Transmission structure for 3D printer and 3D printer

Abstract

The utility model relates to the technical field of 3D printing, and provides a transmission structure 3D printer for a 3D printer, which comprises an X-direction slide rail, a Y-direction slide rail, an upper-layer synchronous belt mechanism and a lower-layer synchronous belt mechanism, the upper-layer synchronous belt mechanism and the lower-layer synchronous belt mechanism are both connected with a spray head assembly of the 3D printer and drive the spray head assembly of the 3D printer to move along the X-direction sliding rail and / or the Y-direction sliding rail. An upper-layer synchronous belt mechanism and a lower-layer synchronous belt mechanism are arranged to drive a spray head assembly of the 3D printer to rotate, and an upper-layer driving wheel and a lower-layer driving wheel are adjacently arranged and arranged on one side of one end of a Y-direction sliding rail, so that the moving range of the spray head assembly is not affected, the space utilization rate is increased, and the structural compactness is improved; the structure compactness of the 3D printer is improved; according to the utility model, the tensioning device is arranged for adjusting the tightness of the synchronous belt so as to adapt to printers with different sizes.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a transmission structure 3D printer used for a 3D printer. Background Art

[0002] In the FDM (fused deposition modeling) 3D printer, hot melt filaments are "deposited" onto the printing platform to gradually form during the printing process. Existing 3D printers usually include a 3D printer housing with an observation glass, a 3D printing nozzle assembly disposed inside the 3D printer housing, and a 3D printing workbench mechanism and moving parts disposed below the 3D printing nozzle assembly.

[0003] Due to the small size of 3D printers, how to allow the printing nozzle to have sufficient range of movement within a limited range is a technical problem that needs to be solved urgently. Utility Model Content

[0004] In order to solve the above problems, the utility model provides the following technical solutions:

[0005] The utility model provides a transmission structure for a 3D printer, comprising an X-direction slide rail, a Y-direction slide rail, an upper synchronous belt mechanism and a lower synchronous belt mechanism, wherein the upper synchronous belt mechanism and the lower synchronous belt mechanism are both connected to a nozzle assembly of the 3D printer and drive the nozzle assembly of the 3D printer to move along the X-direction slide rail and / or the Y-direction slide rail.

[0006] Preferably, a second slider is provided on the X-axis slide rail, and the nozzle assembly of the 3D printer is fixedly connected to the second slider. The nozzle assembly of the 3D printer moves along the X-axis slide rail and / or the Y-axis slide rail under the action of the second slider and the upper synchronous belt mechanism and the lower synchronous belt mechanism.

[0007] Further, the upper synchronous belt mechanism includes an upper synchronous belt, an upper driving wheel and an upper guide wheel; the upper synchronous belt includes an upper first section synchronous belt, an upper second section synchronous belt, an upper third section synchronous belt, an upper fourth section synchronous belt, an upper fifth section synchronous belt, an upper sixth section synchronous belt, an upper seventh section synchronous belt and an upper eighth section synchronous belt connected in sequence end to end;

[0008] The upper driving wheel is arranged between the fifth section of the upper synchronous belt and the sixth section of the upper synchronous belt;

[0009] The upper guide wheels include an upper first guide wheel arranged between an upper first section synchronous belt and an upper second section synchronous belt, an upper second guide wheel between an upper second section synchronous belt and an upper third section synchronous belt, an upper third guide wheel between an upper third section synchronous belt and an upper fourth section synchronous belt, an upper fourth guide wheel between an upper fourth section synchronous belt and an upper fifth section synchronous belt, an upper fifth guide wheel between an upper sixth section synchronous belt and an upper seventh section synchronous belt, and an upper sixth guide wheel between an upper seventh section synchronous belt and an upper eighth section synchronous belt.

[0010] Further, the lower synchronous belt mechanism includes a lower synchronous belt, a lower driving wheel and a lower guide wheel; the lower synchronous belt includes a lower first synchronous belt section, a lower second synchronous belt section, a lower third synchronous belt section, a lower fourth synchronous belt section, a lower fifth synchronous belt section, a lower sixth synchronous belt section, a lower seventh synchronous belt section and a lower eighth synchronous belt section connected in sequence end to end;

[0011] The lower driving wheel is arranged between the fifth synchronous belt section and the sixth synchronous belt section of the lower layer;

[0012] The lower guide wheels include a lower first guide wheel arranged between the lower first section synchronous belt and the lower second section synchronous belt, a lower second guide wheel between the lower second section synchronous belt and the lower third section synchronous belt, a lower third guide wheel between the lower third section synchronous belt and the lower fourth section synchronous belt, a lower fourth guide wheel between the lower fourth section synchronous belt and the lower fifth section synchronous belt, a lower fifth guide wheel between the lower sixth section synchronous belt and the lower seventh section synchronous belt, and a lower sixth guide wheel between the lower seventh section synchronous belt and the lower eighth section synchronous belt.

[0013] Preferably, the upper driving wheel and the lower driving wheel are both connected to a motor or other driving device to drive the upper synchronous belt and the lower synchronous belt to transmit.

[0014] Furthermore, the upper driving wheel and the lower driving wheel are arranged adjacent to each other and are arranged on one side of one end of the Y-direction slide rail.

[0015] Furthermore, the upper first guide wheel and the upper driving wheel are located outside the loop formed by the upper synchronous belt.

[0016] Furthermore, the first guide wheel of the lower layer and the fourth guide wheel of the lower layer are located outside the loop formed by the lower synchronous belt.

[0017] Further, the arrangement directions of the first section of the upper synchronous belt, the eighth section of the upper synchronous belt, the first section of the lower synchronous belt and the eighth section of the lower synchronous belt are consistent with the arrangement direction of the X-direction slide rail;

[0018] The setting directions of the upper second section synchronous belt, the upper third section synchronous belt, the upper seventh section synchronous belt, the lower second section synchronous belt, the lower third section synchronous belt and the lower seventh section synchronous belt are consistent with the setting direction of the Y-direction slide rail.

[0019] Furthermore, the transmission structure also includes a connecting device, which is configured to move with the X-axis slide rail and along the Y-axis slide rail under the action of the upper synchronous belt mechanism and the lower synchronous belt mechanism.

[0020] Furthermore, the connecting device includes a slide rail placing part, a first connecting part, a second connecting part and a first supporting part. The two ends of the slide rail placing part are provided with a first connecting part and a first supporting part. The first connecting part is connected to the slide rail placing part and / or the first supporting part, and the second connecting part is connected to the first supporting part. At least one second connecting part is provided with a baffle for resisting the sliding block to eliminate the gap between the third sliding block and the Y-axis sliding rail.

[0021] Furthermore, the slide rail placement portion is provided with a first placement groove, the first placement groove is used to place the X-direction slide rail, and the X-direction slide rail is placed in the first placement groove and fixed to the slide rail placement portion.

[0022] Furthermore, the upper first guide wheel and the lower sixth guide wheel, as well as the upper sixth guide wheel and the lower first guide wheel are all arranged on the first connecting portion.

[0023] Furthermore, it also includes a tensioning device, the upper second guide wheel and the lower second guide wheel are both arranged on the tensioning device, and the tensioning device is configured to adjust the positions of the upper second guide wheel and the lower second guide wheel. Preferably, the tensioning device includes a base, a first slider and a fastener, the base is provided with a second placement groove, the first slider is placed in the second placement groove and can slide in the base, the base and the first slider can be fixed by a fastener, and the tightness of the synchronous belt can be adjusted by adjusting the position of the first slider in the second placement groove; preferably, in order to match the setting position of the guide wheel, the first slider is provided with a second support portion for connecting with the guide wheel.

[0024] The utility model also provides a 3D printer, including a base plate and the above-mentioned transmission structure; the transmission structure includes an X-axis slide rail, a Y-axis slide rail, a connecting device, an upper synchronous belt mechanism and a lower synchronous belt mechanism, and the Y-axis slide rail is arranged on the base plate; the X-axis slide rail is connected to the connecting device, and moves on the Y-axis slide rail driven by the upper synchronous belt mechanism and the lower synchronous belt mechanism. Furthermore, the base plate is also provided with a feed port for feeding materials in the direction of the nozzle assembly of the 3D printer, and the feed port is arranged on the base plate away from the upper driving wheel and the lower driving wheel side to ensure that there is enough bending space for the conduit from the feed port to the nozzle assembly. Preferably, the base plate is a circular base plate, and the use area of ​​the base plate can be fully utilized by using the transmission structure of the present application.

[0025] The utility model has the following beneficial effects:

[0026] (1) The utility model is provided with an upper synchronous belt mechanism and a lower synchronous belt mechanism to drive the nozzle assembly of the 3D printer to rotate, and the upper driving wheel and the lower driving wheel are arranged adjacent to each other and arranged on one side of one end of the Y-direction slide rail, which does not affect the moving range of the nozzle assembly, thereby improving the space utilization rate and the compactness of the structure, thereby improving the compactness of the structure of the 3D printer;

[0027] (2) The utility model is provided with a tensioning device for adjusting the tightness of the synchronous belt to adapt to printers of different sizes;

[0028] (3) The utility model uses a connecting device to place an X-axis slide rail so that the X-axis slide rail can move on the Y-axis slide rail; on the other hand, multiple guide wheels can be placed to make the overall structure more compact, and a baffle is provided at the second connecting portion to resist the third slider so that the third slider always pushes in one direction to prevent left and right shaking and eliminate the gap between the third slider and the Y-axis slide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the transmission structure of Example 1.

[0030] Figure 2 Schematic diagram of the upper synchronous belt mechanism in Example 1.

[0031] Figure 3 Schematic diagram of the upper synchronous belt mechanism in Example 1.

[0032] Figure 4 Schematic diagram of the connection device in Example 1.

[0033] Figure 5 Schematic diagram of the tensioning device in Example 1.

[0034] Figure 6It is a schematic diagram of the transmission structure with a base plate in Example 2. DETAILED DESCRIPTION

[0035] The specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. It should be pointed out that the embodiments are only specific explanations of the utility model and should not be regarded as limitations of the utility model. The purpose of the embodiments is to enable those skilled in the art to better understand and reproduce the technical solutions of the utility model. The protection scope of the utility model shall still be based on the scope defined in the claims.

[0036] Example 1

[0037] This embodiment provides a transmission structure for a 3D printer.

[0038] like Figure 1 As shown, the transmission structure includes an X-axis slide rail 1, a Y-axis slide rail 2, an upper synchronous belt mechanism 3 and a lower synchronous belt mechanism 4. The upper synchronous belt mechanism 3 and the lower synchronous belt mechanism 4 are both connected to the nozzle assembly 5 of the 3D printer and drive the nozzle assembly of the 3D printer to move along the X-axis slide rail and / or the Y-axis slide rail.

[0039] Preferably, the nozzle assembly 5 of the 3D printer includes a nozzle mechanism, a heat sink, a housing, a second extruder motor, a printing fixed plate, etc. The nozzle mechanism includes a hot end (heater) and a nozzle. The second extruder motor is provided at the bottom of the printing fixed plate, and the nozzle can be connected to the second extruder motor.

[0040] Preferably, a second slider is provided on the X-axis slide rail 1, and the nozzle assembly 5 of the 3D printer is fixedly connected to the second slider. The nozzle assembly 5 of the 3D printer moves along the X-axis slide rail 1 and / or the Y-axis slide rail 2 under the action of the second slider and the upper synchronous belt mechanism 3 and the lower synchronous belt mechanism 4.

[0041] like Figure 2 As shown, the upper synchronous belt mechanism 3 includes an upper synchronous belt 31, an upper driving wheel 32 and an upper guide wheel 33; the upper synchronous belt 31 includes an upper first-section synchronous belt 311, an upper second-section synchronous belt 312, an upper third-section synchronous belt 313, an upper fourth-section synchronous belt 314, an upper fifth-section synchronous belt 315, an upper sixth-section synchronous belt 316, an upper seventh-section synchronous belt 317 and an upper eighth-section synchronous belt 318 which are connected in sequence end to end; preferably, the upper first-section synchronous belt 311 and the upper eighth-section synchronous belt 318 can be connected to the nozzle assembly 5 of the 3D printer or can be connected to the nozzle assembly 5 of the 3D printer separately.

[0042] The upper driving wheel 32 is arranged between the upper fifth section synchronous belt 315 and the upper sixth section synchronous belt 316;

[0043] The upper guide wheel 33 includes an upper first guide wheel 331 arranged between the upper first section synchronous belt 311 and the upper second section synchronous belt 312, an upper second guide wheel 332 between the upper second section synchronous belt 312 and the upper third section synchronous belt 313, an upper third guide wheel 333 between the upper third section synchronous belt 313 and the upper fourth section synchronous belt 314, an upper fourth guide wheel 334 between the upper fourth section synchronous belt 314 and the upper fifth section 315 synchronous belt, an upper fifth guide wheel 335 between the upper sixth section synchronous belt 316 and the upper seventh section synchronous belt 317, and an upper sixth guide wheel 336 between the upper seventh section synchronous belt 317 and the upper eighth section synchronous belt 318.

[0044] like Figure 3 As shown, the lower layer synchronous belt mechanism 4 includes a lower layer synchronous belt 41, a lower layer driving wheel 42 and a lower layer guide wheel 43; the lower layer synchronous belt 41 includes a lower layer first section synchronous belt 411, a lower layer second section synchronous belt 412, a lower layer third section synchronous belt 413, a lower layer fourth section synchronous belt 4145, a lower layer fifth section synchronous belt 415, a lower layer sixth section synchronous belt 416, a lower layer seventh section synchronous belt 417 and a lower layer eighth section synchronous belt 418 which are connected in sequence end to end; preferably, the lower layer first section synchronous belt 411 and the lower layer eighth section synchronous belt 418 can be connected to the nozzle assembly 5 of the 3D printer or can be connected to the nozzle assembly 5 of the 3D printer separately.

[0045] The lower driving wheel 42 is arranged between the lower fifth synchronous belt 415 and the lower sixth synchronous belt 416;

[0046] The lower guide wheel 43 includes a lower first guide wheel 431 arranged between the lower first section synchronous belt 411 and the lower second section synchronous belt 412, a lower second guide wheel 432 between the lower second section synchronous belt 412 and the lower third section synchronous belt 413, a lower third guide wheel 433 between the lower third section synchronous belt 413 and the lower fourth section synchronous belt 414, a lower fourth guide wheel 434 between the lower fourth section synchronous belt 414 and the lower fifth section synchronous belt 415, a lower fifth guide wheel 435 between the lower sixth section synchronous belt 416 and the lower seventh section synchronous belt 417, and a lower sixth guide wheel 436 between the lower seventh section synchronous belt 417 and the lower eighth section synchronous belt 418.

[0047] Preferably, the upper driving wheel 32 and the lower driving wheel 42 are both connected to a motor or other driving device to drive the upper synchronous belt 31 and the lower synchronous belt 41 to transport.

[0048] In some preferred embodiments, the upper driving wheel 32 and the lower driving wheel 42 are arranged adjacent to each other and are arranged on one side of one end of the Y-direction slide rail 2 .

[0049] In some preferred embodiments, the upper first guide wheel 331 and the upper driving wheel 32 are located outside the loop formed by the upper synchronous belt 31 .

[0050] In some preferred embodiments, the lower first guide wheel 431 and the lower fourth guide wheel 434 are located outside the loop formed by the lower synchronous belt 41 .

[0051] In some preferred embodiments, the arrangement direction of the upper first-segment synchronous belt 311, the upper eighth-segment synchronous belt 318, the lower first-segment synchronous belt 411 and the lower eighth-segment synchronous belt 418 is consistent with the arrangement direction of the X-direction slide rail 1;

[0052] In some preferred schemes, the setting directions of the upper second section synchronous belt 312, the upper third section synchronous belt 313, the upper seventh section synchronous belt 317, the lower second section synchronous belt 412, the lower third section synchronous belt 413 and the lower seventh section synchronous belt 417 are consistent with the setting direction of the Y-axis slide rail 2.

[0053] Preferably, a third sliding block 20 is provided on the Y-direction sliding rail 2 .

[0054] In some preferred embodiments, the transmission structure further includes a connecting device 6, which is configured to move with the X-axis slide rail and along the Y-axis slide rail 2 under the action of the upper synchronous belt mechanism and the lower synchronous belt mechanism.

[0055] like Figure 4 As shown, the connecting device 6 includes a slide rail placement part 61, a first connecting part 62, a second connecting part 63 and a first supporting part 64. The two ends of the slide rail placement part 61 are provided with a first connecting part 62 and a first supporting part 64. The slide rail placement part 61 is provided with a first placement groove 611, and the first placement groove 611 is used to place the X-direction slide rail; the first connecting part 62 is connected to the slide rail placement part 61 and / or the first supporting part 64, and the second connecting part 63 is connected to the first supporting part 64. At least one second connecting part 63 is provided with a baffle 631, which is used to resist the third slider, so that the third slider always pushes in one direction to prevent left and right shaking, and eliminate the gap between the third slider 20 and the Y-direction slide rail. Specifically, the upper first guide wheel and the lower sixth guide wheel, the upper sixth guide wheel and the lower first guide wheel are all arranged on the first connecting part, the X-direction slide rail is fixed on the slide rail placement part, and the two second connecting parts 63 are respectively connected to the third slider 20 and the second slider. Preferably, in order to better connect the guide rail and the first support part, the first connecting part 62 can be set to a triangle, and the upper first guide wheel and the lower sixth guide wheel or the upper sixth guide wheel and the lower first guide wheel and the first support part are respectively connected to the three vertices of the first connecting part 62.

[0056] Preferably, at least one guide wheel of the upper synchronous belt mechanism 3 is coaxially arranged with at least one guide wheel of the lower synchronous belt mechanism 4 in a one-to-one correspondence. Specifically, the upper third guide wheel 333 and the lower fifth guide wheel 435, and the upper fifth guide wheel 335 and the lower third guide wheel 433 may be coaxially arranged.

[0057] Preferably, the multiple guide wheels of the upper synchronous belt mechanism 3 and the multiple guide wheels of the lower synchronous belt mechanism 4 are symmetrically arranged with respect to the symmetry axis of the Y-direction slide rail 2; for example, the upper first guide wheel 331 and the lower first guide wheel 431 are symmetrically arranged with respect to the symmetry axis; the upper second guide wheel 332 and the lower second guide wheel 432 are symmetrically arranged with respect to the symmetry axis.

[0058] like Figure 5 As shown, it also includes a tensioning device 7, the upper second guide wheel 332 and the lower second guide wheel 432 are both arranged on the tensioning device 7, and the tensioning device 7 is configured to adjust the positions of the upper second guide wheel 332 and the lower second guide wheel 432. Preferably, the tensioning device 7 includes a base 71, a first slider 72 and a fastener 73, the base 71 is provided with a second placement groove 711, the first slider 72 is placed in the second placement groove 711 and can slide in the base 71, the base 71 and the first slider can be fixed by the fastener 73, and the tightness of the synchronous belt can be adjusted by adjusting the position of the first slider 72 in the second placement groove; preferably, in order to match the setting position of the guide wheel, the first slider 72 is provided with a second support portion 721 for connecting with the guide wheel.

[0059] Example 2

[0060] This embodiment provides a 3D printer.

[0061] like Figure 6 As shown, the 3D printer includes a base plate 8 and the transmission structure described in Example 1; the transmission structure includes an X-axis slide rail, a Y-axis slide rail, a connecting device, an upper synchronous belt mechanism and a lower synchronous belt mechanism, and the Y-axis slide rail is arranged on the base plate; the X-axis slide rail is connected to the connecting device, and moves on the Y-axis slide rail driven by the upper synchronous belt mechanism and the lower synchronous belt mechanism. The base plate 8 is also provided with a feed port 81 for feeding materials in the direction of the nozzle assembly 5 of the 3D printer, and the feed port 81 is arranged on the base plate 8 away from the upper driving wheel 32 and the lower driving wheel 42 side, ensuring that there is enough bending space for the conduit from the feed port 81 to the nozzle assembly 5. Preferably, the base plate 8 is a circular base plate, and the use area of ​​the base plate 8 can be fully utilized by using the transmission structure of the present application.

[0062] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0063] It should be noted that the technical features not described in detail in the present invention can be achieved by any existing technology.

Claims

1. A transmission structure for a 3D printer, characterized in that: It includes an X-axis slide rail, a Y-axis slide rail, an upper synchronous belt mechanism and a lower synchronous belt mechanism. The upper synchronous belt mechanism and the lower synchronous belt mechanism are both connected to the nozzle assembly of the 3D printer and drive the nozzle assembly of the 3D printer to move along the X-axis slide rail and / or the Y-axis slide rail.

2. The transmission structure for a 3D printer according to claim 1, characterized in that: The upper synchronous belt mechanism includes an upper synchronous belt, an upper driving wheel and an upper guide wheel; the upper synchronous belt includes an upper first section synchronous belt, an upper second section synchronous belt, an upper third section synchronous belt, an upper fourth section synchronous belt, an upper fifth section synchronous belt, an upper sixth section synchronous belt, an upper seventh section synchronous belt and an upper eighth section synchronous belt connected in sequence end to end; The upper driving wheel is arranged between the fifth section of the upper synchronous belt and the sixth section of the upper synchronous belt; The upper guide wheels include an upper first guide wheel arranged between an upper first section synchronous belt and an upper second section synchronous belt, an upper second guide wheel between an upper second section synchronous belt and an upper third section synchronous belt, an upper third guide wheel between an upper third section synchronous belt and an upper fourth section synchronous belt, an upper fourth guide wheel between an upper fourth section synchronous belt and an upper fifth section synchronous belt, an upper fifth guide wheel between an upper sixth section synchronous belt and an upper seventh section synchronous belt, and an upper sixth guide wheel between an upper seventh section synchronous belt and an upper eighth section synchronous belt.

3. The transmission structure for a 3D printer according to claim 2, characterized in that: The lower synchronous belt mechanism includes a lower synchronous belt, a lower driving wheel and a lower guide wheel; the lower synchronous belt includes a lower first synchronous belt, a lower second synchronous belt, a lower third synchronous belt, a lower fourth synchronous belt, a lower fifth synchronous belt, a lower sixth synchronous belt, a lower seventh synchronous belt and a lower eighth synchronous belt connected in sequence end to end; The lower driving wheel is arranged between the fifth synchronous belt section and the sixth synchronous belt section of the lower layer; The lower guide wheels include a lower first guide wheel arranged between the lower first section synchronous belt and the lower second section synchronous belt, a lower second guide wheel between the lower second section synchronous belt and the lower third section synchronous belt, a lower third guide wheel between the lower third section synchronous belt and the lower fourth section synchronous belt, a lower fourth guide wheel between the lower fourth section synchronous belt and the lower fifth section synchronous belt, a lower fifth guide wheel between the lower sixth section synchronous belt and the lower seventh section synchronous belt, and a lower sixth guide wheel between the lower seventh section synchronous belt and the lower eighth section synchronous belt.

4. The transmission structure for a 3D printer according to claim 3, characterized in that: The upper driving wheel and the lower driving wheel are arranged adjacent to each other and are arranged on one side of one end of the Y-direction slide rail.

5. The transmission structure for a 3D printer according to claim 3, characterized in that: The upper first guide wheel and the upper driving wheel are located outside the loop formed by the upper synchronous belt; The first guide wheel of the lower layer and the fourth guide wheel of the lower layer are located outside the loop formed by the synchronous belt of the lower layer.

6. The transmission structure for a 3D printer according to claim 3, characterized in that: The arrangement direction of the first section of the upper synchronous belt, the eighth section of the upper synchronous belt, the first section of the lower synchronous belt and the eighth section of the lower synchronous belt is consistent with the arrangement direction of the X-direction slide rail; The setting directions of the upper second section synchronous belt, the upper third section synchronous belt, the upper seventh section synchronous belt, the lower second section synchronous belt, the lower third section synchronous belt and the lower seventh section synchronous belt are consistent with the setting direction of the Y-direction slide rail.

7. The transmission structure for a 3D printer according to claim 3, characterized in that: The transmission structure further comprises a connecting device, which is configured to move with the X-direction slide rail and along the Y-direction slide rail under the action of the upper synchronous belt mechanism and the lower synchronous belt mechanism.

8. The transmission structure for a 3D printer according to claim 7, characterized in that: The connecting device includes a slide rail placement portion, a first connecting portion, a second connecting portion and a first supporting portion. The two ends of the slide rail placement portion are provided with a first connecting portion and a first supporting portion. The first connecting portion is connected to the slide rail placement portion and / or the first supporting portion, and the second connecting portion is connected to the first supporting portion. At least one second connecting portion is provided with a baffle.

9. The transmission structure for a 3D printer according to claim 8, characterized in that: The slide rail placement portion is provided with a first placement groove, and the first placement groove is used for placing the X-direction slide rail.

10. The transmission structure for a 3D printer according to claim 8, characterized in that: The upper first guide wheel and the lower sixth guide wheel, as well as the upper sixth guide wheel and the lower first guide wheel are all arranged on the first connecting portion.

11. The transmission structure for a 3D printer according to claim 3, characterized in that: It also includes a tensioning device, on which the upper second guide wheel and the lower second guide wheel are both arranged, and the tensioning device is configured to adjust the positions of the upper second guide wheel and the lower second guide wheel.

12. A 3D printer, characterized in that: It comprises a base plate and a transmission structure as described in any one of claims 1 to 10; the transmission structure comprises an X-axis slide rail, a Y-axis slide rail, a connecting device, an upper synchronous belt mechanism and a lower synchronous belt mechanism, and the Y-axis slide rail is arranged on the base plate; the X-axis slide rail is connected to the connecting device, and moves on the Y-axis slide rail driven by the upper synchronous belt mechanism and the lower synchronous belt mechanism.

13. A 3D printer according to claim 12, characterized in that: The bottom plate is also provided with a feed port for feeding materials toward the nozzle assembly of the 3D printer, and the feed port is arranged on the bottom plate away from the upper driving wheel and the lower driving wheel.

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