Tensioning device, belt transmission device and three-dimensional forming equipment

Abstract

The utility model provides a tensioning device, a belt transmission device and three-dimensional forming equipment. The tensioning device comprises a fixed seat; the sliding seat is in sliding connection with the fixed seat, a tensioning wheel rotationally connected with the sliding seat is arranged on the sliding seat, and the tensioning wheel is used for winding a synchronous belt; the two ends of the elastic piece are connected with the sliding seat and the fixed seat correspondingly, and the elastic piece is in an energy storage state so that the sliding seat can slide relative to the fixed seat to tension the synchronous belt; and the limiting assembly comprises a locking piece and a direction limiting structure, the direction limiting structure is used for limiting the direction of the relative movement of the fixed seat and the sliding seat, and the locking piece is used for limiting the relative movement of the fixed seat and the sliding seat. Therefore, the stability and constancy of the magnitude of the tensioning force provided by the tensioning wheel to the synchronous belt can be ensured, the sliding seat can be stably and enduringly kept at a proper position relative to the fixed seat so as to prolong the durability of the synchronous belt in a tensioning state, and the reliability of the tensioning device can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of printing equipment, in particular to a tensioning device, a belt transmission device and a three-dimensional forming device. Background Art

[0002] In a three-dimensional forming device, such as an FDM (Fused Deposition Modeling) printer, a guide frame drives a print head to descend to a preset position, and a nozzle of the print head selectively sprays materials onto a print platform in a scanning manner according to the cross-sectional shape of a product. After the materials are cooled, the first layer of the printed product is formed. The guide frame drives the print head to rise by one layer, and the second layer is printed on the basis of the first layer, and three-dimensional printing is achieved by layer-by-layer accumulation.

[0003] In current FDM printers, a print platform or a print head can be connected to a base through a belt transmission mechanism to achieve the movement of the print platform or the print head in the XY plane. For the tensioning of the belt, usually, a user needs to tighten a screw by hand to tighten a synchronous pulley and synchronously tighten the belt. In this way, the tensioning force of the belt varies from person to person. However, a relatively large tensioning force will make the belt too tight, which easily causes the motor to lose steps and result in printing defects, such as vertical stripes and layer lines in the printed product. And a relatively small tensioning force makes the belt too loose, which easily causes the phenomenon of belt slipping, resulting in problems such as delayed printing actions, printing misalignment, and wavy patterns in the printed product. Summary of the Utility Model

[0004] In view of this, the utility model provides a tensioning device, a belt transmission device and a three-dimensional forming device, so that the tensioning force of a sliding seat on a synchronous belt is related to the elastic deformation of an elastic member, and is not affected by personal factors of the user. It can ensure the stability and constancy of the tensioning force provided by a tensioning pulley to the synchronous belt, and can make the sliding seat stably and durably maintain a proper position relative to a fixed seat to extend the durability of the tensioning state of the synchronous belt, and can improve the reliability of the tensioning device.

[0005] In the first aspect of the utility model, a tensioning device for tensioning a synchronous belt is provided. The tensioning device includes: a fixed seat; a sliding seat, which is slidably connected to the fixed seat, and a tensioning pulley rotatably connected to the sliding seat is arranged on the sliding seat, and the tensioning pulley is used for winding the synchronous belt; an elastic member, the two ends of which are respectively connected to the sliding seat and the fixed seat, and the elastic member is in an energy storage state to enable the sliding seat to slide relative to the fixed seat to tension the synchronous belt; a limiting component, the limiting component includes a locking member and a direction limiting structure, the direction limiting structure is located on the surfaces of the fixed seat and the sliding seat in contact with each other to limit the direction of the relative movement of the fixed seat and the sliding seat, and the locking member is used for connecting the fixed seat and the sliding seat to limit the relative movement of the fixed seat and the sliding seat.

[0006] Optionally, the number of locking members is one, the limiting structure is set as a unidirectional limiting structure, and the limiting direction of the limiting structure is the direction to relax the synchronous belt.

[0007] Optionally, the sliding direction of the sliding seat relative to the fixed seat includes a first direction and a second direction. The elastic member releases elastic potential energy to drive the sliding seat to slide relative to the fixed seat along the first direction, and the second direction is opposite to the first direction. The limiting structure is used to limit the movement of the sliding seat relative to the fixed seat along the second direction.

[0008] Optionally, a limiting structure is provided on at least one side of the locking member. The limiting structure includes a first limiting portion provided on the sliding seat and a second limiting portion provided on the fixed seat. The first limiting portion includes a plurality of first tooth portions, and the second limiting portion includes a plurality of second tooth portions that match the first tooth portions.

[0009] Optionally, the fixed seat is provided with an adjustment hole extending along the movement direction of the sliding seat and the fixed seat. A limiting hole is provided on the sliding seat, and the locking member passes through the adjustment hole and is connected to the limiting hole to lock and fix the sliding seat and the fixed seat; the tensioning device is applied to a three-dimensional forming device, and the three-dimensional forming device includes a frame. The fixed seat is fixedly connected to the frame or integrally formed with the frame.

[0010] Optionally, a guide rail is provided or formed on one of the sliding seat and the fixed seat, and a guide member is provided or formed on the other. The guide member and the guide rail are movably connected so that the sliding seat can slide relative to the fixed seat.

[0011] Optionally, the elastic member is in a compressed state. The first end of the elastic member is relatively fixed to the fixed seat, and the second end of the elastic member is connected to the sliding seat. The elastic member is a spring, a spring sheet, or elastic glue; or the elastic member is in a stretched state, and the elastic member is a tension spring. The first end of the tension spring is relatively fixed to the fixed seat, and the second end of the tension spring is connected to the sliding seat; or the elastic member is in a torsional state, and the elastic member is a torsion spring. The first torsion arm of the torsion spring is connected to or abuts against the fixed seat, and the second torsion arm of the torsion spring is connected to or abuts against the sliding seat.

[0012] Optionally, the tensioning device further includes: a connecting cover, the connecting cover is detachably connected to the fixed seat, the elastic member is a spring, and the first end of the spring is connected to the connecting cover.

[0013] Optionally, the fixed seat is provided with a first installation space and a channel. The first end of the channel is communicated with the first installation space, and the second end of the channel penetrates the fixed seat along the sliding direction of the sliding seat relative to the fixed seat. The first installation space is used to accommodate the sliding seat. The connecting cover is located outside the fixed seat to cover the second end of the channel, and the second end of the spring passes through the channel and is connected to the sliding seat.

[0014] Optionally, the carriage is provided with an accommodation space for accommodating the tensioning pulley, and a connection hole for connecting the second end of the spring is provided on one side of the carriage facing the channel; the tensioning device further includes a first rotating shaft, the first rotating shaft is connected to the carriage and passes through the accommodation space, and the tensioning pulley is rotatably connected to the first rotating shaft.

[0015] In a second aspect of the present invention, a belt drive device is provided, which is applied to a three-dimensional forming device. The belt drive device includes: a synchronous belt; and the tensioning device according to any one of the first aspect.

[0016] Optionally, the synchronous belt and the tensioning device correspond to each other, the number of the synchronous belt and the tensioning device is one or more and equal, and a plurality of synchronous belts are arranged at intervals along the axial direction of the tensioning pulley of the tensioning device.

[0017] Optionally, the fixed seats of two adjacent tensioning devices among a plurality of tensioning devices are detachably connected or integrated into an integral structure.

[0018] Optionally, the belt drive device further includes: a driving part and an idler pulley. The driving part and the idler pulley are installed on the frame of the three-dimensional forming device. The driving part includes a synchronous pulley, and the synchronous belt is sleeved and connected to the synchronous pulley, the idler pulley, and the tensioning pulley of the tensioning device.

[0019] Optionally, the frame is provided with a second installation space for accommodating the idler pulley. The first installation space and the channel of the fixed seat are located on both sides of the second installation space; the belt tensioning device further includes a second rotating shaft, the second rotating shaft is connected to the frame and passes through the second installation space, and the idler pulley is rotatably connected to the second rotating shaft.

[0020] In a third aspect of the present invention, a three-dimensional forming device is provided, which includes: a driven member to be driven, and the belt drive device according to any one of the second aspect, and the driven member to be driven is driven to move by a belt.

[0021] Optionally, the three-dimensional forming device further includes: a frame, the fixed seat of the belt drive device is installed on the frame, and the belt drive device drives the driven member to be driven to move relative to the frame; the number of the driven members to be driven is at least one, and the driven members to be driven include at least one of a printing platform and a print head.

[0022] The tensioning device, belt drive device and three-dimensional forming device provided by the embodiments of the present utility model. The tensioning device includes a fixed seat, a sliding seat, a tensioning wheel, an elastic member and a limiting assembly. The sliding seat is slidably connected to the fixed seat. The tensioning wheel is arranged on the sliding seat and wound around the synchronous belt of the belt drive device. The synchronous wheel connects the belt drive device and the tensioning device. The two ends of the elastic member are respectively connected to the sliding seat and the fixed seat. The elastic member is in an energy storage state to enable the sliding seat to slide relative to the fixed seat to tension the synchronous belt. During the tensioning operation of the synchronous belt, the elastic force is applied to the sliding seat by the elastic deformation of the elastic member, and it will not be affected by personal factors of the user. Compared with the related technology where the user tightens the synchronous wheel by hand-tightening the screw to achieve the belt tensioning operation, which may result in different tensioning forces of the synchronous belt due to different operations by different people, this embodiment can ensure the stability and constancy of the tensioning force provided by the tensioning wheel to the synchronous belt, thereby ensuring good printing quality. At the same time, by jointly limiting the relative movement of the fixed seat and the sliding seat through the locking member and the limiting structure, the phenomenon that the synchronous belt of the belt drive device drives the sliding seat to move relative to the fixed seat through the tensioning wheel can be reduced, which is beneficial to ensuring a good and lasting tensioning effect of the synchronous belt, and can reduce the force on the locking member, improve the service life of the locking member, and improve the reliability of the tensioning device. The limiting structure can prevent the sliding seat from moving in an unnecessary direction when the tensioning device is affected by vibration or the like after the locking member is locked, improving the fixed connection effect between the sliding seat and the fixed seat.

[0023] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Brief Description of the Drawings

[0024] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. And throughout the drawings, the same reference numerals are used to represent the same components. Among them:

[0025] Figure 1 Shows a structural schematic diagram of one perspective of the belt drive device of the present utility model;

[0026] Figure 2 Shows a partial cross-sectional view of one perspective of the belt drive device of the present utility model;

[0027] Figure 3 Shows a structural schematic diagram of one perspective of a partial structure of the belt drive device of the present utility model;

[0028] Figure 4 ShowsFigure 3 Explosion schematic diagram of the belt drive device of the illustrated embodiment;

[0029] Figure 5 Schematic structural diagram of another perspective showing a partial structure of the belt drive device of the present utility model;

[0030] Figure 6 Shows Figure 5 Explosion schematic diagram of the belt drive device of the illustrated embodiment;

[0031] Figure 7 Schematic structural diagram of one perspective of the fixing seat of the present utility model;

[0032] Figure 8 Schematic structural diagram of one perspective of the sliding seat of the present utility model.

[0033] Wherein, Figures 1 to 8 The corresponding relationship between the reference numerals and the component names in the figure is as follows:

[0034] 100 tensioning device, 110 fixing seat, 111 adjustment hole, 112 guide member, 113 first installation space, 114 channel, 115 second installation space, 116 second limiting portion, 120 sliding seat, 121 limiting hole, 122 first limiting portion, 123 guide rail, 124 accommodation space, 125 connection hole, 126 first installation hole, 130 tensioning wheel, 140 elastic member, 150 limiting assembly, 151 locking member, 152 limiting structure, 160 connection cover, 161 first connecting member, 170 first rotating shaft, 200 belt drive device, 210 synchronous belt, 220 driving portion, 221 synchronous pulley, 222 driving member, 230 idler pulley, 240 second rotating shaft, 250 second connecting member. Detailed implementation manners

[0035] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments may be combined with each other.

[0036] Next, with reference to Figures 1 to 8 Describe the tensioning device 100, the belt drive device 200 and the three-dimensional forming device provided according to some embodiments of the present utility model. Among them, the tensioning device 100 is for the belt drive device 200 and is used to perform a tensioning operation on the synchronous belt 210 of the belt drive device 200. The belt drive device 200 is for the three-dimensional forming device, and the three-dimensional forming device may include a print head and a forming platform. The belt drive device 200 is used to drive the print head and / or the print platform to move along a plane or a direction such as the XY plane. Among them, the XY plane may be as Figure 1and Figure 2 As shown by the arrow in Figure 2 , the three-dimensional forming device can be a printer of the fused deposition type.

[0037] Such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown in Figure 1 , Figure 2 , Figure 3 , and Figure 4 , an embodiment of the first aspect of the present invention provides a tensioning device 100 for tensioning a timing belt 210. The tensioning device 100 includes: a fixed seat 110; a sliding seat 120 slidably connected to the fixed seat 110, with a tensioning wheel 130 provided on the sliding seat 120 for winding the timing belt 210; an elastic member 140 having two ends respectively connected to the sliding seat 120 and the fixed seat 110, the elastic member 140 being in an energy storage state to cause the sliding seat 120 to slide relative to the fixed seat 110 for tensioning the timing belt 210; and a limiting assembly 150 including a locking member 151 and a limiting structure 152. The limiting structure 152 is located on the mutually contacting surfaces of the fixed seat 110 and the sliding seat 120 to limit the direction of relative movement between the fixed seat 110 and the sliding seat 120, and the locking member 151 is used to connect the fixed seat 110 and the sliding seat 120 to limit the relative movement between the fixed seat 110 and the sliding seat 120.

[0038] The tensioning device 100 provided by the embodiment of the present invention includes a fixed seat 110, a sliding seat 120, a tensioning wheel 130, an elastic member 140, and a limiting assembly 150. The sliding seat 120 is slidably connected to the fixed seat 110, and the tensioning wheel 130 is provided on the sliding seat 120 and wound around the timing belt 210 of the belt transmission device 200. It can be understood that the belt transmission device 200 further includes a timing pulley 221 and an idler pulley 230, and the timing belt 210 is sleeved and connected to the timing pulley 221, the tensioning wheel 130, and the idler pulley 230, thereby connecting the belt transmission device 200 and the tensioning device 100.

[0039] Since the two ends of the elastic member 140 are connected to the slide 120 and the fixed seat 110 respectively, the elastic member 140 is in an energy storage state so that the slide 120 slides relative to the fixed seat 110 to tension the synchronous belt. In this way, during the tensioning operation of the synchronous belt 210, the elastic member 140 in the energy storage state releases energy and applies elastic force to the slide 120 by means of the elastic deformation of the elastic member 140. Therefore, the tensioning force of the tensioning wheel 130 on the synchronous belt 210 located on the slide 120 is related to the elastic deformation of the elastic member 140 and will not be affected by the user's personal factors. Compared with the related art in which the user manually tightens the screw to tighten the synchronous wheel to achieve the belt tensioning operation, which will result in different tensioning forces of the synchronous belt 210 due to different operations by different people, the present embodiment applies tensioning force to the tensioning wheel 130 by means of the elastic deformation of the elastic member 140 to achieve the tensioning operation of the synchronous belt 210, and does not require the user to rely on feeling to judge the size of the tensioning force to adjust the tightness of the synchronous belt 210, ensuring that even if different users operate, they are all consistent. The elastic member 140 provides elastic force to the slide 120 without applying force, thereby ensuring the stability and constancy of the tensioning force provided by the tensioning wheel 130 to the synchronous belt 210, so that the tension of the synchronous belt 210 is maintained in an appropriate range, ensuring the movement accuracy of the printing platform or the print head in the XY plane, and avoiding the user's hand-tightening of the screws for belt tensioning operation, which results in a large tension force and a tighter synchronous belt 210, which may easily cause the motor to lose steps and produce printing defects, vertical grain and layer patterns on the printed products, and other problems. At the same time, it avoids the user's hand-tightening of the screws for belt tensioning operation, which results in a small tension force and a loose synchronous belt 210, resulting in belt slippage, resulting in delayed printing action, staggered printing, insufficient speed, and wavy patterns on the printed products. The printing quality is greatly improved and suitable for promotion and application.

[0040] Among them, the limiting component 150 includes a locking member 151 connected to the fixed seat 110 and the sliding seat 120, and a direction limiting structure 152 located on the mutually contacting surfaces of the fixed seat 110 and the sliding seat 120. The direction limiting structure 152 can limit the direction of the relative movement of the fixed seat 110 and the sliding seat 120, and the locking member 151 can limit the relative movement of the fixed seat 110 and the sliding seat 120. Thus, by jointly limiting the relative movement of the fixed seat 110 and the sliding seat 120 by the locking member 151 and the direction limiting structure 152, the phenomenon that the synchronous belt 210 of the belt transmission device 200 drives the sliding seat 120 to move relative to the fixed seat 110 through the tensioning pulley 130 and affects the tensioning effect of the synchronous belt 210 can be reduced, preventing the sliding seat 120 from loosening relative to the fixed seat 110. Moreover, the direction limiting structure 152 plays a role in preventing the sliding seat 120 from retreating under the pulling of the synchronous belt 210, so that after the sliding seat 120 moves relative to the fixed seat 110 to a proper position, it can be reliably and stably maintained at the proper position to ensure a good and lasting tensioning effect of the synchronous belt 210, improve the motion accuracy of the belt transmission device 200, and ensure good printing quality. At the same time, the setting of the direction limiting structure 152 can reduce the force on the locking member 151, improve the service life of the locking member 151, and improve the overall reliability of the tensioning device 100 and the belt transmission device 200.

[0041] Among them, the direction limiting structure 152 is located on the mutually contacting surfaces of the fixed seat 110 and the sliding seat 120, which can be understood as the direction limiting structure 152 being provided on or formed on the fixed seat 110 and located at the position of the mutually contacting surfaces of the fixed seat 110 and the sliding seat 120, or the direction limiting structure 152 being provided on or formed on the sliding seat 120 and located at the position of the mutually contacting surfaces of the fixed seat 110 and the sliding seat 120, or different parts of the direction limiting structure 152 being respectively provided on or formed on the fixed seat 110, provided on or formed on the sliding seat 120, and located at the position of the mutually contacting surfaces of the fixed seat 110 and the sliding seat 120.

[0042] Among them, the locking member 151 is movable relative to the fixed seat 110 and the sliding seat 120, or the locking member 151 is detachably connected to the fixed seat 110 and the sliding seat 120. Thus, moving the locking member 151 relative to the fixed seat 110 and the sliding seat 120 to the first specified position or detaching the locking member 151 from the fixed seat 110 and the sliding seat 120 releases the restriction of the locking member 151 on the relative movement of the fixed seat 110 and the sliding seat 120. At this time, the sliding seat 120 and the fixed seat 110 can move relative to each other. Therefore, under the elastic action of the elastic member 140, the sliding seat 120 slides relative to the fixed seat 110 to a suitable position to achieve the tensioning operation of the synchronous belt 210. Then, move the locking member 151 relative to the fixed seat 110 and the sliding seat 120 to the second specified position or install the locking member 151 on the fixed seat 110 and the sliding seat 120, so that the locking member 151 can limit the relative movement of the sliding seat 120 and the fixed seat 110, and make the sliding seat 120 reliably and stably maintain at a suitable position relative to the fixed seat 110. Since the limiting structure 152 is located on the mutually contacting surfaces of the fixed seat 110 and the sliding seat 120 and limits the direction of the relative movement of the fixed seat 110 and the sliding seat 120, double limiting is achieved by using the locking member 151 and the limiting structure 152, which can further improve the stability and reliability of the sliding seat 120 staying at a suitable position, avoid or reduce the possibility that the sliding seat 120 is pulled away by the synchronous belt 210 and moves relative to the fixed seat 110, resulting in the synchronous belt 210 being too loose or too tight, ensure that the synchronous belt 210 can be stably and durably maintained within a suitable tension range, improve the movement accuracy of the belt transmission device 200, and ensure good printing quality.

[0043] As Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 shown, in some possible implementation embodiments provided by the present utility model, the number of the locking members 151 is one, the limiting structure 152 is set as a unidirectional limiting structure 152, and the limiting direction of the limiting structure 152 is the direction of loosening the synchronous belt 210, that is, the sliding seat 120 cannot move in the direction of loosening the synchronous belt 210.

[0044] Among them, the one-way limiting structure 152 can be understood as that the limiting structure 152 can limit the relative movement of the sliding seat 120 and the fixed seat 110 in one direction, but has no limiting effect on the relative movement of the sliding seat 120 and the fixed seat 110 along its direction. Specifically, the limiting direction of the limiting structure 152 is the direction to relax the synchronous belt 210, that is, the limiting structure 152 does not limit the direction of tensioning the synchronous belt 210. Thus, by cooperating the limiting structure 152 with a one-way limiting function with a locking member 151, when the number of locking members 151 is small, the sliding seat 120 can be reliably and stably maintained in a proper position relative to the fixed seat 110, ensuring that the synchronous belt 210 can be stably and durably maintained within a proper tension range, ensuring the movement accuracy of the belt transmission device 200, so as to improve the printing quality and printing effect. At the same time, compared with a larger number of locking members 151, one locking member 151 is beneficial to reducing the manufacturing cost of the tensioning device 100, and can simplify the disassembly and assembly steps of the locking member 151, thereby improving the tensioning efficiency of the tensioning device 100, reducing the influence of the tensioning operation on the printing time of the stereolithography apparatus, improving the printing efficiency of the stereolithography apparatus, and being suitable for popularization and application.

[0045] As Figure 2 , Figure 3 , Figure 5 shown, in some possible embodiments provided by the present utility model, the sliding direction of the sliding seat 120 relative to the fixed seat 110 includes a first direction and a second direction. The elastic member 140 releases elastic potential energy to drive the sliding seat 120 to slide relative to the fixed seat 110 in the first direction, and the second direction is opposite to the first direction. Among them, the first direction can be as shown by the X+ direction in Figure 2 , and the second direction can be as shown by the X- direction in Figure 2 . The limiting structure 152 is used to limit the movement of the sliding seat 120 relative to the fixed seat 110 in the second direction.

[0046] Since generally, as the use time of the belt transmission device 200 increases, the tension of the synchronous belt 210 will gradually decrease, and the synchronous belt 210 will gradually become loose, affecting the transmission effect and further affecting the printing effect. Therefore, most of the tensioning operations are the process of adjusting the synchronous belt 210 from loose to tight. Therefore, by setting the limiting structure 152 as a one-way limiting structure 152, after the locking member 151 releases the restriction on the relative movement of the sliding seat 120 and the fixed seat 110, during the movement of the sliding seat 120 relative to the fixed seat 110 in the first direction, the limiting structure 152 has no limiting effect on the relative movement of the sliding seat 120 and the fixed seat 110, so that the sliding seat 120 can smoothly move to a proper position in the first direction under the action of the elastic member 140, realizing the tensioning operation of the synchronous belt 210 to realize the adjustment process of the synchronous belt 210 from loose to tight.

[0047] After the locking member 151 releases the restriction on the relative movement of the sliding seat 120 and the fixed seat 110, during the movement of the sliding seat 120 relative to the fixed seat 110 in the second direction, the limiting structure 152 limits the relative movement of the sliding seat 120 and the fixed seat 110, which can prevent the synchronous belt 210 from driving the sliding seat 120 to move backward. Thus, after the sliding seat 120 moves relative to the fixed seat 110 to a suitable position to complete the tensioning operation of the synchronous belt 210, by using the locking member 151 to connect with the sliding seat 120 and the fixed seat 110 to restrict the relative movement of the sliding seat 120 and the fixed seat 110, and then limiting the movement of the sliding seat 120 relative to the fixed seat 110 in the second direction through the limiting structure 152, it can well prevent the sliding seat 120 from being pulled by the tension of the synchronous belt 210, playing the role of preventing the sliding seat 120 from retreating, enabling the sliding seat 120 to be reliably and stably maintained in a suitable position to ensure a good and lasting tensioning effect of the synchronous belt 210, improving the movement accuracy of the belt transmission device 200, and being able to reduce the force on the locking member 151, improve the service life of the locking member 151, and improve the overall reliability of the locking device and the belt transmission device 200.

[0048] It can be understood that if the synchronous belt 210 is relatively tight and the tensioning operation requires loosening the synchronous belt 210 from being tight, after the locking member 151 releases the restriction on the relative movement of the sliding seat 120 and the fixed seat 110, due to the limiting effect of the limiting structure 152 on the movement of the sliding seat 120 relative to the fixed seat 110 in the second direction, under the action of the elastic member 140 and the limiting structure 152, the sliding seat 120 cannot move independently relative to the fixed seat 110 in the second direction. At this time, the user can manually intervene in the synchronous belt 210 to make the synchronous belt 210 drive the sliding seat 120 to move relative to the fixed seat 110 in the second direction to a position that is far from the suitable position of the sliding seat 120. Then, after the user manually intervenes to release, under the action of the elastic member 140, the sliding seat 120 is driven to move to the suitable position automatically, and the automatic tensioning operation of the synchronous belt 210 can be realized.

[0049] As Figure 2 、 Figure 4 、 Figure 6 、 Figure 7 and Figure 8 As shown in

[0050] Further, the limiting structure 152 includes a first limiting portion 122 disposed on the sliding seat 120 and a second limiting portion 116 disposed on the fixed seat 110. The first limiting portion 122 includes a plurality of first teeth, and the second limiting portion 116 includes a plurality of second teeth that match the first teeth. Through the cooperation of the plurality of first teeth on the sliding seat 120 and the plurality of second teeth on the fixed seat 110, after the tensioning operation is completed and the sliding seat 120 and the fixed seat 110 are locked and fixed by the locking member 151, the first teeth and the second teeth cooperate with each other to increase the frictional force on the contact surface between the sliding seat 120 and the fixed seat 110, which can well prevent the sliding seat 120 from being pulled by the tension of the synchronous belt 210, playing a role in preventing the sliding seat 120 from retreating, enabling the sliding seat 120 to be reliably and stably maintained in a proper position to ensure a good and lasting tensioning effect of the synchronous belt 210, improving the motion accuracy of the belt transmission device 200, and being able to reduce the force on the locking member 151, improving the service life of the locking member 151, and improving the overall reliability of the locking device and the belt transmission device 200.

[0051] It can be understood that by reasonably setting the structures of the first teeth and the second teeth, the cooperation between the first teeth and the second teeth can limit the movement of the sliding seat 120 relative to the fixed seat 110 in the second direction, and does not limit the movement of the sliding seat 120 relative to the fixed seat 110 in the first direction.

[0052] Specifically, as Figure 7 and Figure 8 shown, the first teeth are distributed on both sides of the locking member 151, and the second teeth are distributed on both sides of the locking member 151, that is, the limiting structure is distributed on both sides of the locking member 151.

[0053] As Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 8 shown, in some possible embodiments provided by the present utility model, the fixed seat 110 is provided with an adjustment hole 111 extending along the movement direction of the sliding seat 120 and the fixed seat 110. A limiting hole 121 is provided on the sliding seat 120, and the locking member 151 passes through the adjustment hole 111 and is connected to the limiting hole 121 to lock and fix the sliding seat 120 and the fixed seat 110. In this way, after the elastic member 140 provides an elastic force to the sliding seat 120 to move the sliding seat 120 relative to the fixed seat 110 to a proper position for tensioning the synchronous belt 210, by using the locking member 151 to pass through the adjustment hole 111 and connect to the limiting hole 121 on the sliding seat 120, the sliding seat 120 and the fixed seat 110 can be locked and fixed, so that the synchronous belt 210 remains in the tensioned state after the tensioning operation, ensuring good motion accuracy of the belt transmission device 200 and improving the printing quality.

[0054] Furthermore, the adjustment hole 111 can be a long hole, a waist-shaped hole, etc. The extension length of the adjustment hole 111 ensures that the sliding seat 120 moves relative to the fixed seat 110 within a suitable range, so that the sliding seat 120 can move to a suitable position under the combined action of the elastic member 140 and the synchronous belt 210, realizing the tensioning operation of the synchronous belt 210.

[0055] Specifically, the locking member 151 can be a bolt, and the limiting hole 121 on the sliding seat 120 can be a threaded hole. The bolt is a standard part with a low cost, and the threaded hole is convenient to process with a low processing cost, which is suitable for popularization and application. It can be understood that the locking member 151 can also be other structures such as a pin.

[0056] Furthermore, the tensioning device 100 is applied to a three-dimensional forming device, which includes a frame. The fixed seat 110 is fixedly connected to the frame, or the fixed seat 110 and the frame are integrally formed, so as to install the tensioning device 100 on the three-dimensional forming device through the connection between the fixed seat 110 and the frame.

[0057] Specifically, the fixed connection between the fixed seat 110 and the frame of the three-dimensional forming device can be understood as fastening the two together by non-detachable connection methods such as welding or detachable connection methods. That is to say, the fixed seat 110 and the frame can be fixedly connected by at least one of welding, bolt structure, plug-in structure, tenon and mortise structure, magnetic attraction structure, etc.

[0058] Among them, the fixed seat 110 and the frame are integrally formed, which simplifies the assembly process of the two and is beneficial to saving the manufacturing cost of the whole machine.

[0059] As shown in Figure 4 , Figure 6 , Figure 7 and Figure 8 shown, in some possible implementation embodiments provided by the present invention, a guide rail 123 is provided or formed on one of the sliding seat 120 and the fixed seat 110, and a guiding member 112 is provided or formed on the other. The guiding member 112 and the guide rail 123 are movably connected, so that the sliding seat 120 can slide relative to the fixed seat 110.

[0060] In this embodiment, the arrangement of the guide rail 123 and the guiding member 112 plays a good guiding role in the movement of the sliding seat 120 relative to the fixed seat 110. Therefore, it can reduce the jumping and shaking during the sliding process of the sliding seat 120 relative to the fixed seat 110, reduce the possibility of the synchronous belt 210 shaking or jumping, improve the smoothness of the movement of the synchronous belt 210, and reduce the possibility of the synchronous belt 210 touching the two side edges of the tensioning wheel 130, which is beneficial to improving the service life of the synchronous belt 210.

[0061] Among them, the guide rail 123 can be located on the sliding seat 120, and the guiding member 112 can be located on the fixed seat 110. For example, if the guide rail 123 and the sliding seat 120 are of a split structure, the guide rail 123 is installed on the sliding seat 120, or if the guide rail 123 and the sliding seat 120 are of an integral structure, the guide rail 123 is formed on the sliding seat 120. Or, if the guiding member 112 and the fixed seat 110 are of a split structure, the guiding member 112 is installed on the fixed seat 110, or if the guiding member 112 and the fixed seat 110 are of an integral structure, the guiding member 112 is formed on the fixed seat 110.

[0062] In another example, the guiding member 112 can be located on the sliding seat 120, and the guide rail 123 can be located on the fixed seat 110. For example, if the guiding member 112 and the sliding seat 120 are of a split structure, the guiding member 112 is installed on the sliding seat 120, or if the guiding member 112 and the sliding seat 120 are of an integral structure, the guiding member 112 is formed on the sliding seat 120. Or, if the guide rail 123 and the fixed seat 110 are of a split structure, the guide rail 123 is installed on the fixed seat 110, or if the guide rail 123 and the fixed seat 110 are of an integral structure, the guide rail 123 is formed on the fixed seat 110.

[0063] In the above examples, the guide rail 123 can be a guide block, a guide post, a guiding protrusion, etc. For example Figure 7 and Figure 8 As shown, the guide rail 123 is formed on the sliding seat 120, and the guiding member 112 is formed on the fixed seat 110.

[0064] In some possible embodiments provided by the present utility model, the elastic member 140 is in a compressed state. The first end of the elastic member 140 is relatively fixed to the fixed seat 110. For example, the first end of the elastic member 140 is directly connected to the fixed seat 110, or the first end of the elastic member 140 is indirectly connected to the fixed seat 110 through other structures. The second end of the elastic member 140 is connected to the sliding seat 120. The elastic member 140 is a spring, a spring sheet, or an elastic glue. Thus, the spring, the spring sheet, or the elastic glue can stably provide an elastic force to the sliding seat 120, so that the sliding seat 120 moves relative to the fixed seat 110 to a proper position under the action of the elastic member 140 and the synchronous belt 210, so that the tensioning wheel 130 provides a tensioning force to the synchronous belt 210 to achieve the tensioning operation of the synchronous belt 210. Specifically, the elastic glue can include urethane rubber, spring glue, polyurethane rod, etc.

[0065] In some possible embodiments provided by the present utility model, the elastic member 140 is in a stretched state, and the elastic member 140 is a tension spring. The first end of the tension spring is relatively fixed to the fixed seat 110. For example, the first end of the tension spring is directly connected to the fixed seat 110, or the first end of the tension spring is indirectly connected to the fixed seat 110 through other structures. The second end of the tension spring is connected to the sliding seat 120. Thus, the tension spring can stably provide an elastic force to the sliding seat 120, so that the sliding seat 120 moves to a suitable position relative to the fixed seat 110 under the action of the tension spring and the synchronous belt 210, so that the tension pulley 130 provides a tension force to the synchronous belt 210 to realize the tensioning operation of the synchronous belt 210.

[0066] In some possible embodiments provided by the present utility model, the elastic member 140 is in a torsional state, and the elastic member 140 is a torsion spring. The first torsion arm of the torsion spring is connected or abutted to the fixed seat 110, and the second torsion arm of the torsion spring is connected or abutted to the sliding seat 120. Thus, the torsion spring can stably provide an elastic force to the sliding seat 120, so that the sliding seat 120 moves to a suitable position relative to the fixed seat 110 under the action of the torsion spring and the synchronous belt 210, so that the tension pulley 130 provides a tension force to the synchronous belt 210 to realize the tensioning operation of the synchronous belt 210.

[0067] Such as Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown in

[0068] In some possible embodiments provided by the present utility model, the tensioning device 100 further includes: a connection cover 160, the connection cover 160 is detachably connected to the fixed seat 110, the elastic member 140 is a spring, and the first end of the spring is connected to the connection cover 160. The setting of the connection cover 160 enables the first end of the spring to be indirectly connected to the fixed seat 110 through the connection cover 160, which facilitates the disassembly and assembly of the elastic member 140, and further facilitates the maintenance of the elastic member 140. At the same time, the connection cover 160 can play a good role in covering and decorating the fixed seat 110 to improve the cleanliness and aesthetics of the appearance of the fixed seat 110.

[0069] Such as Figure 2 , Figure 5 , Figure 6 and Figure 7As shown, in some possible embodiments provided by the present utility model, the fixed seat 110 is provided with a first installation space 113 and a channel 114. The first end of the channel 114 communicates with the first installation space 113, and the second end of the channel 114 penetrates through the fixed seat 110 along the sliding direction of the sliding seat 120 relative to the fixed seat 110. The first installation space 113 is used to accommodate the sliding seat 120. The connecting cover 160 is located outside the fixed seat 110 and is used to cover the second end of the channel 114. The second end of the spring passes through the channel 114 and is connected to the sliding seat 120. Thus, the connection between the spring and the fixed seat 110 and the sliding seat 120 is realized, with a simple structure and convenient disassembly and assembly. At the same time, the setting of the channel 114 plays a good limiting role in the telescopic direction of the spring, which can further reduce the possibility of the sliding seat 120 shaking and jumping relative to the fixed seat 110, reduce the possibility of the synchronous belt 210 shaking or jumping, improve the smoothness of the movement of the synchronous belt 210, and reduce the possibility of the synchronous belt 210 touching the two side edges of the tensioning wheel 130, which is beneficial to improving the service life of the synchronous belt 210.

[0070] Among them, covering the second end of the channel 114 with the connecting cover 160 is beneficial to improving the cleanliness and aesthetics of the appearance of the fixed seat.

[0071] As Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, in some possible embodiments provided by the present utility model, the sliding seat 120 is provided with an accommodation space 124 for accommodating the tensioning wheel 130. The tensioning device 100 further includes a first rotating shaft 170. The first rotating shaft 170 is connected to the sliding seat 120 and penetrates through the accommodation space 124. The tensioning wheel 130 is rotatably connected to the first rotating shaft 170, so that the tensioning wheel 130 is rotatably installed on the sliding seat 120. Specifically, the first rotating shaft 170 can be a connecting shaft, a pin shaft, etc. Specifically, a first installation hole 126 is provided on the sliding seat 120, and the first rotating shaft 170 penetrates through the first installation hole 126 and is installed on the sliding seat 120.

[0072] Among them, a connection hole 125 is provided on one side of the sliding seat 120 facing the channel 114. The second end of the spring is connected to the sliding seat 120 through the connection hole 125, which is convenient for disassembly and assembly. Specifically, hooks can be provided on the hole wall of the connection hole 125, and the second end of the spring can be hooked on the hooks to realize the connection with the sliding seat 120.

[0073] Such as 1 to Figure 8As shown in the figure, an embodiment of the second aspect of the present utility model provides a belt drive device 200, which is applied to a stereolithography apparatus. The belt drive device 200 includes: a synchronous belt 210; and a tensioning device 100 of any one of the embodiments in the first aspect. Since the belt drive device 200 includes the tensioning device 100 of any one of the embodiments in the first aspect, it has all the technical effects of the aforementioned tensioning device 100, which will not be elaborated here one by one.

[0074] As Figure 1 and Figure 2 shown, in some possible embodiments provided by the present utility model, the synchronous belt 210 corresponds to the tensioning device 100, that is, one synchronous belt 210 corresponds to one tensioning device 100, so as to use the tensioning device 100 to perform a tensioning operation on the corresponding synchronous belt 210.

[0075] Among them, the number of the synchronous belts 210 and the tensioning devices 100 is one or more and the numbers are equal. For example, the number of the synchronous belts 210 can be one, two, three, or four. One synchronous belt 210 is connected to one driven part to drive the corresponding driven part to move in the XY plane. Thus, the number of the synchronous belts 210 can be reasonably set to drive different numbers of belt-driven parts 222 to move in the XY plane to meet the requirements of different structures of the belt drive device 200, and the application range is wide.

[0076] In the above embodiment, when the number of the synchronous belts 210 is multiple, the number of the tensioning devices 100 is equal to the number of the synchronous belts 210 to perform a tensioning operation on the corresponding synchronous belts 210. Among them, the multiple synchronous belts 210 are arranged at intervals along the axial direction of the tensioning pulley 130 of the tensioning device 100. The axial direction of the tensioning pulley 130 is as Figure 3 and Figure 5 shown by the arrow Z in the figure, that is to say, the multiple synchronous belts 210 are spaced apart at different heights parallel to the XY plane, so that the movements of the multiple synchronous belts 210 do not interfere with each other, and the movements of different driven parts in different planes parallel to the XY plane can be realized.

[0077] In some possible embodiments provided by the present utility model, the fixed seats 110 of two adjacent tensioning devices 100 among the multiple tensioning devices 100 are detachably connected or integrated into an integral structure.

[0078] In this embodiment, by connecting the fixed seats 110 of two adjacent tensioning devices 100, the structural layout of the entire belt transmission device 200 is made compact, meeting the design requirements of a compact structure and small volume for the belt transmission device 200. Meanwhile, the three-dimensional forming device further includes a base. With this arrangement, by connecting one of the connected fixed seats 110 to the base of the three-dimensional forming device, the fixed connection of multiple fixed seats 110 to the base can be achieved. Compared with individually connecting each fixed seat 110 to the base, the disassembly and assembly arrangement is simplified, which is conducive to improving the disassembly and assembly efficiency of the three-dimensional forming device, and is also conducive to improving production efficiency and maintenance efficiency.

[0079] Among them, the fixed seats 110 of two adjacent tensioning devices 100 can be detachably connected through at least one of a bolt structure, a clamping structure, a plugging structure, a mortise and tenon structure, and a magnetic attraction mechanism. With this setting, when one of the fixed seats 110 fails, the two can be disassembled and separated for maintenance, which is conducive to reducing the cost of replacing parts.

[0080] Among them, the fixed seats 110 of two adjacent tensioning devices 100 can be of an integral structure. In this way, it is convenient for processing, easy for production, and simplifies the connection and assembly steps of two adjacent fixed seats 110. It can be understood that part of the two adjacent fixed seats 110 can also be set as an integral structure, and the other part can be set as a split structure.

[0081] As Figure 1 and Figure 2 shown, in some possible embodiments provided by the present utility model, the belt transmission device 200 further includes: a driving part 220 and an idler pulley 230. The driving part 220 and the idler pulley 230 are installed on the frame of the three-dimensional forming device. The driving part 220 includes a synchronous pulley 221. The synchronous belt 210 is sleeved and connected to the synchronous pulley 221, the idler pulley 230, and the tensioning pulley 130 of the tensioning device 100. Thus, the driving of the synchronous belt 210 is realized, and the synchronous belt 210 is connected to the tensioning device 100.

[0082] Furthermore, as Figure 3 , Figure 4 , Figure 5 and Figure 6 shown, the driving part 220 further includes a driving member 222. The driving member 222 is connected to the synchronous pulley 221 to drive the synchronous pulley 221 to rotate. Specifically, the driving member 222 can be a motor.

[0083] Among them, the driving part 220 and the idle pulley 230 are installed on the frame of the three-dimensional forming device. The frame of the three-dimensional forming device provides an installation space and an installation position for the driving part 220 and the idle pulley 230, simplifies the setting of the installation structure of the driving part 220 and the idle pulley 230, and can meet the design requirements of the belt transmission device 200 with a compact structure and a small volume.

[0084] Further, as Figure 3 , Figure 4 , Figure 5 and Figure 6 shown, the belt transmission device 200 further includes a second connecting member 250. The driving part 220 is installed on the frame of the three-dimensional forming device through the second connecting member 250. If the second connecting member 250 is a bolt and the driving member 222 of the driving part 220 is a motor, the motor is installed on the frame of the three-dimensional forming device through the bolt.

[0085] In some possible embodiments provided by the present utility model, the frame of the three-dimensional forming device is provided with a second installation space 115 for accommodating the idle pulley 230. The belt tensioning device 100 further includes a second rotating shaft 240. The second rotating shaft 240 is connected to the fixed seat 110 and passes through the second installation space 115. The idle pulley 230 is rotatably connected to the second rotating shaft 240. Thus, the idle pulley 230 is rotatably installed on the frame. Specifically, the second rotating shaft 240 can be a connecting shaft, a pin shaft, etc. Specifically, the frame of the three-dimensional forming device is provided with a second installation hole communicating with the second installation space 115, and the second rotating shaft 240 passes through the second installation hole and is installed on the frame.

[0086] Among them, the first installation space 113 and the channel 114 of the fixed seat 110 are located on both sides of the second installation space 115. This kind of setting makes the tensioning pulley 130 on the sliding seat 120 accommodated in the first installation space 113, the idle pulley 230 in the second installation space 115, and the elastic member 140 in the channel 114 be approximately in the same height range in the vertical direction, so as to reduce the possibility of the synchronous belt 210 jumping or shaking and improve the smoothness of the movement of the synchronous belt 210. It can be understood that in some examples, as Figure 6 shown, the frame and the fixed seat 110 can be an integrally formed structure, or the frame and the fixed seat 110 can be fixedly connected.

[0087] As Figure 1 and Figure 2As shown in the figure, an embodiment of the third aspect of the present utility model provides a three-dimensional forming device, including: a component to be driven, and the belt transmission device 200 of any one of the embodiments in the second aspect. The component to be driven is driven to move by a synchronous belt 210. Since the three-dimensional forming device includes the belt transmission device 200 of any one of the foregoing embodiments, it has all the technical effects of the foregoing belt transmission device 200, which will not be elaborated herein one by one.

[0088] In some possible embodiments provided by the present utility model, the three-dimensional forming device further includes: a frame. The fixed seat 110 of the belt transmission device 200 is installed on the frame. The belt transmission device 200 drives the component to be driven to move relative to the frame. Specifically, the belt transmission device 200 drives the component to be driven to move relative to the frame in the XY plane.

[0089] Wherein, the number of components to be driven can be one, two, three, or other numbers. The component to be driven includes at least one of a printing platform and a print head. Alternatively, the component to be driven can also include other structures.

[0090] For example, when the number of components to be driven is one and the component to be driven includes a printing platform or a print head, there is one synchronous belt 210 of the belt transmission device 200, and the number of tensioning devices 100 is one, so as to realize the movement of the printing platform or the print head relative to the frame in the XY plane.

[0091] As Figure 1 shown, when the number of components to be driven is two and the components to be driven include a printing platform and a print head, there are two synchronous belts 210 of the belt transmission device 200, and the number of tensioning devices 100 is two. The two synchronous belts 210 respectively realize the movement of the printing platform and the print head relative to the frame in the XY plane.

[0092] Wherein, in this case, the frame can be formed with two second installation spaces 115 in the vertical direction. The vertical direction can be as shown by the arrow Z in Figure 3 and Figure 5 . The two second installation spaces 115 are used to respectively accommodate the idler pulleys 230 of the two belt transmission devices 200.

[0093] Specifically, as Figures 1 to 8 shown, the present utility model further provides the following implementation manners:

[0094] Reference numeral 1. A tensioning device 100 for tensioning a timing belt 210, the tensioning device 100 comprising: a fixed seat 110; a sliding seat 120 slidably connected to the fixed seat 110, a tensioning wheel 130 rotatably connected to the sliding seat 120 and configured to wind the timing belt 210; an elastic member 140 having two ends respectively connected to the sliding seat 120 and the fixed seat 110, the elastic member 140 being in an energy storage state to cause the sliding seat 120 to slide relative to the fixed seat 110 so as to tension the timing belt 210; a limiting assembly 150 including a locking member 151 and a limiting structure 152, the limiting structure 152 being located on the surfaces of the fixed seat 110 and the sliding seat 120 in contact with each other to limit the direction of relative movement between the fixed seat 110 and the sliding seat 120, and the locking member 151 being configured to connect the fixed seat 110 and the sliding seat 120 to limit the relative movement between the fixed seat 110 and the sliding seat 120.

[0095] Reference numeral 2. According to the tensioning device 100 of reference numeral 1, the number of the locking members 151 is one, the limiting structure 152 is arranged as a one-way limiting structure 152, and the limiting direction of the limiting structure 152 is the direction of loosening the timing belt 210.

[0096] Reference numeral 3. According to the tensioning device 100 of reference numeral 1 or 2, the sliding direction of the sliding seat 120 relative to the fixed seat 110 includes a first direction and a second direction. The elastic member 140 releases elastic potential energy to drive the sliding seat 120 to slide relative to the fixed seat 110 along the first direction, the second direction is opposite to the first direction, and the limiting structure 152 is configured to limit the movement of the sliding seat 120 relative to the fixed seat 110 along the second direction.

[0097] Reference numeral 4. According to the tensioning device 100 of reference numeral 3, the limiting structure 152 is provided on at least one side of the locking member 151. The limiting structure 152 includes a first limiting portion 122 provided on the sliding seat 120 and a second limiting portion 116 provided on the fixed seat 110. The first limiting portion 122 includes a plurality of first teeth, and the second limiting portion 116 includes a plurality of second teeth matching the first teeth.

[0098] Reference numeral 5. According to the tensioning device 100 of reference numeral 1, the fixed seat 110 is provided with an adjustment hole 111 extending along the movement direction of the sliding seat 120 and the fixed seat 110. The sliding seat 120 is provided with a limiting hole 121. The locking member 151 passes through the adjustment hole 111 and is connected to the limiting hole 121 to lock and fix the sliding seat 120 and the fixed seat 110. The tensioning device 100 is applied to a three-dimensional forming device, and the three-dimensional forming device includes a frame. The fixed seat 110 is fixedly connected to the frame or integrally formed with the frame.

[0099] Reference numeral 6. For the tensioning device 100 according to reference numeral 1, a guide rail 123 is provided or formed on one of the sliding seat 120 and the fixed seat 110, and a guide member 112 is provided or formed on the other. The guide member 112 is movably connected to the guide rail 123 so that the sliding seat 120 can slide relative to the fixed seat 110.

[0100] Reference numeral 7. For the tensioning device 100 according to reference numeral 1, the elastic member 140 is in a compressed state. The first end of the elastic member 140 is fixedly opposed to the fixed seat 110, and the second end of the elastic member 140 is connected to the sliding seat 120. The elastic member 140 is a spring, a spring sheet, or an elastic adhesive; or the elastic member 140 is in a stretched state, and the elastic member 140 is a tension spring. The first end of the tension spring is fixedly opposed to the fixed seat 110, and the second end of the tension spring is connected to the sliding seat 120; or the elastic member 140 is in a torsional state, and the elastic member 140 is a torsion spring. The first torsion arm of the torsion spring is connected to or abuts against the fixed seat 110, and the second torsion arm of the torsion spring is connected to or abuts against the sliding seat 120.

[0101] Reference numeral 8. For the tensioning device 100 according to reference numeral 7, further comprising: a connection cover 160. The connection cover 160 is detachably connected to the fixed seat 110. The elastic member 140 is a spring, and the first end of the spring is connected to the connection cover 160.

[0102] Reference numeral 9. For the tensioning device 100 according to reference numeral 8, the fixed seat 110 is provided with a first installation space 113 and a channel 114. The first end of the channel 114 communicates with the first installation space 113, and the second end of the channel 114 penetrates through the fixed seat 110 along the sliding direction of the sliding seat 120 relative to the fixed seat 110. The first installation space 113 is used to accommodate the sliding seat 120. The connection cover 160 is located outside the fixed seat 110 and is used to cover the second end of the channel 114. The second end of the spring passes through the channel 114 and is connected to the sliding seat 120.

[0103] Reference numeral 10. For the tensioning device 100 according to reference numeral 9, the sliding seat 120 is provided with an accommodation space 124 for accommodating the tensioning wheel 130. One side of the sliding seat 120 facing the channel 114 is provided with a connection hole 125 for connecting the second end of the spring; the tensioning device 100 further comprises a first rotating shaft 170. The first rotating shaft 170 is connected to the sliding seat 120 and passes through the accommodation space 124, and the tensioning wheel 130 is rotatably connected to the first rotating shaft 170.

[0104] Specifically, as Figures 1 to 8 shown, the present utility model further provides the following embodiments:

[0105] Reference numeral 11. A belt transmission device 200 is applied to a three-dimensional forming device. The belt transmission device 200 includes: a synchronous belt 210; and a tensioning device 100 according to any one of reference numerals 1 to 10.

[0106] Reference numeral 12. Belt drive 200 according to reference numeral 11, the synchronous belt 210 corresponds to the tensioning device 100, the number of the synchronous belt 210 and the tensioning device 100 is one or more and the numbers are equal, and a plurality of synchronous belts 210 are arranged at intervals along the axial direction of the tensioning pulley 130 of the tensioning device 100.

[0107] Reference numeral 13. Belt drive 200 according to reference numeral 12, the fixed seats 110 of two adjacent tensioning devices 100 among a plurality of tensioning devices 100 are detachably connected or integrated into an integral structure.

[0108] Reference numeral 14. Belt drive 200 according to reference numeral 11, further comprising: a driving part 220 and an idler pulley 230, the driving part 220 and the idler pulley 230 are installed on the frame of the three-dimensional forming device, the driving part 220 includes a synchronous pulley 221, and the synchronous belt 210 is sleeved and connected to the synchronous pulley 221, the idler pulley 230, and the tensioning pulley 130 of the tensioning device 100.

[0109] Reference numeral 15. Belt drive 200 according to reference numeral 14, the frame is provided with a second installation space 115 for accommodating the idler pulley 230, and the first installation space 113 and the channel 114 of the fixed seat 110 are located on both sides of the second installation space 115;

[0110] The belt tensioning device 100 further includes a second rotating shaft 240, the second rotating shaft 240 is connected to the frame and passes through the second installation space 115, and the idler pulley 230 is rotatably connected to the second rotating shaft 240.

[0111] Specifically, as Figures 1 to 8 shown, the present invention further provides the following embodiments:

[0112] Reference numeral 16. A three-dimensional forming device, comprising: a part to be driven, and a belt drive 200 according to any one of reference numerals 11 to 15, and the part to be driven is driven to move by a belt.

[0113] Reference numeral 17. The three-dimensional forming device according to reference numeral 16, further comprising: a frame, the fixed seat 110 of the belt drive 200 is installed on the frame, and the belt drive 200 drives the part to be driven to move relative to the frame; the number of the parts to be driven is at least one, and the part to be driven includes at least one of a printing platform and a print head.

[0114] In the description of the present utility model, the term "a plurality of" refers to two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0115] For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0116] In the description of the present utility model, the term "a plurality of" refers to two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0117] For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tensioning device for tensioning a synchronous belt, characterized in that: The tensioning device comprises: Fixed seat; A slide seat, wherein the slide seat is slidably connected to the fixed seat, and a tensioning wheel rotatably connected to the slide seat is provided on the slide seat, and the tensioning wheel is used to wind the synchronous belt; An elastic member, two ends of which are respectively connected to the slide seat and the fixed seat, and the elastic member is in an energy storage state so as to enable the slide seat to slide relative to the fixed seat to tighten the synchronous belt; A limit assembly, the limit assembly includes a locking member and a limiting structure, the limiting structure is located on the surface where the fixed seat and the sliding seat contact each other to limit the direction of relative movement of the fixed seat and the sliding seat, and the locking member is used to connect the fixed seat and the sliding seat to limit the relative movement of the fixed seat and the sliding seat.

2. The tensioning device according to claim 1, characterized in that: The number of the locking member is one, the limiting structure is configured as a unidirectional limiting structure, and the limiting direction of the limiting structure is the direction of loosening the synchronous belt.

3. The tensioning device according to claim 1 or 2, characterized in that: The sliding direction of the sliding seat relative to the fixed seat includes a first direction and a second direction. The elastic member releases elastic potential energy to drive the sliding seat to slide relative to the fixed seat along the first direction, and the second direction is opposite to the first direction. The limiting structure is used to limit the movement of the sliding seat relative to the fixed seat along the second direction.

4. The tensioning device according to claim 3, characterized in that: The limiting structure is provided on at least one side of the locking member, and the limiting structure includes a first limiting portion provided on the sliding seat, and a second limiting portion provided on the fixed seat, the first limiting portion includes a plurality of first teeth, and the second limiting portion includes a plurality of second teeth matching the first teeth.

5. The tensioning device according to claim 1, characterized in that: The fixing seat is provided with an adjustment hole extending along the movement direction of the sliding seat and the fixing seat, the sliding seat is provided with a limit hole, the locking member is passed through the adjustment hole and connected with the limit hole to lock and fix the sliding seat and the fixing seat; The tensioning device is applied to a three-dimensional forming device, wherein the three-dimensional forming device comprises a frame, and the fixing seat is fixedly connected to the frame, or the fixing seat and the frame are integrally formed.

6. The tensioning device according to claim 1, characterized in that: A guide rail is arranged or formed on one of the sliding seat and a guide piece is arranged or formed on the other one. The guide piece and the guide rail are movably connected so that the sliding seat can slide relative to the fixed seat.

7. The tensioning device according to claim 1, characterized in that: The elastic member is in a compressed state, the first end of the elastic member is relatively fixed to the fixing seat, the second end of the elastic member is connected to the sliding seat, and the elastic member is a spring, a spring sheet, or an elastic rubber; or The elastic member is in a stretched state, the elastic member is a tension spring, a first end of the tension spring is relatively fixed to the fixing seat, and a second end of the tension spring is connected to the sliding seat; or The elastic member is in a torsion state, the elastic member is a torsion spring, the first torsion arm of the torsion spring is connected to or abuts against the fixing seat, and the second torsion arm of the torsion spring is connected to or abuts against the sliding seat.

8. The tensioning device according to claim 7, characterized in that: Also includes: A connecting cover is detachably connected to the fixing seat, the elastic member is a spring, and a first end of the spring is connected to the connecting cover.

9. The tensioning device according to claim 8, characterized in that: The fixing seat is provided with a first installation space and a channel, the first end of the channel is communicated with the first installation space, the second end of the channel passes through the fixing seat along the sliding direction of the slide relative to the fixing seat, the first installation space is used to accommodate the slide, the connecting cover is located outside the fixing seat and is used to cover the second end of the channel, and the second end of the spring passes through the channel and is connected to the slide.

10. The tensioning device according to claim 9, characterized in that: The slide seat is provided with a receiving space for receiving the tensioning wheel, and the slide seat is provided with a connecting hole for connecting the second end of the spring on one side facing the channel; The tensioning device further comprises a first rotating shaft, the first rotating shaft is connected to the sliding seat and penetrates the accommodating space, and the tensioning wheel is rotatably connected to the first rotating shaft.

11. A belt transmission device, characterized in that: Applied to stereoscopic molding equipment, the belt transmission device comprises: A timing belt; and a tensioning device as claimed in any one of claims 1 to 10.

12. The belt transmission device according to claim 11, characterized in that: The synchronous belt corresponds to the tensioning device, the number of the synchronous belt and the tensioning device are one or more and the number is equal, and the multiple synchronous belts are arranged at intervals along the axial direction of the tensioning wheel of the tensioning device.

13. The belt transmission device according to claim 12, characterized in that: The fixing seats of two adjacent tensioning devices among the plurality of tensioning devices can be detachably connected or integrated into an integral structure.

14. The belt transmission device according to claim 11, characterized in that: Also includes: A driving part and an idler wheel are installed on the frame of the three-dimensional forming equipment. The driving part includes a synchronous wheel. The synchronous belt is sleeved and connected to the synchronous wheel, the idler wheel and the tensioning wheel of the tensioning device.

15. The belt transmission device according to claim 14, characterized in that: The frame is provided with a second installation space, the second installation space is used to accommodate the idler wheel, and the first installation space and the channel of the fixing seat are located on both sides of the second installation space; The belt tensioning device further includes a second rotating shaft, which is connected to the frame and penetrates the second installation space, and the idler wheel is rotatably connected to the second rotating shaft.

16. A three-dimensional forming device, characterized in that: include: A driven member, and a belt transmission device according to any one of claims 11 to 15, wherein the driven member is driven to move by the belt.

17. The three-dimensional forming device according to claim 16, characterized in that: Also includes: A frame, a fixing seat of the belt transmission device is installed on the frame, and the belt transmission device drives the driven member to move relative to the frame; The number of the components to be driven is at least one, and the components to be driven include at least one of a printing platform and a printing head.

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