Automatic wire changing device

Abstract

The present invention provides an automatic wire changing device, which relates to the field of 3D printer accessories, including a printer body, an extruder body, a wire reel support shaft, a plastic wire reel body, a wire changing fixing frame, a wire changing auxiliary box, a wire changing duct, a wire changing locking mechanism and a wire changing driving mechanism; the plastic wire reel body is respectively arranged on the outer periphery of the wire reel support shaft; the wire changing fixing frame is fixedly connected to the upper rear end of the extruder body; the wire changing auxiliary box is fixedly connected to the front upper end of the wire changing fixing frame; the wire changing duct is respectively fixedly connected to the left and right sides above the wire changing auxiliary box; the wire changing locking mechanism is provided in two groups, and the two groups of wire changing locking mechanisms are respectively arranged on the outer sides of the wire reel support shaft; the wire changing driving mechanism is arranged inside the wire changing auxiliary box, which avoids stopping the printer for wire changing operation, improves the printing efficiency of the model, and solves the existing problem of needing to stop the printer for plastic wire replacement, affecting the printing efficiency of the model and affecting the use effect of the printer.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printer accessories, and in particular to an automatic filament changing device. Background Art

[0002] 3D printing, based on digital model files, uses adhesive materials such as powdered metal or plastic to construct objects by printing layer by layer. The current 3D printing based on fused deposition modeling (FDM) technology mainly relies on the heating and melting, layer-by-layer deposition and cooling and solidification of thermoplastic materials. When using existing 3D printers, the plastic filament reel is generally placed on the frame, and then one end of the plastic filament is connected to the inside of the extruder, and the extruder feeds the plastic filament at the same time.

[0003] The existing publication number is: CN113524664A The present invention provides an automatic filament changing device for a 3D printer, comprising a printing box, a loading platform and a printing device, wherein the printing device comprises a lower box and an upper box fixedly connected to each other, the lower box is provided with a lower cavity, a gear is rotatably provided in the lower cavity, a compression box is symmetrically fixedly provided in the lower cavity, a feeding hole and a telescopic hole are respectively provided on the inner wall of the compression box, a plug hole is provided on the bottom wall of the lower box corresponding to the telescopic hole, a heating block is fixedly provided in the feeding hole, the heating block does not completely block the feeding hole, and a feeding pipe is fixedly connected to the outside of the feeding hole; during use, the present invention can automatically change the filament by simply controlling the rotation of the gear, and ensures that the molten filament will not drip onto the loading platform to cause pollution, and can timely know that the filament is completely consumed and then replace it without running with empty material to damage the machine, thereby improving the service life and greatly saving people's time for changing the filament. It is very worthy of promotion and use.

[0004] However, when the existing printer uses up a set of plastic filament reels, it is necessary to shut down the printer, replace the new plastic filament reel, and reinsert the new plastic filament into the extruder, which requires the printer to be shut down for plastic filament replacement, affecting the printing efficiency of the model and the use effect of the printer. Summary of the Invention

[0005] In view of this, the present invention provides an automatic wire changing device, which facilitates the replacement of the plastic wire reel body, realizes reminders to users, ensures stable operation of the printer, realizes the function of automatic wire changing, avoids stopping for wire changing operations, reduces the user's operating steps, improves the printing efficiency of the model, avoids faults in the model, improves the printing quality, and improves the use effect of the entire printer.

[0006] The present invention provides the purpose and efficacy of an automatic wire changing device, comprising a printer body, an extruder body, a wire reel support shaft, a plastic wire reel body, a wire changing fixing frame, a wire changing auxiliary box, a wire changing guide tube, a wire changing locking mechanism and a wire changing driving mechanism;

[0007] The extruder body is arranged on the printer body;

[0008] There are two sets of filament spool support shafts, which are fixedly connected to the left and right sides of the rear of the printer body respectively;

[0009] There are two groups of plastic wire reel bodies, and the two groups of plastic wire reel bodies are respectively arranged on the outer periphery of the wire reel bracket shaft;

[0010] The wire changing fixed frame is fixedly connected to the upper rear end of the extruder body;

[0011] The wire-changing auxiliary box is fixedly connected to the front upper end of the wire-changing fixed frame;

[0012] There are two groups of wire-changing ducts, which are fixedly connected to the left and right sides of the upper part of the wire-changing auxiliary box respectively.

[0013] There are two sets of wire-changing locking mechanisms, which are respectively arranged on the outside of the wire reel bracket shaft;

[0014] The wire-changing drive mechanism is arranged inside the wire-changing auxiliary box.

[0015] Furthermore, the wire changing and locking mechanism includes: a wire break detector and a wire break buzzer;

[0016] There are two sets of broken wire detectors, which are respectively fixed on the left and right sides of the upper part of the wire changing fixed frame. The plastic wire passes through the broken wire detectors and is inserted into the interior of the wire changing auxiliary box.

[0017] There are two groups of broken wire buzzers, which are respectively fixedly connected to the front end of the broken wire detector. Both groups of broken wire buzzers are electrically connected to the control circuit of the broken wire detector.

[0018] Furthermore, the wire changing and locking mechanism further comprises: replacing the connecting rod and replacing the support plate;

[0019] The replacement connecting rods are provided in multiple groups, and the multiple groups of replacement connecting rods are respectively hinged on the outer periphery of the wire reel bracket shaft;

[0020] There are four groups of replacement support plates in total, all of which are tile-shaped plate structures. The four groups of replacement support plates are respectively hinged on the outside of the replacement connecting rods. Multiple groups of replacement connecting rods and replacement support plates together form a parallelogram structure.

[0021] Furthermore, the wire changing and locking mechanism further comprises: replacing the fixing plate, replacing the driving plate, replacing the clamping spring, replacing the electromagnet and replacing the magnet;

[0022] The replacement fixing plate is fixedly connected to the front end of the outer periphery of the plastic wire reel body;

[0023] The replacement drive plate is slidably connected to the rear of the replacement fixing plate;

[0024] The replacement clamping springs are provided in four groups, and the four groups of replacement clamping springs are respectively fixedly connected to the front end of the replacement drive plate, and the front ends of the four groups of replacement clamping springs are all fixedly connected to the replacement fixing plate;

[0025] The replacement electromagnet is fixedly connected above the replacement fixing plate, and the replacement electromagnet is connected in series with the circuit of the broken wire buzzer;

[0026] The replacement magnet is fixedly connected above the replacement drive plate, and the replacement magnet is magnetically connected to the replacement electromagnet.

[0027] Furthermore, the wire changing and locking mechanism further comprises: replacing the driving rack and replacing the driving gear;

[0028] There are four groups of replacement drive racks, and the four groups of replacement drive racks are respectively fixedly connected to the rear end of the replacement drive plate;

[0029] There are four groups of replacement drive gears in total. The four groups of replacement drive gears are coaxially fixedly connected to the outer sides of the rotating shafts of the four groups of replacement connecting rods at the rear, and the four groups of replacement drive gears are respectively engaged with the replacement drive racks.

[0030] Furthermore, the wire-changing drive mechanism includes: a wire-changing slot, a wire-changing guide groove, and a wire-changing drive gear;

[0031] The wire changing slot is provided inside the wire changing auxiliary box and has a Y-shaped slot structure;

[0032] There are two groups of wire-changing guide grooves, which are respectively opened on the inner side of the wire-changing auxiliary box. Both groups of wire-changing guide grooves are arc-shaped groove structures.

[0033] There are four groups of wire changing drive gears in total. The two upper groups of wire changing drive gears are respectively arranged on the inner sides of the wire changing guide grooves, and the two lower groups of wire changing drive gears are both rotatably connected to the inside of the wire changing auxiliary box. The two upper groups of wire changing drive gears are respectively engaged with the two lower groups of wire changing drive gears.

[0034] Furthermore, the wire-changing drive mechanism further comprises: a wire-changing extrusion wheel and a wire-changing transmission wheel;

[0035] There are four groups of wire-changing extrusion wheels in total, and the four groups of wire-changing extrusion wheels are coaxially fixedly connected to the front end of the wire-changing drive gear. The outer periphery of the four groups of wire-changing extrusion wheels is provided with an anti-slip pattern structure;

[0036] There are two groups of wire-changing transmission wheels, which are coaxially fixedly connected to the front ends of the two groups of wire-changing extrusion wheels below, and are connected by belt transmission.

[0037] Furthermore, the wire-changing drive mechanism further comprises: a wire-changing limiter and a wire-changing return spring;

[0038] There are two groups of wire-changing limiters, which are respectively fixedly connected to the inner side of the wire-changing auxiliary box, and the inner sides of the two groups of wire-changing limiters are both provided with ratchet groove structures;

[0039] There are two groups of wire-changing reset springs, both of which are vortex spring structures. The vortex core ends of the two groups of wire-changing reset springs are fixedly connected to the wire-changing transmission wheel, and the vortex tail ends of the two groups of wire-changing reset springs are arranged on the inner side of the wire-changing limiter.

[0040] Beneficial effects

[0041] The present invention sets a wire-changing locking mechanism. After the circuit of the replacement electromagnet is connected to generate magnetism, the replacement electromagnet attracts the replacement magnet to move forward. The replacement magnet moves forward and drives the replacement drive plate to move forward. The replacement drive plate moves forward and drives the replacement drive rack to move forward. The replacement drive rack moves forward and drives the replacement drive gear to rotate. The rotation of the replacement drive gear drives the replacement connecting rod to rotate. The rotation of the replacement connecting rod drives the replacement support plate to relax. At this time, the replacement support plate no longer clamps the plastic wire reel body, which makes it convenient to replace the plastic wire reel body, realizes reminder to the user, ensures stable operation of the printer, avoids faults in the printed model, and improves printing quality.

[0042] The present invention is provided with a wire changing drive mechanism. When a group of plastic wire moves, the plastic wire drives a left group of wire changing extrusion wheels to rotate. The rotation of the left group of wire changing extrusion wheels drives the wire changing transmission wheel to rotate. The rotation of the wire changing transmission wheel drives the vortex core end of the wire changing reset spring to contract. The contraction of the vortex core end of the wire changing reset spring realizes charging. At the same time, the rotation of the wire changing transmission wheel also drives a right group of wire changing transmission wheels to rotate. When the plastic wire on the left is used up, the left wire changing extrusion wheel is no longer squeezed, and the left wire changing transmission wheel is driven to reverse by the wire changing reset spring. At this time, the rotation of the wire changing transmission wheel drives the right group of wire changing extrusion wheels to rotate. The rotation of the right wire changing extrusion wheel realizes the feeding of the right plastic wire under the action of the right wire changing drive gear, realizes the function of automatic wire changing, avoids stopping for wire changing operation, reduces the user's operating steps, improves the printing efficiency of the model, avoids the occurrence of faults in the model, improves the printing quality, and improves the use effect of the entire printer. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0044] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0045] In the attached figure:

[0046] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0047] Figure 2 It is a schematic diagram of the structure of replacing the support plate in an embodiment of the present invention.

[0048] Figure 3 It is a structural schematic diagram of the wire changing and locking mechanism of an embodiment of the present invention.

[0049] Figure 4 It is a schematic diagram of the structure of the replacement electromagnet according to an embodiment of the present invention.

[0050] Figure 5 2 is a schematic structural diagram of a wire-broken buzzer according to an embodiment of the present invention.

[0051] Figure 6 It is a schematic structural diagram of a wire-changing extrusion wheel according to an embodiment of the present invention.

[0052] Figure 7 2 is a schematic structural diagram of a wire changing drive mechanism according to an embodiment of the present invention.

[0053] Figure 8 2 is a schematic diagram of the wire-changing drive ratchet structure of an embodiment of the present invention.

[0054] Reference Signs List

[0055] 1. Printer body; 101. Broken wire detector; 102. Broken wire buzzer; 103. Replace the connecting rod; 104. Replace the support plate; 105. Replace the fixing plate; 106. Replace the drive plate; 107. Replace the clamping spring; 108. Replace the electromagnet; 109. Replace the magnet; 110. Replace the drive rack; 111. Replace the drive gear; 2. Extruder body; 3. Wire reel bracket shaft; 4. Plastic filament reel body; 5. Wire change fixing frame; 6. Wire change auxiliary box; 601. Wire change slot; 602. Wire change guide groove; 603. Wire change drive gear; 604. Wire change extrusion wheel; 605. Wire change transmission wheel; 606. Wire change limiter; 607. Wire change return spring; 7. Wire change guide tube. DETAILED DESCRIPTION

[0056] Example 1: Please refer to Figures 1 to 6 As shown:

[0057] The present invention provides an automatic wire changing device, comprising a printer body 1, an extruder body 2, a wire reel support shaft 3, a plastic wire reel body 4, a wire changing fixing frame 5, a wire changing auxiliary box 6, a wire changing conduit 7 and a wire changing locking mechanism;

[0058] The extruder body 2 is arranged on the printer body 1;

[0059] There are two sets of filament spool support shafts 3, which are fixedly connected to the left and right sides of the rear of the printer body 1 respectively.

[0060] There are two sets of plastic wire reel bodies 4, and the two sets of plastic wire reel bodies 4 are respectively arranged on the outer periphery of the wire reel bracket shaft 3;

[0061] The wire changing fixed frame 5 is fixedly connected to the upper rear end of the extruder body 2;

[0062] The wire-changing auxiliary box 6 is fixedly connected to the front upper end of the wire-changing fixed frame 5;

[0063] There are two groups of wire-changing ducts 7, which are fixedly connected to the left and right sides of the upper part of the wire-changing auxiliary box 6 respectively;

[0064] There are two sets of wire-changing locking mechanisms, which are respectively arranged on the outside of the wire reel support shaft 3 .

[0065] The wire replacement and locking mechanism includes: a broken wire detector 101, a broken wire buzzer 102, a replacement connecting rod 103, a replacement supporting plate 104, a replacement fixing plate 105, a replacement driving plate 106, a replacement clamping spring 107, a replacement electromagnet 108, a replacement magnet 109, a replacement driving rack 110, and a replacement driving gear 111;

[0066] There are two groups of broken wire detectors 101, which are fixedly connected to the left and right sides of the upper part of the wire-changing fixed frame 5 respectively. The plastic wire passes through the broken wire detectors 101 and is inserted into the interior of the wire-changing auxiliary box 6. The broken wire detectors 101 monitor the consumables. After the consumables are used up, the infrared tubes in the broken wire detectors 101 will emit infrared rays of a certain frequency. When the infrared rays pass through the plastic wire or the tube wall, they will be reflected and received by the infrared tubes. After being processed by the comparator circuit, the broken wire detectors 101 will output corresponding high and low level signals.

[0067] Two sets of wire-broken buzzers 102 are provided. The two sets of wire-broken buzzers 102 are respectively fixedly connected to the front end of the wire-broken detector 101. The two sets of wire-broken buzzers 102 are electrically connected to the control circuit of the wire-broken detector 101. When the wire-broken detector 101 detects that there is no object in front, that is, the plastic wire has been used up, the infrared tube device will transmit a jump level to the microprocessor, thereby turning on the wire-broken buzzer 102. The wire-broken buzzer 102 is turned on and emits a sound, thereby reminding the user to replace the plastic wire reel body 4 in time.

[0068] There are multiple groups of replacement connecting rods 103, and the multiple groups of replacement connecting rods 103 are respectively hinged to the outer periphery of the wire reel bracket shaft 3;

[0069] There are four groups of replacement support plates 104, all of which are tile-shaped plate structures. The four groups of replacement support plates 104 are respectively hinged on the outside of the replacement connecting rod 103. Multiple groups of replacement connecting rods 103 and replacement support plates 104 together form a parallelogram structure. In use, by rotating the replacement connecting rod 103, the replacement connecting rod 103 rotates and drives the replacement support plates 104 to move outward. The replacement support plates 104 move outward to achieve the inner clamping and fixing of the plastic wire reel body 4;

[0070] The replacement fixing plate 105 is fixedly connected to the front end of the outer periphery of the plastic wire disc body 4, and the replacement fixing plate 105 is a circular ring structure;

[0071] The replacement drive plate 106 is slidably connected to the rear of the replacement fixed plate 105. The replacement drive plate 106 is a circular ring structure. The front end of the replacement drive plate 106 is fixedly connected with four sets of guide rod structures. The replacement drive plate 106 realizes the driving effect when clamping the plastic wire disc body 4;

[0072] There are four groups of replacement clamping springs 107, which are respectively fixedly connected to the front end of the replacement drive plate 106. The front ends of the four groups of replacement clamping springs 107 are all fixedly connected to the replacement fixing plate 105. The replacement clamping springs 107 squeeze the replacement drive plate 106 backward, and the replacement drive plate 106 is squeezed and moved backward to realize driving;

[0073] The replacement electromagnet 108 is fixedly connected above the replacement fixing plate 105. The replacement electromagnet 108 is connected in series with the circuit of the broken wire buzzer 102. When the circuit of the broken wire buzzer 102 is connected, the circuit of the replacement electromagnet 108 is connected to generate magnetism.

[0074] The replacement magnet 109 is fixedly connected to the top of the replacement drive plate 106. The replacement magnet 109 is magnetically connected to the replacement electromagnet 108. When the circuit of the replacement electromagnet 108 is connected and magnetism is generated, the replacement electromagnet 108 attracts the replacement magnet 109 to move forward, and the replacement magnet 109 moves forward, driving the replacement drive plate 106 to move forward.

[0075] There are four sets of replacement drive racks 110, and the four sets of replacement drive racks 110 are fixedly connected to the rear end of the replacement drive plate 106 respectively;

[0076] There are four groups of replacement drive gears 111, which are coaxially fixedly connected to the outer sides of the rotating shafts of the four rear replacement connecting rods 103, and are respectively engaged with the replacement drive racks 110.

[0077] During use, when the consumables are used up, the infrared pair tube in the broken wire detector 101 will emit infrared rays of a certain frequency. When the infrared rays pass through the plastic wire or the tube wall, they will be reflected and received by the infrared pair tube. After being processed by the comparator circuit, the broken wire detector 101 will output corresponding high and low level signals, thereby turning on the broken wire buzzer 102. The broken wire buzzer 102 is turned on and makes a sound, which reminds the user to replace the new plastic wire reel body 4 in time. At the same time, after the circuit of the replacement electromagnet 108 is connected to generate magnetism, the replacement electromagnet 108 attracts the replacement magnet 109 to move forward, and the replacement magnet 10 9 moves forward to drive the replacement drive plate 106 to move forward, and the replacement drive plate 106 moves forward to drive the replacement drive rack 110 to move forward, and the replacement drive rack 110 moves forward to drive the replacement drive gear 111 to rotate, and the replacement drive gear 111 rotates to drive the replacement connecting rod 103 to rotate, and the replacement connecting rod 103 rotates to drive the replacement support plate 104 to relax. At this time, the replacement support plate 104 no longer clamps the plastic filament reel body 4, which makes it convenient to replace the plastic filament reel body 4, realizes the reminder to the user, ensures the stable operation of the printer, avoids the fault of the printed model, and improves the printing quality.

[0078] Example 2:

[0079] The present invention provides an automatic wire changing device, based on the first embodiment, as Figures 1 to 8 As shown, it also includes a wire-changing drive mechanism, which is arranged inside the wire-changing auxiliary box 6.

[0080] The wire-changing drive mechanism includes: a wire-changing slot 601, a wire-changing guide groove 602, a wire-changing drive gear 603, a wire-changing extrusion wheel 604, a wire-changing transmission wheel 605, a wire-changing limiter 606, and a wire-changing return spring 607;

[0081] The wire changing slot 601 is provided inside the wire changing auxiliary box 6. The wire changing slot 601 is a Y-shaped slot structure. One group of plastic wires passes through the wire changing slot 601, and the other group of plastic wires passes through the upper end of the wire changing slot 601. The two groups of plastic wires are in frictional contact inside the wire changing slot 601. The wire changing slot 601 realizes the guiding function of the plastic wires.

[0082] There are two sets of wire-changing guide grooves 602, which are respectively opened on the inner side of the wire-changing auxiliary box 6. Both sets of wire-changing guide grooves 602 are arc-shaped groove structures, and the two sets of wire-changing guide grooves 602 realize the guiding function.

[0083] There are four groups of wire-changing drive gears 603 in total. The two upper groups of wire-changing drive gears 603 are respectively arranged on the inner sides of the wire-changing guide groove 602, and the two lower groups of wire-changing drive gears 603 are rotatably connected to the inside of the wire-changing auxiliary box 6. The two upper groups of wire-changing drive gears 603 are respectively meshed with the two lower groups of wire-changing drive gears 603. When the two lower groups of wire-changing drive gears 603 rotate clockwise, the upper left group of wire-changing drive gears 603 and the lower left group of wire-changing drive gears 603 are transmitted, while the upper right group of wire-changing drive gears 603 will move along the wire-changing guide groove 602, and the upper right group of wire-changing drive gears 603 will not be driven to rotate.

[0084] There are four groups of wire-changing extrusion wheels 604, which are coaxially fixed to the front end of the wire-changing drive gear 603. The outer periphery of the four groups of wire-changing extrusion wheels 604 is provided with an anti-slip structure, and the wire-changing extrusion wheels 604 realize the extrusion function of the plastic wire.

[0085] There are two sets of wire-changing transmission wheels 605, which are coaxially fixed to the front ends of the two sets of wire-changing extrusion wheels 604 below. The two sets of wire-changing transmission wheels 605 are connected by belt transmission, and the two sets of wire-changing transmission wheels 605 realize the transmission of kinetic energy to the wire-changing extrusion wheels 604.

[0086] There are two groups of wire-changing limiters 606, which are respectively fixedly connected to the inner side of the wire-changing auxiliary box 6. The inner sides of the two groups of wire-changing limiters 606 are both provided with a ratchet groove structure.

[0087] There are two groups of wire-changing reset springs 607, both of which are vortex spring structures. The vortex core ends of the two groups of wire-changing reset springs 607 are fixedly connected to the wire-changing transmission wheel 605, and the vortex tail ends of the two groups of wire-changing reset springs 607 are arranged on the inner side of the wire-changing limiter 606. When the wire-changing transmission wheel 605 rotates, the rotation of the wire-changing transmission wheel 605 drives the vortex core end of the wire-changing reset spring 607 to contract, and the vortex core end of the wire-changing reset spring 607 contracts to realize charging.

[0088] When the filament is in the machine direction, the filament extrusion wheel 604 on the left is rotated, and the rotation of the filament extrusion wheel 604 on the left drives the filament changing transmission wheel 605 to rotate. The rotation of the filament changing transmission wheel 605 drives the vortex core end of the filament changing return spring 607 to contract, and the vortex core end of the filament changing return spring 607 contracts to charge energy. At the same time, the rotation of the filament changing transmission wheel 605 also drives the right filament changing transmission wheel 605 to rotate. When the plastic filament on the left is used up, the filament extrusion wheel 604 on the left is no longer squeezed, and the filament changing transmission wheel 605 on the left is driven to reverse by the filament changing return spring 607. At this time, the rotation of the filament changing transmission wheel 605 drives the right filament changing extrusion wheel 604 to rotate. The rotation of the right filament changing extrusion wheel 604 realizes the feeding of the plastic filament on the right side under the action of the right filament changing drive gear 603, realizing the function of automatic filament changing, avoiding the need to stop the machine for filament changing operation, reducing the user's operating steps, improving the printing efficiency of the model, avoiding the occurrence of faults in the model, improving the printing quality, and improving the use effect of the entire printer.

[0089] In this article, there are several points to note:

[0090] 1. The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0091] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0092] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. An automatic wire changing device, comprising a printer body (1), an extruder body (2), a wire reel support shaft (3), a plastic wire reel body (4), a wire changing fixing frame (5), a wire changing auxiliary box (6), a wire changing guide tube (7), a wire changing locking mechanism and a wire changing driving mechanism; the extruder body (2) is arranged on the printer body (1); characterized in that: The wire reel support shaft (3) is provided in two groups, and the two groups of wire reel support shafts (3) are fixedly connected to the left and right sides of the rear of the printer body (1); the plastic wire reel body (4) is provided in two groups, and the two groups of plastic wire reel bodies (4) are respectively provided on the outer periphery of the wire reel support shaft (3); the wire changing fixed frame (5) is fixedly connected to the upper rear end of the extruder body (2); the wire changing auxiliary box (6) is fixedly connected to the front upper end of the wire changing fixed frame (5); the wire changing duct (7) is provided in two groups, and the two groups of wire changing ducts (7) are respectively fixedly connected to the left and right sides of the upper part of the wire changing auxiliary box (6); the wire changing locking mechanism is provided in two groups, and the two groups of wire changing locking mechanisms are respectively provided on the outer sides of the wire reel support shaft (3); the wire changing driving mechanism is provided inside the wire changing auxiliary box (6); The wire-changing drive mechanism comprises: a wire-changing slot (601), a wire-changing guide groove (602) and a wire-changing drive gear (603); the wire-changing slot (601) is arranged inside the wire-changing auxiliary box (6), and the wire-changing slot (601) is a Y-shaped slot structure; the wire-changing guide groove (602) is provided in two groups, and the two groups of wire-changing guide grooves (602) are respectively arranged on the inner side of the wire-changing auxiliary box (6), and the two groups of wire-changing guide grooves (602) are both arc-shaped slot structures; the wire-changing drive gear (603) is provided in four groups, the upper two groups of wire-changing drive gears (603) are respectively arranged on the inner side of the wire-changing guide groove (602), and the lower two groups of wire-changing drive gears (603) are both rotatably connected to the inside of the wire-changing auxiliary box (6), and the upper two groups of wire-changing drive gears (603) are respectively engaged with the lower two groups of wire-changing drive gears (603); The wire-changing drive mechanism further comprises: a wire-changing extrusion wheel (604) and a wire-changing transmission wheel (605); the wire-changing extrusion wheels (604) are provided in four groups, the four groups of wire-changing extrusion wheels (604) are respectively coaxially fixedly connected to the front end of the wire-changing drive gear (603), and the outer peripheries of the four groups of wire-changing extrusion wheels (604) are all provided with anti-slip groove structures; the wire-changing transmission wheels (605) are provided in two groups, the two groups of wire-changing transmission wheels (605) are respectively coaxially fixedly connected to the front ends of the two lower groups of wire-changing extrusion wheels (604), and the two groups of wire-changing transmission wheels (605) are connected via a belt drive; The wire-changing drive mechanism further comprises: a wire-changing limiter (606) and a wire-changing return spring (607); two groups of the wire-changing limiters (606) are provided, and the two groups of wire-changing limiters (606) are respectively fixedly connected to the inner side of the wire-changing auxiliary box (6), and the inner sides of the two groups of wire-changing limiters (606) are both provided with a ratchet groove structure; two groups of the wire-changing return springs (607) are provided, and the two groups of wire-changing return springs (607) are both vortex spring structures, the vortex core ends of the two groups of wire-changing return springs (607) are both fixedly connected to the wire-changing transmission wheel (605), and the vortex tail ends of the two groups of wire-changing return springs (607) are both provided on the inner side of the wire-changing limiter (606).

2. The automatic wire changing device according to claim 1, characterized in that: The wire-changing locking mechanism comprises: a broken wire detector (101) and a broken wire buzzer (102); two groups of the broken wire detector (101) are provided, and the two groups of broken wire detectors (101) are respectively fixedly connected to the left and right sides above the wire-changing fixing frame (5); the plastic wire passes through the broken wire detector (101) and is inserted into the interior of the wire-changing auxiliary box (6); two groups of the broken wire buzzer (102) are provided, and the two groups of broken wire buzzers (102) are respectively fixedly connected to the front end of the broken wire detector (101), and the two groups of broken wire buzzers (102) are both electrically connected to the control circuit of the broken wire detector (101).

3. The automatic wire changing device according to claim 2, characterized in that: The wire-changing locking mechanism further comprises: a replacement connecting rod (103) and a replacement support plate (104); the replacement connecting rod (103) is provided with a plurality of groups, and the plurality of groups of replacement connecting rods (103) are respectively hinged on the outer periphery of the wire reel support shaft (3); the replacement support plate (104) is provided with a total of four groups, and the four groups of replacement support plates (104) are all tile-shaped plate structures, and the four groups of replacement support plates (104) are respectively hinged on the outer side of the replacement connecting rod (103), and the plurality of groups of replacement connecting rods (103) and the replacement support plates (104) together form a parallelogram structure.

4. The automatic wire changing device according to claim 3, characterized in that: The wire replacement locking mechanism further comprises: a replacement fixing plate (105), a replacement driving plate (106), a replacement clamping spring (107), a replacement electromagnet (108) and a replacement magnet (109); the replacement fixing plate (105) is fixedly connected to the front end of the outer periphery of the plastic wire reel body (4); the replacement driving plate (106) is slidably connected to the rear of the replacement fixing plate (105); the replacement clamping spring (107) is provided in four groups, and the four groups of replacement clamping springs (107) are respectively The front ends of the four groups of replacement clamping springs (107) are fixedly connected to the replacement fixed plate (105); the replacement electromagnet (108) is fixedly connected above the replacement fixed plate (105); the replacement electromagnet (108) is connected in series with the circuit of the broken wire buzzer (102); the replacement magnet (109) is fixedly connected above the replacement drive plate (106); the replacement magnet (109) is magnetically connected to the replacement electromagnet (108).

5. The automatic wire changing device according to claim 4, characterized in that: The wire-changing locking mechanism further comprises: a replacement drive rack (110) and a replacement drive gear (111); the replacement drive rack (110) is provided in four groups, and the four groups of replacement drive racks (110) are respectively fixedly connected to the rear end of the replacement drive plate (106); the replacement drive gear (111) is provided in four groups, and the four groups of replacement drive gears (111) are respectively coaxially fixedly connected to the outer side of the rotating shaft of the four groups of replacement connecting rods (103) at the rear, and the four groups of replacement drive gears (111) are respectively engaged with the replacement drive rack (110).

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