Tensioning assembly, displacement driving assembly and 3D printing equipment

Abstract

The utility model relates to the technical field of 3D printing, aims to solve the technical problem that the tension adjusting precision of some known tensioning assemblies is not high, and provides a tensioning assembly, a displacement driving assembly and 3D printing equipment. The tensioning assembly comprises a transmission wheel assembly, a basic part, a driving assembly, a deformation part and a detection part. The driving wheel assembly is used for supporting the driving belt to tension the driving belt. The driving assembly is in transmission connection with the transmission wheel assembly and used for driving the transmission wheel assembly to move so as to tension or loosen the transmission belt. The deformation part comprises a fixing part and a suspension part, the fixing part is fixedly connected to the basic part, the suspension part is connected to one side of the fixing part and connected with the driving assembly or the transmission wheel assembly, the suspension part is suspended relative to the basic part, and the suspension part is constructed to move relative to the fixing part when the driving assembly drives the transmission wheel assembly to tension the transmission belt. Therefore, the deformation part deforms. The detection part is used for detecting deformation generated by the deformation part. The tensioning force adjusting device has the beneficial effect that the adjusting precision of the tensioning force is improved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and more specifically, to a tensioning assembly, a displacement drive assembly, and a 3D printing device. Background Art

[0002] Some transmission belts require tensioning via an idler pulley to ensure stable operation. Conventional technologies use sensors to detect belt tension and then adjust the position of the idler pulley based on the detected tension to adjust the tension. However, some sensors have low tension detection accuracy, resulting in large errors and limited tension adjustment precision. Utility Model Content

[0003] The present application provides a tensioning assembly, a displacement drive assembly and a 3D printing device to solve the technical problem that the tensioning force adjustment accuracy of some known tensioning assemblies is not high.

[0004] The present application provides a tensioning assembly, which includes a transmission wheel assembly, the transmission wheel assembly is used to support a transmission belt to tension the transmission belt, and the tensioning assembly also includes a base member, a drive assembly, a deformation member and a detection member. The drive assembly is transmission-connected to the transmission wheel assembly and is used to drive the transmission wheel assembly to move to tension or loosen the transmission belt. The deformation member includes a fixed portion and a suspension portion, the fixed portion is fixedly connected to the base member, the suspension portion is connected to one side of the fixed portion and is connected to the drive assembly or the transmission wheel assembly, the suspension portion is suspended relative to the base member, and the suspension portion is constructed to be able to displace relative to the fixed portion when the drive assembly drives the transmission wheel assembly to tension the transmission belt, so that the deformation member is deformed. The detection member is used to detect the deformation generated by the deformation member.

[0005] The tension of the transmission belt can be directly transmitted to the transmission wheel assembly, and then to the drive assembly through the transmission wheel assembly. This allows the tension of the transmission belt to be transmitted to the suspension portion only through a relatively small number of components, resulting in less distortion of the tension applied to the suspension portion and lower detection errors compared to detection elements in some known technologies. Furthermore, because the fixed portion of the deformable member remains fixed to the base member, the suspension portion is suspended relative to the base member. When the suspension portion is subjected to the tension, it will slightly displace relative to the fixed portion, causing the deformable member to deform. Because the deformable member is suspended relative to the base member, it can produce a significant deformation even under a relatively small tension. This amplifies the tension. The deformation of the deformable member is then detected by the detection member, and the tension can be calculated based on the deformation of the deformable member. Thus, the tension assembly of this embodiment can improve the detection of transmission belt tension, reduce tension detection errors, and increase the accuracy of tension adjustment for the transmission belt.

[0006] In some embodiments:

[0007] The driving assembly includes a driving member, which includes a main body and a movable shaft. The main body and the suspension part are fixedly connected. One end of the movable shaft is movably connected to the main body, and the other end of the movable shaft is connected to the transmission wheel assembly. The suspension part is connected to the main body.

[0008] In some embodiments:

[0009] The deformable member further includes a connecting portion connected between the suspension portion and the fixing portion.

[0010] In some embodiments:

[0011] The connecting portion defines a first space; and / or, a second space is defined between the connecting portion and the fixing portion; and / or, a third space is defined between the connecting portion and the suspension portion.

[0012] In some embodiments:

[0013] The fixing portion includes a first connecting segment and a second connecting segment, the first connecting segment is connected to the base member, the second connecting segment is connected to the first connecting segment and extends toward the suspension portion, the connecting portion is connected between the first connecting segment and the suspension portion, and the second space is defined between the connecting portion and the second connecting segment.

[0014] In some embodiments:

[0015] The suspension portion includes a third connecting segment and a fourth connecting segment, the third connecting segment is spaced apart from the fixed portion, the fourth connecting segment is connected to the third connecting segment and extends toward the fixed portion, the connecting portion is connected between the third connecting segment and the fixed portion, and the third space is defined between the connecting portion and the fourth connecting segment.

[0016] In some embodiments:

[0017] The deformable member is made of a conductive material, and the resistance of the deformable member is configured to change when the deformable member is deformed. The detecting member is electrically connected to the deformable member and is configured to detect the resistance of the deformable member.

[0018] In some embodiments:

[0019] The detection member includes a detection chip; the deformable member also includes a connecting portion, the connecting portion is connected between the suspension portion and the fixed portion, the detection chip is provided in the connecting portion, and is configured to detect the resistance of the deformable member.

[0020] The present application also provides a displacement drive assembly comprising a rotary motor, a transmission belt, and the aforementioned tensioning assembly. The transmission belt is coupled to the rotary motor and is driven by the rotary motor. The transmission wheel assembly of the tensioning assembly is supported by the transmission belt and is used to tension the transmission belt.

[0021] The present application provides a 3D printing device, comprising a frame and the aforementioned displacement drive assembly. The displacement drive assembly is mounted on the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a 3D printing device according to an embodiment of the present application.

[0024] Figure 2 Schematic diagram of the structure of a displacement drive assembly according to an embodiment of the present application.

[0025] Figure 3 Schematic diagram of the structure of the displacement drive assembly according to one embodiment of the present application from another perspective.

[0026] Figure 4 Schematic diagram of the exploded structure of a displacement drive assembly according to an embodiment of the present application.

[0027] Figure 5 for Figure 4 Schematic diagram of the locally enlarged structure in .

[0028] Figure 6 This is a top view of the displacement drive assembly of one embodiment of the present application with the base member removed.

[0029] Figure 7 This is a top view of a displacement drive assembly according to an embodiment of the present application.

[0030] Figure 8 This is a schematic diagram of the exploded structure of the displacement drive assembly according to one embodiment of the present application from another perspective.

[0031] Figure 9 This is a schematic diagram of the partial structure of a tensioning assembly according to an embodiment of the present application.

[0032] Figure 10 This is a schematic diagram of a partial exploded structure of a tensioning assembly according to one embodiment of the present application.

[0033] Figure 11 This is a schematic structural diagram of a deformable member and a detection member according to an embodiment of the present application.

[0034] Figure 12 This is a schematic structural diagram of a deformable member and a detection member according to another embodiment of the present application.

[0035] Description of main component symbols:

[0036]

[0037]

[0038] DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered therein. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an element centered therein. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be an element centered therein. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the relevant listed items.

[0042] Those skilled in the art will understand that "tensioning" refers to maintaining appropriate tension in the belt and chain transmission system during transmission, thereby preventing the belt from slipping or the timing belt from jumping or stripping teeth and dragging. Alternatively, it prevents the chain from loosening or falling off, and reduces wear on the sprocket and chain.

[0043] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0044] See also Figure 1This embodiment provides a 3D printing device 300, for example, a 3D printing device 300 based on FDM technology.

[0045] The 3D printing device 300 includes a base 306 , a molding platform 307 , a frame 301 , a print head 305 assembly, and a displacement drive assembly 200 .

[0046] The frame 301 is fixedly connected to the base 306. The displacement drive assembly 200 can be used as any of the X-axis displacement drive assembly, the Y-axis displacement drive assembly, and the Z-axis displacement drive assembly. The Z-axis displacement drive assembly is connected to the frame 301, the X-axis displacement drive assembly is connected to the Z-axis drive assembly 304, the print head 305 is connected to the X-axis drive assembly 302, and the Y-axis drive assembly 303 is connected to the base 306 and connected to the build platform 307.

[0047] In this way, relative displacements can occur between the print head 305 and the building platform 307 in the first direction X, the second direction Y, and the third direction Z, so that the print head 305 can print a three-dimensional printed part on the building platform 307 .

[0048] In other embodiments, the movable directions of the build platform 307 and the print head 305 may also be other forms, which are not limited here. For example, a Z-axis displacement drive assembly may be provided on the base 306 and connected to the build platform 307. The print head 305 is connected to the frame 301 via a bidirectional drive structure in a first direction X and a second direction Y, comprising an X-axis drive assembly 302 and a Y-axis drive assembly 303.

[0049] In this embodiment, see Figure 2 and Figure 3 The displacement drive assembly 200 includes a rotary motor 201, a driving pulley 202, and a transmission belt 203. The rotary motor 201 is connected to the driving pulley 202. The transmission belt 203 is wound around the driving pulley 202. The rotary motor 201 drives the driving pulley 202 to rotate, thereby driving the transmission belt 203. The transmission belt 203 can be a synchronous belt, which is driven by the rotary motor 201 through the driving pulley 202 to circulate.

[0050] In some embodiments, the displacement drive assembly 200 further includes an idler assembly 204 . The idler assembly 204 is spaced apart from the driving wheel 202 , and the transmission belt 203 is further wound around the idler assembly 204 .

[0051] The displacement drive assembly 200 in this embodiment further includes a tensioning assembly 100 for tensioning the transmission belt 203 when needed.

[0052] See also Figure 2The tensioning assembly 100 includes a transmission wheel assembly 10, a base member 20, a drive assembly 30, a deformable member 40, and a detection member 50. The transmission wheel assembly 10 is movably mounted on the base member 20. The transmission wheel assembly 10 supports the transmission belt 203 to tension the transmission belt 203. In this embodiment, the rotating motor 201, the driving wheel 202, and the transmission belt 203 are all mounted on the base member 20. The base member 20 can be mounted as a fixed structure on the frame 301 or the base 306.

[0053] The drive assembly 30 is in driving connection with the transmission wheel assembly 10 and is used to drive the transmission wheel assembly 10 to move along the displacement direction M to tighten or loosen the transmission belt 203. The deformable member 40 includes a fixed portion 41 and a suspension portion 42. The fixed portion 41 is fixedly connected to the base member 20. The suspension portion 42 is connected to one side of the fixed portion 41 and is connected to the drive assembly 30 or the transmission wheel assembly 10. The suspension portion 42 is suspended relative to the base member 20. The suspension portion 42 is configured to displace relative to the fixed portion 41 when the drive assembly 30 drives the transmission wheel assembly 10 to tighten the transmission belt 203, thereby causing the deformable member 40 to deform. The detection member 50 is used to detect the deformation of the deformable member 40.

[0054] The tension of the transmission belt 203 can be directly transmitted to the transmission wheel assembly 10, and then transmitted to the drive assembly 30 through the transmission wheel assembly 10. In this way, the tension of the transmission belt 203 only needs to be transmitted to the suspension portion 42 through a relatively small number of components, resulting in less distortion of the tension received by the suspension portion 42. This reduces the error in the deformation detected by the detection member 50 of this embodiment and the corresponding tension. Furthermore, since the fixed portion 41 of the deformable member 40 remains fixed to the base member 20, the suspension portion 42 is suspended relative to the base member 20. When the suspension portion 42 is subjected to the tension, it will slightly displace relative to the fixed portion 41, causing the deformable member 40 to deform. Since the deformable member 40 is generally suspended relative to the base member 20, it can produce a large deformation under the action of a small tension. Thus, the deformable member 40 can also amplify the tension. The deformation of the deformable member 40 is then detected by the detection member 50, and the magnitude of the tension can be calculated based on the deformation of the deformable member 40. In this way, the tensioning assembly 100 of this embodiment can improve the tension detection effect of the transmission belt 203, reduce the tension detection error, and improve the tension adjustment accuracy of the transmission belt 203.

[0055] In some embodiments, the deformable member 40 and the detection member 50 may be encapsulated in the same structure and formed into a single component. In some embodiments, the deformable member 40 and the detection member 50 may be constructed as two connected components. This embodiment does not specifically limit the combination of the deformable member 40 and the detection member 50.

[0056] In some embodiments, see Figure 4 and Figure 5 The transmission wheel assembly 10 includes a transmission wheel 11, a mounting block 12, and a mounting shaft 13. The mounting block 12 defines a mounting slot 124. The mounting shaft 13 is positioned within the mounting slot 124 and connected to the mounting block 12. The transmission belt 203 passes through the mounting slot 124 and is wound around the transmission wheel 11. The transmission wheel 11 is rotatably connected to the mounting shaft 13. This facilitates connection of the mounting block 12 to the drive assembly 30.

[0057] In some embodiments, see Figure 5 The mounting slider 12 includes a first wall 121, a second wall 122, and a third wall 123. The first wall 121 is connected to the drive assembly 30. The second wall 122 and the third wall 123 are respectively connected to the ends of the first wall 121 and extend away from the drive assembly 30 in the displacement direction M. The first wall 121, the second wall 122, and the third wall 123 collectively define a mounting groove 124. The ends of the mounting shaft 13 are respectively connected to the second wall 122 and the third wall 123. The mounting shaft 13 is spaced apart from the first wall 121.

[0058] In some embodiments, see Figure 5 The base member 20 includes a top plate 21 and a bottom plate 22. The top plate 21 and the bottom plate 22 are spaced apart. The bottom plate 22 is provided with an escape hole 24, which penetrates the bottom plate 22 along the thickness direction of the bottom plate 22. The driving wheel 202 is arranged between the top plate 21 and the bottom plate 22 and corresponds to the escape hole 24. The rotating motor 201 is connected to the side of the bottom plate 22 facing away from the top plate 21. The output shaft of the rotating motor 201 passes through the escape hole 24 and is connected to the driving wheel 202.

[0059] In some embodiments, see Figure 5 The surface of the bottom plate 22 facing the top plate 21 is provided with a guide groove 23 extending along the displacement direction M. The mounting slider 12 of the transmission wheel assembly 10 is slidably disposed within the guide groove 23 along the displacement direction M. This improves the displacement accuracy of the transmission wheel assembly 10. In other embodiments, the surface of the top plate 21 facing the bottom plate 22 may also be provided with a guide groove 23, thereby providing guidance on both sides of the transmission wheel assembly 10.

[0060] In this embodiment, see Figure 6The driving wheel 202 and the idler wheel assembly 204 are spaced apart along the displacement direction M, and the transmission wheel assembly 10 is movably disposed on one side of the driving wheel 202. The transmission belt 203 moves along the displacement direction M to the side of the transmission wheel assembly 10 away from the driving assembly 30, then the transmission belt 203 wraps around the transmission wheel assembly 10 and turns, and then moves along the displacement direction M to the side of the driving wheel 202 away from the idler wheel assembly 204. Then, the transmission belt 203 wraps around the driving wheel 202 and turns, moving along the displacement direction M to the side of the idler wheel assembly 204 away from the driving wheel 202. Then, in a direction intersecting the displacement direction M (e.g., a direction perpendicular to the displacement direction M), the transmission belt 203 wraps around the idler wheel assembly 204, turns, and extends along the direction intersecting the displacement direction M to away from the idler wheel assembly 204.

[0061] In other embodiments, see Figure 7 The transmission belt 203 can also be constructed as a closed belt structure wound around the driving wheel 202, the idler wheel assembly 204 and the transmission wheel assembly 10.

[0062] In some embodiments, please refer again to Figure 3 and Figure 4 The driving assembly 30 includes a driving member 31. The driving member 31 includes a main body 311 and a movable shaft 312. The main body 311 and the suspension portion 42 are fixedly connected. One end of the movable shaft 312 is movably connected to the main body 311, and the other end of the movable shaft 312 is connected to the transmission wheel assembly 10. The suspension portion 42 is connected to the main body 311. The tension of the transmission belt 203 is configured to be transmitted to the suspension portion 42 through the transmission wheel assembly 10, the movable shaft 312 and the main body 311, so as to cause the deformation member 40 to deform.

[0063] During the movement of the drive wheel assembly 10 driven by the drive assembly 30, the displacement of the main body 311 relative to the base member 20 is smaller than the displacement of the drive wheel assembly 10 relative to the base member 20, which can reduce the deformation of the deformable member 40 during the tensioning process, thereby avoiding the problem of mismeasurement and reducing the deformation amount of the deformable member 40, thereby ensuring the stability of the deformable member 40 during long-term application. After repeated application, under the action of the same tensioning force, the change error of the deformation amount of the deformable member 40 is smaller, thereby improving the detection accuracy of the tensioning force and the service life of the tensioning assembly 100.

[0064] The detection part 50 can obtain the deformation of the deformable part 40 under the action of the tensioning force by collecting the deformation amount of the deformable part 40 after the tensioning action is completed, and then comparing it with the deformation amount of the deformable part 40 in the initial state. The deformation amount of the deformable part 40 during the execution of the tensioning action can be not used as a reference value for calculating the tensioning force.

[0065] In some embodiments, the driving member 31 is a linear motor. The motor has a self-locking property. In the event that the tensioning assembly 100 fails, the displacement driving assembly 200 can still achieve tensioning of the transmission belt 203 under the action of other transmission belt 203 tensioning structures. The main body 311 is the housing of the motor, and the movable shaft 312 is the output shaft of the motor. The linear motor also includes a mover and a stator. The mover and the stator can be movably matched. The matching method of the mover and the stator can refer to the relevant structure of the existing linear motor and will not be repeated here. The stator is fixedly connected to the main body 311. The output shaft is connected to the mover. In this way, after the tensioning force is transmitted to the movable shaft 312, the tensioning force is further transmitted to the power and is transmitted to the stator through the mover, so that the main body 311 connected to the stator is subjected to tensioning force and produces a certain displacement relative to the base member 20, causing the deformable member 40 to deform.

[0066] In some embodiments, see Figure 4 The drive assembly 30 further includes a signal transmission member 34. The signal transmission member 34 is electrically connected to the linear motor. The signal transmission member 34 and the detection member 50 are both connected to a controller (not shown). The controller can convert the deformation change detected by the detection member 50 into a change in tension and the value of the tension, and then output a control signal to the signal transmission member 34. The signal transmission member 34 can transmit the control signal to the linear motor, thereby controlling the linear motor to drive the transmission wheel assembly 10 to move along the displacement direction M to further tighten the transmission belt 203 or loosen the transmission belt 203.

[0067] In some embodiments, see Figure 4 The drive assembly 30 further includes a connector 32. One end of the connector 32 is connected to the output shaft. The other end of the connector 32 is connected to the transmission wheel assembly 10. Specifically, the connector 32 is connected to the mounting slider 12 of the transmission wheel assembly 10. This increases the spacing between the drive member 31 and the transmission wheel assembly 10 along the displacement direction M, thereby preventing interference between the drive member 31 and other components and improving the tensioning reliability of the tensioning assembly 100.

[0068] In some embodiments, see Figure 4 , the drive shaft extends into the connector 32. The drive assembly 30 also includes a third fastener 33, which passes through the connector 32 from a side and is fixedly connected to the drive shaft to achieve a fastened connection between the drive shaft and the connector 32. Optionally, there are two third fasteners 33, each passing through the connector 32 from either side to improve the fastening reliability of the drive shaft and the connector 32.

[0069] In some embodiments, the cross-section of the drive shaft is substantially rectangular, which can significantly reduce the possibility of the connector 32 rotating relative to the drive shaft, thereby ensuring the reliability of the connection between the drive shaft and the connector 32.

[0070] In other embodiments, the driving assembly 30 may be configured as a separate push rod, and the tensioning assembly 100 may complete the tensioning operation by manual tensioning.

[0071] In other embodiments, the suspension portion 42 may be fixedly connected to the transmission wheel assembly 10 (e.g., the mounting slider 12), or the connector 32 of the drive assembly 30. There are many ways to connect the suspension portion 42 to the transmission wheel assembly 10 or the drive assembly 30, which are not specifically limited in this embodiment.

[0072] In some embodiments, the connecting member 32 passes through the deformable member 40, with a gap between the connecting member 32 and the deformable member 40. This improves the integration of the drive assembly 30 and the deformable member 40 and prevents the deformation of the deformable member 40 caused by the movement of the connecting member 32, thereby ensuring both the integration of the tensioning assembly 100 and the accuracy of tensioning force detection.

[0073] In some embodiments, see Figures 8 to 10 The fixing portion 41 is fixedly connected to the base member 20 via a first fastener 61. The first fastener 61 can be constructed as a fastening structure such as a screw or a pin.

[0074] In some embodiments, see Figures 8 to 10 Along the displacement direction M, the deformable member 40 is disposed between the driver 31 and the base member 20. This improves the structural compactness of the tensioning assembly 100 and effectively prevents the deformable member 40 from being affected by other structures, thereby reducing detection errors. In other embodiments, the deformable member 40 can also be disposed on the side of the driver 31 facing away from the connecting member 32.

[0075] In some embodiments, see Figures 8 to 10 , the fixing portion 41 is fixedly connected to the side of the base member 20 close to the driving member 31 along the displacement direction M by a first fastener 61. Specifically, the base member 20 also includes a connecting boss 25. A connecting boss 25 is provided on the side of the top plate 21 close to the driving member 31 along the displacement direction M. Another connecting boss 25 is provided on the side of the top plate 21 close to the driving member 31 along the displacement direction M. There are two first fasteners 61. The two ends of the fixing portion 41 are respectively connected to a connecting boss 25 by a first fastener 61. The suspension portion 42 is spaced apart from the top plate 21, and the suspension portion 42 is also spaced apart from the bottom plate 22. In this way, the connecting boss 25 can more conveniently realize that the deformable member 40 is connected between the driving member 31 and the base member 20 in a suspended form.

[0076] Optionally, a first fastening hole K1 and a second fastening hole K2 are respectively provided at both ends of the lengthwise direction of the fixing portion 41. A first fastener 61 passes through the first fastening hole K1 to secure one end of the fixing portion 41 to one connecting boss 25. Another first fastener 61 passes through the second fastening hole K2 to secure the other end of the fixing portion 41 to the other connecting boss 25.

[0077] In some embodiments, see Figures 8 to 10 The two opposite sides of the main body 311 are respectively provided with connecting ears 313 (also can be seen in Figure 4 ). The connecting ear 313 is fixedly connected to the suspension portion 42 by a second fastener 62. A gasket 63 is further provided between the connecting ear 313 and the suspension portion 42 to improve the connection reliability between the main body 311 and the suspension portion 42. In some embodiments, the number of the second fasteners 62 and the gasket 63 is two. The two connecting ears 313 are fixedly connected to the two ends of the suspension portion 42 by two second fasteners 62 and two gaskets 63, respectively. In addition, the first fastener 61 and the second fastener 62 correspond to each other along the displacement direction M, thereby improving the uniformity of the fixed installation of the deformable member 40, making the deformable member 40 more evenly affected by the tensioning force, and being able to produce more uniform deformation under the action of the tensioning force, thereby further improving the detection accuracy.

[0078] Optionally, a third fastening hole K3 and a fourth fastening hole K4 are respectively provided at both ends of the lengthwise direction of the hanging portion 42. A second fastener 62 passes through the third fastening hole K3 to secure one end of the hanging portion 42 to one connecting lug 313. Another second fastener 62 passes through the fourth fastening hole K4 to secure the other end of the hanging portion 42 to the other connecting lug 313.

[0079] In some embodiments, see Figure 10 The deformable member 40 further includes a connecting portion 43. The connecting portion 43 is connected between the suspension portion 42 and the fixed portion 41. When the suspension portion 42 is subjected to a tensioning force and causes the deformable member 40 to deform, the deformation of the connecting portion 43 is relatively greater because both the suspension portion 42 and the fixed portion 41 play a fixing role. Thus, the connecting portion 43 can amplify the deformation of the deformable member 40, thereby improving the detection accuracy of the detection member 50 and, in turn, the tension force detection accuracy.

[0080] In some embodiments, see Figures 10 to 12 The connecting portion 43 defines a first space Q1 ; and / or, a second space Q2 is defined between the connecting portion 43 and the fixing portion 41 ; and / or, a third space Q3 is defined between the connecting portion 43 and the suspension portion 42 .

[0081] In this way, under the same tensioning force, the deformation of the deformable member 40 can be further increased, thereby further improving the tensioning force detection accuracy. In addition, the connecting member 32 can also pass through the first space Q1 to achieve a compact fit between the connecting member 32 and the deformable member 40.

[0082] In some embodiments, see Figure 10 The width of the connecting portion 43 is smaller than that of the fixing portion 41, which is in turn smaller than that of the suspending portion 42. This ensures both the reliable fixing of the fixing portion 41 to the base member 20 and the reliable fixing of the suspending portion 42 to the main body 311, while also increasing the deformation of the connecting portion 43 and improving the accuracy of tension force detection.

[0083] In some embodiments, the deformable member 40 is made of a conductive material, and the resistance of the deformable member 40 is configured to change when the deformable member 40 is deformed. The detection member 50 is electrically connected to the deformable member 40 and is configured to detect the resistance of the deformable member 40 .

[0084] The conductive material may be a conductive composite material, which may include a conductive portion and an insulating portion. The conductive portion may include conductive materials such as carbon nanotubes, carbon black, or graphene, or metal materials such as silver, bismuth-antimony alloy, copper, or nickel, or materials such as semiconductors and dielectrics. The insulating portion may be made of a polymer material or a metal material with a low conductivity coefficient. This embodiment does not specifically limit this.

[0085] In some embodiments, see Figure 11 and Figure 12 The detection member 50 includes a detection chip 51. The detection chip 51 is disposed at the connection portion 43 and is configured to detect the resistance of the deformable member 40. Placing the detection chip 51 at the connection portion 43 where the deformation of the deformable member 40 is the largest can improve detection accuracy and sensitivity.

[0086] In some embodiments, see Figure 11 and Figure 12 The detection member 50 also includes a signal transmission line 52. The signal transmission line 52 is connected to the detection chip 51 and the controller. The detection chip 51 can also obtain the deformation of the deformable member 40 based on the deformation detection resistance value and the preset mapping relationship between the resistance value and the deformation amount, and then transmit the deformation amount data to the controller via the signal transmission line 52. In this way, deformation detection and signal transmission of the deformable member 40 are achieved. The structure of the detection chip 51 for obtaining the resistance of the deformable member 40 can refer to existing resistance measurement chips and will not be described in detail in this embodiment.

[0087] In some embodiments, the signal transmission line 52 is connected to the detection chip 51 and extends from the side of the fixed portion 41 facing away from the suspension portion 42. This prevents the signal transmission line 52 from interfering with the deformation of the suspension portion 42 and the connection portion 43, further improving detection accuracy. Alternatively, the signal transmission line 52 can be fixed to the surface of the deformable member 40 using a fixing structure such as fixing glue.

[0088] In other embodiments, the deformation member 40 may not be made of a conductive material. Correspondingly, the detection member 50 may be constructed as a strain gauge, which is attached to the surface of the deformation member 40 and detects the deformation of the deformation member 40. The strain gauge can convert the deformation of the deformation member 40 into an electrical signal such as a resistance signal or a capacitance signal, and directly transmit the electrical signal. Alternatively, the detection member 50 can be constructed as an eddy current sensor, which can detect the deformation of the deformation member 40. Therefore, this embodiment does not limit the specific type and structure of the detection member 50, as long as it can realize the deformation detection of the deformation member 40.

[0089] In some embodiments, see Figure 11 The fixing portion 41 includes a first connecting segment 411 and a second connecting segment 412. The first connecting segment 411 is connected to the base member 20. The second connecting segment 412 is connected to the first connecting segment 411 and extends toward the suspension portion 42. The connecting portion 43 is connected between the first connecting segment 411 and the suspension portion 42. A second space Q2 is defined between the connecting portion 43 and the second connecting segment 412.

[0090] In this embodiment, see Figure 11 The suspension portion 42 includes a first portion 423 and a second portion 424. The first portion 423 is spaced apart from the first connecting segment 411. The second portion 424 is connected to the first portion 423 and extends toward the first connecting segment 411. The connecting portion 43 includes a first connecting arm 431 and a second connecting arm 432. The first connecting arm 431 is connected between one side of the second portion 424 and one second connecting segment 412. The second connecting arm 432 is connected between the other side of the second portion 424 and another second connecting segment 412. There are two detection chips 51, and the two detection chips 51 can be respectively provided on the first connecting arm 431 and the second connecting arm 432.

[0091] In this way, when the suspension part 42 displaces relative to the fixed part 41, the first connecting arm 431 and the second connecting arm 432 are twisted under the drive of the second part 424. Therefore, the deformation generated by the first connecting arm 431 and the second connecting arm 432 of the deformable member 40 is the largest. By providing detection chips 51 on both the first connecting arm 431 and the second connecting arm 432, the deformation detection accuracy can be improved.

[0092] Optionally, one of the two detection chips 51 is disposed at an end of the first connecting arm 431 close to the second portion 424 , and the other of the two detection chips 51 is disposed at an end of the second connecting arm 432 close to the second portion 424 .

[0093] In addition, in this embodiment, the suspension portion 42 may have an escape space to avoid the connecting member 32. Alternatively, the connecting member 32 is disposed outside the deformable member 40.

[0094] In other embodiments, see Figure 12 The suspension portion 42 includes a third connecting segment 421 and a fourth connecting segment 422. The third connecting segment 421 is spaced apart from the fixed portion 41. The fourth connecting segment 422 is connected to the third connecting segment 421 and extends toward the fixed portion 41. The connecting portion 43 is connected between the third connecting segment 421 and the fixed portion 41. A third space Q3 is defined between the connecting portion 43 and the fourth connecting segment 422.

[0095] In this embodiment, see Figure 12 , the fixing portion 41 is roughly in the shape of a long strip. The number of the fourth connecting segments 422 is two. The connecting portion 43 includes a first connecting arm 431 and a second connecting arm 432. The first connecting arm 431 is connected to one point of the third connecting segment 421, and the second connecting arm 432 is connected to the other side of the third connecting segment 421. The first connecting arm 431 and the second connecting arm 432 are spaced apart and form a first space Q1. The first connecting arm 431, the second connecting arm 432, a portion of the fixing portion 41 and a portion of the third connecting segment 421 together enclose the first space Q1. The number of the detection chips 51 is two, and the two detection chips 51 can be respectively arranged on the first connecting arm 431 and the second connecting arm 432.

[0096] In this way, when the suspension part 42 displaces relative to the fixed part 41, the first connecting arm 431 and the second connecting arm 432 are bent under the drive of the second part 424. Therefore, the deformation generated by the first connecting arm 431 and the second connecting arm 432 of the deformable member 40 is the largest. By providing detection chips 51 on both the first connecting arm 431 and the second connecting arm 432, the deformation detection accuracy can be improved.

[0097] Optionally, one of the two detection chips 51 is disposed at one end of the first connecting arm 431 close to the third connecting section 421 , and the other of the two detection chips 51 is disposed at one end of the second connecting arm 432 close to the third connecting section 421 .

[0098] Obviously, the above two embodiments are merely exemplary descriptions of the structure of the deformable member 40 of this embodiment. In other embodiments, the specific structure of the deformable member 40 can be adjusted accordingly according to actual detection needs. For example, the deformation of the connecting portion 43 can also be configured into other shapes such as a curve or a special shape.

[0099] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A tensioning assembly, comprising a transmission wheel assembly, wherein the transmission wheel assembly is used to support a transmission belt to tension the transmission belt, characterized in that: The tensioning assembly further comprises: Basic parts; A drive assembly, drivingly connected to the transmission wheel assembly and used to drive the transmission wheel assembly to move so as to tighten or loosen the transmission belt; The deformable member includes a fixed portion and a suspension portion, wherein the fixed portion is fixedly connected to the base member, the suspension portion is connected to one side of the fixed portion and is connected to the drive assembly or the transmission wheel assembly, the suspension portion is suspended relative to the base member, and the suspension portion is configured to be displaced relative to the fixed portion when the drive assembly drives the transmission wheel assembly to tighten the transmission belt, so as to cause the deformable member to deform; The detection member is used to detect the deformation generated by the deformable member.

2. The tensioning assembly according to claim 1, characterized in that: The driving assembly includes a driving member, which includes a main body and a movable shaft. The main body and the suspension part are fixedly connected. One end of the movable shaft is movably connected to the main body, and the other end of the movable shaft is connected to the transmission wheel assembly. The suspension part is connected to the main body.

3. The tensioning assembly according to claim 1, characterized in that: The deformable member further includes a connecting portion connected between the suspension portion and the fixing portion.

4. The tensioning assembly according to claim 3, characterized in that: The connecting portion defines a first space; and / or, A second space is defined between the connecting portion and the fixing portion; and / or, A third space is defined between the connecting portion and the suspended portion.

5. The tensioning assembly according to claim 4, characterized in that: The fixing portion includes a first connecting segment and a second connecting segment, the first connecting segment is connected to the base member, the second connecting segment is connected to the first connecting segment and extends toward the suspension portion, the connecting portion is connected between the first connecting segment and the suspension portion, and the second space is defined between the connecting portion and the second connecting segment.

6. The tensioning assembly according to claim 4, characterized in that: The suspension portion includes a third connecting segment and a fourth connecting segment, the third connecting segment is spaced apart from the fixed portion, the fourth connecting segment is connected to the third connecting segment and extends toward the fixed portion, the connecting portion is connected between the third connecting segment and the fixed portion, and the third space is defined between the connecting portion and the fourth connecting segment.

7. The tensioning assembly according to any one of claims 1 to 6, characterized in that: The deformable member is made of a conductive material, and the resistance of the deformable member is configured to change when the deformable member is deformed. The detecting member is electrically connected to the deformable member and is configured to detect the resistance of the deformable member.

8. The tensioning assembly according to claim 7, characterized in that The detection element includes a detection chip; The deformable member further includes a connecting portion connected between the suspension portion and the fixing portion. The detection chip is provided at the connecting portion and is configured to detect the resistance of the deformable member.

9. A displacement drive assembly, characterized in that: include: Rotating electric machines; a transmission belt, the transmission belt being matched with the rotating motor and being used for moving under the drive of the rotating motor; At least one tensioning assembly according to any one of claims 1 to 8, wherein the transmission wheel assembly of the tensioning assembly is supported on the transmission belt and is used to tension the transmission belt.

10. A 3D printing device, characterized in that: include: frame; The displacement drive assembly according to claim 9, wherein the displacement drive assembly is mounted on the frame.

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