Synchronous belt tensioning apparatus for 3D printer, 3D printer, and 3D printing system

Abstract

The present application provides a synchronous belt tensioning apparatus for a 3D printer, a 3D printer, and a 3D printing system. The 3D printer comprises a support, the support being provided with a first accommodating recess and a second accommodating recess, wherein the first accommodating recess is separated from the second accommodating recess, and one end of a synchronous belt is fixed to the first accommodating recess. The synchronous belt tensioning apparatus comprises: a tensioning block, the tensioning block being located in the second accommodating recess, the tensioning block being fixedly connected to the other end of the synchronous belt, and the tensioning block being provided with a fastening hole; an adjusting hole, the adjusting hole being located in the support and arranged corresponding to the fastening hole of the tensioning block; and a fastening member, the fastening member being connected to the fastening hole of the tensioning block within an adjustment range of the adjusting hole, so as to fixedly connect the tensioning block to the support. Compared with the method in which a synchronous belt is tensioned by means of a tensioning pulley, the method in embodiments of the present application can reduce the space required for tensioning the synchronous belt, and achieves good compactness.

Description

Synchronous belt tensioning device for 3D printer, 3D printer and 3D printing system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 28, 2023, with application number 202322328131.X and application name “Timing belt tensioning device for 3D printer, 3D printer and 3D printing system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of 3D printing, and in particular to a synchronous belt tensioning device for a 3D printer, a 3D printer, and a 3D printing system. Background Art

[0003] During 3D printing, a motor is required to drag a slider through a timing belt to achieve printing in all directions. Due to the flexibility of the timing belt, it may become loose after a certain period of use, thus affecting the movement of the slider.

[0004] In order to solve the problem of loose synchronous belt, the synchronous belt can be tightened by installing a tensioning pulley, as shown in Figure 1: By adjusting the position of the tensioning pulley, the synchronous belt can be tightened.

[0005] Although this method can achieve the tensioning of the synchronous belt, it requires reserving a certain amount of space for the tensioning wheel, which will increase the space occupied by the tensioning of the synchronous belt.

[0006] Summary of the Invention

[0007] The present application provides a synchronous belt tensioning device for a 3D printer, a 3D printer, and a 3D printing system, which can reduce the space required for synchronous belt tensioning and have good compactness.

[0008] In a first aspect, an embodiment of the present application provides a timing belt tensioning device for a 3D printer, the 3D printer comprising a bracket, the bracket being provided with a first receiving slot and a second receiving slot; wherein the first receiving slot is separate from the second receiving slot, and the first receiving slot fixes one end of the timing belt;

[0009] The synchronous belt tensioning device comprises:

[0010] A tensioning block, the tensioning block is located in the second receiving groove, the tensioning block is fixedly connected to the other end of the synchronous belt; and the tensioning block is provided with a fixing hole;

[0011] An adjustment hole, the adjustment hole being located on the bracket and corresponding to the fixing hole of the tensioning block;

[0012] A fixing member is connected to the fixing hole of the tensioning block within the adjustment range of the adjustment hole to fix the tensioning block to the bracket.

[0013] In an embodiment of the present application, two separate first and second receiving slots are provided on the bracket. One end of the synchronous belt is fixed in the first receiving slot, and the other end of the synchronous belt is fixed to a tensioning block located in the second receiving slot. The synchronous belt is tensioned by changing the position of the tensioning block relative to the bracket. By implementing this embodiment of the present application, the space within the bracket can be utilized to tension the synchronous belt. Compared to tensioning the synchronous belt using a tensioning pulley, this embodiment can reduce the space required for tensioning the synchronous belt, resulting in improved compactness.

[0014] In combination with the first aspect, in a first possible implementation, the bracket includes a synchronous belt fixing cover plate, the synchronous belt fixing cover plate is provided with the first accommodating groove; the synchronous belt tensioning device further includes a first synchronous belt mounting block;

[0015] The first receiving groove fixes one end of the synchronous belt, and includes:

[0016] One end of the synchronous belt is pressed onto the first synchronous belt mounting block, and the first synchronous belt mounting block is received in the first accommodating groove.

[0017] In the embodiment of the present application, one end of the synchronous belt can be firmly fixed in the first receiving groove by the first synchronous belt mounting block; and when it is necessary to operate on the end, the synchronous belt can be removed by removing the first synchronous belt mounting block. This synchronous belt fixing method is low-cost.

[0018] In combination with the first possible implementation of the first aspect, in a second possible implementation, the synchronous belt is wound around the driving wheel of the 3D printer; and the synchronous belt fixing cover is fixed to a side of the bracket facing the driving wheel.

[0019] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in a third possible implementation, the synchronous belt tensioning device further includes a second synchronous belt mounting block extending through a gap provided in the tensioning block;

[0020] The tensioning block is fixedly connected to the other end of the synchronous belt, and includes:

[0021] The other end of the synchronous belt passes through the tensioning block from the gap, and the second synchronous belt mounting block is accommodated in the gap.

[0022] In the embodiment of the present application, the other end of the synchronous belt can be fixedly connected to the tensioning block through the gap in the tensioning block and the second synchronous belt mounting block. At this time, the tensioning of the synchronous belt can be achieved by adjusting the position of the tensioning block.

[0023] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in a fourth possible implementation, the tensioning block is provided with a hole along the moving direction of the synchronous belt;

[0024] The synchronous belt tensioning device also includes:

[0025] an elastic member, one end of which is received in the hole of the tensioning block;

[0026] A tensioning block cover is provided on a side of the bracket away from the first receiving groove, and the tensioning block cover is connected to the other end of the elastic member; the tensioning block cover is provided with a fixed connecting member fixedly connected to the bracket.

[0027] In the embodiment of the present application, the position of the tensioning block is adjusted by an elastic member. Compared with directly manually adjusting the position of the tensioning block, it can be adjusted more accurately and can also avoid applying excessive tension to the synchronous belt.

[0028] In conjunction with the fourth possible implementation of the first aspect, a fifth possible implementation further includes:

[0029] A guide member, one end of which protrudes from the tensioning block cover plate, and the other end of which passes through the axis of the elastic member and abuts against a side of the tensioning block away from the tensioning block cover plate.

[0030] In the embodiment of the present application, the guide member can guide the elastic member, so that the elastic force of the elastic member can be applied to the tensioning block more accurately, and the elastic member can be prevented from popping out.

[0031] In combination with the first aspect or any one of the above possible implementations of the first aspect, in a sixth possible implementation, the adjustment hole is a waist-shaped hole.

[0032] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in a seventh possible implementation, the bracket is connected to a print head of the 3D printer.

[0033] In the embodiment of the present application, the synchronous belt corresponding to the print head can be tensioned in a space-saving manner.

[0034] In combination with the first aspect or with the first to sixth possible implementations of the first aspect, in an eighth possible implementation, the bracket is connected to the hot bed of the 3D printer.

[0035] In the embodiment of the present application, the synchronous belt corresponding to the print head can be tensioned in a space-saving manner.

[0036] In a second aspect, an embodiment of the present application further provides a 3D printer, comprising a synchronous belt and a synchronous belt tensioning device described in combination with the first aspect or in combination with any one of the above possible implementations of the first aspect.

[0037] In a third aspect, an embodiment of the present application further provides a 3D printer system, comprising a 3D printer and a 3D printer described in any one of the above-mentioned possible implementations of the second aspect; wherein the feeding device is connected to the 3D printer.

[0038] It should be understood that the implementation and beneficial effects of the above-mentioned aspects of the present application can be referenced to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic diagram of a tensioning pulley of a 3D printer system in the prior art;

[0040] FIG2 is a schematic diagram of a scenario of a 3D printing system provided in an embodiment of the present application;

[0041] FIG3 a is a schematic structural diagram of a synchronous belt tensioning device provided in an embodiment of the present application;

[0042] FIG3 b is another structural schematic diagram of a synchronous belt tensioning device provided in an embodiment of the present application;

[0043] FIG3 c is another structural schematic diagram of a synchronous belt tensioning device provided in an embodiment of the present application;

[0044] FIG4 is a partial enlarged view of position A in FIG3c;

[0045] FIG5 is another structural schematic diagram of a synchronous belt tensioning device provided in an embodiment of the present application;

[0046] FIG6a is a cross-sectional view of the synchronous belt at position BB in FIG4 ;

[0047] FIG6 b is a cross-sectional view of the synchronous belt inserted into the position BB in FIG4 ;

[0048] FIG7a is a partial enlarged view of position C in FIG3b;

[0049] FIG7b is a schematic structural diagram of FIG7a from another angle;

[0050] FIG8 is another structural schematic diagram of a synchronous belt tensioning device provided in an embodiment of the present application;

[0051] FIG9 is a cross-sectional view taken along line DD in FIG8 . DETAILED DESCRIPTION

[0052] The implementation of the technical solution of the present application is further described in detail below with reference to the accompanying drawings.

[0053] 2 , which is a schematic diagram of a 3D printing system according to an embodiment of the present invention, as shown in FIG2 , a 3D printing system 20 includes a feeding device 201 and a 3D printer 202 connected to the feeding device 201 .

[0054] The feeding device 201 can be used to suspend a material tray with printing material wound around it. The feeding device 201 can provide the printing material to the 3D printer 202, or the printing material can be rewound back to the material tray through the feeding device 201. In other words, the feeding device 201 can both feed and withdraw material.

[0055] The 3D printer 202 includes a print head 2021, which includes a material guide unit 20211, a nozzle 20212, and an extrusion assembly disposed between the material guide unit 20211 and the nozzle 20212. During material feeding from the feeder 201, the printing material passes through the material guide unit 20211 and then enters the extrusion assembly, which delivers the printing material to the nozzle 20212. During material withdrawal from the feeder 201, the 3D printer 202 cuts the printing material in the print head 2021, and the extrusion assembly delivers the printing material to the feeder 201.

[0056] Optionally, the 3D printer 202 may, for example, cut the printing material between the extrusion assembly and the nozzle 20212 or may cut the printing material in the extrusion assembly, etc. This application does not limit the position where the 3D printer cuts the printing material.

[0057] Illustratively, the 3D printer 202 also includes a print panel 2023, a heated bed 2024, a base 2025a, and a slider 2029a. The heated bed 2024 is located on the side of the base 2025a facing the nozzle 20212 and has a heating function. The print panel 2023 is located on the side of the heated bed 2024 facing the nozzle 20212. Heat from the heated bed 2024 is transferred to the print panel 2023, and the nozzle 20212 extrude molten printing material onto the print panel 2023. Optionally, the 3D printer 202 also includes a base 2025b and a slider 2029b.

[0058] In a specific implementation, the 3D printer can adjust the temperatures of the nozzle 20212 and the heated bed 2024. The nozzle 20212 temperature is adjusted to heat the printing material to a molten state, and the heated bed 2024 temperature is adjusted to adhere the printing material extruded from the nozzle 20212 to the printing panel 2023. The print head 2021 is slidably connected to the first guide rail 2026. A motor-driven driving wheel, via a synchronous belt, pulls the print head 2021 along the length of the first guide rail 2026, thereby achieving displacement of the print head 2021 relative to the printing panel 2023. The heated bed 2024 is slidably connected to the second guide rail 2027. A motor-driven driving wheel, via a synchronous belt, pulls the heated bed 2024 along the length of the second guide rail 2027, thereby achieving displacement of the print head 2021 relative to the printing panel 2023. The length of the second guide rail 2027 is perpendicular to the length of the first guide rail 2026. Furthermore, the first guide rail 2026 is slidably connected to the third guide rail 2028. By moving the first guide rail 2026 along the third guide rail 2028, the 3D printer 202 can achieve displacement of the print head 2021 relative to the print panel 2023 in a direction perpendicular to the length of the second guide rail 2027 and in a direction perpendicular to the length of the first guide rail 2026. In other words, the 3D printer 202 can achieve three mutually perpendicular printing paths to print a three-dimensional object.

[0059] The present application provides a synchronous belt with a synchronous belt tensioning device, in which a tensioning block is arranged on a bracket of a fixed slider, and tensioning force is applied to the synchronous belt by adjusting the position of the tensioning block. Compared with tensioning the synchronous belt through a tensioning wheel, the embodiment of the present application can reduce the space required for tensioning the synchronous belt and has good compactness.

[0060] The structure of the synchronous belt tensioning device will be described in detail below with reference to FIG. 3 a to FIG. 9 .

[0061] Please refer to Figures 3a to 3c. Figure 3a is a structural schematic diagram of the synchronous belt tensioning device provided in an embodiment of the present application. Figure 3b is another structural schematic diagram of the synchronous belt tensioning device provided in an embodiment of the present application. Figure 3c is a structural schematic diagram of the synchronous belt tensioning device provided in an embodiment of the present application.

[0062] The synchronous belt 300 is wound around a driving pulley 304 and a driven pulley 305. The driving pulley 304 is connected to the motor shaft of a motor 303. For example, the motor 303 is mounted on a motor base 302, which is mounted on a frame 301. Specifically, the motor 303 can be used to drive the driving pulley 304 to rotate. When the driving pulley rotates, the synchronous belt moves, thereby driving the driven pulley 305 to rotate.

[0063] The frame 301 may also be provided with a guide rail 306 arranged parallel to the synchronous belt 300; a slider 307 is provided on the guide rail 306 and is also connected to the synchronous belt 300. When the synchronous belt 300 moves, the synchronous belt 300 can drive the slider 307 to move along the guide rail 306. The slider 307 is also fixedly connected to a bracket 308, which is provided with a first receiving slot and a second receiving slot; the first receiving slot is separated from the second receiving slot.

[0064] Please refer to Figure 4, which is a partial enlarged view of position A in Figure 3c. As shown in Figure 4, a tensioning block 401 is disposed in the second receiving slot of bracket 308, and tensioning block 401 has a fixing hole 404. For example, the second receiving slot can be located on the side of bracket 308 near driven pulley 305.

[0065] For example, the fixing hole 404 can be implemented as a screw hole.

[0066] The bracket 308 is further provided with an adjustment hole 402 , which is arranged corresponding to the fixing hole 404 of the tensioning block 401 .

[0067] The fixing member is then connected to the fixing hole 404 of the tensioning block 401 within the adjustment range of the adjustment hole 402, thereby securing the tensioning block 401 to the bracket 308. For example, the fixing member may be a screw or a fixed shaft. For example, the adjustment hole on the bracket 308 may be referred to as a fixing hole, and the fixing hole on the tensioning block 401 may be referred to as an adjustment hole. Alternatively, the fixing hole may be provided on either the tensioning block or the bracket.

[0068] Optionally, please refer to Figures 5 to 6b, Figure 5 is another structural schematic diagram of the synchronous belt tensioning device provided in an embodiment of the present application, Figure 6a is a cross-sectional view of the synchronous belt at BB in Figure 4 without insertion, and Figure 6b is a cross-sectional view of the synchronous belt at BB in Figure 4 with insertion.

[0069] As shown in FIG. 5 , the synchronous belt tensioning device may further include a second synchronous belt mounting block 501 disposed in the second accommodating groove. The second synchronous belt mounting block 501 may be used to fix the other end of the synchronous belt 300 on the tensioning block 401 .

[0070] In a specific implementation, as shown in FIG. 6 a , a gap 608 penetrating the tensioning block 401 may be provided in the tensioning block 401 .

[0071] The other end of the synchronous belt 300 can pass through the tensioning block 401 through the gap 608. At this time, the cross-sectional view of the synchronous belt tensioning device changes from FIG. 6a to FIG. 6b.

[0072] Among them, the second synchronous belt mounting block 501 is accommodated in the gap. By filling the gap with the second synchronous belt mounting block 501, the other end of the synchronous belt 300 can be fixedly connected to the tensioning block 401. Exemplarily, the thickness of the second synchronous belt mounting block can be consistent with the opening diameter of the gap, or it can be set so that the thickness of the second synchronous belt mounting block is smaller than the opening diameter of the gap, but the sum of the thickness of the second synchronous belt mounting block and the thickness of the synchronous belt is greater than the opening diameter of the gap, so as to ensure that the synchronous belt can be stably fixed in the gap. When implementing the embodiment of the present application, when it is necessary to adjust this end of the synchronous belt, the second synchronous belt mounting block can be removed to separate the synchronous belt from the tensioning block, thereby improving the flexibility of the structure.

[0073] Optionally, the other end of the synchronous belt may be adhered to the tensioning block to achieve a fixed connection between the tensioning block and the synchronous belt.

[0074] In some feasible embodiments, the tension block 401 is provided with a hole along the moving direction of the synchronous belt 300. At this time, one end of the elastic member 602 is received in the hole of the tension block 401; illustratively, the elastic member 602 can be a spring.

[0075] The tensioning block cover 603 is arranged on a side of the bracket 308 away from the first receiving groove, and the tensioning block cover 603 is connected to the other end of the elastic member 602; the tensioning block cover 603 is provided with a fixed connecting member 604 fixedly connected to the bracket 308.

[0076] Exemplarily, the tensioning block 401 may be provided with a hole with one end closed and the other end open along the direction of movement of the synchronous belt 300, one end of the elastic member 602 may be placed in the hole, and the other end of the elastic member 602 may extend from the hole and be connected to the tensioning block cover 603; optionally, the tensioning block cover 603 may be provided on the side of the bracket away from the first accommodating groove.

[0077] The tensioning block cover 603 may be provided with a fixed connection piece 604 for fixed connection with the bracket 308; the fixed connection piece 604 may loosen the fixed connection between the tensioning block cover 603 and the bracket 308 during adjustment; when the tensioning block of the synchronous belt is adjusted by changing the elastic force of the elastic piece, the tensioning block cover 603 is fixedly connected to the bracket 308 to ensure that the elastic piece 602 can stably apply elastic force to the tensioning block.

[0078] Exemplarily, the fixed connection member 604 can be a tensioning block cover screw, and a stud 605 for fixing the tensioning block cover 603 can be provided on the bracket 308. The tensioning block cover 603 can be connected to the bracket through the tensioning block cover screw. When the screw head of the tensioning block cover screw presses against the tensioning block cover 603, a certain gap can exist between the stud 605 and the tensioning block cover 603 due to the elastic force of the elastic member 602; at this time, if the tensioning block cover 603 continues to be close to the stud 605, the screw head can apply pressure to the tensioning block cover 603, and the elastic member 602 can be subjected to an elastic force.

[0079] After being subjected to elastic force, the elastic member 602 will apply a force to the tensioning block 401; further, the tensioning block 401 subjected to the force will drive the second synchronous belt mounting block 501, thereby applying a tensioning force to the other end of the synchronous belt 300 fixed by the second synchronous belt mounting block 501 and the tensioning block 401.

[0080] Exemplarily, the fixing hole 606 on the tensioning block 401 may be provided on a side surface of the tensioning block 401 .

[0081] In some feasible embodiments, a guide member 607 may also be included, one end of which protrudes from the tensioning block cover 603, and the other end of the guide member 607 passes through the axis of the elastic member 602 and abuts against the side of the tensioning block 401 away from the tensioning block cover 603.

[0082] Optionally, the guide member 607 can guide the tension block cover 603 and the elastic member 602. The guide member 607 can first pass through the axis of the tension block cover 603, then through the axis of the elastic member 602, and connect to the closed end of the tension block 401. When the tension block cover is screwed into the stud, the tension block cover 603 can move toward the tension block 401 along the guide member 607. The tension block cover 603 approaching the tension block 401 can apply pressure to the elastic member 602. The compressed elastic member 602 applies a spring force to the tension block 401, driving the tension block 401 to move. Moving the tension block 401 applies a tensioning force to the synchronous belt 300, thereby tensioning the synchronous belt 300. Implementing this embodiment of the present application allows for more precise adjustment by utilizing the elastic force of the elastic member and avoids excessive tension on the synchronous belt, which could result in over-tensioning.

[0083] In some feasible implementations, the adjustment hole may be a waist-shaped hole or a hole of other shapes, and the embodiments of the present application are not limited thereto.

[0084] Please refer to Figures 7a to 9, Figure 7a is a partial enlarged view of position C in Figure 3b; Figure 7b is a structural schematic diagram of Figure 7a from another angle; Figure 8 is another structural schematic diagram of the synchronous belt tensioning device provided in an embodiment of the present application; Figure 9 is a cross-sectional view at DD in Figure 8.

[0085] As shown in Figures 7a and 7b, the bracket 308 includes a synchronous belt fixing cover plate 701, and the synchronous belt fixing cover plate 701 is provided with the first receiving groove; the synchronous belt tensioning device further includes a first synchronous belt mounting block 706;

[0086] One end of the synchronous belt 300 is pressed onto the first synchronous belt mounting block 706 , and the first synchronous belt mounting block 706 is received in the first receiving groove.

[0087] Exemplarily, as shown in FIG7 a , the synchronous belt fixing cover 701 is disposed in the first receiving groove, and the tensioning block 401 is disposed in the second receiving groove.

[0088] The side of the tension block 401 is provided with a fixing hole, and the adjustment hole can be set on the anti-rotation pad 702 of the bracket. The fixing hole and the adjustment hole are connected by a fixing member 703. The guide member 904 passes through the tension block cover 603 and the elastic member 704 in sequence; the tension block cover 603 is fixed to the stud 605 on the bracket via a fixing connector 604.

[0089] As shown in FIG7 b , the synchronous belt fixing cover 701 is fixedly connected to the bracket via the synchronous belt fixing cover screws 705 ; the first synchronous belt mounting block 706 fixes one end of the synchronous belt to the synchronous belt fixing cover 701 .

[0090] For example, as shown in Figures 8 and 9, when securing one end of the synchronous belt 300 to the first receiving slot, the end of the synchronous belt 300 can be first pressed into the first receiving slot of the synchronous belt fixing cover 701 on the bracket; then, the first synchronous belt mounting block 706 can be inserted into the first receiving slot. The first synchronous belt mounting block 706 is squeezed to secure the end of the synchronous belt 300 to the first receiving slot. The thickness of the first synchronous belt mounting block can be consistent with the opening diameter of the first receiving slot, or it can be configured such that the thickness of the first synchronous belt mounting block is smaller than the opening diameter of the first receiving slot, but the sum of the thickness of the first synchronous belt mounting block and the thickness of the synchronous belt is greater than the opening diameter of the first receiving slot, to ensure that the synchronous belt is stably secured in the first receiving slot. Implementing this embodiment of the present application ensures that one end of the synchronous belt is stably secured to the synchronous belt fixing cover. Furthermore, when the end of the synchronous belt needs to be adjusted, the first synchronous belt mounting block can be removed to separate the synchronous belt from the synchronous belt fixing cover, thereby increasing the flexibility of the structure.

[0091] Optionally, the synchronous belt fixing cover is fixed on a side of the bracket facing the driving wheel.

[0092] The first receiving groove of the bracket 308 can be fixed to one end of the synchronous belt 300, and the tensioning block 401 in the second receiving groove of the bracket 308 can be fixedly connected to the other end of the synchronous belt 300; since one end of the synchronous belt 300 is fixed to the bracket 308, the position of the other end of the synchronous belt 300 can be adjusted by adjusting the position of the tensioning block 401, thereby applying a tensioning force to the synchronous belt 300, thereby achieving tensioning of the synchronous belt 300.

[0093] The first accommodating groove in the bracket 308 can be on the side of the bracket 308 close to the driving wheel 304, and one end of the synchronous belt 300 is fixed to the first accommodating groove; of course, the first accommodating groove in the bracket can also be on the side of the bracket close to the driven wheel, and the second accommodating groove can be on the side of the bracket close to the driving wheel, and the embodiment of the present application does not limit this.

[0094] In some feasible implementations, the bracket is connected to the print head of the 3D printer; by implementing the embodiments of the present application, the tensioning of the synchronous belt corresponding to the print head can be achieved based on a smaller space occupation.

[0095] In some feasible implementations, the bracket is connected to the hot bed of the 3D printer. By implementing the embodiment of the present application, the tensioning of the synchronous belt corresponding to the hot bed can be achieved with a smaller space occupation.

[0096] In some feasible implementations, the 3D printer may include both a heat bed and a print head, and the bracket may include a first bracket and a second bracket;

[0097] The heated bed can be connected to the first bracket, and the print head can be connected to the second bracket; thus, the heated bed can move driven by the first bracket, and the print head can also move driven by the second bracket.

[0098] It should be noted that the above terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

Claims

1. A synchronous belt tensioning device for a 3D printer, characterized in that: The 3D printer comprises a bracket and a synchronous belt, one end of the synchronous belt is fixed to one side of the bracket; The synchronous belt tensioning device comprises: A tensioning block is slidably connected to the bracket, and the tensioning block is fixedly connected to the other end of the synchronous belt; A fixing assembly is arranged within the sliding range of the tension block to fix the tension block to the bracket at any position within the sliding range.

2. The synchronous belt tensioning device according to claim 1, characterized in that: The fixing assembly comprises a fixing hole and a fixing piece connected to the fixing hole, wherein the fixing hole is arranged on the tensioning block or on the bracket.

3. The synchronous belt tensioning device according to claim 2, characterized in that: The fixing hole is provided on the tensioning block; The fixing assembly further comprises an adjustment hole, which is located on the bracket and is arranged corresponding to the fixing hole of the tensioning block; A fixing member is connected to the fixing hole of the tensioning block within the adjustment range of the adjustment hole, so as to fix the tensioning block to the bracket at any position within the sliding range.

4. The synchronous belt tensioning device according to claim 1, characterized in that: The bracket includes a synchronous belt fixing cover plate, and the synchronous belt fixing cover plate is provided with the first accommodating groove; the synchronous belt tensioning device also includes a first synchronous belt mounting block; The first receiving groove fixes one end of the synchronous belt, and includes: One end of the synchronous belt is pressed on the first synchronous belt mounting block, and the first synchronous belt mounting block is received in the first accommodating groove.

5. The synchronous belt tensioning device according to claim 4, characterized in that: The synchronous belt is wound around the driving wheel of the 3D printer; and the synchronous belt fixing cover is fixed on a side of the bracket facing the driving wheel.

6. The synchronous belt tensioning device according to any one of claims 1 to 5, characterized in that: The synchronous belt tensioning device further comprises a second synchronous belt mounting block, which penetrates a gap provided in the tensioning block; The tension block is fixedly connected to the other end of the synchronous belt, and includes: The other end of the synchronous belt passes through the tensioning block from the gap, and the second synchronous belt mounting block is received in the gap.

7. The synchronous belt tensioning device according to any one of claims 1 to 6, characterized in that: The synchronous belt tensioning device also includes: An elastic member, one end of which is connected to the tensioning block; A tensioning block cover plate is connected to the other end of the elastic member; and the tensioning block cover plate is provided with a fixed connecting member connected to the bracket.

8. The synchronous belt tensioning device according to claim 7, characterized in that: Also includes: A guide member, one end of which protrudes from the tension block cover plate, and the other end of which passes through the axis of the elastic member and abuts against a side of the tension block away from the tension block cover plate.

9. The synchronous belt tensioning device according to claim 3, characterized in that: The adjusting hole is a waist-shaped hole.

10. The synchronous belt tensioning device according to any one of claims 1 to 9, characterized in that: The bracket is connected to the print head of the 3D printer.

11. The synchronous belt tensioning device according to any one of claims 1 to 9, characterized in that: The bracket is connected to the hot bed of the 3D printer.

12. A 3D printer, characterized in that: The 3D printer comprises a synchronous belt and a synchronous belt tensioning device as claimed in any one of claims 1 to 11.

13. A 3D printing system, characterized in that: It comprises a feeding device and a 3D printer as claimed in claim 12; wherein the feeding device is connected to the 3D printer.

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