Behavioral analysis platform based on infrared grating principle

Abstract

This invention provides a behavioral analysis stage based on the principle of infrared gratings. An adjustment bracket is located at one end of the base along the Y-axis, and a first adjustment serration structure is provided on the adjustment bracket along the Z-axis. An adjustment bracket is located at the other end of the base along the Y-axis, and a second adjustment serration structure is provided on the second adjustment bracket along the Z-axis. A first detection grating has a first left-limiting serration structure at one end along the Y-axis and a first right-limiting serration structure at the other end. A second detection grating has a second left-limiting serration structure at one end along the Y-axis and a second right-limiting serration structure at the other end. This invention achieves height adjustment of the two detection gratings through the serration structure, enabling higher adjustment accuracy and facilitating the disassembly of the detection gratings.

Description

Technical Field

[0001] This utility model relates to the field of animal experimental equipment technology, specifically to a behavioral analysis platform based on the principle of infrared grating. Background Technology

[0002] Currently, in the field of animal behavior research, devices based on video equipment for monitoring animal behavior are widely used. These devices mainly capture animal activity trajectories by shooting videos and processing and analyzing the video data. Their working principle involves placing a video camera around the experimental cage to capture the animal's behavior inside the cage from a certain angle, and then processing the captured video to capture the animal's motion information.

[0003] From a spatial coverage perspective, the interior space of experimental cages is relatively large. A video camera on only one side can only monitor some of the animal's behavior when it is close to that side. It is difficult to accurately capture behaviors that occur on the other side of the cage, in the corners, or in the central area. For example, when experimental animals are engaging in concealed foraging, resting, or social interactions on the side of the cage away from the video camera, a single-sided video camera cannot detect the changes in the animal's movements in time, resulting in these behavioral data not being recorded. If multiple video cameras are deployed, it will result in a large amount of video data being collected, and some of the data will overlap. In addition, the use of video cameras requires specific lighting conditions.

[0004] To address the aforementioned technical issues, an existing behavioral analysis platform uses an infrared grating for behavioral data acquisition. However, this platform has the infrared grating fixed on the base, making height adjustment impossible. Consequently, it is not suitable for experimental animals of different heights and body types, resulting in low practicality. Furthermore, the infrared grating is difficult to disassemble. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a behavioral analysis platform based on the principle of infrared grating.

[0006] According to the present invention, a behavioral analysis platform based on the principle of infrared grating includes:

[0007] Base;

[0008] The first adjustment bracket is disposed at one end of the base along the Y-axis direction, and the adjustment bracket is provided with a first adjustment serration structure along the Z-axis direction;

[0009] The second adjustment bracket is disposed at the other end of the base along the Y-axis direction, and the second adjustment bracket is provided with a second adjustment serration structure along the Z-axis direction.

[0010] A first detection grating, wherein a first left limiting sawtooth structure is provided at one end of the first detection grating along the Y-axis direction, and a first right limiting sawtooth structure is provided at the other end of the first detection grating along the Y-axis direction, and the first right limiting sawtooth structure can move on the first detection grating along the Y-axis direction.

[0011] The second detection grating has a second left limiting sawtooth structure at one end along the Y-axis and a second right limiting sawtooth structure at the other end along the Y-axis. The second right limiting sawtooth structure can move along the Y-axis on the second detection grating.

[0012] Wherein, the first left limiting sawtooth structure and the second left limiting sawtooth structure can mesh with the first adjusting sawtooth structure;

[0013] The first right limiting sawtooth structure and the second right limiting sawtooth structure can engage with the second adjusting sawtooth structure.

[0014] Preferably, a first fixing plate is provided at one end of the first detection grating along the Y-axis direction, and the first left limiting sawtooth structure is provided on the first fixing plate;

[0015] The other end of the first detection grating along the Y-axis is provided with a first movable plate and a first fastener. The first movable plate can move along the Y-axis on the first detection grating, and the first fastener can fix the first movable plate.

[0016] The first right limiting sawtooth structure is disposed on the first movable plate.

[0017] Preferably, the first movable plate is provided with a first waist-shaped groove, the length direction of the first waist-shaped groove is along the Y-axis direction;

[0018] The first fastener is a first fastening bolt, which passes through the first waist-shaped groove and is threadedly connected to the first detection grating.

[0019] Preferably, a second fixing plate is provided at one end of the second detection grating along the Y-axis direction, and the second left limiting sawtooth structure is provided on the second fixing plate;

[0020] The other end of the second detection grating along the Y-axis is provided with a second movable plate and a second fastener. The second movable plate can move on the second detection grating along the Y-axis, and the second fastener can fix the second movable plate.

[0021] The second right limiting serrated structure is disposed on the second movable plate.

[0022] Preferably, the second movable plate is provided with a second waist-shaped groove, the length direction of the second waist-shaped groove is along the Y-axis direction;

[0023] The second fastener is a second fastening bolt, which passes through the second waist-shaped groove and is threadedly connected to the second detection grating.

[0024] Preferably, the first detection grating is located below the second detection grating.

[0025] Preferably, the first detection grating is used for detection in the X-axis and Y-axis directions, and the second detection grating is used for detection in the Z-axis direction.

[0026] Preferably, the base is used to hold the feeding cage;

[0027] When the rearing cage is placed on the base, the first detection grating and the second detection grating surround the periphery of the rearing cage.

[0028] Preferably, the first detection grating is a rectangular frame structure, and the second detection grating is a rectangular frame structure missing one short side.

[0029] Preferably, the adjusting bracket is provided with a first scale line along the Z-axis direction, and the first scale line is provided adjacent to the first adjusting sawtooth structure;

[0030] The second adjustment bracket has a second scale line along the Z-axis direction, and the second scale line is located adjacent to the second adjustment sawtooth structure.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. This utility model uses two adjusting brackets with adjusting sawtooth structures on each bracket. Limiting sawtooth structures are provided at both ends of the detection grating. When adjusting the height, at the desired height position, first engage and fix the limiting sawtooth structure at one end of the detection grating with the adjusting sawtooth structure of one of the adjusting brackets. Then, align the limiting sawtooth structure at the other end of the detection grating with the adjusting sawtooth structure of the other adjusting bracket. Move the limiting sawtooth structure on the adjusting grating until it engages with the adjusting sawtooth structure, and fix it with fasteners. This completes the fixing of the detection grating. When the height needs to be adjusted again or disassembled, loosen the fasteners, move the limiting sawtooth structure, and then fix the detection grating at another height or disassemble it in the same way.

[0033] 2. The detection grating of the behavioral analysis table of this utility model can be height adjusted, thus making it suitable for experimental animals of different heights and body shapes. At the same time, the adjustment bracket is equipped with scale lines to facilitate height adjustment. The height corresponding to each saw tooth of the adjustment saw tooth structure is fixed and fixed by the saw tooth meshing method, which can greatly improve the accuracy of height adjustment.

[0034] 3. The detection grating of this utility model is fixed on the adjustment bracket by a sawtooth meshing method. By adjusting the movable limiting sawtooth structure, the meshing state can be disengaged, and the detection grating can be disassembled. Attached Figure Description

[0035] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0036] Figure 1 Schematic diagram of the three-dimensional structure of a behavioral analysis table based on the principle of infrared grating for placing the breeding cages. Figure 1 ;

[0037] Figure 2 Schematic diagram of the three-dimensional structure of a behavioral analysis table based on the principle of infrared grating for placing the breeding cages. Figure 2 ;

[0038] Figure 3 A front view of the behavior analysis table based on the principle of infrared grating where the feeding cage is placed;

[0039] Figure 4 A side view of a behavioral analysis table based on the principle of infrared grating for placing a feeding cage;

[0040] Figure 5 Rear view of a behavioral analysis table based on the principle of infrared grating for placing a feeding cage;

[0041] Figure 6 A top view of a behavioral analysis table based on the principle of infrared grating for placing the breeding cages;

[0042] Figure 7 An exploded diagram of a behavioral analysis table based on the principle of infrared grating for placing a breeding cage;

[0043] Figure 8 Side view of the first and second detection gratings Figure 1 ;

[0044] Figure 9 Schematic diagram of the three-dimensional structure of the first and second detection gratings Figure 1 ;

[0045] Figure 10Schematic diagram of the three-dimensional structure of the first and second detection gratings Figure 2 ;

[0046] Figure 11 Schematic diagram of the three-dimensional structure of the first and second detection gratings Figure 3 ;

[0047] Figure 12 Schematic diagram of the three-dimensional structure of the first and second detection gratings Figure 4 ;

[0048] Figure 13 This is a back view of the first and second detection gratings;

[0049] Figure 14 Side view of the first and second detection gratings Figure 2 ;

[0050] Figure 15 This is a schematic diagram of the scanning of the first detection grating;

[0051] Figure 16 This is a schematic diagram of the scanning of the second detection grating;

[0052] Figure 17 Schematic diagram of the three-dimensional structure of the breeding cage Figure 1 ;

[0053] Figure 18 Schematic diagram of the three-dimensional structure of the breeding cage Figure 2 ;

[0054] Figure 19 A three-dimensional structural diagram of the module locking knob, gas detection sampling tube, and feeding cage;

[0055] Figure 20 Side view of the module locking knob, gas detection sampling tube, and feeding cage.

[0056] The diagram shows:

[0057] Base 1 Second fixing plate 53

[0058] First adjusting bracket 2 Second movable plate 54

[0059] First adjusting sawtooth structure 21 Second waist-shaped groove 541

[0060] First scale mark 22 Second fastener 55

[0061] Second adjustment bracket 3 Second data power supply connection port 56

[0062] Second adjustment serrated structure 31 Feeding cage 6

[0063] Second scale mark 32, cover 61

[0064] First detection grating 4, feed hopper 611

[0065] First left limit sawtooth structure 41 Weighing module 612

[0066] First right limiting serrated structure 42 Weighing chamber 613

[0067] First fixing plate 43 Drinking water tank body 614

[0068] First movable plate 44 Temperature and humidity detection module 615

[0069] First waist-shaped groove 441 Motion distance detection module 616

[0070] First fastener 45, running wheel 617

[0071] First data power supply connection port 46 Module locking knob 618

[0072] Second detection grating 5 Gas detection sampling tube 619

[0073] Second left limiting sawtooth structure 51 Cage body 62

[0074] Second right limiting serrated structure 52 Detailed Implementation

[0075] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0076] Example

[0077] like Figures 1 to 20 As shown, this embodiment provides a behavioral analysis stage based on the principle of infrared grating, including: a base 1, a first adjustment bracket 2, a second adjustment bracket 3, a first detection grating 4, and a second detection grating 5.

[0078] An adjustment bracket 2 is located at one end of the base 1 along the Y-axis, and a first adjustment serration structure 21 is provided on the adjustment bracket 2 along the Z-axis. An adjustment bracket 3 is located at the other end of the base 1 along the Y-axis, and a second adjustment serration structure 31 is provided on the second adjustment bracket 3 along the Z-axis. A first detection grating 4 has a first left limiting serration structure 41 at one end along the Y-axis and a first right limiting serration structure 42 at the other end along the Y-axis. The first right limiting serration structure 42 can move along the Y-axis at the first detection grating. The second detection grating 4 moves along the Y-axis; one end of the second detection grating 5 along the Y-axis is provided with a second left limiting sawtooth structure 51, and the other end of the second detection grating 5 along the Y-axis is provided with a second right limiting sawtooth structure 52. The second right limiting sawtooth structure 52 can move along the Y-axis on the second detection grating 5; the first left limiting sawtooth structure 41 and the second left limiting sawtooth structure 51 can engage with the first adjusting sawtooth structure 21; the first right limiting sawtooth structure 42 and the second right limiting sawtooth structure 52 can engage with the second adjusting sawtooth structure 31.

[0079] The first detection grating 4 is located below the second detection grating 5. The first detection grating 4 is used for detection in the X-axis and Y-axis directions, and the second detection grating 5 is used for detection in the Z-axis direction. The base 1 is used to place the breeding cage 6; when the breeding cage 6 is placed on the base 1, the first detection grating 4 and the second detection grating 5 surround the periphery of the breeding cage 6.

[0080] The first detection grating 4 is a rectangular frame structure, and the second detection grating 5 is a rectangular frame structure missing one short side. The adjustment bracket 2 is provided with a first scale line 22 along the Z-axis direction, and the first scale line 22 is located adjacent to the first adjustment sawtooth structure 21; the second adjustment bracket 3 is provided with a second scale line 32 along the Z-axis direction, and the second scale line 32 is located adjacent to the second adjustment sawtooth structure 31.

[0081] A first fixed plate 43 is provided at one end of the first detection grating 4 along the Y-axis, and a first left limiting serrated structure 41 is provided on the first fixed plate 43. A first movable plate 44 and a first fastener 45 are provided at the other end of the first detection grating 4 along the Y-axis. The first movable plate 44 can move along the first detection grating 4 along the Y-axis, and the first fastener 45 can fix the first movable plate 44. A first right limiting serrated structure 42 is provided on the first movable plate 44. A first waist-shaped groove 441 is provided on the first movable plate 44, and the length direction of the first waist-shaped groove 441 is along the Y-axis. The first fastener 45 is a first fastening bolt, which passes through the first waist-shaped groove 441 and is threadedly connected to the first detection grating 4.

[0082] A second fixed plate 53 is provided at one end of the second detection grating 5 along the Y-axis, and a second left limiting serrated structure 51 is provided on the second fixed plate 53. A second movable plate 54 and a second fastener 55 are provided at the other end of the second detection grating 5 along the Y-axis. The second movable plate 54 can move along the Y-axis on the second detection grating 5, and the second fastener 55 can fix the second movable plate 54. A second right limiting serrated structure 51 is provided on the second movable plate 54. A second waist-shaped groove 541 is provided on the second movable plate 54, and the length direction of the second waist-shaped groove 541 is along the Y-axis. The second fastener 55 is a second fastening bolt, which passes through the second waist-shaped groove 541 and is threadedly connected to the second detection grating 5.

[0083] In this embodiment, the feeding cage 6 includes a cover 61 and a cage body 62. The cover 61 is provided with a feed compartment 611, a weighing module 612, a weighing chamber 613, a drinking water compartment 614, a temperature and humidity detection module 615, a movement distance detection module 616, a running wheel 617, a module locking knob 618, and a gas detection sampling tube 619.

[0084] The cover 61 is provided with a first mounting hole, a second mounting hole, a third mounting hole, a fourth mounting hole, and a fifth mounting hole. The feed compartment 611 is mounted on the cover 61 through the first mounting hole and locked in place by the module locking knob 618. The weighing module 612 and the weighing compartment 613 are assembled together, mounted on the cover 61 through the second mounting hole, and locked in place by the module locking knob 618. The drinking water compartment 614 is mounted on the cover 61 through the third mounting hole and locked in place by the module locking knob 618. The movement distance detection module 616 and the running wheel 617 are assembled together, mounted on the cover 61 through the fourth mounting hole, and locked in place by the module locking knob 618. The temperature and humidity detection module 615 is mounted on the cover 61 through the fifth mounting hole. The gas detection sampling tube 619 is located on the cover 61 and inside the cage 62.

[0085] like Figure 15 and Figure 16 As shown, Figure 15 The arrows in the figure indicate the scanning direction and area of ​​the first detection grating 4. The animal position is detected by alternating scanning along the X and Y axes. The left side of the figure shows the alternating scanning along the Y axis, and the right side shows the alternating scanning along the X axis. Figure 16 The arrows in the diagram indicate the scanning direction and area of ​​the second detection grating 5. The height and position of the animal being tested are detected by alternating scanning along the Z-axis. The diagram shows an alternating scanning along the Z-axis.

[0086] The first detection grating is located between the second detection grating and the base in the height direction; detection units are respectively arranged on the first detection grating along the X and Y directions, and a height triggering unit is arranged on the second detection grating; both the detection unit and the height triggering unit are infrared gratings; the infrared grating includes a transmitter and a receiver.

[0087] The rearing cage includes: a lid, a cage body, a feeding box, and a water box; the feeding box and water box are located inside the cage body, which is used to hold the laboratory animals. The cage body is transparent. A carbon dioxide meter is installed on the lid to measure the carbon dioxide concentration inside the cage. An oxygen meter is also installed on the lid to measure the oxygen concentration inside the cage.

[0088] The detection unit's recognition area covers the animal's activity area; when the animal is standing, the height-triggered unit's recognition area covers the animal's head area; infrared gratings are arranged along the X and Y directions on the first detection grating; infrared gratings are arranged along either the X or Y direction on the second detection grating; infrared gratings are evenly spaced on both the first and second detection gratings. A set of infrared gratings is arranged every 1–10 mm on both the first and second detection gratings.

[0089] The transmitter includes one or more infrared light-emitting diodes; the receiver includes one or more infrared photodiodes or phototransistors. The receiver with the infrared grating may have a bandpass filter, or a light shield may be provided on the receiver with the infrared grating.

[0090] The first and second detection gratings can acquire the coordinates (X, Y, Z) of the experimental animal. Based on the changes in coordinates, the behavioral information of the experimental animal can be analyzed. This process can be achieved based on existing software processing. The focus of this embodiment is to provide the hardware structure foundation.

[0091] Monitoring the activity of laboratory animals plays a crucial role in clinical research. By continuously monitoring the activity of laboratory animals over a long period, the overall metabolic levels of the animals can be analyzed and evaluated. This research is widely applied in: Western medicine drug discovery, screening of the activity of traditional Chinese medicine / ethnic medicines and their effective components, research on the etiology and pathogenesis of metabolic diseases, basic research in nutrition and lipid metabolism disorders, cardiovascular diseases, kinesiology, physiology, and related drug screening, and experimental research related to immune metabolism. It helps accelerate the efficiency of domestic research and development in drug discovery and metabolic optimization.

[0092] In existing technologies, it is difficult to accurately measure the activity level of laboratory animals over long periods of time solely through observation, including effective activity distance, effective activity frequency, and effective standing frequency. This requires a significant amount of time in practice, and observational monitoring suffers from low accuracy, human error, and the inability to perform quantitative analysis. Other methods, such as animal video activity monitoring, also have unresolved drawbacks: a) high cost, as video surveillance systems typically require more expensive hardware and higher power consumption; b) data processing, as large amounts of video data require powerful storage and processing capabilities, resulting in high data management costs; c) privacy and ethical concerns, as continuous video surveillance may raise privacy and ethical concerns in certain situations; and d) environmental adaptability, as video surveillance equipment may malfunction under extreme weather conditions.

[0093] Based on the structure of this embodiment, the breeding cage can be fully covered. Combined with existing data acquisition software, automatic and accurate data acquisition can be achieved. Compared with video acquisition, the amount of data collected is less and the requirements for lighting conditions are lower.

[0094] This embodiment achieves complete coverage of the experimental chamber by setting two rectangular infrared grating frames. One rectangular infrared grating frame covers the experimental chamber in the X and Y directions, while the other rectangular infrared grating frame covers the experimental chamber in the Z direction. Furthermore, the use of infrared grating frames does not have high requirements for lighting conditions.

[0095] In this embodiment, the height of the two rectangular infrared grating frames can be adjusted by adjusting the support, thus allowing for different heights to be adjusted according to the size of the experimental animals, making it suitable for experimental animals of different heights and greatly improving its practicality.

[0096] This embodiment uses an infrared grating frame to collect animal behavior, enabling omnidirectional collection. Compared with video recording of animal behavior, it has lower requirements for lighting, higher tolerance for complex environments within the cage, and generates much less data than video, making data processing easier.

[0097] This invention uses a sawtooth structure to adjust the height of the two detection gratings, which enables higher adjustment accuracy and facilitates the disassembly of the detection gratings.

[0098] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 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 this application.

[0099] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A behavioral analysis platform based on the principle of infrared gratings, characterized in that, include: Base (1); The first adjustment bracket (2) is disposed at one end of the base (1) along the Y-axis direction, and the adjustment bracket (2) is provided with a first adjustment sawtooth structure (21) along the Z-axis direction; The second adjustment bracket (3) is disposed at the other end of the base (1) along the Y-axis direction, and the second adjustment bracket (3) is provided with a second adjustment sawtooth structure (31) along the Z-axis direction; The first detection grating (4) has a first left limiting sawtooth structure (41) at one end along the Y-axis direction and a first right limiting sawtooth structure (42) at the other end along the Y-axis direction. The first right limiting sawtooth structure (42) can move along the Y-axis direction on the first detection grating (4). The second detection grating (5) has a second left limiting sawtooth structure (51) at one end along the Y-axis direction and a second right limiting sawtooth structure (52) at the other end along the Y-axis direction. The second right limiting sawtooth structure (52) can move along the Y-axis direction on the second detection grating (5). The first left limiting sawtooth structure (41) and the second left limiting sawtooth structure (51) can engage with the first adjusting sawtooth structure (21). The first right limiting sawtooth structure (42) and the second right limiting sawtooth structure (52) can engage with the second adjusting sawtooth structure (31).

2. The behavioral analysis platform based on the principle of infrared grating according to claim 1, characterized in that, The first detection grating (4) is provided with a first fixing plate (43) at one end along the Y-axis direction, and the first left limiting sawtooth structure (41) is provided on the first fixing plate (43); The first detection grating (4) is provided with a first movable plate (44) and a first fastener (45) at the other end along the Y-axis. The first movable plate (44) can move along the Y-axis on the first detection grating (4), and the first fastener (45) can fix the first movable plate (44). The first right limiting sawtooth structure (42) is disposed on the first movable plate (44).

3. The behavioral analysis platform based on the principle of infrared grating according to claim 2, characterized in that, The first movable plate (44) is provided with a first waist-shaped groove (441), and the length direction of the first waist-shaped groove (441) is along the Y-axis direction; The first fastener (45) is a first fastening bolt, which passes through the first waist-shaped groove (441) and is threadedly connected to the first detection grating (4).

4. The behavioral analysis platform based on the principle of infrared grating according to claim 1, characterized in that, The second detection grating (5) is provided with a second fixing plate (53) at one end along the Y-axis direction, and the second left limiting sawtooth structure (51) is provided on the second fixing plate (53); The second detection grating (5) is provided with a second movable plate (54) and a second fastener (55) at the other end along the Y-axis. The second movable plate (54) can move along the Y-axis on the second detection grating (5), and the second fastener (55) can fix the second movable plate (54). The second right limiting sawtooth structure (52) is disposed on the second movable plate (54).

5. The behavioral analysis platform based on the principle of infrared grating according to claim 4, characterized in that, The second movable plate (54) is provided with a second waist-shaped groove (541), the length direction of the second waist-shaped groove (541) is along the Y-axis direction; The second fastener (55) is a second fastening bolt, which passes through the second waist-shaped groove (541) and is threadedly connected to the second detection grating (5).

6. The behavioral analysis platform based on the principle of infrared grating according to claim 1, characterized in that, The first detection grating (4) is located below the second detection grating (5).

7. The behavioral analysis platform based on the principle of infrared grating according to claim 1, characterized in that, The first detection grating (4) is used for detection in the X-axis and Y-axis directions, and the second detection grating (5) is used for detection in the Z-axis direction.

8. The behavioral analysis platform based on the principle of infrared grating according to claim 1, characterized in that, The base (1) is used to place the feeding cage (6); When the breeding cage (6) is placed on the base (1), the first detection grating (4) and the second detection grating (5) surround the periphery of the breeding cage (6).

9. The behavioral analysis platform based on the principle of infrared grating according to claim 1, characterized in that, The first detection grating (4) is a rectangular frame structure, and the second detection grating (5) is a rectangular frame structure missing one short side.

10. The behavioral analysis platform based on the principle of infrared grating according to claim 1, characterized in that, The adjustment bracket (2) is provided with a first scale line (22) along the Z-axis direction, and the first scale line (22) is provided adjacent to the first adjustment sawtooth structure (21); The second adjustment bracket (3) is provided with a second scale line (32) along the Z-axis direction, and the second scale line (32) is provided adjacent to the second adjustment sawtooth structure (31).

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