Synchronous transmission mechanism and fixed bridge type image measuring instrument

Abstract

The application relates to a synchronous transmission mechanism and a fixed bridge type image measuring instrument, which comprises a first transmission belt, a second transmission belt, a transmission shaft and a pre-tightening device; the transmission shaft is provided with sixth rotating wheels and seventh rotating wheels with equal diameters at two ends; the first transmission belt is in mesh transmission with the sixth rotating wheels; the second transmission belt is in mesh transmission with the seventh rotating wheels; the first transmission belt comprises a first part and a second part, and the second transmission belt comprises a third part and a fourth part; the first part of the first transmission belt is in transmission connection with a measuring head, and the third part of the second transmission belt is in transmission connection with a bottom light device; or the second part of the first transmission belt is in transmission connection with the measuring head, and the fourth part of the second transmission belt is in transmission connection with the bottom light device; the pre-tightening device is used for tensioning at least one of the first transmission belt and the second transmission belt. The synchronous transmission mechanism and the fixed bridge type image measuring instrument have the advantages of high measuring precision.

Description

Technical Field

[0001] This application relates to the field of measurement technology, and in particular to a synchronous transmission mechanism and a fixed bridge image measuring instrument. Background Technology

[0002] The fixed bridge-type image measuring instrument includes a probe and a light source system. The probe is used to photograph the workpiece; the light source system includes bottom light that illuminates the workpiece from below.

[0003] To ensure consistent measurement conditions, the relative positions of the light source system and the probe must remain fixed during the shooting process. Otherwise, different measurement conditions will lead to different measurement results, i.e., deviations in the measurement results. In particular, because the bottom light is set at the bottom of the worktable, it is difficult to achieve synchronous movement of the probe and the light source, ultimately resulting in low measurement accuracy of the fixed bridge image measuring instrument. Utility Model Content

[0004] Therefore, it is necessary to provide a synchronous transmission mechanism and a fixed bridge image measuring instrument to address the problem of low measurement accuracy of fixed bridge image measuring instruments.

[0005] This application provides a synchronous transmission mechanism, including a first transmission belt, a second transmission belt, a transmission shaft, and a pretensioning device; the transmission shaft has a sixth rotating wheel and a seventh rotating wheel with equal diameters at both ends; the first transmission belt meshes with the sixth rotating wheel; the second transmission belt meshes with the seventh rotating wheel; the first transmission belt includes a first part and a second part, the first part and the second part being respectively a distant section away from the sixth rotating wheel and a close section near the sixth rotating wheel when the first transmission belt rotates clockwise around the sixth rotating wheel; the second... The transmission belt includes a third part and a fourth part; the third part and the fourth part are respectively a distant section away from the seventh rotating wheel and a close section near the seventh rotating wheel when the second transmission belt rotates clockwise around the seventh rotating wheel; a first part of the first transmission belt is drivenly connected to the probe, and a third part of the second transmission belt is drivenly connected to the bottom light device; or, a second part of the first transmission belt is drivenly connected to the probe, and a fourth part of the second transmission belt is drivenly connected to the bottom light device; the pretensioning device is used to tension at least one of the first transmission belt and the second transmission belt.

[0006] In one embodiment, the synchronous transmission mechanism includes a first rotating wheel, a second rotating wheel, a third rotating wheel, and a fourth rotating wheel; the first rotating wheel and the fourth rotating wheel are located at the same end along a first direction, and the first rotating wheel is higher than the fourth rotating wheel along a third direction; the second rotating wheel and the third rotating wheel are both located at the same other end along the first direction, and the second rotating wheel is higher than the third rotating wheel along the third direction; the section of the first transmission belt above the first rotating wheel and the second rotating wheel is the first portion, and the section of the first transmission belt below the third rotating wheel and the fourth rotating wheel is the second portion; the third direction intersects with the first direction.

[0007] In one embodiment, one end of the first transmission belt is connected to one side of the probe, and the other end of the first transmission belt is sequentially wound around the second rotating wheel, the transmission shaft, the third rotating wheel, the fourth rotating wheel and the first rotating wheel, and connected to the other side of the probe; the pre-tensioning device is disposed on the section of the first transmission belt located between the fourth rotating wheel and the first rotating wheel.

[0008] In one embodiment, the bottom light device includes a slider, a light source, and a slide rail. The light source is fixedly connected to the slider, and the slide rail is disposed within the base along the first direction. The slider is slidably connected to the slide rail. The synchronous transmission mechanism includes a fifth rotating wheel, and the fifth rotating wheel and the transmission shaft are distributed on both sides of the base along the first direction. One end of the second transmission belt is wound around the fifth rotating wheel, and the other end is connected to the transmission shaft. The section of the second transmission belt above the fifth rotating wheel and the transmission shaft is the third part, and the section of the second transmission belt below the fifth rotating wheel and the transmission shaft is the fourth part. The slider is fixedly connected to the second transmission belt.

[0009] In one embodiment, the first transmission belt is a synchronous belt, a belt, a steel belt, or a transmission rope; and / or, the second transmission belt is a synchronous belt, a belt, a steel belt, or a transmission rope.

[0010] In one embodiment, the synchronous transmission mechanism includes an eighth rotating wheel, and the first transmission belt is wound around the eighth rotating wheel in the section between the pretensioning device and the first rotating wheel.

[0011] In one embodiment, the fourth rotating wheel, the third rotating wheel, and the eighth rotating wheel are all smooth guide wheels; and / or, the first rotating wheel and the second rotating wheel are rotating wheels with a toothed structure.

[0012] In one embodiment, the pretensioning device includes a ninth rotating wheel and a wheel frame; the ninth rotating wheel is rotatably mounted in the wheel frame, and the wheel frame is offset toward the side that tensions at least one of the first drive belt and the second drive belt.

[0013] In one embodiment, the pre-tightening device further includes a stop, an elastic part, and at least one guide part; the wheel frame is slidably disposed on the guide part; the elastic part elastically abuts between the stop and the wheel frame to drive the wheel frame to shift away from the stop.

[0014] A second aspect of this application provides a fixed bridge-type image measuring instrument, comprising: a base; a probe movably disposed above the base along a first direction; a bottom light device movably disposed within the base along the first direction; and the aforementioned synchronous transmission mechanism, wherein the synchronous transmission mechanism is used to drive the bottom light device and the probe to move synchronously along the first direction.

[0015] The beneficial effects are:

[0016] An embodiment of this application provides a synchronous transmission mechanism comprising a first transmission belt, a second transmission belt, a transmission shaft, and a pre-tensioning device. The transmission shaft has a sixth rotating wheel and a seventh rotating wheel of equal diameter at both ends. The first transmission belt engages with the sixth rotating wheel, and the second transmission belt engages with the seventh rotating wheel. The first transmission belt includes a first part and a second part, and the second transmission belt includes a third part and a fourth part. Thus, by connecting the first and second transmission belts at both ends of the transmission shaft, the moving speeds of the first and second transmission belts are ensured to be equal. Furthermore, by combining the first, second, third, and fourth parts, the bottom light device and the probe can move in the same direction, ultimately ensuring that the bottom light device and the probe move in the same direction and at the same speed, achieving synchronous movement. This, in turn, ensures the measurement accuracy of the fixed bridge image measuring instrument and prevents large measurement deviations. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a fixed bridge-type image measuring instrument provided in some embodiments of this application.

[0018] Figure 2 This is a front view of a fixed bridge-type image measuring instrument provided in some embodiments of this application, wherein the outer casing, column worktable, and probe are partially omitted.

[0019] Figure 3 This is a schematic diagram illustrating the cooperation of the synchronous transmission mechanism, the bottom light device, and the pre-tightening device provided in some embodiments of this application.

[0020] Figure 4 This is a schematic diagram of the assembly of a portion of the synchronous transmission mechanism and the pre-tightening device provided in some embodiments of this application.

[0021] Figure 5 This is a schematic diagram of the pre-tightening device provided in some embodiments of this application.

[0022] Figure 6 This is a schematic diagram of the pre-tightening device provided in some other embodiments of this application. Detailed Implementation

[0023] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0025] In the description of the embodiments of this application, if the technical terms such as "first" and "second" appear, these terms are used only for descriptive purposes to distinguish different objects, and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0028] In the description of the embodiments of this application, if the term "multiple" appears, "multiple" means at least two (including two), such as two, three, etc., unless otherwise explicitly specified. Similarly, if the term "multiple sets" appears, "multiple sets" refers to two or more sets (including two sets), and if the term "multiple pieces" appears, "multiple pieces" refers to two or more pieces (including two pieces).

[0029] In the description of the embodiments of this application, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0030] In the description of the embodiments of this application, unless otherwise explicitly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0033] In related technologies, a fixed-bridge image measuring instrument includes a probe, a light source system, a motion system, and a worktable. The probe is used to photograph the workpiece; the light source system may include coaxial light, bottom light, surface light (ring light), etc., used to illuminate the workpiece and highlight its edges or image features; the motion system includes an X-axis drive structure, a Y-axis drive structure, and a Z-axis drive structure, which control the relative movement of the probe and the worktable in the X, Y, and Z directions, respectively.

[0034] In fixed-bridge imaging measuring instruments, different types of light sources can highlight different features of the workpiece. To ensure consistent measurement conditions, the relative positions of the light source and the lens must be kept fixed during the imaging process; otherwise, different measurement conditions will lead to different measurement results, i.e., deviations in the measurement results. Ring lights and coaxial lights are generally directly mounted on the probe head, thus they can move synchronously with the lens on the probe head. Bottom lights, on the other hand, are generally located at the bottom of the worktable, making it difficult to achieve synchronous movement with the light source.

[0035] Therefore, a synchronous transmission mechanism can be added to the fixed bridge image measuring instrument to enable the bottom light and the probe to move synchronously, thereby ensuring measurement accuracy and preventing large measurement deviations. However, with the increase of use, some synchronous transmission mechanisms become loose due to long-term stress deformation, material creep, and mechanical wear, resulting in synchronization deviations. This makes it impossible for the light source and lens to remain relatively fixed, leading to deviations in the measurement results and low measurement accuracy of the fixed bridge image measuring instrument.

[0036] This application provides a fixed bridge-type image measuring instrument.

[0037] See Figures 1 to 6 As shown, the fixed bridge-type image measuring instrument includes: a base 100, a probe 200, a bottom light device 300, and a synchronous transmission mechanism 400.

[0038] The probe 200 is movably arranged above the base 100 along the first direction X. The bottom light device 300 is movably disposed within the base 100 along the first direction X. The synchronous transmission mechanism 400 is used to drive the bottom light device 300 and the probe 200 to move synchronously along the first direction X. The pre-tensioning device 500 is configured to provide tension to the synchronous transmission mechanism 400.

[0039] The probe 200 is used to photograph the workpiece; the probe 200 includes a sliding block 220 and a lens 210 disposed on the sliding block 220. The bottom light device 300 is located below the probe 200, usually in the center of the field of view of the lens 210 of the probe 200, so as to illuminate the workpiece from the bottom and facilitate the measurement of the pattern.

[0040] By setting a synchronous transmission mechanism 400 to drive the bottom light device 300 and the probe 200 to move synchronously along the first direction X, the bottom light device 300 and the probe 200 can achieve synchronous movement, thereby ensuring measurement accuracy and preventing large measurement deviations. A pre-tensioning device 500 is set to provide tension to the synchronous transmission mechanism 400, so that the synchronous transmission mechanism 400 can maintain a continuous tension state and prevent slack. This effectively improves the transmission slack problem of the synchronous transmission mechanism 400 caused by long-term stress deformation, material creep and mechanical wear in related technologies, and ensures that the bottom light device 300 and the probe 200 can maintain a precise displacement synchronization relationship during synchronous movement along the first direction X, thereby ensuring that the fixed bridge image measuring instrument has high measurement accuracy.

[0041] It is understood that synchronous motion in the embodiments of this application means that the bottom light device 300 and the probe 200 can move in the same direction and at the same speed.

[0042] It should be noted that those skilled in the art should know that the fixed bridge image measuring instrument also includes other components necessary to complete the image measuring function.

[0043] For example, the fixed bridge-type image measuring instrument also includes a worktable 630, which is movably mounted on the base 100 along the second direction Y, with the probe 200 located above the worktable 630 and the bottom light device 300 located below the worktable 630.

[0044] Optionally, the workbench 630 has a light-transmitting surface, for example, it can be a glass platform.

[0045] For example, the fixed bridge imaging measuring instrument also includes an X-axis drive structure (not shown), a Y-axis drive structure (not shown), and a Z-axis drive structure (not shown). The probe 200 includes a sliding block 220 and a lens 210 disposed on the sliding block 220. The Z-axis drive structure is used to drive the lens 210 to move up and down along the third direction Z. The X-axis drive structure is used to drive the sliding block 220 of the probe 200 to move left and right along the first direction X. The Y-axis drive structure is used to drive the worktable 630 to move back and forth along the second direction Y.

[0046] The X-axis drive structure, Y-axis drive structure, and Z-axis drive structure can be a motor, a pneumatic cylinder, or a pneumatic cylinder structure, and this application does not limit them.

[0047] This application also provides a synchronous transmission mechanism 400, which is applied in the above-mentioned fixed bridge image measuring instrument.

[0048] See Figures 1 to 4 As shown, the synchronous transmission mechanism 400 includes a first transmission belt 410, a second transmission belt 420, a transmission shaft 430 extending along a second direction Y, and at least one pretensioning device 500.

[0049] The drive shaft 430 has a sixth rotating wheel 431 and a seventh rotating wheel 432 at its two ends along the second direction Y; the first drive belt 410 meshes with the sixth rotating wheel 431 for transmission; and the second drive belt 420 meshes with the seventh rotating wheel 432 for transmission.

[0050] The sixth rotating wheel 431 has the same diameter as the seventh rotating wheel 432.

[0051] The first transmission belt 410 includes a first portion 415 and a second portion 416. The first portion 415 and the second portion 416 are respectively the section of the first transmission belt 410 that is away from the sixth rotating wheel 431 and the section that is close to the sixth rotating wheel 431 when the first transmission belt 410 rotates clockwise around the sixth rotating wheel 431. That is to say, when the first transmission belt 410 rotates clockwise around the sixth rotating wheel 431, the first portion 415 is the section of the first transmission belt 410 that is away from the sixth rotating wheel 431, and the second portion 416 is the section of the first transmission belt 410 that is close to the sixth rotating wheel 431.

[0052] The second transmission belt 420 includes a third part 422 and a fourth part 423; the third part 422 and the fourth part 423 are respectively the section of the second transmission belt 420 that is away from the seventh rotating wheel 432 and the section that is close to the seventh rotating wheel 432 when the second transmission belt 420 rotates clockwise around the seventh rotating wheel 432. That is to say, when the second transmission belt 420 rotates clockwise around the seventh rotating wheel 432, the third part 422 is the section of the second transmission belt 420 that is away from the seventh rotating wheel 432, and the fourth part 423 is the section of the second transmission belt 420 that is close to the seventh rotating wheel 432.

[0053] Combination Figure 3 As shown, the first transmission belt 410 includes a first portion 415 located on the upper side and a second portion 416 located on the lower side, and the second transmission belt 420 includes a third portion 422 located on the upper side and a fourth portion 423 located on the lower side.

[0054] The first portion 415 of the first transmission belt 410 is connected to the movable probe 200 along the first direction X, and the second transmission belt 420 is connected to the movable ground optical device 300 along the first direction X. The two ends of the transmission shaft 430 are respectively connected to the second portion 416 of the first transmission belt 410 and the fourth portion 423 of the second transmission belt 420. Alternatively, the second portion 416 of the first transmission belt 410 is connected to the movable probe 200 along the first direction X, and the fourth portion 423 of the second transmission belt 420 is connected to the movable ground optical device 300 along the first direction X; the two ends of the transmission shaft 430 are respectively connected to the second portion 416 of the first transmission belt 410 and the fourth portion 423 of the second transmission belt 420.

[0055] The second direction Y is set to intersect with the first direction X.

[0056] For ease of explanation, the embodiments of this application define a first direction X and a second direction Y, combined with... Figure 1 The orientations are such that the first direction X and the second direction Y intersect each other, including perpendicular intersections. In a specific embodiment, the first direction X can be a left-right direction parallel to the horizontal plane, and the second direction can be a front-back direction parallel to the horizontal plane.

[0057] By setting up a first transmission belt 410 and a second transmission belt 420, and dividing the first transmission belt 410 into a first part 415 and a second part 416, and the second transmission belt 420 into a third part 422 and a fourth part 423, the first transmission belt 410 is connected to the probe 200, and the second transmission belt 420 is connected to the bottom light device 300. The two ends of the transmission shaft 430 are respectively connected to the first transmission belt 410 and the second transmission belt 420. When the probe 200 moves left and right along the first direction X to observe the workpiece, the displacement of the probe 200 is transmitted to the transmission shaft 430 through the first transmission belt 410, and then to the second transmission belt 420. The second transmission belt 420 drives the bottom light device 300 to move left and right along the first direction X, so that the bottom light device 300 and the probe 200 can move synchronously along the first direction X. This ensures the measurement accuracy of the fixed bridge image measuring instrument and prevents large measurement deviations.

[0058] It should be emphasized that the first portion 415 of the first transmission belt 410 is connected to the probe 200, which is movably connected along the first direction X, and the second transmission belt 420 is connected to the bottom light device 300, which is movably connected along the first direction X, so that the bottom light device 300 and the probe 200 can move in the same direction. Specifically, in conjunction with Figure 2 As shown, the probe 200 is connected to the first part 415. When the probe 200 moves to the left, it drives the first transmission belt 410 to rotate clockwise, which in turn drives the second transmission belt 420 to rotate clockwise through the transmission shaft 430, causing the bottom light device 300 to move to the left, so that the bottom light device 300 and the probe 200 can move in the same direction.

[0059] Similarly, the second part 416 of the first transmission belt 410 is connected to the probe 200, which is movable along the first direction X, and the fourth part 423 of the second transmission belt 420 is connected to the bottom light device 300, which is movable along the first direction X; this allows the bottom light device 300 and the probe 200 to move in the same direction. Further details are omitted here.

[0060] In this embodiment, the sixth rotating wheel 431 and the seventh rotating wheel 432 are both rotating wheels with toothed structures, so that they can mesh with the first transmission belt 410 and the second transmission belt 420 respectively to achieve displacement transmission.

[0061] Specifically, the first transmission belt 410 is wound around the sixth rotating wheel 431, and the first transmission belt 410 meshes with the sixth rotating wheel 431; the second transmission belt 420 is wound around the seventh rotating wheel 432, and the second transmission belt 420 meshes with the seventh rotating wheel 432. When the probe 200 moves left and right along the first direction X to observe the workpiece, the displacement of the probe 200 drives the first transmission belt 410 to move, and then the meshing of the first transmission belt 410 with the sixth rotating wheel 431 causes the transmission shaft 430 to rotate clockwise or counterclockwise, which in turn drives the seventh rotating wheel 432 to rotate clockwise or counterclockwise. The seventh rotating wheel 432 meshes with the second transmission belt 420 for transmission. Thus, the second transmission belt 420 can drive the bottom light device 300 to move left and right along the first direction X, and finally enable the bottom light device 300 and the probe 200 to move synchronously along the first direction X, thereby ensuring the measurement accuracy of the fixed bridge image measuring instrument and preventing large measurement deviations.

[0062] It is important to understand that the diameters of the sixth rotating wheel 431 and the seventh rotating wheel 432 should be equal. This ensures that the first transmission belt 410 and the second transmission belt 420 are connected to the two ends of the transmission shaft 430 respectively, guaranteeing that the moving speeds of the first transmission belt 410 and the second transmission belt 420 are equal.

[0063] By combining the first part 415, the second part 416, the third part 422, and the fourth part 423, the bottom light device 300 and the probe 200 can move in the same direction, ultimately ensuring that the bottom light device 300 and the probe 200 can move in the same direction and at the same speed, thus achieving synchronous movement.

[0064] Optionally, the first transmission belt 410 may be a synchronous belt, a belt, a steel belt, or a transmission rope.

[0065] Optionally, the second drive belt 420 may be a synchronous belt, a belt, a steel belt, or a drive rope.

[0066] For ease of understanding, in the following embodiments, the first transmission belt 410 and the second transmission belt 420 are described as synchronous belts.

[0067] In some possible embodiments, see Figures 1 to 4 As shown, the pretensioning device 500 is used to tension at least one of the first drive belt 410 and the second drive belt 420.

[0068] That is, in some embodiments, the pretensioning device 500 may be disposed on the first drive belt 410 to provide pretension force and prevent the first drive belt 410 from loosening. In other embodiments, the pretensioning device 500 may be disposed on the second drive belt 420 to provide pretension force and prevent the second drive belt 420 from loosening.

[0069] In some embodiments, a pretensioning device 500 may be provided on the first transmission belt 410 and the second transmission belt 420 respectively, so that the pretensioning device 500 provides pretensioning force to the first transmission belt 410 and the second transmission belt 420 respectively, to prevent the first transmission belt 410 and the second transmission belt 420 from loosening. It should be noted that since there is a certain distance between the first transmission belt 410 and the second transmission belt 420 along the second direction Y, the first wheel and the second wheel are connected by a relatively long transmission shaft 430. By setting a pre-tensioning device 500 on each of the first transmission belt 410 and the second transmission belt 420, it can be ensured that both the first transmission belt 410 and the second transmission belt 420 have sufficient pre-tension force. Therefore, the pre-tensioning device 500 does not need to be too large, which is beneficial to the simplification of the structure and the reduction of weight. This arrangement can also ensure that the first wheel 411, the second wheel 412, the third wheel 413, the fourth wheel 414, the fifth wheel 421, the sixth wheel 431, the seventh wheel 432 and the eighth wheel 417 are subjected to balanced force, thereby extending the service life of the synchronous transmission mechanism 400 and making its transmission function stable.

[0070] Thus, by setting the pre-tensioning device 500 to tension at least one of the first transmission belt 410 and the second transmission belt 420, the bottom light device 300 and the probe 200 can always maintain synchronous movement along the first direction X, thereby ensuring the measurement accuracy of the fixed bridge image measuring instrument and preventing large measurement deviations.

[0071] Optionally, the pretensioning device 500 can be disposed at the end of the first transmission belt 410 / second transmission belt 420, thereby enabling it to be tightened in one direction to complete the tensioning action.

[0072] In some possible embodiments, the fixed bridge-type imaging measuring instrument further includes a crossbeam 610 and two columns 620. The crossbeam 610 is horizontally positioned above the base 100 along a first direction X, and the two columns 620 respectively support the two ends of the crossbeam 610. The probe 200 is movably mounted on the crossbeam 610.

[0073] Both the crossbeam 610 and the column 620 can be made of aluminum profiles, which are lightweight and high-strength, effectively reducing the vibration of the probe 200 when it moves left and right along the first direction X on the crossbeam 610, thus improving measurement accuracy. The crossbeam 610 and the column 620 can also be made of marble, which is resistant to deformation and highly stable.

[0074] Typically, the probe 200 is positioned on the front side of the crossbeam 610 along the second direction Y. Since the bottom light device 300 needs to be positioned in the center of the field of view of the probe 200, the bottom light device 300 is not directly below the crossbeam 610, but is located in a protruding position along the second direction Y.

[0075] In some possible embodiments, see Figures 1 to 4 As shown, the synchronous transmission mechanism 400 includes a first rotating wheel 411, a second rotating wheel 412, a third rotating wheel 413, and a fourth rotating wheel 414.

[0076] The first rotating wheel 411 and the fourth rotating wheel 414 are both located at the same end along the first direction X, for example Figure 2 The right end of the middle crossbeam 610, and the first rotating wheel 411 is higher than the fourth rotating wheel 414 along the third direction Z; the second rotating wheel 412 and the third rotating wheel 413 are located at the same other end along the first direction X, for example Figure 2 The left end of the middle crossbeam 610, and the second rotating wheel 412 is higher than the third rotating wheel 413 along the third direction Z.

[0077] The section of the first transmission belt 410 located above the first rotating wheel 411 and the second rotating wheel 412 is the first part 415, and the section of the first transmission belt 410 located below the third rotating wheel 413 and the fourth rotating wheel 414 is the second part 416.

[0078] The third direction Z, the second direction Y, and the first direction X are set to intersect each other.

[0079] For ease of explanation, the embodiments of this application define a first direction X, a second direction Y, and a third direction Z, combined with... Figure 1 and Figure 2 The directions of the first direction X, the second direction Y, and the third direction Z are intersecting each other. Here, intersecting each other includes intersecting each other perpendicularly.

[0080] To facilitate understanding of the embodiments of this application, in Figures 1 to 4 In the illustrated embodiment, the example given is that the first direction X, the second direction Y, and the third direction Z intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. In a specific embodiment, the first direction X can be a left-right direction parallel to the horizontal plane, the second direction can be a front-back direction parallel to the horizontal plane, and the third direction Z can be a vertical direction.

[0081] The first transmission belt 410 is wound around the second rotating wheel 412, the transmission shaft 430, the third rotating wheel 413, the fourth rotating wheel 414, and the first rotating wheel 411 in sequence.

[0082] The first transmission belt 410 can be a closed annular belt, with the probe 200 fixedly connected to the first transmission belt 410; or the two ends of the first transmission belt 410 can be fixed to the two sides of the probe 200 respectively to form an overall ring; the embodiments of this application do not limit this.

[0083] One end of the first transmission belt 410 is connected to one side of the probe 200. The other end of the first transmission belt 410 is sequentially wound around the second rotating wheel 412, the transmission shaft 430, the third rotating wheel 413, the fourth rotating wheel 414, and the first rotating wheel 411, and is connected to the other side of the probe 200. The pretensioning device 500 is provided on the section of the first transmission belt 410 located between the fourth rotating wheel 414 and the first rotating wheel 411.

[0084] By setting the first rotating wheel 411, the second rotating wheel 412, the third rotating wheel 413, and the fourth rotating wheel 414, when the probe 200 moves along the first direction X, it will drive the first transmission belt 410 to move. The first transmission belt 410 is precisely engaged with at least one of the first rotating wheel 411, the second rotating wheel 412, the third rotating wheel 413, and the fourth rotating wheel 414, and the direction is adjusted by the first rotating wheel 411, the second rotating wheel 412, the third rotating wheel 413, and the fourth rotating wheel 414.

[0085] Combination Figure 2 and Figure 3 As shown, the first rotating wheel 411 and the second rotating wheel 412 are at the same height in the third direction Z and are set at both ends of the crossbeam 610 along the first direction X. The third rotating wheel 413 and the fourth rotating wheel 414 are set in a similar manner.

[0086] Thus, the first portion (not shown) of the first transmission belt 410 above the first rotating wheel 411 and the second rotating wheel 412 is arranged along the extension direction of the crossbeam 610, and the second portion (not shown) of the first transmission belt 410 below the third rotating wheel 413 and the fourth rotating wheel 414 is also arranged along the extension direction of the crossbeam 610, ensuring that the first transmission belt 410 is completely located inside the crossbeam 610 and the column 620. This reduces the impact of the installation of the first transmission belt 410 on the internal space of the base 100. Furthermore, it facilitates the installation of structures such as the worktable 630 (mentioned below), the slide rail 330 (mentioned below), and the lead screw in the area of ​​the base 100 below the column 620, avoiding interference between the installation of the first transmission belt 410 and the above structures or the movement of the worktable 630.

[0087] The pre-tensioning device 500 is disposed on the section of the first transmission belt 410 located between the fourth rotating wheel 414 and the first rotating wheel 411. Thus, the pre-tensioning device 500 can be located inside the column 620, away from the second rotating wheel 412, effectively utilizing space and avoiding interference. The pre-tensioning device 500 provides pre-tension force to prevent the first transmission belt 410 and / or the second transmission belt 420 from loosening, ensuring that the bottom light device 300 and the probe 200 maintain synchronous movement along the first direction X. This, in turn, ensures the measurement accuracy of the fixed bridge image measuring instrument and prevents large measurement deviations.

[0088] Optionally, the fourth rotating wheel 414 and the third rotating wheel 413 can be smooth guide wheels. Furthermore, the first rotating wheel 411 and the second rotating wheel 412 are rotating wheels with a toothed structure, which facilitates engagement with the first transmission belt 410 and makes the transmission more precise.

[0089] In some possible embodiments, see Figures 1 to 4 As shown, the bottom lighting device 300 includes a slider 310, a light source 320, and a slide rail 330. The light source 320 is fixedly connected to the slider 310, and the slide rail 330 is disposed in the base 100 along the first direction X. The slider 310 is slidably connected to the slide rail 330.

[0090] The synchronous transmission mechanism 400 includes a fifth rotating wheel 421, and the fifth rotating wheel 421 and the transmission shaft 430 are distributed on both sides of the base 100 along the first direction X. One end of the second transmission belt 420 is wound around the fifth rotating wheel 421, and the other end is connected to the transmission shaft 430 for transmission. The slider 310 is fixedly connected to the second transmission belt 420.

[0091] The section of the second transmission belt 420 above the fifth rotating wheel 421 and the transmission shaft 430 is the third part 422, and the section of the second transmission belt 420 below the fifth rotating wheel 421 and the transmission shaft 430 is the fourth part 423.

[0092] The second transmission belt 420 can be a closed annular belt, with the slider 310 fixedly connected to the first transmission belt 410; or it can be formed by fixing the two ends of the slider 310 to both sides of the slider 310 to form an overall ring; the embodiments of this application do not limit this.

[0093] The fifth rotating wheel 421 is a toothed rotating wheel. In this way, the fifth rotating wheel 421 can mesh with the second transmission belt 420 to achieve displacement transmission.

[0094] The second transmission belt 420 is configured such that one end is wound around the fifth rotating wheel 421 and the other end is connected to the transmission shaft 430; the second transmission belt 420 is precisely engaged with the fifth rotating wheel 421 and the transmission shaft 430 respectively to transmit power, and the direction is adjusted by the fifth rotating wheel 421 and the transmission shaft 430.

[0095] Combination Figure 2 and Figure 3 As shown, the fifth rotating wheel 421 and the drive shaft 430 are at the same height in the third direction Z and are disposed on both sides of the base 100 along the first direction 100. Thus, the third portion of the second drive belt 420 above the fifth rotating wheel 421 and the drive shaft 430 extends along the first direction 100, and the fourth portion of the second drive belt 420 below the fifth rotating wheel 421 and the drive shaft 430 extends along the first direction 100, ensuring that the second drive belt 420 is completely located inside the base 100.

[0096] The slider 310 is fixedly connected to the second transmission belt 420. When the probe 200 moves left and right along the first direction X to observe the workpiece, the displacement of the probe 200 is transmitted to the transmission shaft 430 through the first transmission belt 410, and then to the second transmission belt 420. The second transmission belt 420 drives the slider 310 to move left and right along the first direction X, so that the bottom light device 300 and the probe 200 move synchronously along the first direction X. This ensures the measurement accuracy of the fixed bridge image measuring instrument and prevents large measurement deviations.

[0097] In some possible embodiments, see Figures 1 to 4 As shown, the drive shaft 430 is arranged on one side of the base 100 along the first direction X to avoid interference with other structures within the base 100.

[0098] Typically, combined Figure 1 and Figure 3 The second transmission belt 420 is not located directly below the crossbeam 610, but is located in a protruding position inside the base 100 along the second direction Y forward.

[0099] The first conventional belt 410 and the second transmission belt 420 are projected onto a horizontal plane along the third direction Z, and they have a certain distance along the second direction Y, which is less than the length of the transmission shaft 430 along the second direction Y.

[0100] In some possible embodiments, the length of the drive shaft 430 along the second direction Y is 30cm to 250cm. By setting the drive shaft 430 to extend along the second direction Y and connecting the first conventional belt 410 and the second drive belt 420 respectively, transmission is achieved, ultimately enabling the bottom light device 300 and the probe 200 to move synchronously along the first direction X, thereby ensuring the measurement accuracy of the fixed bridge image measuring instrument and preventing large measurement deviations.

[0101] In a specific embodiment, the length of the drive shaft 430 along the second direction Y can be 50mm to 200mm. For example, 50mm, 60mm, 75mm, 85mm, 100mm, 110mm, 124mm, 145mm, 150mm, 158mm, 168mm, 175mm, 180mm, 190mm, or 200mm.

[0102] In some possible embodiments, see Figures 1 to 4 As shown, the synchronous transmission mechanism 400 includes an eighth rotating wheel 417, and the section of the first transmission belt 410 located between the pretensioning device 500 and the first rotating wheel 411 is wound around the eighth rotating wheel 417 for guidance.

[0103] Combination Figure 2The eighth rotating wheel 417 is located to the left of the first rotating wheel 411 along the first direction X. By setting the section of the first transmission belt 410 between the pretensioning device 500 and the first rotating wheel 411 to be wound around the eighth rotating wheel 417, the first transmission belt 410 can be guided. On the one hand, the extension direction of the first transmission belt 410 can be adjusted, the wrap angle of the first transmission belt 410 on the first rotating wheel 411 can be expanded, and the contact area between the first transmission belt 410 and the first rotating wheel 411 can be increased, thereby improving the transmitted torque and reducing pressure concentration. On the other hand, it can ensure that the first transmission belt 410 maintains an angle close to perpendicular to the horizontal plane when it exits from the ninth rotating wheel 510 (mentioned below) of the pretensioning device 500, avoiding interference wear between the first transmission belt 410 and the plate in the exit area of ​​the pretensioning device 500, thereby extending the service life of the synchronous transmission mechanism 400 and making its transmission function stable.

[0104] Optionally, the fourth rotating wheel 414, the third rotating wheel 413, and the eighth rotating wheel 417 are all smooth guide wheels. The guide wheels do not have a meshing tooth structure, and the first transmission belt 410 can be guided by the fourth rotating wheel 414, the third rotating wheel 413, and the eighth rotating wheel 417 together.

[0105] In some possible embodiments, see Figures 1 to 6 As shown, the pretensioning device 500 includes a ninth rotating wheel 510 and a wheel frame 520; the ninth rotating wheel 510 is rotatably mounted in the wheel frame 520, and the wheel frame 520 is offset to the side that tensions at least one of the first drive belt 410 and the second drive belt 420.

[0106] The pretensioning device 500 is used to tension at least one of the first transmission belt 410 and the second transmission belt 420; that is, the pretensioning device 500 can be disposed on the first transmission belt 410, which is wound around the ninth rotating pulley 510. The pretensioning device 500 can also be disposed on the second transmission belt 420, which is wound around the ninth rotating pulley 510. Alternatively, one pretensioning device 500 can be disposed on each of the first transmission belt 410 and the second transmission belt 420, with the first transmission belt 410 wound around the ninth rotating pulley 510 of one pretensioning device 500 and the second transmission belt 420 wound around the ninth rotating pulley 510 of the other pretensioning device 500.

[0107] For the sake of simplicity, the following description will use the example of the pretensioning device 500 being mounted on the first transmission belt 410. However, it should be understood that the pretensioning device 500 can also be mounted on the second transmission belt 420, with the same structure and operating principle.

[0108] In this configuration, the first transmission belt 410 is wound around the ninth rotating wheel 510. The wheel frame 520 can be offset to the side that tensions the first transmission belt 410, thereby allowing the ninth rotating wheel 510 to provide tension to the first transmission belt 410. This ensures that the first transmission belt 410 remains continuously tensioned, preventing slackness. This effectively improves the transmission slack problem caused by long-term stress deformation, material creep, and mechanical wear in the synchronous transmission mechanism 400 in related technologies. It ensures that the bottom light device 300 and the probe 200 can maintain a precise displacement synchronization relationship during synchronous movement along the first direction X, thereby ensuring that the fixed bridge image measuring instrument has high measurement accuracy.

[0109] In some possible embodiments, see Figures 1 to 4 As shown, the pre-tightening device 500 also includes a stop 530, an elastic part 540, and at least one guide part 550; the roller frame 520 is slidably disposed on the guide part 550; the elastic part 540 elastically abuts between the stop 530 and the roller frame 520 to drive the roller frame 520 to shift away from the stop 530.

[0110] Since the stop 530 is located between the pulley frame 520 and the synchronous transmission mechanism 400, it can drive the pulley frame 520 to shift away from the synchronous transmission mechanism 400. That is, in this embodiment, when the pretensioning device 500 is provided on the first transmission belt 410, shifting the pulley frame 520 away from the stop 530 can move it away from the first transmission belt 410, thereby tensioning the first transmission belt 410; similarly, when the pretensioning device 500 is provided on the second transmission belt 420, shifting the pulley frame 520 away from the stop 530 can move it away from the second transmission belt 420, thereby tensioning the second transmission belt 420.

[0111] The baffle 530 can be an L-shaped baffle, made of aluminum alloy or stainless steel, which has good structural strength and light weight.

[0112] When the pretensioning device 500 is installed on the first transmission belt 410, the stop 530 and the crossbeam 610 can be fixedly connected by bolts or other structures. When the pretensioning device 500 is installed on the second transmission belt 420, the stop 530 and the base 100 can be fixedly connected by bolts or other structures.

[0113] The guide portion 550 can be a slide rail, guide groove, guide post, or limiting plate, etc. By setting the guide portion 550, the degree of freedom of the wheel frame 520 can be restricted, thereby restricting the direction of movement of the wheel frame 520 and ensuring that the wheel frame 520 is offset away from the synchronous transmission mechanism 400.

[0114] The elastic part 540 elastically abuts against the stop 530 and the rotating wheel frame 520, thereby applying an elastic force to the rotating wheel frame 520 to drive it away from the stop 530, thus allowing the ninth rotating wheel 510 to provide tension to the first transmission belt 410. In this way, when the first transmission belt 410 becomes loose, the elastic part 540 drives the rotating wheel frame 520 to shift further away, ensuring that the first transmission belt 410 remains continuously taut and preventing slack. This effectively improves the transmission slack problem in the synchronous transmission mechanism 400 caused by long-term stress deformation, material creep, and mechanical wear in related technologies, ensuring that the bottom light device 300 and the probe 200 maintain a precise displacement synchronization relationship during synchronous movement along the first direction X, thereby ensuring that the fixed bridge image measuring instrument has high measurement accuracy.

[0115] In some possible embodiments, see Figures 1 to 6 As shown, the guide part 550 is a guide post, and the wheel frame 520 has a guide hole (not shown) that mates with the guide part 550; the elastic part 540 is sleeved on the guide part 550.

[0116] Specifically, the guide portion 550 passes through the wheel frame 520, and the wheel frame 520 can slide on the guide post. By setting the guide portion 550 to be inserted into the guide hole, the degree of freedom of the wheel frame 520 can be restricted, thereby limiting the direction of movement of the wheel frame 520 and ensuring that the wheel frame 520 is offset to the side away from the synchronous transmission mechanism 400.

[0117] The elastic part 540 can be a spring. By fitting the elastic part 540 onto the guide part 550 and elastically abutting between the stop part 530 and the wheel frame 520, space can be effectively utilized, the structure can be simplified, and the elastic part 540 can be positioned to prevent it from loosening.

[0118] Optionally, the ninth rotating wheel 510 is a toothed rotating wheel; in this way, the ninth rotating wheel 510 can easily mesh with the first transmission belt 410 / second transmission belt 420 for transmission, and the transmission is more precise.

[0119] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A synchronous transmission mechanism, characterized in that, The synchronous transmission mechanism (400) includes a first transmission belt (410), a second transmission belt (420), a transmission shaft (430), and a pretensioning device (500). The drive shaft (430) has a sixth rotating wheel (431) and a seventh rotating wheel (432) of equal diameter at both ends; the first drive belt (410) meshes with the sixth rotating wheel (431) for transmission; the second drive belt (420) meshes with the seventh rotating wheel (432) for transmission. The first transmission belt (410) includes a first part (415) and a second part (416), wherein the first part (415) and the second part (416) are respectively a distant section away from the sixth rotating wheel (431) and a close section close to the sixth rotating wheel (431) when the first transmission belt (410) rotates clockwise around the sixth rotating wheel (431); The second transmission belt (420) includes a third part (422) and a fourth part (423); the third part (422) and the fourth part (423) are respectively a distant section of the second transmission belt (420) away from the seventh rotating wheel (432) and a close section of the second transmission belt (420) towards the seventh rotating wheel (432) when the second transmission belt (420) rotates clockwise around the seventh rotating wheel (432); The first part (415) of the first transmission belt (410) is connected to the probe (200), and the third part (422) of the second transmission belt (420) is connected to the bottom light device (300); or, the second part (416) of the first transmission belt (410) is connected to the probe (200), and the fourth part (423) of the second transmission belt (420) is connected to the bottom light device (300). The pretensioning device (500) is used to tension at least one of the first drive belt (410) and the second drive belt (420).

2. The synchronous transmission mechanism according to claim 1, characterized in that, The synchronous transmission mechanism (400) includes a first rotating wheel (411), a second rotating wheel (412), a third rotating wheel (413), and a fourth rotating wheel (414); the first rotating wheel (411) and the fourth rotating wheel (414) are located at the same end along a first direction (X), and the first rotating wheel (411) is higher than the fourth rotating wheel (414) along a third direction (Z); the second rotating wheel (412) and the third rotating wheel (413) are both located at the same other end along the first direction (X), and the second rotating wheel (412) is higher than the third rotating wheel (413) along the third direction (Z). The section of the first transmission belt (410) above the first rotating wheel (411) and the second rotating wheel (412) is the first part (415), and the section of the first transmission belt (410) below the third rotating wheel (413) and the fourth rotating wheel (414) is the second part (416). The third direction (Z) is set to intersect with the first direction (X).

3. The synchronous transmission mechanism according to claim 2, characterized in that, One end of the first transmission belt (410) is connected to one side of the probe (200), and the other end of the first transmission belt (410) is sequentially wound around the second rotating wheel (412), the transmission shaft (430), the third rotating wheel (413), the fourth rotating wheel (414) and the first rotating wheel (411), and is connected to the other side of the probe (200). The pretensioning device (500) is disposed on the section of the first transmission belt (410) located between the fourth rotating wheel (414) and the first rotating wheel (411).

4. The synchronous transmission mechanism according to claim 2, characterized in that, The bottom light device (300) includes a slider (310), a light source (320), and a slide rail (330). The light source (320) is fixedly connected to the slider (310), and the slide rail (330) is disposed in the base (100) along the first direction (X). The slider (310) is slidably connected to the slide rail (330). The synchronous transmission mechanism (400) includes a fifth rotating wheel (421), and the fifth rotating wheel (421) and the transmission shaft (430) are distributed on both sides of the base (100) along the first direction (X); One end of the second transmission belt (420) is wound around the fifth rotating wheel (421), and the other end is connected to the transmission shaft (430) for transmission. The section of the second transmission belt (420) above the fifth rotating wheel (421) and the transmission shaft (430) is the third part (422), and the section of the second transmission belt (420) below the fifth rotating wheel (421) and the transmission shaft (430) is the fourth part (423). The slider (310) is fixedly connected to the second transmission belt (420).

5. The synchronous transmission mechanism according to claim 1, characterized in that, The first transmission belt (410) is a synchronous belt, a belt, a steel belt, or a transmission rope; and / or, The second transmission belt (420) is a synchronous belt, belt, steel belt or transmission rope.

6. The synchronous transmission mechanism according to claim 2, characterized in that, The synchronous transmission mechanism (400) includes an eighth rotating wheel (417), and the first transmission belt (410) is wound around the eighth rotating wheel (417) in the section between the pretensioning device (500) and the first rotating wheel (411).

7. The synchronous transmission mechanism according to claim 6, characterized in that, The fourth rotating wheel (414), the third rotating wheel (413), and the eighth rotating wheel (417) are all smooth guide wheels; and / or, The first rotating wheel (411) and the second rotating wheel (412) are rotating wheels with toothed structures.

8. The synchronous transmission mechanism according to any one of claims 1 to 7, characterized in that, The pre-tightening device (500) includes a ninth rotating wheel (510) and a wheel frame (520); The ninth rotating wheel (510) is rotatably mounted in the wheel frame (520), which is capable of shifting toward at least one of the first drive belt (410) and the second drive belt (420).

9. The synchronous transmission mechanism according to claim 8, characterized in that, The pre-tightening device (500) further includes a stop (530), an elastic part (540), and at least one guide part (550). The wheel frame (520) is slidably disposed on the guide portion (550); The elastic part (540) elastically abuts between the stop (530) and the wheel frame (520) to drive the wheel frame (520) to shift away from the stop (530).

10. A fixed bridge-type image measuring instrument, characterized in that, include: Base (100); The probe (200) is movably arranged above the base (100) along a first direction (X); A bottom light device (300) is movably disposed within the base (100) along the first direction (X); And a synchronous transmission mechanism (400) as described in any one of claims 1 to 9, the synchronous transmission mechanism (400) being used to drive the bottom light device (300) and the probe (200) to move synchronously in a first direction (X).

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