Wire material changing and switching mechanism and 3D printer

Abstract

The utility model provides a silk material changing switching mechanism and a 3D printer, and relates to the technical field of 3D printing, the silk material changing switching mechanism provided by the utility model comprises a driving assembly, a silk material winding assembly, a silk feeding assembly and a gear shifting assembly; the gear shifting assembly is connected with the driving assembly in a matched mode, the driving assembly is driven by the gear shifting assembly to switch station states, the driving assembly is in transmission connection with the wire feeding assembly in the wire feeding station state, and the driving assembly is in transmission connection with the wire winding assembly in the wire withdrawing station state. In the neutral gear station state, the driving assembly is separated from the wire winding assembly and the wire feeding assembly, the multiple sets of driving assemblies do not need to be switched and started, wire feeding and wire withdrawing actions can be achieved through gear switching, the equipment structure is more compact, the occupied space is smaller, and the equipment manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a wire material changing switching mechanism and a 3D printer. Background Art

[0002] In multi-filament 3D printing, multiple feed channels need to be set at the nozzle, and an extruder is configured separately for each filament tray. When switching between multiple filaments, the extruder corresponding to the original filament needs to be reversed to withdraw the filament, so that the original filament is pushed out of the discharge channel, and then the extruder corresponding to the new filament is started. The filament switching and withdrawing process is relatively cumbersome, and the equipment structure is complex and the equipment cost is high. Utility Model Content

[0003] The utility model aims to provide a wire material changing and switching mechanism and a 3D printer, so as to alleviate the technical problems of low wire material switching and wire withdrawal efficiency during printing.

[0004] In a first aspect, the present invention provides a wire material changing and switching mechanism, comprising: a driving assembly, a wire material winding assembly, a wire feeding assembly and a shifting assembly;

[0005] The shift assembly is connected with the driving assembly, and the shift assembly is used to drive the driving assembly to switch the working position state;

[0006] In the wire feeding station state, the driving assembly is transmission-connected with the wire feeding assembly;

[0007] In the wire-retracting station state, the driving assembly is in transmission connection with the wire winding assembly;

[0008] In the neutral position state, the driving assembly is disengaged from the wire winding assembly and the wire feeding assembly.

[0009] In combination with the first aspect, the utility model provides a first possible implementation of the first aspect, wherein the driving assembly includes: a power source, a swing frame, a first engaging gear and a second engaging gear;

[0010] The swing frame is pivotally connected to the power source, the first engaging gear and the second engaging gear are respectively mounted on the swing frame, and the first engaging gear and the second engaging gear are respectively transmission-connected to the power source;

[0011] The shift assembly is transmission-connected to the swing frame;

[0012] In the wire feeding station state, the first engaging gear is meshed with the wire feeding assembly, and in the wire withdrawing station state, the second engaging gear is meshed with the wire winding assembly.

[0013] In combination with the first possible implementation of the first aspect, the utility model provides a second possible implementation of the first aspect, wherein the shift assembly includes: a swing drive member and a shift fork, the swing drive member is connected to the shift fork, and the shift fork is transmission-connected to the swing frame.

[0014] In combination with the first possible implementation of the first aspect, the utility model provides a third possible implementation of the first aspect, wherein the power source includes: an electric motor, a transmission shaft and a central gear;

[0015] The motor is drivingly connected to the transmission shaft, and the central gear is connected to the transmission shaft;

[0016] The swing frame is pivotally connected to the transmission shaft around the axis of the transmission shaft. The first engaging gear and the second engaging gear are arranged at intervals along the circumference of the transmission shaft and are respectively meshed with the central gear.

[0017] In combination with the first aspect, the utility model provides a fourth possible implementation of the first aspect, wherein the wire winding assembly comprises: a base, a wire withdrawal roller, a driven roller and a material roll;

[0018] The wire withdrawal roller and the driven roller are rotatably mounted on the base respectively;

[0019] The wire withdrawal roller, the driven roller and the material roll axis are arranged in parallel, and the wire withdrawal roller and the driven roller abut against the material roll through the circumferential surface respectively;

[0020] In the wire withdrawal position, the drive assembly is in driving engagement with the wire withdrawal roller.

[0021] In combination with the first aspect, the utility model provides a fifth possible implementation of the first aspect, wherein the wire feeding assembly comprises: a wire feeding cavity housing, a wire feeding rotor and a roller;

[0022] The wire feeding rotor and the roller are parallel and rotatably connected to the wire feeding chamber housing respectively, so that the wire material is clamped between the wire feeding rotor and the roller;

[0023] In the wire feeding station state, the driving assembly is in driving engagement with the wire feeding rotor.

[0024] In combination with the fifth possible implementation of the first aspect, the utility model provides a sixth possible implementation of the first aspect, wherein the wire feeding rotor comprises: a wire feeding wheel shaft and a wire feeding gear connected to the wire feeding wheel shaft;

[0025] The wire feeding gear is compatible with the driving assembly;

[0026] The wire feeding wheel shaft is provided with a wire feeding wheel, the circumference of the wire feeding wheel is provided with knurling, and a wire material clamping area is formed between the wire feeding wheel and the roller.

[0027] In combination with the first aspect, the utility model provides a seventh possible implementation of the first aspect, wherein the wire material change switching mechanism further comprises: a wire feeding assembly arranged downstream of the wire feeding assembly;

[0028] The wire feeding assembly comprises a wire feeding channel and a plurality of branch channels, wherein the plurality of branch channels converge and are connected to the wire feeding channel, and the wire material extends to the wire material winding assembly through the wire feeding channel, the branch channels and the wire feeding assembly in sequence.

[0029] In combination with the seventh possible implementation of the first aspect, the utility model provides an eighth possible implementation of the first aspect, wherein the wire feeding assembly includes: a wire feeding motor, an active wire feeding wheel, a driven wire feeding wheel and a wire feeding stroke sensor;

[0030] The active wire feeding wheel is connected to the wire feeding motor in a transmission manner, the active wire feeding wheel is parallel to the driven wire feeding wheel, and a wire feeding channel is formed between the active wire feeding wheel and the driven wire feeding wheel;

[0031] The wire feeding stroke sensor is matched with the wire feeding motor, one of the active wire feeding wheel and the driven wire feeding wheel to detect the wire feeding stroke.

[0032] In a second aspect, the 3D printer provided by the present invention is equipped with the filament material changing and switching mechanism described in the first aspect.

[0033] The embodiments of the utility model bring the following beneficial effects: the shifting assembly is connected with the driving assembly, and the shifting assembly is used to drive the driving assembly to switch the working position state. In the wire feeding position state, the driving assembly is transmission-connected with the wire feeding assembly, and in the wire retracting position state, the driving assembly is transmission-connected with the wire winding assembly, and in the neutral position state, the driving assembly is disengaged from the wire winding assembly and the wire feeding assembly. There is no need to switch and start multiple groups of driving assemblies, and the wire feeding and retracting actions can be achieved by gear switching. The equipment structure is more compact, occupies less space, and reduces the equipment manufacturing cost.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 A schematic diagram of a wire material changing and switching mechanism provided in an embodiment of the utility model;

[0037] Figure 2 A left side view of the wire material changing switching mechanism provided by an embodiment of the utility model;

[0038] Figure 3 A schematic diagram of a drive assembly and a shift assembly of a wire material switching mechanism provided in an embodiment of the utility model;

[0039] Figure 4 A schematic diagram of a drive assembly of a wire material changing switching mechanism provided in an embodiment of the utility model;

[0040] Figure 5 A schematic diagram of the partial position relationship of the drive assembly, the wire winding assembly, the wire feeding assembly and the shift assembly of the wire material changing switching mechanism provided by the embodiment of the utility model in the wire feeding station state;

[0041] Figure 6 A schematic diagram of the partial position relationship of the drive assembly, the wire winding assembly, the wire feeding assembly and the shift assembly of the wire material changing switching mechanism provided by an embodiment of the utility model in the wire withdrawing position state;

[0042] Figure 7 A schematic diagram of the partial position relationship of the drive assembly, the wire winding assembly, the wire feeding assembly and the shift assembly of the wire material changing switching mechanism provided by the embodiment of the utility model in the neutral position state;

[0043] Figure 8 An exploded view of a wire feeding assembly of a wire material changing switching mechanism provided in an embodiment of the utility model;

[0044] Fig. 9 A half-section schematic diagram of a wire feeding assembly of a wire material changing switching mechanism provided in an embodiment of the utility model.

[0045] Icons: 100 - drive assembly; 110 - power source; 111 - motor; 112 - transmission shaft; 113 - central gear; 120 - swing frame; 130 - first engagement gear; 140 - second engagement gear; 200 - wire winding assembly; 210 - base; 220 - wire withdrawal roller; 230 - driven roller; 240 - material roll; 300 - wire feeding assembly; 310 - wire feeding chamber shell; 320 - wire feeding rotor; 3 21-wire feed wheel shaft; 322-wire feed gear; 330-roller; 400-shift assembly; 410-swing drive; 420-shift fork; 500-wire feed assembly; 501-wire feed channel; 502-branch channel; 510-wire feed motor; 520-active wire feed wheel; 530-driven wire feed wheel; 540-wire feed stroke sensor; 541-Hall device; 542-mileage wheel; 543-magnet. DETAILED DESCRIPTION

[0046] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used to describe the difference in names, and cannot be understood as indicating or implying relative importance. The physical quantities in the formula, if not separately marked, should be understood as basic quantities of the basic units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] like Figure 1 and Figure 3 As shown, the wire material changing switching mechanism provided by the embodiment of the utility model includes: a driving assembly 100, a wire winding assembly 200, a wire feeding assembly 300 and a shift assembly 400; the shift assembly 400 is connected with the driving assembly 100, and the shift assembly 400 is used to drive the driving assembly 100 to switch the workstation state.

[0050] In the wire feeding station state, the driving assembly 100 is transmission-connected with the wire feeding assembly 300, and the driving assembly 100 can drive the wire feeding assembly 300 to perform the wire feeding action.

[0051] In the wire retracting station state, the driving assembly 100 is transmission-connected to the wire winding assembly 200 , and the driving assembly 100 can drive the wire winding assembly 200 to realize the wire retracting action by winding the wire.

[0052] In the neutral position state, the driving assembly 100 is separated from the wire winding assembly 200 and the wire feeding assembly 300. At this time, the wire winding assembly 200 and the wire feeding assembly 300 are not driven by the driving assembly 100.

[0053] It should be noted that the wire winding assembly 200 and the wire feeding assembly 300 are both driven by the driving assembly 100, and the wire feeding and wire retracting actions can be realized only by switching the workstation state of the shift assembly 400, and the device structure is more compact. In addition, multiple shift assemblies 400 can be configured along the driving assembly 100, and each shift assembly 400 corresponds to a set of wire winding assemblies 200 and wire feeding assemblies 300, so as to further improve the integration and compactness of the device, thereby reducing the space size occupied by the device and reducing the device cost.

[0054] like Figure 1 , Figure 3 and Figure 4 As shown, in an embodiment of the utility model, the driving assembly 100 includes: a power source 110, a swing frame 120, a first engaging gear 130 and a second engaging gear 140; the swing frame 120 is pivotally connected to the power source 110, the first engaging gear 130 and the second engaging gear 140 are respectively mounted on the swing frame 120, and the first engaging gear 130 and the second engaging gear 140 are respectively transmission-connected to the power source 110; the shifting assembly 400 is transmission-connected to the swing frame 120; in the wire feeding station state, the first engaging gear 130 is meshed with the wire feeding assembly 300, and in the wire withdrawing station state, the second engaging gear 140 is meshed with the wire winding assembly 200.

[0055] In this embodiment, the power source 110 includes: an electric motor 111, a transmission shaft 112 and a center gear 113; the electric motor 111 is transmission-connected to the transmission shaft 112, and the center gear 113 is connected to the transmission shaft 112; the swing frame 120 is pivotally connected to the transmission shaft 112 around the axis of the transmission shaft 112, and the first coupling gear 130 and the second coupling gear 140 are arranged at intervals along the circumference of the transmission shaft 112 and are respectively meshed with the center gear 113.

[0056] Among them, the motor 111 can achieve speed reduction and torque increase through gear transmission, and drive the transmission shaft 112 to rotate. Multiple center gears 113 can be installed on the transmission shaft 112. Each center gear 113 corresponds to a group of swing frames 120, a first engaging gear 130 and a second engaging gear 140, and the transmission state switching with the wire winding assembly 200 and the wire feeding assembly 300 can be achieved through the shifting assembly 400 respectively.

[0057] like Figure 3 As shown, the shift assembly 400 includes: a swing driving member 410 and a shift fork 420 , the swing driving member 410 is connected to the shift fork 420 , and the shift fork 420 is transmission-connected to the swing frame 120 .

[0058] The swing drive member 410 may be a motor or a servo, and is connected to the fork 420 in a transmission manner, so as to drive the fork 420 to swing back and forth. The fork 420 cooperates with the swing frame 120, so as to drive the swing frame 120 to swing around the transmission shaft 112.

[0059] like Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, the wire winding assembly 200 includes: a base 210, a wire withdrawal roller 220, a driven roller 230 and a material roll 240; the wire withdrawal roller 220 and the driven roller 230 are rotatably installed on the base 210 respectively; the wire withdrawal roller 220, the driven roller 230 and the material roll 240 are arranged with parallel axes, and the wire withdrawal roller 220 and the driven roller 230 abut the material roll 240 respectively through the circumferential surface; in the wire withdrawal station state, the driving assembly 100 is transmission-engaged with the wire withdrawal roller 220.

[0060] The wire withdrawal roller 220 contacts the material roll 240 through the circumferential side of the shaft portion, and the wire withdrawal roller 220 is provided with a gear portion adapted to the first engaging gear 130. When the first engaging gear 130 meshes with the gear portion of the wire withdrawal roller 220 (see Figure 6 ), the first engaging gear 130 can drive the wire withdrawal roller 220 to rotate forward or reverse, and further drive the material roll 240 to rotate forward or reverse.

[0061] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the wire feeding assembly 300 includes: a wire feeding chamber shell 310, a wire feeding rotor 320 and a roller 330; the wire feeding rotor 320 and the roller 330 are parallel and respectively rotatably connected to the wire feeding chamber shell 310, so that the wire material is clamped between the wire feeding rotor 320 and the roller 330; in the wire feeding station state, the driving assembly 100 is transmission-engaged with the wire feeding rotor 320.

[0062] Specifically, in the wire feeding station state, the first engaging gear 130 is in transmission cooperation with the wire feeding rotor 320, so as to drive the wire feeding rotor 320 to rotate. When the wire feeding rotor 320 rotates, the friction force on the wire material can drive the wire material to be transported, and the wire feeding rotor 320 and the roller 330 can rotate synchronously, so as to reduce the resistance of the wire material transportation.

[0063] In this embodiment, the wire feeding rotor 320 includes: a wire feeding wheel shaft 321 and a wire feeding gear 322 connected to the wire feeding wheel shaft 321; the wire feeding gear 322 is compatible with the driving assembly 100; the wire feeding wheel shaft 321 is provided with a wire feeding wheel, the circumference of the wire feeding wheel is provided with knurling, and a wire clamping area is formed between the wire feeding wheel and the roller 330. The wire is clamped in the clamping area by the wire feeding wheel and the roller 330, thereby increasing the friction between the wire feeding wheel and the wire, thereby preventing the wire from slipping during the wire feeding action.

[0064] like Figure 2 , Figure 3 and Fig. 9 As shown, the wire material changing switching mechanism also includes: a wire feeding assembly 500 arranged downstream of the wire feeding assembly 300; the wire feeding assembly 500 has a wire feeding channel 501 and a plurality of branch channels 502, and the plurality of branch channels 502 converge and connect to the wire feeding channel 501, and the wire material extends to the wire winding assembly 200 through the wire feeding channel 501, the branch channels 502 and the wire feeding assembly 300 in sequence.

[0065] Multiple material rolls 240 can be respectively wound and store different wire materials, and the multiple wire materials correspond to multiple branch channels 502 one by one. A wire feeding assembly 300, a wire winding assembly 200 and a shifting assembly 400 are arranged between each group of material rolls 240 and the branch channels 502, so as to realize the gear switching of the wire feeding station state, the wire retracting station state and the neutral station state respectively.

[0066] Furthermore, the wire feeding assembly 500 includes: a wire feeding motor 510, an active wire feeding wheel 520, a driven wire feeding wheel 530 and a wire feeding stroke sensor 540; the active wire feeding wheel 520 is transmission-connected to the wire feeding motor 510, the active wire feeding wheel 520 is parallel to the driven wire feeding wheel 530, and a wire feeding channel 501 is formed between the active wire feeding wheel 520 and the driven wire feeding wheel 530; the wire feeding stroke sensor 540 cooperates with one of the wire feeding motor 510, the active wire feeding wheel 520 and the driven wire feeding wheel 530 to detect the wire feeding stroke.

[0067] When switching the wire material, the wire feeding assembly 300 for conveying the original wire material is driven in the reverse direction by the driving assembly 100, or the material roll 240 corresponding to the original wire material is driven to rotate to wind the original wire material, so that the original wire material is no longer continuously supplied to the wire feeding channel 501; the wire feeding assembly 300 corresponding to the new wire material pulls the new wire material into the wire feeding channel 501, and under the clamping of the active wire feeding wheel 520 and the driven wire feeding wheel 530 and the action of friction, the new wire material can be conveyed when the active wire feeding wheel 520 is driven to rotate. The wire feeding stroke sensor 540 can use a device such as a photoelectric encoder to detect the rotation signal of one of the wire feeding motor 510, the active wire feeding wheel 520 and the driven wire feeding wheel 530, and then the length of the wire feeding or wire withdrawal can be calculated.

[0068] In this embodiment, the wire feeding stroke sensor 540 includes: a Hall device 541, a mileage wheel 542 and a magnet 543. The Hall device 541 is installed on the frame, and the circumferential side of the Hall device 541 and the mileage wheel 542 are opposite. The magnet 543 is connected to the mileage wheel 542 at a position deviating from the axis, and the mileage wheel 542 is transmission-connected to the driven wire feeding wheel 530. This time, by detecting the number of excitation signals generated by the Hall device 541 under the influence of the magnet 543, the number of rotations of the driven wire feeding wheel 530 can be known, which can be used to calculate the length of the wire feeding or retracting.

[0069] like Figure 1 and Figure 2 As shown, the 3D printer provided by the embodiment of the utility model is equipped with the wire material changing switching mechanism described in the above-mentioned embodiment. The 3D printer has the technical advantages of the above-mentioned wire material changing switching mechanism, which will not be repeated here.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A wire material switching mechanism, characterized in that: include: A driving assembly (100), a wire winding assembly (200), a wire feeding assembly (300) and a gear shifting assembly (400); The shift assembly (400) is cooperatively connected with the drive assembly (100), and the shift assembly (400) is used to drive the drive assembly (100) to switch the working position state; In the wire feeding station state, the driving assembly (100) is transmission-connected with the wire feeding assembly (300); In the wire-retracting station state, the driving assembly (100) is in transmission connection with the wire winding assembly (200); In the neutral position state, the driving assembly (100) is separated from the wire winding assembly (200) and the wire feeding assembly (300).

2. The wire material changing and switching mechanism according to claim 1, characterized in that: The driving assembly (100) comprises: a power source (110), a swing frame (120), a first engaging gear (130) and a second engaging gear (140); The swing frame (120) is pivotally connected to the power source (110), the first engaging gear (130) and the second engaging gear (140) are respectively mounted on the swing frame (120), and the first engaging gear (130) and the second engaging gear (140) are respectively transmission-connected to the power source (110); The shift assembly (400) is transmission-connected to the swing frame (120); In the wire feeding station state, the first engaging gear (130) is meshed with the wire feeding assembly (300), and in the wire withdrawing station state, the second engaging gear (140) is meshed with the wire winding assembly (200).

3. The wire material changing and switching mechanism according to claim 2, characterized in that: The gear shift assembly (400) comprises: a swing driving member (410) and a shift fork (420); the swing driving member (410) is connected to the shift fork (420); and the shift fork (420) is transmission-connected to the swing frame (120).

4. The wire material changing and switching mechanism according to claim 2, characterized in that: The power source (110) comprises: an electric motor (111), a transmission shaft (112) and a central gear (113); The motor (111) is in transmission connection with the transmission shaft (112), and the central gear (113) is connected to the transmission shaft (112); The swing frame (120) is pivotally connected to the transmission shaft (112) around the axis of the transmission shaft (112); the first engaging gear (130) and the second engaging gear (140) are arranged at intervals along the circumference of the transmission shaft (112) and are respectively meshed with the central gear (113).

5. The wire material changing and switching mechanism according to claim 1, characterized in that: The wire winding assembly (200) comprises: a base (210), a wire withdrawal roller (220), a driven roller (230) and a material roll (240); The wire withdrawal roller (220) and the driven roller (230) are rotatably mounted on the base (210) respectively; The axes of the wire withdrawal roller (220), the driven roller (230) and the material roll (240) are arranged in parallel, and the wire withdrawal roller (220) and the driven roller (230) respectively abut against the material roll (240) through circumferential surfaces; In the wire withdrawal position state, the driving assembly (100) is in driving engagement with the wire withdrawal roller (220).

6. The wire material changing and switching mechanism according to claim 1, characterized in that: The wire feeding assembly (300) comprises: a wire feeding chamber housing (310), a wire feeding rotor (320) and a roller (330); The wire feeding rotor (320) and the roller (330) are parallel and respectively rotatably connected to the wire feeding chamber housing (310), so that the wire material is clamped between the wire feeding rotor (320) and the roller (330); In the wire feeding station state, the driving assembly (100) is in transmission engagement with the wire feeding rotor (320).

7. The wire material changing and switching mechanism according to claim 6, characterized in that: The wire feeding rotor (320) comprises: a wire feeding wheel shaft (321) and a wire feeding gear (322) connected to the wire feeding wheel shaft (321); The wire feeding gear (322) is adapted to the driving assembly (100); The wire feeding wheel shaft (321) is provided with a wire feeding wheel, the circumference of the wire feeding wheel is provided with knurling, and a wire material clamping area is formed between the wire feeding wheel and the roller (330).

8. The wire material changing and switching mechanism according to claim 1, characterized in that: The wire material changing switching mechanism further comprises: a wire feeding assembly (500) arranged downstream of the wire feeding assembly (300); The wire feeding assembly (500) comprises a wire feeding channel (501) and a plurality of branch channels (502), wherein the plurality of branch channels (502) converge and are connected to the wire feeding channel (501), and the wire material extends to the wire winding assembly (200) in sequence through the wire feeding channel (501), the branch channels (502) and the wire feeding assembly (300).

9. The wire material changing and switching mechanism according to claim 8, characterized in that: The wire feeding assembly (500) comprises: a wire feeding motor (510), an active wire feeding wheel (520), a driven wire feeding wheel (530) and a wire feeding stroke sensor (540); The active wire feeding wheel (520) is transmission-connected to the wire feeding motor (510), the active wire feeding wheel (520) is parallel to the driven wire feeding wheel (530), and the wire feeding channel (501) is formed between the active wire feeding wheel (520) and the driven wire feeding wheel (530); The wire feeding stroke sensor (540) is matched with one of the wire feeding motor (510), the active wire feeding wheel (520) and the driven wire feeding wheel (530) to detect the wire feeding stroke.

10. A 3D printer, characterized in that: The 3D printer is equipped with the filament material switching mechanism according to any one of claims 1 to 9.

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