Length measuring device

Abstract

The utility model relates to the technical field of measuring equipment, and particularly discloses a length measuring device which comprises a base, a first adjusting mechanism, a shooting mechanism, a second adjusting mechanism and a clamping mechanism. The first adjusting mechanism comprises a vertical moving assembly, a horizontal moving assembly and a rotary sliding table assembly, and the vertical moving assembly is arranged on the base; the driving end of the vertical moving assembly is connected to the horizontal moving assembly; the driving end of the horizontal moving assembly is connected to the rotary sliding table assembly; the driving end of the rotary sliding table assembly is connected to the shooting mechanism; the second adjusting mechanism is arranged on the base; the driving end of the second adjusting mechanism is connected to the clamping mechanism; the clamping mechanism comprises a mouse table and two opposite clamping jaws which are movably arranged on the mouse table in the horizontal direction, and the two clamping jaws can get close to each other to clamp a mouse. The length measuring device can measure the length of the long and short axes of the mouse tumor, and is high in measuring precision, high in measuring efficiency, convenient to operate and use and high in applicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to measuring equipment technical field especially relates to a length measuring device. BACKGROUND

[0002] The research of tumor is the focus in the biomedical field, and the animal model, especially the mouse model, is an indispensable tool for preclinical research. In the evaluation of drug efficacy and the study of tumor biology, tumor volume measurement is one of the important indicators to measure tumor growth rate and treatment effect. Therefore, it is crucial to measure the volume of mouse tumor in vivo quickly and accurately to obtain reliable and effective experimental data.

[0003] Currently, the length and short axis of the tumor are measured to estimate the tumor volume. In the prior art, the experimenter uses a handheld measuring tool such as a vernier caliper or a digital caliper to manually measure the long axis and short axis of the mouse tumor. After obtaining the data, the experimenter substitutes it into the calculation formula to calculate the approximate value of the tumor volume indirectly. However, this testing method is inefficient and has a large human error, which easily affects the accuracy of the data. SUMMARY

[0004] The utility model aims at providing a length measuring device to solve the problem of low testing efficiency and large human error of handheld measuring tools in the prior art, which easily affects the accuracy of the data.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a length measuring device for measuring the tumor length of a mouse, which comprises a base and:

[0007] A first adjusting mechanism and a shooting mechanism, the first adjusting mechanism comprises a vertical moving assembly, a horizontal moving assembly and a rotating sliding table assembly, the vertical moving assembly is arranged on the base; the driving end of the vertical moving assembly is connected to the horizontal moving assembly for driving the horizontal moving assembly to move in the vertical direction; the driving end of the horizontal moving assembly is connected to the rotating sliding table assembly for driving the rotating sliding table assembly to move in the horizontal direction; the driving end of the rotating sliding table assembly is connected to the shooting mechanism for driving the shooting mechanism to swing in the vertical plane;

[0008] The second adjusting mechanism is arranged on the base; the driving end of the second adjusting mechanism is connected to the clamping mechanism for adjusting the spatial position of the clamping mechanism; the clamping mechanism comprises a mouse table and two oppositely arranged clamping jaws arranged on the mouse table and movable along the horizontal direction, and the two clamping jaws can be close to each other to clamp the mouse; the clamping mechanism and the shooting mechanism are oppositely arranged.

[0009] As an optional solution of the length measuring device, the clamping jaws are arranged along an arc shape, and the two clamping jaws can be relatively arranged to form a shuttle-shaped structure; both ends of the clamping jaws are provided with tooth claws, and the tooth claws of the two clamping jaws are arranged in a staggered manner.

[0010] As an optional solution of the length measuring device, the clamping mechanism further comprises a fastener, the mouse table is provided with a plurality of guide positioning grooves arranged side by side, the fastener can be detachably connected to one of the guide positioning grooves through the clamping jaw, and the clamping jaw is further provided with a guide protrusion which can be embedded in another one of the guide positioning grooves.

[0011] As an optional solution of the length measuring device, the clamping mechanism further comprises a soft member arranged on the inner side of the clamping jaw; the soft member is provided with a profiling groove, and the profiling grooves of the soft members on the two clamping jaws are oppositely arranged.

[0012] As an optional solution of the length measuring device, the shooting mechanism comprises a camera and a telecentric lens, the camera is arranged at the driving end of the rotating slide assembly, and the telecentric lens is arranged at the camera.

[0013] As an optional solution of the length measuring device, the base comprises a lower support table and an upper support table arranged above the lower support table, the upper support table is provided with a through hole, the first adjusting mechanism is arranged on the upper support table, and the second adjusting mechanism is arranged on the lower support table opposite to the through hole.

[0014] As an optional solution of the length measuring device, the length measuring device further comprises an illumination mechanism, the illumination mechanism comprises a plastic hose and an illuminating lamp, one end of the plastic hose is arranged on the base, and the other end of the plastic hose is connected to the illuminating lamp.

[0015] As an optional solution of the length measuring device, the vertical moving assembly and the horizontal moving assembly are both ball screw slides.

[0016] As an optional solution of the length measuring device, the second adjusting mechanism is a six-degree-of-freedom motion platform.

[0017] As an alternative to the length measuring device described above, the length measuring device further comprises a foot switch, which is communicatively connected to the shooting mechanism.

[0018] The length measuring device has the following advantages:

[0019] The length measuring device comprises a base, a first adjusting mechanism, a shooting mechanism, a second adjusting mechanism and a clamping mechanism. The first adjusting mechanism comprises a vertical moving assembly, a horizontal moving assembly and a rotating sliding table assembly. The vertical moving assembly is arranged on the base. The driving end of the vertical moving assembly is connected to the horizontal moving assembly, which is used to drive the horizontal moving assembly to move in the vertical direction. The driving end of the horizontal moving assembly is connected to the rotating sliding table assembly, which is used to drive the rotating sliding table assembly to move in the horizontal direction. The driving end of the rotating sliding table assembly is connected to the shooting mechanism, which is used to drive the shooting mechanism to swing in the vertical plane. Thus, the height of the shooting mechanism can be adjusted by the vertical moving assembly, the horizontal position of the shooting mechanism can be adjusted by the horizontal moving assembly, and the shooting angle of the shooting mechanism can be adjusted by the rotating sliding table assembly. Furthermore, the shooting field of view and the viewing angle of the shooting mechanism can be adjusted by the cooperation of the vertical moving assembly, the horizontal moving assembly and the rotating sliding table assembly. Meanwhile, the second adjusting mechanism is arranged on the base. The driving end of the second adjusting mechanism is connected to the clamping mechanism, which is used to adjust the spatial position of the clamping mechanism. The clamping mechanism comprises a mouse platform and two oppositely arranged clamping jaws arranged on the mouse platform and moving in the horizontal direction. The two clamping jaws can be close to each other to clamp the mouse. The clamping mechanism and the shooting mechanism are arranged opposite to each other. Thus, the posture of the mouse on the mouse platform can be adjusted by the second adjusting mechanism, and the mouse can be fixed by the two clamping jaws and the mouse platform, so that the mouse tumor can be better exposed for the shooting mechanism to shoot the mouse. The length measuring device can measure the major and minor axis lengths of the mouse tumor by adjusting the shooting position and the shooting angle of the shooting mechanism by the first adjusting mechanism, adjusting the position and the angle of the mouse by the second adjusting mechanism, and adjusting the posture of the mouse by the clamping mechanism. For different mouse postures and tumor positions, the shooting angle can be adjusted to the best shooting angle, which ensures the accuracy and precision of the measurement image, the efficiency and repeatability of the shooting, and realizes high-throughput continuous measurement, thereby meeting the needs of large-scale tumor experimental research. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The length measuring device provided by the embodiment of the utility model has the advantages of:

[0021] Figure 2 The length measuring device provided by the embodiment of the utility model has the advantages of:

[0022] In the drawings:

[0023] 1, base; 11, lower support table; 12, upper support table; 121, through hole; 2, first adjusting mechanism; 21, vertical moving assembly; 22, horizontal moving assembly; 23, rotating slide assembly; 3, shooting mechanism; 31, camera; 32, telecentric lens; 4, second adjusting mechanism; 5, clamping mechanism; 51, mouse table; 511, guide positioning groove; 52, clamping jaw; 521, tooth claw; 522, guide protrusion; 53, fastener; 54, soft body; 541, profiling groove; 6, lighting mechanism; 61, plastic hose; 62, illuminating lamp. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "upper", "above" and "on" of the first feature relative to the second feature include the vertical height of the first feature being higher than the second feature. The "below", "below" and "below" of the first feature relative to the second feature include the vertical height of the first feature being lower than the second feature.

[0026] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used for explaining the present application, and should not be understood as limiting the present application.

[0028] As shown in Figure 1 and Figure 2 The present embodiment provides a length measuring device for measuring the long and short axes of a mouse tumor.

[0029] The length measuring device comprises a base 1, a first adjusting mechanism 2, a shooting mechanism 3, a second adjusting mechanism 4 and a clamping mechanism 5. The first adjusting mechanism 2 comprises a vertical moving assembly 21, a horizontal moving assembly 22 and a rotating slide rail assembly 23, the vertical moving assembly 21 is arranged on the base 1, the driving end of the vertical moving assembly 21 is connected to the horizontal moving assembly 22 for driving the horizontal moving assembly 22 to move in the vertical direction, the driving end of the horizontal moving assembly 22 is connected to the rotating slide rail assembly 23 for driving the rotating slide rail assembly 23 to move in the horizontal direction, the driving end of the rotating slide rail assembly 23 is connected to the shooting mechanism 3 for driving the shooting mechanism 3 to swing in the vertical plane, so that the height of the shooting mechanism 3 can be adjusted by the vertical moving assembly 21, the horizontal position of the shooting mechanism 3 can be adjusted by the horizontal moving assembly 22, and the shooting angle of the shooting mechanism 3 can be adjusted by the rotating slide rail assembly 23, and then the shooting field of view and the viewing angle of the shooting mechanism 3 can be adjusted by the cooperation of the vertical moving assembly 21, the horizontal moving assembly 22 and the rotating slide rail assembly 23.

[0030] Meanwhile, the second adjusting mechanism 4 is arranged on the base 1, the driving end of the second adjusting mechanism 4 is connected to the clamping mechanism 5 for adjusting the spatial position of the clamping mechanism 5, the clamping mechanism 5 comprises a mouse table 51 and two oppositely arranged clamping jaws 52 arranged on the mouse table 51 and moving in the horizontal direction, the two clamping jaws 52 can be close to each other to clamp the mouse, the clamping mechanism 5 and the shooting mechanism 3 are arranged oppositely, so that the posture of the mouse on the mouse table 51 can be adjusted by the second adjusting mechanism 4, and the mouse can be fixed by the two clamping jaws 52 and the mouse table 51, so that the mouse tumor can be better exposed for the shooting mechanism 3 to shoot the mouse. Optionally, the mouse table 51 is coated with a non-slip coating, so that the mouse can be prevented from sliding on the mouse table 51 by the non-slip coating.

[0031] In the utility model, the "spatial position" refers to the specific position and posture of the clamping mechanism 5 (namely the mouse table 51 and the clamping jaw 52) in the three-dimensional space, including the translational position in the X, Y and Z three coordinate axis directions and the rotation angle (namely the pitch, yaw and roll angle) around the X axis, Y axis and Z axis. Through the adjustment of the second adjusting mechanism 4 (such as a six-degree-of-freedom motion platform), the flexible positioning and posture setting of the clamping mechanism 5 in the above six degrees of freedom can be realized, thereby meeting the fine adjustment requirements of the mouse body position and the exposed area of the tumor under different experimental requirements.

[0032] The length measuring device can measure the major and minor axis lengths of the mouse tumor through the adjustment of the shooting position and shooting angle of the shooting mechanism 3 by the first adjusting mechanism 2, the adjustment of the mouse position and angle by the second adjusting mechanism 4 and the adjustment of the mouse posture by the clamping mechanism 5, has high measurement accuracy, high measurement efficiency, convenient operation and use and strong applicability, can adjust the shooting angle to the best under the condition of reducing the operation burden of the experimental personnel for different mouse body positions and tumor positions, guarantees the accuracy and precision of the measured image and the efficiency and repeatability of the shooting, and further realizes high-throughput continuous measurement, thereby meeting the demand of large-scale tumor experimental research.

[0033] Specifically, the vertical moving assembly 21 and the horizontal moving assembly 22 are both ball screw slides, so that the accurate movement of the shooting mechanism 3 can be realized through the ball screw slide. Optionally, the ball screw slide is an electric ball screw slide or a manual ball screw slide, and the position of the shooting mechanism 3 is adjusted by electricity or manually according to the requirement. Further optionally, the horizontal moving assembly 22 is an XY-axis ball screw slide. Meanwhile, the second adjusting mechanism 4 is a six-degree-of-freedom motion platform, so that the flexible adjustment of the clamping mechanism 5 in multiple degrees of freedom can be realized through the setting of the six-degree-of-freedom motion platform, the complex posture adjustment required by the mouse tumor shooting is met, the position data can be fed back in real time through the six-degree-of-freedom motion platform, the closed-loop control is realized, the six-degree-of-freedom motion platform has the closed-loop position teaching function, the position and angle of the mouse table 51 can be adjusted by the experimental personnel through dragging, and it is ensured that the tumor area can always meet the best shooting condition.

[0034] Further, the base 1 comprises a lower support table 11 and an upper support table 12 arranged above the lower support table 11, the upper support table 12 is provided with a through hole 121, the first adjusting mechanism 2 is arranged on the upper support table 12, and the second adjusting mechanism 4 is arranged on the lower support table 11 opposite to the through hole 121, so that the space of the length measuring device can be reasonably utilized by arranging the second adjusting mechanism 4 on the lower support table 11 of the base 1, and the space utilization rate is improved.

[0035] As Figure 2As shown, the clamping jaws 52 extend along an arc shape, and the two clamping jaws 52 can be relatively arranged to form a shuttle-shaped structure, so that when the two clamping jaws 52 are close to each other to hold and fix the mouse, the shooting mechanism 3 can shoot the mouse from the shuttle-shaped hole between the two clamping jaws 52, thereby avoiding the clamping jaws 52 from blocking the mouse and affecting the shooting effect, and the two ends of the clamping jaws 52 are provided with tooth claws 521, and the tooth claws 521 of the two clamping jaws 52 are arranged in a staggered manner, so that through the cooperation of the tooth claws 521 on the two clamping jaws 52, the limbs and head of the mouse can be locked, and the influence on shooting caused by the forced movement of the mouse can be avoided. Among them, the clamping mechanism 5 further comprises a soft member 54, the soft member 54 is arranged on the inner side of the clamping jaw 52, and the soft member 54 is provided with a profiled groove 541, and the profiled grooves 541 of the soft members 54 on the two clamping jaws 52 are arranged oppositely, so that through the arrangement of the two soft members 54, the comfort of the mouse when being clamped and fixed can be improved, and the forced movement of the mouse without anesthesia can be prevented, and the profiled groove 541 cooperates with the deformation of the soft member 54 to tightly adhere to the mouse body during the fixing process, thereby providing a good clamping and fixing effect. Optionally, the soft member 54 is a sponge, which is soft and easy to clean, and is suitable for high-frequency experiments.

[0036] Further, the clamping mechanism 5 further comprises a fastener 53, and the mouse table 51 is provided with a plurality of side-by-side arranged guide positioning grooves 511, the fastener 53 can be detachably connected to one of the plurality of guide positioning grooves 511 through the clamping jaw 52, and the clamping jaw 52 is further provided with a guide protrusion 522, the guide protrusion 522 can be embedded in another one of the plurality of guide positioning grooves 511, so that through the use of the fastener 53, the clamping jaw 52 can be locked or released on the mouse table 51, and through the cooperation of the fastener 53 and the guide protrusion 522, the clamping jaw 52 can be stably moved along the guide positioning groove 511. Optionally, the fastener 53 comprises a screw and a nut, and the screw and the nut can lock the clamping jaw 52 on the mouse table 51. Further optionally, the mouse table 51 is hollow, and the nut can be placed in the hollow part of the mouse table 51.

[0037] As shown in the figure, Figure 1 The shooting mechanism 3 comprises a camera 31 and a telecentric lens 32, the camera 31 is arranged on the driving end of the rotating slide assembly 23, and the telecentric lens 32 is arranged on the camera 31. Through the cooperation of the camera 31 and the telecentric lens 32, the image distortion caused by the change of distance during imaging can be avoided under the condition of normal shooting, and the edge information of the tumor can be accurately captured, thereby providing high-quality pictures for subsequent length measurement and data analysis. Optionally, the length measurement device further comprises a foot switch, and the foot switch is communicatively connected to the shooting mechanism 3, so that the shooting function of the shooting mechanism 3 can be triggered through the foot switch, thereby freeing the hands of the experimenters, simplifying the operation process, and improving the work efficiency.

[0038] Further, the length measuring device further comprises an illumination mechanism 6, which comprises a plastic hose 61 and an illumination lamp 62, one end of the plastic hose 61 is arranged on the base 1, and the other end of the plastic hose 61 is connected to the illumination lamp 62, so that according to the shooting requirements, the illumination angle and distance of the illumination lamp 62 can be adjusted by pulling the plastic hose 61, ensuring that the mouse tumor area is uniformly illuminated, avoiding shadow interference, so as to facilitate the shooting mechanism 3 to obtain clear imaging effect.

[0039] In summary, the first adjusting mechanism 2 (camera 31 position and angle adjustment) and the second adjusting mechanism 4 (mouse movement and posture adjusting mouse platform 51) cooperate to realize high-precision and automated mouse tumor length and short axis measurement. The rotating slide assembly 23 in the first adjusting mechanism 2 can drive the shooting mechanism 3 (such as the camera 31 equipped with a telecentric lens 32) to swing flexibly in the vertical plane, so as to adjust the best shooting angle for different mouse positions and tumor positions, and ensure the accuracy and repeatability of the measurement image. The second adjusting mechanism 4 uses a six-degree-of-freedom motion platform to realize multi-dimensional spatial position and posture adjustment of the mouse clamping mechanism 5 (mouse platform 51 and clamping jaw 52), so that the mouse tumor can be fully exposed to the shooting field of view, and the clamping is stable and reliable, facilitating high-throughput continuous measurement.

[0040] At the same time, the six-degree-of-freedom motion platform is designed in combination with the first adjusting mechanism 2 with vertical swinging capability, so that the experimental personnel can flexibly adjust the relative spatial relationship between the camera 31 and the mouse according to the actual tumor position, realize tumor image collection in different directions and angles, significantly improve the applicability and data accuracy of the measurement, reduce the dependence on the operation experience of the experimental personnel, and greatly optimize the automation and standardization process of tumor measurement.

[0041] In addition, the length measuring device can realize shooting through external triggering modes such as foot switches, further freeing the hands of the experimental personnel, simplifying the operation, and improving the experimental efficiency. The overall structure is suitable for various mouse sizes and tumor positions, and has high precision, high efficiency and wide applicability.

[0042] In this embodiment, the steps of obtaining the length and short axis length of the mouse tumor according to the photographed image include:

[0043] S1, visual calibration.

[0044] Before measurement, the entire vision system needs to be calibrated to establish the conversion relationship between pixel coordinates and physical world coordinates. Specifically, a size known calibration board (such as a glass plate with precise grid or circle dots) is placed on the working distance, photographed by the shooting mechanism 3, and the processing module analyzes the image of the calibration board to calculate the actual physical size represented by each pixel (for example, the calibration coefficient is 0.01 mm / pixel). Among them, since the telecentric lens 32 is used, the pixel to millimeter calibration ratio is constant within a large depth of field range, which will not change due to the slight change of the working distance, thereby ensuring the measurement accuracy.

[0045] S2, image acquisition.

[0046] The experimenter triggers the shooting through the foot switch, and the image is captured by the camera 31 and transmitted to the processing module in real time.

[0047] S3, image processing and analysis.

[0048] S31, identify the tumor area. After receiving the image, the processing module runs the image processing algorithm to identify the contour of the tumor, which includes automatic identification and manual assistance. Among them, the automatic identification is to use edge detection algorithm (such as Canny, Sobel algorithm), threshold segmentation or deep learning model (such as U-Net) to automatically outline the boundary of the tumor, and the manual assistance is that the experimenter manually selects or corrects the contour of the tumor on the display through the mouse to deal with complex or unclear situations.

[0049] S32, calculate the long and short axes. After determining the tumor contour, the long and short axes of the tumor are automatically calculated by the calculation algorithm. Among them, the long axis is the longest distance between any two points in the contour, and the short axis is usually defined as the widest distance perpendicular to the long axis direction. Specifically, the calculation algorithm can use algorithms such as "rotating caliper method" to efficiently find the size, while allowing the experimenter to manually correct the position on the display through the mouse.

[0050] S4, length calculation and data output of long and short axes of tumor.

[0051] The processing module multiplies the pixel length of the long and short axes measured by the calibration coefficient (mm / pixel) obtained in step S1 vision calibration step, to calculate the actual physical length (millimeter) of the long and short axes of the tumor. The final result can be displayed on the screen and can be automatically saved to the database for subsequent tumor volume estimation (for example, using the formula V=(long axis x short axis²) ÷ 2) and data analysis.

[0052] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A length measuring device for measuring the length of a tumor in a mouse, characterized in that, The length measuring device comprises a base (1) and: A first adjusting mechanism (2) and a shooting mechanism (3), the first adjusting mechanism (2) comprises a vertical moving assembly (21), a horizontal moving assembly (22) and a rotating slide assembly (23), the vertical moving assembly (21) is arranged on the base (1); the driving end of the vertical moving assembly (21) is connected to the horizontal moving assembly (22) for driving the horizontal moving assembly (22) to move in the vertical direction; the driving end of the horizontal moving assembly (22) is connected to the rotating slide assembly (23) for driving the rotating slide assembly (23) to move in the horizontal direction; the driving end of the rotating slide assembly (23) is connected to the shooting mechanism (3) for driving the shooting mechanism (3) to swing in the vertical plane; A second adjusting mechanism (4) and a clamping mechanism (5), the second adjusting mechanism (4) is arranged on the base (1); the driving end of the second adjusting mechanism (4) is connected to the clamping mechanism (5) for adjusting the spatial position of the clamping mechanism (5); the clamping mechanism (5) comprises a mouse table (51) and two oppositely arranged clamping jaws (52) arranged on the mouse table (51) and moving in the horizontal direction, the two clamping jaws (52) can approach each other to clamp the mouse; the clamping mechanism (5) and the shooting mechanism (3) are arranged oppositely.

2. The length measuring device of claim 1, wherein, The clamping jaw (52) is arranged in an arc shape, and the two clamping jaws (52) can form a shuttle-shaped structure relative to each other; the two ends of the clamping jaw (52) are provided with tooth claws (521), and the tooth claws (521) of the two clamping jaws (52) are arranged alternately.

3. The length measuring device of claim 1, wherein, The clamping mechanism (5) further comprises a fastener (53), the mouse table (51) is provided with a plurality of guide positioning grooves (511) arranged side by side, the fastener (53) can be detachably connected to one of the plurality of guide positioning grooves (511) through the clamping jaw (52), and the clamping jaw (52) is further provided with a guide protrusion (522), and the guide protrusion (522) can be embedded in another one of the plurality of guide positioning grooves (511).

4. The length measuring device of claim 1, wherein, The clamping mechanism (5) further comprises a soft member (54), and the soft member (54) is arranged on the inner side of the clamping jaw (52); the soft member (54) is provided with a profiling groove (541), and the profiling grooves (541) of the soft members (54) on the two clamping jaws (52) are arranged oppositely.

5. The length measuring device of claim 1, wherein, The shooting mechanism (3) comprises a camera (31) and a telecentric lens (32), the camera (31) is arranged at the driving end of the rotating slide assembly (23), and the telecentric lens (32) is arranged on the camera (31).

6. The length measuring device of claim 1, wherein, The base (1) comprises a lower support table (11) and an upper support table (12) arranged above the lower support table (11), the upper support table (12) is provided with a through hole (121), the first adjusting mechanism (2) is arranged on the upper support table (12), and the second adjusting mechanism (4) is arranged on the lower support table (11) opposite to the through hole (121).

7. The length measuring device of claim 1, wherein, The length measuring device further comprises an illumination mechanism (6), the illumination mechanism (6) comprises a plastic hose (61) and an illuminating lamp (62), one end of the plastic hose (61) is arranged on the base (1), and the other end of the plastic hose (61) is connected to the illuminating lamp (62).

8. The length measuring device of claim 1, wherein, The vertical moving assembly (21) and the horizontal moving assembly (22) are both ball screw sliding tables.

9. The length measuring device of claim 1, wherein, The second adjusting mechanism (4) is a six-degree-of-freedom motion platform.

10. The length measuring device according to any one of claims 1 to 9, characterized in that The length measuring device further comprises a foot switch, and the foot switch is in communication connection with the shooting mechanism (3).

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