Transmission device and 3D printer

Abstract

The utility model relates to a transmission device and a 3D printer, and the transmission device comprises a first transmission belt which extends in the first direction and is provided with a first end and a second end which are located in the first direction, and the relative positions of the first end and the second end of the first transmission belt are fixed; the first tensioning assembly comprises a fixing seat and a pressing block connected to the fixing seat, the fixing seat is fixed to the first transmission belt, and the pressing block is configured to abut against the first transmission belt in the direction forming an included angle with the first direction so as to apply tensioning force to the first transmission belt. The first transmission belt can be effectively tensioned, and the printing precision and the model quality are improved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing, and in particular to a transmission device and a 3D printer. Background Art

[0002] Fused Deposition Modeling (FDM) is a technology that constructs 3D models by depositing molten consumables layer by layer. Therefore, 3D printers based on Fused Deposition Modeling (FDM) technology usually need to be equipped with a transmission member to transmit the power of the drive assembly to the nozzle assembly or the printing platform assembly, so that the nozzle assembly or the printing platform assembly moves to achieve printing. In the related art, a belt is often used as a transmission member to transmit the power of the drive assembly to other components. However, the belt transmission member is easy to loosen, so that the power of the drive assembly cannot be effectively transmitted to other components, resulting in a decrease in the printing accuracy of the 3D printer and affecting the quality of the 3D printed model. Utility Model Content

[0003] An embodiment of the present application provides a transmission device and a 3D printer, which can effectively tension a first transmission belt, thereby improving printing accuracy and model quality.

[0004] A transmission device provided in one embodiment of the present application includes:

[0005] A first transmission belt extending in a first direction, the first transmission belt having a first end and a second end located in the first direction, and the relative positions of the first end and the second end of the first transmission belt are fixed; and

[0006] The first tensioning assembly includes a fixed seat and a pressure block connected to the fixed seat, the fixed seat is fixed to the first transmission belt, and the pressure block is configured to abut against the first transmission belt along a direction having an angle with the first direction to apply tension to the first transmission belt.

[0007] A 3D printer provided in one embodiment of the present application includes the above-mentioned transmission device.

[0008] Compared with the prior art, the beneficial features of the embodiments of the present application are: the transmission device and the 3D printer include a first transmission belt and a first tensioning assembly, the first transmission belt extends along a first direction, the first transmission belt has a first end and a second end located in the first direction, the relative positions of the first end and the second end of the first transmission belt are fixed, the first tensioning assembly includes a fixed seat and a pressure block connected to the fixed seat, the fixed seat is fixed to the first transmission belt, and the pressure block is configured to abut against the first transmission belt along a direction having an angle with the first direction to apply a tensioning force to the first transmission belt, thereby quickly and effectively tensioning the first transmission belt, thereby improving printing accuracy and model quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the transmission structure of an embodiment of the present application;

[0010] Figure 2 for Figure 1 A magnified view of the local A structure;

[0011] Figure 3 for Figure 1 A magnified view of the local B structure;

[0012] Figure 4 for Figure 1 A magnified view of the local C structure;

[0013] Figure 5 for Figure 1 A schematic diagram of a partial structure of a transmission device shown;

[0014] Figure 6 for Figure 5 A magnified view of the local D structure;

[0015] Figure 7 for Figure 1 A schematic diagram of the structure of the first tensioning assembly in the transmission device shown;

[0016] Figure 8 for Figure 1 A schematic diagram of the structure of the second tensioning assembly in the transmission device shown;

[0017] Fig. 9 for Figure 8 A schematic diagram of the structure of the second tensioning assembly shown;

[0018] Fig.10 for Figure 8 A top view of the second tensioning assembly is shown;

[0019] Fig.11 for Fig.10 EE cross-sectional view;

[0020] Fig.12 for Figure 1 A schematic diagram of a partial structure of a transmission device shown;

[0021] Fig.13 for Fig.12 A magnified view of the local F structure;

[0022] Fig.14 for Fig.12 Right view of;

[0023] Fig.15 for Fig.14 A magnified view of the local G structure;

[0024] Wherein: 1-first transmission belt (101-first end, 102-second end, 103-first side, 104-second side), 2-first tensioning assembly (201-fixed seat (2011-assembly groove, 2012-tensioning groove, 2013-installation groove (20131-first surface, 20132-second surface), 2014-assembly hole), 202-pressing block (2021-connecting part (L1-length of connecting part), 2022-pressing part (L2-length of pressing part), 2023-locking hole), 203-rotating shaft), 3-output assembly, 4-first synchronous wheel, 5-second synchronous wheel, 6-first base, 7-second base, 8-connecting rod, 9-driving assembly (901-driving member (9011-output shaft), 902-second transmission belt ( 902a-second transmission belt, 902b-second transmission belt, 9021-first end, 9022-second end, 9023-first side, 9024-second side), 903-driving wheel, 904-driven wheel), 10-support seat (1001-second limiting portion (10011-flange body), 1002-support surface, 1003-third limiting portion), 11-second tensioning assembly (1101-pull block (11011-mounting hole, 11012-first limiting portion, 11013-annular limiting groove, 11014-guide limiting hole), 1102-rotating shaft, 1103-elastic portion (11031-first end, 11032-second end)), 12-first sliding rod, 13-second sliding rod, 14-first clamping wheel, 15-second clamping wheel. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0028] Please refer to Figure 1 , Figure 2 , Figures 5 to 8 and Figure 12 to Figure 13 The transmission device of the embodiment of the present application includes a first transmission belt 1 and a first tensioning assembly 2. The first transmission belt 1 extends along a first direction, and the first transmission belt 1 has a first end 101 and a second end 102 located in the first direction, and the relative positions of the first end 101 and the second end 102 of the first transmission belt 1 are fixed. The first tensioning assembly 2 includes a fixing seat 201 and a pressure block 202. The pressure block 202 is connected to the fixing seat 201. The fixing seat 201 is fixed to the first transmission belt 1, and the pressure block 202 is configured to abut against the first transmission belt 1 along a direction having an angle with the first direction to apply tension to the first transmission belt 1.

[0029] In the embodiment of the present application, the relative positions of the first end 101 and the second end 102 of the first transmission belt 1 are fixed, the fixing seat 201 is fixed to the first transmission belt 1, and the pressing block 202 is configured to abut against the first transmission belt 1 along a direction having an angle with the first direction to apply a tensioning force to the first transmission belt 1, thereby quickly and effectively tensioning the first transmission belt 1, thereby improving the printing accuracy and model quality.

[0030] It can be understood that the pressing block 202 abuts against the first transmission belt 1 along a direction having an angle with the first direction, which means that the direction of the pressure applied by the pressing block 202 to the first transmission belt 1 is not colinear with the first direction in which the first transmission belt 1 extends, so that part of the first transmission belt 1 protrudes toward other directions, please refer to Figure 2 and Figure 6 As shown, the purpose of tensioning the first transmission belt 1 is achieved. As an example, the pressing block 202 can abut against the first transmission belt 1 in a direction perpendicular to the first direction to apply tension to the first transmission belt 1, or the pressing block 202 can also abut against the first transmission belt 1 in other directions, as long as the pressing block 202 abuts against the first transmission belt 1 to achieve the effect of tensioning the first transmission belt.

[0031] Please refer to Figure 7 As shown, the fixing seat 201 may be provided with an assembly slot 2011 and a tensioning slot 2012, wherein the assembly slot 2011 penetrates the fixing seat 201 along the first direction, the tensioning slot 2012 is an arc-shaped slot, and the tensioning slot 2012 is connected to the assembly slot 2011. The first transmission belt 1 is passed through the assembly slot 2011, and the pressing block 202 is configured to press the first transmission belt 1 passed through the assembly slot 2011 into the tensioning slot 2012, so as to fix the first tensioning assembly 2 to the first transmission belt 1 and tension the first transmission belt 1. In other words, the pressing block 202 cooperates with the fixing seat 201 to not only tension the first transmission belt 1, but also fix the first tensioning assembly 2 to the first transmission belt 1, which has a simple structure, is convenient to use, and is easy to install.

[0032] As an example, please refer to Fig.12 and Fig.13 , the first transmission belt 1 can be a closed belt. The first transmission belt 1 has a first side 103 located in the positive direction of the second direction and a second side 104 located in the opposite direction of the second direction, and the first tensioning assembly 2 is fixed to the first side 103 of the first transmission belt 1. It can be understood that during the rotation of the first transmission belt 1, the first side 103 of the first transmission belt 1 and the second side 104 of the first transmission belt 1 move in opposite directions. In other words, during the rotation of the first transmission belt 1, the first tensioning assembly 2 moves with the first side 103 of the first transmission belt 1.

[0033] It is understandable that in other embodiments, the first tensioning assembly 2 may also be tensioned and fixed to the second side 104 of the first transmission belt 1 , which will not be described in detail herein.

[0034] Please refer to Figure 7 As shown, the first tensioning assembly 2 may further include a rotating shaft 203 and a fastener (not shown). The pressing block 202 is rotatably connected to the fixing seat 201 via the rotating shaft 203. The fastener is threadedly connected to the fixing seat 201, and the fastener is configured to fix the pressing block 202 to the fixing seat 201, thereby preventing the pressing block 202 from rotating relative to the fixing seat 201, and allowing the pressing block 202 to cooperate with the fixing seat 201 to clamp the first transmission belt 1. When the fastener does not fix the pressing block 202 to the fixing seat 201, the pressing block 202 may move relative to the fixing seat 201. For example, the pressing block 202 may be detachably connected to the fixing seat 201, the rotating shaft 203 may be fixed to the fixing seat 201, the pressing block 202 may be removed from the rotating shaft 203, and the pressing block 202 may also rotate around the rotating shaft 203; or, the pressing block 202 and the fixing seat 201 may not be detachable, but the pressing block 202 may rotate relative to the fixing seat 201 around the rotating shaft 203. The rotating shaft 203 and the fastener are provided, which not only facilitates the pre-installation of the fixing seat 201 on the first transmission belt 1, but also allows the fixing seat 201 to be fixed to the first transmission belt 1 by screwing the fastener so that the fastener can fix the pressing block 202 and the fixing seat 201, thereby not only tensioning the first transmission belt 1 but also fixing the first tensioning assembly 2 to the first transmission belt 1, which has a simple structure, is easy to use and is convenient to install.

[0035] In some embodiments, the rotating shaft 203 may be eccentrically arranged relative to the tensioning groove 2012, and the fastener may extend in the first direction. As an example, the fastener may press the pressing block 202 against the fixing seat 201 in the first direction. It is understandable that, when the fastener does not press the pressing block 202 against the fixing seat 201, the pressing block 202 may rotate relative to the fixing seat 201 around the rotating shaft 203, so as to facilitate the pre-installation of the fixing seat 201 on the first transmission belt 1. After the fixing seat 201 is installed on the first transmission belt 1, the fastener may be screwed to gradually press the pressing block 202 against the fixing seat 201. In this process, the pressing block 202 may rotate relative to the fixing seat 201 around the rotating shaft 203, and the distance between the surface of the pressing block 202 abutting against the first transmission belt 1 and the groove wall of the tensioning groove 2012 becomes smaller and smaller, thereby gradually pressing the first transmission belt 1. When the fastener cannot continue to feed, it means that the pressing block 202 has been completely pressed against the fixing seat 201, and the pressing block 202 can no longer rotate relative to the fixing seat 201. At this time, the pressing block 202 also presses the first transmission belt 1 into the tensioning groove 2012, which can not only tension the first transmission belt 1, but also fix the first tensioning assembly 2 to the first transmission belt 1. It has a simple structure, is easy to use, and is easy to install.

[0036] The pressing block 202 may include a connecting portion 2021 and a pressing portion 2022. Figure 2 ,and Figures 6 to 8 . The clamping portion 2022 extends from the connecting portion 2021, and the clamping portion 2022 and the connecting portion 2021 are set at an angle, and the rotating shaft 203 is connected to the connection between the connecting portion 2021 and the clamping portion 2022. The fastener is configured to press the connecting portion 2021 against the fixing seat 201. When the fastener presses the connecting portion 2021 against the fixing seat 201, the clamping portion 2022 is configured to press the first transmission belt 1 inserted into the assembly groove 2011 into the tensioning groove 2012. The structure is simple and easy to assemble. Not only does it have a good tensioning effect, but it can also firmly fix the first tensioning assembly 2 to the first transmission belt 1, so that the first tensioning assembly 2 can move synchronously with the first transmission belt 1, thereby avoiding damage to the first transmission belt 1 caused by the relative movement of the first tensioning assembly 2 and the first transmission belt 1.

[0037] As an example, there may be an obtuse angle between the pressing portion 2022 and the connecting portion 2021 .

[0038] Please refer to Figure 7In some examples, the fixing seat 201 may be provided with a mounting groove 2013. The mounting groove 2013 and the tensioning groove 2012 are respectively provided on the opposite sides of the assembly groove 2011. The mounting groove 2013, the tensioning groove 2012 and the assembly groove 2011 jointly limit the installation space for installing the pressing block 202. The mounting groove 2013 has a first surface 20131 and a second surface 20132 which are arranged opposite to each other. The fixing seat 201 may be provided with an assembly hole 2014 which is threadedly matched with a fastener. The assembly hole 2014 extends along a first direction and passes through the first surface 20131 of the mounting groove 2013. The fastener threadedly connected to the assembly hole 2014 may be fed along the first direction to press the connecting portion 2021 against the second surface 20132 of the mounting groove 2013. When the first tensioning assembly 2 needs to be disassembled, the fastener can be screwed out along the first direction so that the connecting portion 2021 is no longer pressed against the second surface 20132 of the mounting groove 2013, which is convenient to use and easy to load and unload.

[0039] Please refer to Figure 7 The above-mentioned pressing block 202 may also be provided with a locking hole 2023 that cooperates with the fastener. The locking hole 2023 may be a blind hole and the locking hole 2023 may be a light hole. The fastener may be fed along the first direction to be inserted into the locking hole 2023 and pressed against the bottom of the locking hole 2023. This not only avoids the fastener from abutting against the appearance surface of the pressing block 202 to damage the appearance surface of the pressing block 202, but also improves the matching accuracy of the pressing block 202 and the fastener.

[0040] In some embodiments, the diameter of the locking hole 2023 may be larger than the diameter of the assembly hole 2014 , thereby facilitating the insertion of the fastener into the locking hole 2023 and avoiding interference between the hole wall of the locking hole 2023 and the fastener, thereby preventing the fastener from pressing the pressing block 202 onto the fixing seat 201 .

[0041] Please refer to Figure 7 , the length L1 of the connection portion 2021 can be greater than the length L2 of the pressing portion 2022, so that the pressing portion 2022 can more effectively press the first transmission belt 1 passing through the assembly groove 2011 into the tensioning groove 2012 by utilizing the lever principle. It is understandable that in other embodiments, the length L1 of the connection portion 2021 can also be not greater than the length L2 of the pressing portion 2022, and can be set as needed, which will not be described in detail here. It is understandable that in other embodiments, the pressing block 202 can be connected and fixed to the fixing seat 201 in other ways, as long as the pressing block 202 abuts against the first transmission belt 1 to achieve the effect of tensioning the first transmission belt 1.

[0042] Please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6The transmission device may further include an output assembly 3, which is fixed to the first tensioning assembly 2, so as to avoid the first tensioning assembly 2 interfering with the movement of the output assembly 3, and the layout is more reasonable.

[0043] As an example, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 The output component 3 can be fixed to the first transmission belt 1 through the first tensioning component 2. That is to say, the first tensioning component 2 can not only effectively tension the first transmission belt 1, thereby improving the printing accuracy and the model quality, but also effectively fix the output component 3 to the first transmission belt 1, so that the first transmission belt 1 can drive the output component 3 to move. The structure is simple, easy to assemble, and easy to use. It can also avoid the first tensioning component 2 interfering with the movement of the output component 3, and the layout is more reasonable.

[0044] In some examples, during assembly, the fixing seat 201 can be first fixed to the output component 3, and then the first transmission belt 1 can be fixed to the fixing seat 201 through the pressing block 202. The pressing block 202 with an eccentric angle can tighten the first transmission belt 1 that is too long, thereby improving the transmission accuracy of the first transmission belt 1.

[0045] It is understandable that in other embodiments, the output assembly 3 can be directly fixed to the first transmission belt 1, as long as it is ensured that the first tensioning assembly 2 does not interfere with the movement of the output assembly 3, which will not be elaborated here.

[0046] Please refer to Figures 12 to 15 The transmission device may further include a first synchronous wheel 4 and a second synchronous wheel 5, wherein the first synchronous wheel 4 is transmission-connected to the first end 101 of the first transmission belt 1, and the second synchronous wheel 5 is transmission-connected to the second end 102 of the first transmission belt 1, and the relative positions of the first synchronous wheel 4 and the second synchronous wheel 5 are fixed. The first synchronous wheel 4 and the second synchronous wheel 5 may be used to limit the first end 101 and the second end 102 of the first transmission belt 1, thereby effectively ensuring that the relative positions of the first end 101 and the second end 102 of the first transmission belt 1 are fixed.

[0047] As an example, at least one of the first synchronous wheel 4 and the second synchronous wheel 5 can be used to drive the first transmission belt 1 to move.

[0048] In some embodiments, please refer to Figure 1 and Fig.12 The first synchronous wheel 4 and the second synchronous wheel 5 are respectively used to drive the first transmission belt 1 to move. As an example, the first synchronous wheel 4 and the second synchronous wheel 5 can rotate synchronously, and the first transmission belt 1 rotates synchronously with the first synchronous wheel 4 and the second synchronous wheel 5, thereby driving the output assembly 3 to move forward in the first direction or reverse in the first direction.

[0049] In other embodiments, only one of the first synchronous wheel 4 and the second synchronous wheel 5 is used to drive the first transmission belt 1 to move. As an example, in the case where only the first synchronous wheel 4 drives the first transmission belt 1 to move, the first synchronous wheel 4 rotates, thereby driving the first transmission belt 1 to rotate along with the first synchronous wheel 4, and then the first transmission belt 1 drives the output assembly 3 to move. Alternatively, in the case where only the second synchronous wheel 5 drives the first transmission belt 1 to move, the second synchronous wheel 5 rotates, thereby driving the first transmission belt 1 to rotate along with the second synchronous wheel 5, and then the first transmission belt 1 drives the output assembly 3 to move.

[0050] Please refer to Figure 1 and Figure 5 The transmission device may further include a first base 6, a second base 7 and a connecting rod 8. The connecting rod 8 extends along the first direction, and is configured to be fixedly connected to the first base 6 and the second base 7, so that the relative positions of the first base 6 and the second base 7 are fixed. The first synchronous wheel 4 is rotatably connected to the first base 6, the second synchronous wheel 5 is rotatably connected to the second base 7, and the output assembly 3 is slidably connected to the connecting rod 8, thereby effectively ensuring that the relative positions of the first synchronous wheel 4 and the second synchronous wheel 5 are fixed, and the connecting rod 8 can support the output assembly 3, so that the output assembly 3 can move more stably along the first direction, further improving the printing accuracy and model quality.

[0051] As an example, please refer to Figure 1 , Fig.12 and Fig.13 In the case where the first synchronous wheel 4 and the second synchronous wheel 5 are respectively used to drive the first transmission belt 1 to move, the transmission device may further include two driving assemblies 9. One of the driving assemblies 9 is configured to drive the first synchronous wheel 4 to move, and the other driving assembly 9 is configured to drive the second synchronous wheel 5 to move. By controlling the movement of the first synchronous wheel 4 and the second synchronous wheel 5, the first transmission belt 1 is driven to move, and the transmission accuracy of the first transmission belt 1 can be further improved.

[0052] Please refer to Figure 1The transmission device may further include a support seat 10 and two second tensioning assemblies 11. The two second tensioning assemblies 11 may be arranged in a one-to-one correspondence with the two driving assemblies 9. Each driving assembly 9 includes a driving member 901 and a second transmission belt 902. The driving member 901 is fixed to the support seat 10. The second transmission belt 902 extends along the second direction, and the second transmission belt 902 has a first end 9021 and a second end 9022 located in the second direction. The first end 9021 of the second transmission belt 902 is transmission-connected to the driving member 901, and the second end 9022 of the second transmission belt 902 is rotatably connected to the second tensioning assembly 11. In this embodiment, the second transmission belt 902 in each driving assembly 9 can be kept in a tensioned state, further improving the transmission accuracy of the transmission device.

[0053] Please refer to Figure 3 , Figure 4 ,and Figures 8 to 11 Each second tensioning assembly 11 may include a pulling block 1101, a rotating shaft 1102, and an elastic portion 1103. The pulling block 1101 is rotatably connected to the support seat 10 via the rotating shaft 1102, and the second end 9022 of the second transmission belt 902 is rotatably connected to the pulling block 1101. The elastic portion 1103 is located between the second transmission belt 902 and the rotating shaft 1102, and the elastic portion 1103 is compressed between the support seat 10 and the pulling block 1101 along the second direction. The elastic portion 1103 has a first end 11031 and a second end 11032 along the second direction, the first end 11031 of the elastic portion 1103 abuts against the support seat 10, and the second end 11032 of the elastic portion 1103 abuts against the pulling block 1101, and the compressed elastic portion 1103 can apply a positive thrust along the second direction to the pulling block 1101. Therefore, under the action of the elastic part 1103, the pull block 1101 can apply a positive pulling force along the second direction to the second transmission belt 902. When the second transmission belt 902 is loose, the elastic part 1103 can push the pull block 1101 to rotate in a direction close to the positive direction of the second direction with the rotating shaft 1102 as the center, so that the pull block 1101 tightens the second transmission belt 902, thereby tensioning the second transmission belt 902. The second tensioning component 11 can adaptively tension the second transmission belt 902 based on the state of the second transmission belt 902, which is easy to use and can keep the second transmission belt 902 in a tensioned state, thereby ensuring the transmission accuracy of the second transmission belt 902, further ensuring the movement accuracy of the first transmission belt 1, thereby ensuring the movement accuracy of the output component 3, and further improving the printing accuracy and model quality.

[0054] As an example, please refer to Figure 3 , Figure 4 , Figure 8 and Fig. 9, the elastic part 1103 may be a spring. It is understandable that in other embodiments, the elastic part 1103 may also be other elastic structures, as long as the second tensioning assembly 11 can tension the second transmission belt 902, which will not be described in detail here.

[0055] Optionally, refer to Fig. 9 and Fig.11 The pull block 1101 may be provided with a mounting hole 11011 cooperating with the elastic portion 1103 . The mounting hole 11011 may be a blind hole, thereby restricting the second end 11032 of the elastic portion 1103 within the mounting hole 11011 .

[0056] Please refer to Fig.11 The pull block 1101 may also have a first limiting portion 11012, which may be formed in the mounting hole 11011 and protrude from the hole wall of the mounting hole 11011 along the second direction, and the surface of the first limiting portion 11012 and the hole wall of the mounting hole 11011 jointly limit an annular limiting groove 11013. The second end 11032 of the elastic portion 1103 may abut against the annular limiting groove 11013, thereby more effectively limiting the elastic portion 1103, preventing the elastic portion 1103 from coming out of the mounting hole 11011, and further improving the assembly accuracy.

[0057] Please refer to Figure 3 , Figure 4 , Figure 8 , Fig. 9 and Fig.11 The above-mentioned pull block 1101 may be provided with a guide limit hole 11014, and a second limit portion 1001 is fixed on the support seat 10. The second limit portion 1001 is slidably connected to the guide limit hole 11014, and the second limit portion 1001 cooperates with the guide limit hole 11014 to limit the rotation angle of the pull block 1101. When the pull block 1101 rotates toward the positive direction of the second direction with the rotating shaft 1102 as the center, the second limit portion 1001 can slide in the guide limit hole 11014 relative to the pull block 1101, and the second limit portion 1001 can be used to limit the extreme position of the pull block 1101 in the second direction, thereby avoiding the second transmission belt 902 being over-tensioned, which affects the performance and life of the second transmission belt 902, and further improves the service life of the second transmission belt 902 and the transmission accuracy of the second transmission belt 902.

[0058] As an example, please refer to Figure 3 , Figure 4 , Figure 8 , Fig. 9 and Fig.11 The guide limit hole 11014 can be an oblong hole centered on the center of the rotating shaft 1102, so as to avoid interference with the pull block 1101 rotating around the rotating shaft 1102.

[0059] As an example, the second limiting portion 1001 may include a column (not shown) fixed to the support base 10 and extending along the third direction, the column slidably connected to the guide limiting hole 11014, wherein the first direction, the second direction and the third direction are perpendicular to each other. Figure 3 and Figure 4 The second limiting portion 1001 may further include a flange body 10011 fixed to the column and extending along a third direction. The flange body 10011 may limit the column in the guide limiting hole 11014 to prevent the column from escaping from the guide limiting hole 11014 along the third direction, thereby improving the assembly accuracy and stability of the printer.

[0060] Please refer to Figure 3 and Figure 4 The support seat 10 may have a support surface 1002 that abuts against the elastic portion 1103. The support seat 10 may also have a third limiting portion 1003. The third limiting portion 1003 is protruded from the edge of the support surface 1002, which is not only more convenient for precise assembly, but also can more effectively limit the elastic portion 1103, thereby preventing the elastic portion 1103 from moving relative to the support seat 10 and separating from the support surface 1002.

[0061] Please refer to Fig.12 , at least one of the first transmission belt 1 and the two second transmission belts 902 is a closed-loop belt.

[0062] It is understandable that the first transmission belt 1 and the two second transmission belts 902 may all be closed-loop belts. Alternatively, the first transmission belt 1 and any two of the two second transmission belts 902 may be closed-loop belts. Alternatively, the first transmission belt 1 and any one of the two second transmission belts 902 may be closed-loop belts.

[0063] In some embodiments, please refer to Fig.12 , the first transmission belt 1 can be a closed-loop belt. Both second transmission belts 902 can be closed-loop belts. In this embodiment, the first transmission belt 1 and the two second transmission belts 902 are respectively configured as closed-loop belts, so that the first transmission belt 1 and the two second transmission belts 902 are less likely to loosen, further improving the service life and transmission accuracy of the first transmission belt 1 and the two second transmission belts 902, thereby improving the motion accuracy of the output component 3.

[0064] Please refer to Fig.12 The above-mentioned closed-loop belt refers to a belt with a closed loop structure.

[0065] Please refer to Fig.12Each driving assembly 9 may further include a driving wheel 903 and a driven wheel 904, wherein the driving wheel 903 is configured to be transmission-connected to the driving member 901 and the second transmission belt 902, and the driving wheel 903 may be fixed to the output shaft 9011 of the driving member 901, thereby effectively transmitting the power of the driving member 901 to the second transmission belt 902. The driven wheel 904 is transmission-connected to the second end 9022 of the second transmission belt 902 and is rotatably connected to the support seat 10.

[0066] In some embodiments, please refer to Fig.12 , the second transmission belt 902a of one driving assembly 9 is connected to the first synchronous wheel 4, and the second transmission belt 902b of the other driving assembly 9 is connected to the second synchronous wheel 5. The first transmission belt 1 can be configured as follows: when the second transmission belt 902a and the second transmission belt 902b rotate in the same direction, the first transmission belt 1 drives the output assembly 3 to move in the first direction; when the second transmission belt 902a and the second transmission belt 902b rotate in the opposite direction, the first transmission belt 1 drives the output assembly 3 to move in the second direction. In this embodiment, not only can the output assembly 3 be effectively driven to move in the first direction and the second direction, but also, three transmission belts are set to transmit power, thereby driving the output assembly 3 to move, and the length of a single transmission belt can be shortened, that is, the length of the first transmission belt 1, the second transmission belt 902a and the second transmission belt 902b can be shortened, thereby improving the problem of the transmission belt loosening after long-term use, improving the movement accuracy of the output assembly 3, and thus improving the printing accuracy and model quality.

[0067] In some embodiments, please refer to Figure 1 The output component 3 may be a nozzle component. The first direction may be an X direction, and the second direction may be a Z direction.

[0068] In other embodiments, the output component 3 may be a printing platform component. The first direction may be the Y direction, and the second direction may be the X direction. Alternatively, the output component may be other components, which will not be described in detail herein.

[0069] In some examples, the structures of the second transmission belt 902a and the second transmission belt 902b may be the same, and the rotation speeds of the second transmission belt 902a and the second transmission belt 902b may be the same, so that both ends of the first transmission belt 1 can be balanced, further improving the printing accuracy.

[0070] In some embodiments, please refer to Fig.12 and Fig.13, the first synchronous wheel 4 is meshed with the first end 101 of the first transmission belt 1, and the second synchronous wheel 5 is meshed with the second end 102 of the first transmission belt 1. The two second transmission belts 902 respectively have a first side 9023 and a second side 9024 that are arranged opposite to each other. Among them, the side where the two second transmission belts 902 are far away from each other is the first side 9023 of the second transmission belt 902, and the side where the two second transmission belts 902 are close to each other is the second side 9024 of the second transmission belt 902. The first synchronous wheel 4 is meshed with the first side 9023 of the second transmission belt 902a. The second synchronous wheel 5 is meshed with the first side 9023 of the second transmission belt 902b. The second transmission belt 902a and the second transmission belt 902b not only have the same structure, but also the second transmission belt 902a and the second transmission belt 902b are symmetrically arranged, which further improves the motion accuracy of the first transmission belt 1.

[0071] In this embodiment, please refer to Fig.12 When the second transmission belt 902a rotates in the clockwise direction S and the second transmission belt 902b also rotates in the clockwise direction S, the first synchronous wheel 4 rotates along with the second transmission belt 902a in the clockwise direction S, and the second synchronous wheel 5 rotates along with the second transmission belt 902b in the clockwise direction S, thereby driving the first transmission belt 1 to rotate in the clockwise direction S. At this time, the first side 103 of the first transmission belt 1 moves forward in the first direction, and the second side 104 of the first transmission belt 1 moves in the reverse direction in the first direction. Therefore, the output component 3 fixed to the first side 103 of the first transmission belt 1 also moves forward in the first direction.

[0072] In this embodiment, please refer to Fig.12 When the second transmission belt 902a rotates counterclockwise N, and at the same time, the second transmission belt 902b also rotates counterclockwise N, the first synchronous wheel 4 rotates counterclockwise N with the second transmission belt 902a, and the second synchronous wheel 5 rotates counterclockwise N with the second transmission belt 902b, thereby driving the first transmission belt 1 to rotate counterclockwise N. At this time, the first side 103 of the first transmission belt 1 moves in the opposite direction of the first direction, and the second side 104 of the first transmission belt 1 moves in the forward direction of the first direction. Therefore, the output component 3 fixed to the first side 103 of the first transmission belt 1 also moves in the opposite direction of the first direction.

[0073] In this embodiment, please refer to Fig.12, when the second transmission belt 902a rotates in the clockwise direction S and the second transmission belt 902b rotates in the counterclockwise direction N, the second transmission belt 902a transmits the power rotating in the clockwise direction S to the first synchronous wheel 4, and the second transmission belt 902b transmits the power rotating in the counterclockwise direction N to the second synchronous wheel 5. Since the first synchronous wheel 4 and the second synchronous wheel 5 are simultaneously engaged with the first transmission belt 1, the first synchronous wheel 4 and the second synchronous wheel 5 cannot rotate in opposite directions, so the first synchronous wheel 4, the second synchronous wheel 5 and the first transmission belt 1 do not rotate. Since the first synchronous wheel 4 is engaged with the first side 9023 of the second transmission belt 902a, the first side 9023 of the second transmission belt 902a moves forward in the second direction at this time, and the non-rotating first synchronous wheel 4 follows the first side 9023 of the second transmission belt 902a and moves forward in the second direction. Similarly, since the second synchronous wheel 5 is engaged with the first side 9023 of the second transmission belt 902b, the first side 9023 of the second transmission belt 902b moves positively in the second direction, the non-rotating second synchronous wheel 5 follows the first side 9023 of the second transmission belt 902b and moves positively in the second direction, and the first transmission belt 1 moves positively in the second direction along with the first synchronous wheel 4 and the second synchronous wheel 5. Therefore, the output component 3 fixed to the first side 103 of the first transmission belt 1 also moves positively in the second direction.

[0074] In this embodiment, please refer to Fig.12 , when the second transmission belt 902a rotates counterclockwise N, and at the same time, the second transmission belt 902b rotates clockwise S, the second transmission belt 902a transmits the power rotating in the counterclockwise N to the first synchronous wheel 4, and the second transmission belt 902b transmits the power rotating in the clockwise S to the second synchronous wheel 5. Since the first synchronous wheel 4 and the second synchronous wheel 5 are simultaneously engaged with the first transmission belt 1, the first synchronous wheel 4 and the second synchronous wheel 5 cannot rotate in opposite directions, so the first synchronous wheel 4, the second synchronous wheel 5 and the first transmission belt 1 do not rotate. Since the first synchronous wheel 4 is engaged with the first side 9023 of the second transmission belt 902a, at this time, the first side 9023 of the second transmission belt 902a moves in the opposite direction in the second direction, and the non-rotating first synchronous wheel 4 follows the first side 9023 of the second transmission belt 902a and moves in the opposite direction in the second direction. Similarly, since the second synchronous wheel 5 is engaged with the first side 9023 of the second transmission belt 902b, the first side 9023 of the second transmission belt 902b moves in the opposite direction along the second direction, and the non-rotating second synchronous wheel 5 follows the first side 9023 of the second transmission belt 902b to move in the opposite direction along the second direction, and the first transmission belt 1 moves in the opposite direction along with the first synchronous wheel 4 and the second synchronous wheel 5. Therefore, the output component 3 fixed to the first side 103 of the first transmission belt 1 also moves in the opposite direction along the second direction.

[0075] It can be understood that, in other embodiments, the first synchronous wheel 4 can be engaged with the second side 9024 of the second transmission belt 902a, and the second synchronous wheel 5 can be engaged with the second side 9024 of the second transmission belt 902b.

[0076] Please refer to Figure 1 The transmission device may further include a first slide bar 12 and a second slide bar 13, and the first slide bar 12 and the second slide bar 13 extend in the second direction respectively. The first slide bar 12 and the second slide bar 13 are relatively fixed. As an example, the first slide bar 12 and the second slide bar 13 may be fixed to the support seat 10 respectively. The first base 6 is slidably connected to the first slide bar 12, and the second base 7 is slidably connected to the second slide bar 13. The first synchronous wheel 4 is rotationally connected to the first base 6, and the second synchronous wheel 5 is rotationally connected to the second base 7. The relative fixing of the first slide bar 12 and the second slide bar 13 can effectively limit the distance between the first synchronous wheel 4 and the second synchronous wheel 5, and can effectively limit the moving trajectory of the first synchronous wheel 4 and the second synchronous wheel 5, thereby further improving the motion accuracy of the output component 3.

[0077] Please refer to Fig.12 and Fig.13 The transmission device may further include a first pressing wheel 14 rotatably connected to the first base 6, and a second pressing wheel 15 rotatably connected to the second base 7. The first pressing wheel 14 may press the second transmission belt 902a against the first synchronous wheel 4, so that the second transmission belt 902a and the first synchronous wheel 4 can maintain effective meshing, thereby further improving the motion accuracy of the output assembly 3. The second pressing wheel 15 may press the second transmission belt 902b against the second synchronous wheel 5, so that the second transmission belt 902b and the second synchronous wheel 5 can maintain effective meshing, thereby further improving the motion accuracy of the output assembly 3.

[0078] Please refer to Fig.12 and Fig.13 The first base 6 may be provided with two first clamping wheels 14, which are spaced apart along the second direction and are symmetrically arranged about the first synchronous wheel 4, so as to more effectively clamp the second transmission belt 902a against the first synchronous wheel 4, further improving the motion accuracy. Similarly, the second base 7 may be provided with two second clamping wheels 15, which are spaced apart along the second direction and are symmetrically arranged about the second synchronous wheel 5, so as to more effectively clamp the second transmission belt 902b against the second synchronous wheel 5, further improving the motion accuracy.

[0079] In this embodiment, please refer to Fig.12 and Fig.13As shown, the first pinch wheel 14 can pinch the first side 9023 of the second transmission belt 902a against the first synchronous wheel 4, so that the second transmission belt 902a and the first synchronous wheel 4 can maintain effective meshing. The second pinch wheel 15 can pinch the first side 9023 of the second transmission belt 902b against the second synchronous wheel 5, so that the second transmission belt 902b and the second synchronous wheel 5 can maintain effective meshing. The first pinch wheel 14 and the second pinch wheel 15 can further improve the motion accuracy of the output assembly 3.

[0080] It is understandable that, in other embodiments, the first synchronous wheel 4 may be engaged with the second side 9024 of the second transmission belt 902a, and the first pressing wheel 14 may press the second side 9024 of the second transmission belt 902a against the first synchronous wheel 4. The second synchronous wheel 5 may be engaged with the second side 9024 of the second transmission belt 902b, and the second pressing wheel 15 may press the second side 9024 of the second transmission belt 902b against the second synchronous wheel 5.

[0081] The embodiments of the present application include any one of the transmission devices described above.

[0082] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above embodiments only express the preferred implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A transmission device, characterized in that: include: A first transmission belt extending along a first direction, the first transmission belt having a first end and a second end located in the first direction, and the relative positions of the first end and the second end of the first transmission belt are fixed; and The first tensioning assembly includes a fixed seat and a pressure block connected to the fixed seat, the fixed seat is fixed to the first transmission belt, and the pressure block is configured to abut against the first transmission belt along a direction having an angle with the first direction to apply tension to the first transmission belt.

2. The transmission device according to claim 1, characterized in that: The fixing seat is provided with an assembly groove and a tensioning groove, the assembly groove penetrates the fixing seat along the first direction, and the tensioning groove is an arc-shaped groove and communicates with the assembly groove; The first transmission belt is inserted into the assembly groove; The pressing block is configured to press the first transmission belt passing through the assembly groove into the tensioning groove, so as to fix the first tensioning assembly to the first transmission belt and tension the first transmission belt.

3. The transmission device according to claim 2, characterized in that: The first tensioning assembly also includes a rotating shaft and a fastener; The rotating shaft is eccentrically arranged relative to the tensioning groove, and the pressing block is rotatably connected to the fixing seat via the rotating shaft; The fastener is threadedly connected to the fixing seat, and the fastener is configured to fix the pressing block to the fixing seat.

4. The transmission device according to claim 3, characterized in that: The pressing block comprises a connecting portion and a pressing portion extending from the connecting portion, the pressing portion and the connecting portion are arranged at an angle, and the rotating shaft is connected to the connection between the connecting portion and the pressing portion; The fastener is configured to press the connecting portion against the fixing seat; In the case where the fastener presses the connecting portion against the fixing seat, the pressing portion is configured to press the first transmission belt passing through the assembly groove into the tensioning groove.

5. The transmission device according to claim 1, characterized in that: The transmission device further includes an output assembly, and the output assembly is fixed to the first tensioning assembly.

6. The transmission device according to claim 1, characterized in that: The transmission device also includes a first synchronous wheel and a second synchronous wheel, the first synchronous wheel is transmission-connected to the first end of the first transmission belt, the second synchronous wheel is transmission-connected to the second end of the first transmission belt, and the relative position of the second synchronous wheel and the first synchronous wheel is fixed.

7. The transmission device according to claim 6, characterized in that: The transmission device also includes a support seat, two drive assemblies and a second tensioning assembly arranged in one-to-one correspondence with the drive assemblies; One of the driving assemblies is configured to drive the first synchronous wheel to move, and the other driving assembly is configured to drive the second synchronous wheel to move; Each of the driving assemblies comprises a driving member and a second transmission belt, wherein the driving member is fixed to the support seat, the second transmission belt extends along a second direction perpendicular to the first direction, the second transmission belt has a first end and a second end located in the second direction, and the first end of the second transmission belt is transmission-connected to the driving member; Each of the second tensioning assemblies includes a pulling block, a rotating shaft and an elastic portion, wherein the pulling block is rotatably connected to the support seat via the rotating shaft, the second end of the second transmission belt is rotatably connected to the pulling block, the elastic portion is located between the second transmission belt and the rotating shaft, and the elastic portion is compressed between the support seat and the pulling block along the second direction to tension the second transmission belt.

8. The transmission device according to claim 7, characterized in that: The pulling block is provided with a guide limiting hole, and a first limiting portion slidably connected to the guide limiting hole is fixed on the supporting seat, and the first limiting portion cooperates with the guide limiting hole to limit the rotation angle of the pulling block.

9. The transmission device according to claim 7, characterized in that: At least one of the first transmission belt and the two second transmission belts is a closed-loop belt.

10. The transmission device according to claim 7, characterized in that: Each of the driving assemblies further comprises a driving wheel and a driven wheel, wherein the driving wheel is configured to be drivingly connected to the driving member and the second transmission belt, and the driven wheel is drivingly connected to the second end of the second transmission belt and rotatably connected to the support seat.

11. A 3D printer, characterized in that: Comprising a transmission device as claimed in any one of claims 1 to 10.

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