is an eccentric structure, the eccentric structure rotates on the bottom plate, one end of the eccentric structure contacts the sensor part, and the other end of the eccentric structure contacts the feeding channel, the sensor part is a photoelectric sensor, the photoelectric sensor is provided with an upper sensor head and a lower sensor head, the turntable is provided with a turntable opening, and the turntable opening is located between the upper sensor head and the lower sensor head. When the turntable is in the original position under the gravity of the eccentric wheel, the turntable opening is located between the upper sensor head and the lower sensor head, and the light between the upper sensor head and the lower sensor head passes through the turntable opening; when the wire material drives the turntable to rotate upward, the turntable rotates to block the light between the upper sensor head and the lower sensor head, and the photoelectric sensor detects that the light is intercepted, thereby transmitting a signal to the main board. The wire material in the feeding channel changes from loose to tight. The tight wire material touches the eccentric structure, and the eccentric structure rotates upward. The photoelectric sensor detects the rotation of the eccentric structure, and the sensor transmits a signal to the main board. The main board provides a signal to the wire pushing device. The wire pushing device continues to push a section of wire upward. The wire material moves from the outside to the inside of the feeding channel, and the eccentric structure falls back downward. The photoelectric sensor detects the rotation of the eccentric structure and transmits a signal to the main board. The main board provides a signal to the wire pushing device. The wire pushing device stops operating and the above actions are repeated.

[0012] Furthermore, the feeding channel is crescent-shaped, and is provided with an outer ring and an inner ring. The inner ring is provided with an inner ring opening. The eccentric structure includes a turntable, an eccentric wheel and a rotating shaft. The rotating shaft runs through the turntable and the eccentric wheel. One end of the turntable contacts the sensor, and the other end of the turntable seals the inner ring opening. When the wire is continuously pulled by the wire pulling device, the wire moves toward the inner ring and drives the turntable to rotate upward around the rotating shaft; when the wire is pushed by the wire pushing device, the wire moves toward the outer ring. At this time, the turntable falls back under the gravity of the eccentric wheel and seals the inner ring opening. The sensor can sense the rotation of the turntable and transmit a signal to the main board. The eccentric structure enables the sensor to accurately sense the situation of the wire in the feeding channel, so that the main board starts or shuts down the wire pushing device.

[0013] Furthermore, a protrusion is provided at one end of the turntable that seals the inner ring opening, a first limit block is provided on the bottom plate, the top of the first limit block matches the bottom of the protrusion, the outer periphery of the protrusion is in an arc shape, and a second limit block is provided on the bottom plate, the second limit block abuts against the top of the protrusion. The first limit block abuts against the protrusion, so that the turntable can seal the inner ring opening when it is in the original position. When the turntable rotates, the outer periphery of the protrusion abuts against the second limit block, further limiting the position of the turntable when it rotates.

[0014] Furthermore, a feed pipe is provided at the wire inlet, the feed pipe is provided with a feed pipe pressure plate and a feed pipe limit block, a discharge pipe is provided at the wire outlet, the discharge pipe is provided with a discharge pipe pressure plate and a discharge pipe limit block, the discharge pipe limit block and the feed pipe limit block are both provided with material holes, and the discharge pipe pressure plate and the feed pipe pressure plate are both provided with pressure grooves. After the wire material enters the feeding channel from the feed pipe, it extends out from the discharge pipe above, and the feed pipe and the discharge pipe protect the wire material and prevent the wire material from being entangled with the wire. The feed pipe and the discharge pipe are detachable, the feed pipe passes through the material hole into the feed pipe limit block, and the feed pipe pressure plate presses the feed pipe through the pressure groove. The discharge pipe limit block and the discharge pipe pressure plate have the same effect on the discharge pipe.

[0015] A wire feeding method for a wire transmission mechanism of a 3D printer comprises the following steps:

[0016] (1) A filament box is provided at the bottom of the 3D printer, a filament pushing device is provided in front of the filament box, a printer nozzle is provided at the top of the 3D printer, and a filament pulling device is provided in the printer nozzle to pull out the filament in the filament box. The filament passes through the filament pushing device, enters the outer ring of the feeding channel from the feed pipe, and then extends out from the discharge pipe, and finally extends into the filament pulling device;

[0017] (2) The 3D printer is started to print. The wire pulling device continuously pulls the wire. The wire moves upward in the wire buffer device. The wire moves from the outer circle of the feeding channel to the inner circle. The wire drives the turntable to move upward.

[0018] (3) After the turntable moves upward, the turntable opening originally located between the upper sensing head and the lower sensing head of the photoelectric sensor rotates downward, and the photoelectric sensor senses that the light between the upper sensing head and the lower sensing head is cut off by the turntable. The photoelectric sensor transmits a signal to the main board, and the main board provides current to the wire pushing device, and the wire pushing device starts;

[0019] (4) The wire pushing device starts to push a section of wire upward, and the wire moves from the inner circle to the outer circle of the feeding channel. The turntable falls back under the gravity of the eccentric wheel until the raised portion of the turntable abuts against the first limit block;

[0020] (5) After the turntable falls back, the turntable opening is located between the upper sensing head and the lower sensing head, and the photoelectric sensor senses the light between the upper sensing head and the lower sensing head. The photoelectric sensor transmits a signal to the main board, and the main board stops providing current to the wire pushing device, and the wire pushing device stops pushing the wire;

[0021] (6) Repeat steps (1) to (5) until printing is completed.

[0022] The turntable in the wire buffer rotates when the wire is fed, and the photoelectric sensor detects the change in the position of the turntable, thereby controlling the opening of the wire pusher, so that the wire pusher works intermittently, while the wire pulling device works continuously. The wire pusher and the wire pulling device do not need to rotate synchronously, thereby ensuring smooth wire discharge from the printer nozzle. The photoelectric sensor has high sensitivity and long service life, reducing the repair cost of the wire buffer.

[0023] Furthermore, there are at least two wire boxes, a two-in-one feeding device is provided between the wire pushing device and the wire buffer device, and a wire monitoring component is provided in the two-in-one feeding device; after the wires in the two wire boxes enter the two-in-one feeding device from the wire pushing device, the wire in the first wire box enters the feeding channel from the feeding pipe, and the wire in the second wire box is placed in the two-in-one feeding device, and when the wire monitoring component detects that there is no wire in the two-in-one feeding device, the wire monitoring component transmits a signal to the main board, and the main board provides current to the wire pushing device in front of the second wire box, and the wire pushing device continues to operate to feed the wire in the second wire box from the two-in-one feeding device into the wire buffer device, and finally enters the printer nozzle to continue printing, and at the same time the main board provides current to the wire pushing device in front of the first wire box to make it rotate in the opposite direction to recover the residual wire.

[0024] The 3D printer is also equipped with a two-in-one feeding device. When the filament in one filament box runs out, the filament in the other filament box can be immediately fed into the printer nozzle, reducing the number of manual filament changes and preventing the printing process from being stopped due to insufficient filament.

[0025] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0026] The present invention provides a wire buffer device between the wire pushing device and the wire pulling device. The eccentric structure in the wire buffer device rotates due to the movement of the wire and triggers the sensor, so that the wire pushing device gap provides thrust, and the wire pulling device continuously provides pulling force. The wire pushing device and the wire pulling device can continuously produce wire without synchronous operation, and the wire production is smooth, thereby improving the printing quality and enhancing the stability of the wire production of the printing nozzle. The specific beneficial effects are:

[0027] 1. The wire pushing device and the wire pulling device can be driven independently, and there is no need to consider the synchronization of the wire pushing device and the wire pulling device.

[0028] 2. The sensor is preferably a photoelectric sensor, which has high sensitivity and a long service life, as its service life is related to the service life of its parts. Mechanical sensors, on the other hand, are prone to damage due to their spring structure and have a short service life.

[0029] 3. The eccentric structure enables the sensor to accurately sense the situation of the wire in the feeding channel, thereby enabling the main board to start or shut down the wire pushing device.

[0030] 4. The feed pipe and the discharge pipe are detachable, which protect the wire and prevent the wire from being entangled with the wire.

[0031] 5. The setting of the transparent cover allows the staff to observe the working condition of the wire buffer device, and if there is any problem with the wire buffer device, it can be repaired in time.

[0032] 6. The first limit block abuts against the raised portion, so that the inner ring opening can be sealed when the turntable is in the original position. When the turntable rotates, the outer periphery of the raised portion abuts against the second limit block, further limiting the position of the turntable when rotating.

[0033] 7. The 3D printer is also equipped with a two-in-one feeding device. When the filament in one filament box is used up, the filament in the other filament box can be immediately fed into the printer nozzle, reducing the number of manual filament changes and preventing the printing process from being stopped due to insufficient filament. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0035] Figure 1 It is a structural schematic diagram of the wire material buffer device when the wire material is fed into the wire material buffer device by the wire material pushing device in the present invention;

[0036] Figure 2 It is a structural schematic diagram of the wire material buffer device when the wire material is pulled out of the wire material buffer device by the wire material pulling device in the present invention;

[0037] Figure 3 It is a structural schematic diagram of the eccentric structure in the present invention;

[0038] Figure 4 It is a structural schematic diagram of the bottom plate of the present invention;

[0039] Figure 5 It is a structural schematic diagram of a filament transmission mechanism of a 3D printer in the present invention;

[0040] Figure 6 The figure is a schematic structural diagram of a filament transmission mechanism of a 3D printer provided with a two-in-one feeding device in the present invention.

[0041] In the figure, 2-wire buffer device; 3-wire pushing device; 4-printer nozzle; 5-bottom plate; 6-feeding channel; 601-outer ring; 602-inner ring; 603-inner ring opening; 7-photoelectric sensor; 701-upper sensing head; 8-turntable; 801-turntable opening; 802-protrusion; 9-eccentric wheel; 10-rotating shaft; 11-wire; 12-first limit block; 13-second limit block; 14-feed pipe; 15-discharge pipe; 16-feed pipe pressure plate; 17-feed pipe limit block; 18-discharge pipe pressure plate; 19-discharge pipe limit block; 20-material hole; 21-pressing groove; 22-transparent cover; 23-wire box; 24-wire pipe; 25-two-in-one feeding device. DETAILED DESCRIPTION

[0042] like Figures 1 to 6 A 3D printer wire transmission mechanism shown in the figure includes a wire pushing device 3, a wire pulling device (not shown in the figure), a main board (not shown in the figure) and a wire buffer device 2. The wire pushing device 3 is installed outside the wire box 23, the wire pulling device is installed in the printer nozzle 4, the wire box 3 is at the bottom of the printer body 5, and the printer nozzle 4 is at the top of the printer body 5. The wire buffer device 2 includes a bottom plate 5, and the bottom plate 5 is provided with a wire inlet, a feeding channel 6, a wire outlet, an eccentric structure and a photoelectric sensor 7. The feeding channel 6 is crescent-shaped, and the feeding channel 6 is provided with an outer ring 601 and an inner ring 602, and the inner ring 602 is provided with an inner ring opening 603. The eccentric structure includes a turntable 8, an eccentric wheel 9 and a rotating shaft 10, and the rotating shaft 10 passes through the turntable 8 and the eccentric wheel 9, one end of the turntable 8 contacts the photoelectric sensor 7, and the other end of the turntable 8 seals the inner ring opening 603. The eccentric structure enables the photoelectric sensor 7 to accurately sense the situation of the wire 11 in the feeding channel 6, so that the main board starts or shuts down the wire pushing device 3. When the wire pulling device pulls the wire 11, the direction in which the turntable 8 rotates is consistent with the direction in which the wire 11 moves, so as to avoid excessive resistance between the wire 11 and the turntable 8, which causes the wire pulling device to be unable to pull the wire 11.

[0043] The photoelectric sensor 7 is provided with an upper sensing head 701 and a lower sensing head (not shown in the figure), and the turntable 8 is provided with a turntable opening 801, and the turntable opening 801 is located between the upper sensing head 701 and the lower sensing head. A protrusion 802 is provided at one end of the turntable 8 that seals the inner ring opening 603, and the bottom plate 5 is provided with a first limit block 12, and the top of the first limit block 12 matches the bottom of the protrusion 802. The first limit block 12 abuts against the protrusion 802, so that the turntable 8 can seal the inner ring opening 603 when it is in the original position. The outer periphery of the protrusion 802 is arc-shaped, and the bottom plate 5 is provided with a second limit block 13, and the second limit block 13 abuts against the top of the protrusion 802. When the turntable 8 rotates, the outer periphery of the protrusion 802 abuts against the second limit block 13, further limiting the position of the turntable 8 when it rotates.

[0044] A feed pipe 14 is provided at the wire inlet, and a discharge pipe 15 is provided at the wire outlet. The feed pipe 14 and the discharge pipe 15 are connected with the feeding channel 6. After the wire 11 enters the feeding channel 6 from the feed pipe 14, it extends from the discharge pipe 15 above. The feed pipe 14 and the discharge pipe 15 protect the wire 11 and prevent the wire 11 from being entangled with the wire. A feed pipe pressing plate 16 and a feed pipe limiting block 17 are provided at the tail of the bottom plate 5, and a discharge pipe pressing plate 18 and a discharge pipe limiting block 19 are provided at the top of the bottom plate 5. Both the discharge pipe limiting block 19 and the feed pipe limiting block 17 are provided with a material hole 20, and both the discharge pipe pressing plate 18 and the feed pipe pressing plate 16 are provided with a pressing groove 21. The feed pipe 14 and the discharge pipe 15 are detachable. The feed pipe 14 passes through the material hole 20 and enters the feed pipe limiting block 17, and the feed pipe pressing plate 16 presses the feed pipe 14 through the pressing groove 21. The discharge pipe limit block 19 and the discharge pipe pressure plate 18 have the same effect on the discharge pipe 15. The bottom plate 5 is screwed with a transparent cover plate 22. The transparent cover plate 22 allows the staff to observe the working condition of the wire material 11 buffer device 2, and if there is a problem with the wire material 11 buffer device 2, it can be repaired in time.

[0045] The printer body 5 is further provided with a two-in-one feeding device 25 between the wire box 23 and the wire buffer device 2 , and a wire monitoring component is provided inside the two-in-one feeding device 25 .

[0046] In this embodiment, the printer body 5 is provided with two printer nozzles 4, two wire buffer devices 2, two two-in-one feeding devices 25 and four wire boxes 23. Each printer nozzle 4 corresponds to a wire buffer device 2, a two-in-one feeding device 25 and two wire boxes 23. The wires in the two printer nozzles 4 can be wires 11 of different materials and colors, and the two wires 11 corresponding to the same printer nozzle 4 are the same wire 11. A wire tube 24 is provided between the printer nozzle 4, the wire buffer device 2, the two-in-one feeding device 25 and the wire box 23.

[0047] A wire feeding method using a wire material transmission mechanism of a 3D printer comprises the following steps:

[0048] (1) A wire material box 23 is provided at the bottom of the 3D printer, a wire material pushing device 3 is provided in front of the wire material box 23, a printer nozzle 4 is provided at the top of the 3D printer, and a wire material pulling device is provided in the printer nozzle 4. The two wire materials 11 in the two wire material boxes are pulled out, and the two wire materials 11 pass through the wire material pushing device 3 and enter the two-in-one feeding device 25 from the wire material tube 24. The wire material 11 in the first wire material box (not shown in the figure) is extended into the feed tube 14 and enters the outer ring 601 of the feeding channel 6, and then extends out from the discharge tube 15. The wire material 11 is finally extended into the wire pulling device along the wire tube 24, and the wire material 11 in the second wire material box (not shown in the figure) is placed in the two-in-one feeding device 25;

[0049] (2) The 3D printer is started to start printing. The wire pulling device continuously pulls the wire 11. The wire 11 moves upward in the wire buffer device 2. The wire 11 moves from the outer ring 601 of the feeding channel 6 to the inner ring 602. The wire 11 drives the turntable 8 to move upward.

[0050] (3) After the turntable 8 moves upward, the turntable 8 opening originally located between the upper sensing head 701 and the lower sensing head of the photoelectric sensor 7 rotates downward, and the photoelectric sensor 7 senses that the light between the upper sensing head 701 and the lower sensing head is cut off by the turntable 8. The photoelectric sensor 7 transmits a signal to the main board, and the main board provides current to the wire pushing device 3, and the wire pushing device 3 starts;

[0051] (4) The wire pushing device 3 starts to push a section of wire 11 upward, and the wire 11 moves from the inner ring 602 to the outer ring 601 of the feeding channel 6. The turntable 8 falls back under the gravity of the eccentric wheel 9 until the raised portion 802 of the turntable 8 abuts against the first limit block 12.

[0052] (5) After the turntable 8 falls back, the opening of the turntable 8 is located between the upper sensing head 701 and the lower sensing head, and the photoelectric sensor 7 senses the light between the upper sensing head 701 and the lower sensing head. The photoelectric sensor 7 transmits a signal to the main board, and the main board stops providing current to the wire pushing device 3, and the wire pushing device 3 stops pushing the wire 11;

[0053] (6) Repeat steps (1) to (5) until printing is completed;

[0054] (7) If the wire 11 in the first wire box is almost used up, the wire monitoring component detects that there is no wire 11 in the two-in-one feeding device 25, and the wire monitoring component transmits a signal to the main board. The main board provides current to the wire pushing device 3 in front of the second wire box. The wire pushing device 3 continues to operate, and the wire 11 in the second wire box is sent from the two-in-one feeding device 25 along the wire tube 24 into the wire buffer device 2, and finally enters the printer nozzle 4 to continue printing. At the same time, the main board provides current to the wire pushing device 3 in front of the first wire box, so that it rotates in the opposite direction to recover the remaining wire 11.

[0055] 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 3D printer filament transmission mechanism, comprising a filament box and a nozzle, wherein the filament box contains filament for supplying the nozzle, and the filament is transmitted to the nozzle through a power system, characterized in that: The power system includes a wire pushing device near one end of the wire box, a wire pulling device near one end of the nozzle, and a wire buffer device arranged between the wire pushing device and the wire pulling device, the wire buffer device includes a wire inlet, a buffer channel and a wire outlet, a sensor is arranged in the buffer channel, the sensor is used to sense the state of the wire, the sensor includes a trigger part and a sensing part, the trigger part is used to sense the tight or loose state of the wire, the sensing part is used to receive the state of the trigger part, the trigger part and the sensing part are installed on the bottom plate, the trigger part is an eccentric structure, the eccentric structure rotates on the bottom plate, one end of the eccentric structure is in contact with the sensing part, and the other end of the eccentric structure is in contact with the buffer channel, the sensing part is a photoelectric sensor, the photoelectric sensor The sensor is provided with an upper sensing head and a lower sensing head, the trigger part has a first state and a second state, when the wire material changes from being relaxed to being taut, the trigger part changes from the first state to the second state, and when the wire material changes from being taut to being relaxed, the trigger part changes from the second state to the first state. In the first state, the wire pushing device feeds the wire, and the wire pulling device stops working; in the second state, the wire pulling device draws the wire, and the wire pushing device stops working; the buffer channel is crescent-shaped, and the buffer channel is provided with an outer ring and an inner ring, and the inner ring is provided with an inner ring opening; the eccentric structure includes a turntable, an eccentric wheel and a rotating shaft, and the rotating shaft passes through the turntable and the eccentric wheel, one end of the turntable contacts the sensor, and the other end of the turntable seals the inner ring opening; the turntable is provided with a turntable opening, and the turntable opening is located between the upper sensing head and the lower sensing head.

2. A 3D printer filament transmission mechanism according to claim 1, characterized in that: A raised portion is provided at one end of the turntable that seals the inner ring opening, and a first limit block is provided on the bottom plate, the top of the first limit block matches the bottom of the raised portion, the outer periphery of the raised portion is arc-shaped, and a second limit block is provided on the bottom plate, which abuts against the top of the raised portion.

3. A 3D printer filament transmission mechanism according to claim 2, characterized in that: A feed pipe is provided at the wire inlet, and the feed pipe is provided with a feed pipe pressure plate and a feed pipe limit block. The wire outlet is provided with a discharge pipe, and the discharge pipe is provided with a discharge pipe pressure plate and a discharge pipe limit block. Both the discharge pipe limit block and the feed pipe limit block are provided with material holes, and both the discharge pipe pressure plate and the feed pipe pressure plate are provided with pressure grooves.

4. A wire feeding method using the wire transmission mechanism of a 3D printer as claimed in claim 3, characterized in that: The steps include: (1) A filament box is provided at the bottom of the 3D printer, a filament pushing device is provided in front of the filament box, a printer nozzle is provided at the top of the 3D printer, and a filament pulling device is provided in the printer nozzle to pull out the filament in the filament box. The filament passes through the filament pushing device, enters the outer ring of the buffer channel from the feed pipe, and then extends out from the discharge pipe, and finally extends into the filament pulling device; (2) The 3D printer is started to print. The filament pulling device continuously pulls the filament. The filament moves upward in the filament buffer device. The filament moves from the outer circle to the inner circle of the buffer channel. The filament drives the turntable to move upward. (3) After the turntable moves upward, the turntable opening originally located between the upper sensing head and the lower sensing head of the photoelectric sensor rotates downward, and the photoelectric sensor senses that the light between the upper sensing head and the lower sensing head is cut off by the turntable. The photoelectric sensor transmits a signal to the main board, and the main board provides current to the wire pushing device, and the wire pushing device starts; (4) The wire pushing device starts to push a section of wire upward, and the wire moves from the inner circle of the buffer channel to the outer circle. The turntable falls back under the gravity of the eccentric wheel until the raised portion of the turntable abuts against the first limit block; (5) After the turntable falls back, the turntable opening is located between the upper sensor head and the lower sensor head. The photoelectric sensor senses the light between the upper sensor head and the lower sensor head. The photoelectric sensor transmits a signal to the main board. The main board stops providing current to the wire pushing device, and the wire pushing device stops pushing the wire. (6) Repeat steps (1) to (5) until printing is complete.

5. A wire feeding method using a wire transmission mechanism of a 3D printer according to claim 4, characterized in that: There are at least two wire material boxes, a two-in-one feeding device is provided between the wire material pushing device and the wire material buffer device, and a wire material monitoring component is provided in the two-in-one feeding device; after the wire materials in the two wire material boxes enter the two-in-one feeding device from the wire material pushing device, the wire material in the first wire material box enters the buffer channel from the feeding pipe, and the wire material in the second wire material box is placed in the two-in-one feeding device; when the wire material monitoring component detects that there is no wire material in the two-in-one feeding device, the wire material monitoring component transmits a signal to the main board, and the main board provides current to the wire material pushing device in front of the second wire material box, and the wire material pushing device continues to operate to feed the wire material in the second wire material box from the two-in-one feeding device into the wire material buffer device, and finally enters the printer nozzle to continue printing, and at the same time, the main board provides current to the wire material pushing device in front of the first wire material box to make it rotate in the opposite direction to recover the residual wire material.

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