A tree diameter measuring device

Abstract

The utility model relates to tree breast height diameter measurement technical field, concretely relates to a tree breast height diameter measuring device, and the device includes the main ruler, and the front and back are equipped with main ruler sliding slot and the ring respectively, two main ruler nested sliding blocks, two main ruler nested sliding blocks are along the length direction of main ruler and are slidably arranged, and the main ruler nested sliding block is equipped with horizontal bubble, and the middle is equipped with screw hole, two measuring ruler claws are detachably installed on two main ruler nested sliding blocks, the middle of measuring ruler claw is equipped with strip slide, and the clamping side of measuring ruler claw is equipped with laser reflection board slot, laser reflection board is inserted and installed in laser reflection board slot, two bolts, the screw rod end of bolt passes through strip slide and screw hole in proper order, and is installed on main ruler nested sliding block, breast height diameter point calibration ruler is hung on the ring, laser measuring instrument is installed on measuring ruler claw and is used for measuring the breast height diameter of the tree clamped between two measuring ruler claws. The device can realize the quick and accurate measurement of single person batch tree breast height diameter.

Description

Technical Field

[0001] This utility model relates to the field of tree diameter at breast height (DBH) measurement technology, specifically to a tree DBH measurement device. Background Technology

[0002] In forestry surveys, tree diameter at breast height (DBH, the diameter at 1.3m tree height) is a mandatory item. High-precision DBH measurement is essential for subsequent analyses such as stand growth evaluation, volume planning, and output value estimation. The accuracy of the numerical measurement and the efficiency of the measurement process are paramount in the entire forestry survey. Traditionally, DBH measurement is performed using a DBH measuring tape, but manual tape reading is slow, and different personnel have different estimation habits, easily leading to data inaccuracies. The manufacture of large digital vernier calipers for tree measurement has significantly improved the reading efficiency of DBH measurement. However, the increased overall size, heavier material, and integrated structure of these calipers result in a large footprint and inconvenience in carrying them. Furthermore, while large digital vernier calipers are expensive, their applicability is limited, often for a single purpose, thus restricting the instrument's usability. Meanwhile, both diameter-at-breast-meter (DBH) measuring rods and tree-measuring vernier calipers require additional personnel to monitor and record data at a tree height of 1.3m, resulting in significant manpower consumption. The introduction of handheld / backpack-type lidar and airborne radar has greatly facilitated the implementation of large-scale forest surveys, maximizing measurement efficiency, particularly beneficial for large-scale forestry planning surveys and design development. However, these devices are expensive (approximately 200,000-300,000 RMB per unit), limiting their widespread application. They are also heavy and less portable. Furthermore, their accuracy in identifying DBH still differs from actual DBH measurements, especially for small-diameter trees, where deviations can exceed 2-3 cm. Therefore, the development and training of high-precision point cloud data analysis models are still necessary. This project requires significant funding and skilled personnel, and widespread application is still some time away.

[0003] Therefore, there is an urgent need for a portable and universal tree diameter-at-breast-length (DBH) measuring device to quickly and efficiently achieve accurate measurement of tree DBH, while reducing capital investment and labor costs. Utility Model Content

[0004] This invention aims to address the problems of poor portability, high purchase cost, low measurement efficiency, low measurement accuracy, and high personnel consumption in existing tree diameter-at-breast-length (DBH) measuring equipment, and provides a tree DBH measuring device.

[0005] To achieve the above objectives, this utility model provides a tree diameter at breast height (DBH) measuring device, which includes:

[0006] The main ruler has main ruler sliding grooves on both sides of the front and hanging rings on the back.

[0007] Two main scale nested sliders are provided, which are slidably arranged along the length direction of the main scale. The lower two sides of the support surface of the main scale nested slider are provided with nested sliding surfaces that fit with the main scale sliding groove. Limiting parts are provided at the four corners of the upper part, and a threaded hole is opened in the middle.

[0008] A bubble level is provided on at least one of the main scale nested sliders for adjusting the level of the main scale;

[0009] Two measuring jaws are respectively inserted into the support surface of the two main scale nested sliders along the width direction of the main scale by the limiting member. A strip-shaped slide is opened in the middle of the measuring jaws, and a laser reflector slot is opened on the trunk clamping side of at least one of the measuring jaws.

[0010] A laser reflector plate is fitted to the measuring jaws and vertically inserted into the laser reflector plate slot.

[0011] Two bolts, the screw ends of which pass through the strip-shaped slide and the threaded hole in sequence, are used to mount the measuring scale claw on the main scale nested slider;

[0012] A diameter at breast height (DBH) calibration ruler is detachably hung on the hanging ring and used to mark the location of the DBH measurement point on a tree.

[0013] A laser measuring instrument, mounted on the measuring jaws, is used to measure the diameter at breast height (DBH) of a tree held between the two measuring jaws.

[0014] Preferably, the bottom of the nested sliding surface is provided with several arc-shaped grooves, and ball bearings are embedded inside the arc-shaped grooves. The bottom of the nested sliding surface and the main scale sliding groove are slidably connected by the ball bearings.

[0015] Preferably, the laser reflector is provided with a plurality of target points for correcting the laser emitted by the laser measuring instrument so that it is directed perpendicularly toward the laser reflector.

[0016] Preferably, it also includes a measuring instrument fixing bolt, which is disposed in the strip-shaped slide of the measuring scale jaw and is used to limit the installation of the laser measuring instrument.

[0017] Preferably, it also includes a laser measuring instrument mounting bracket, which is integrally formed with any one of the measuring jaws to form a T-shape. The laser measuring instrument mounting bracket has a measuring instrument mounting slide in the middle. The measuring instrument mounting slide is perpendicularly connected to the strip slide of the measuring jaw. The measuring instrument mounting slide is equipped with a fixing bolt for limiting the installation of the laser measuring instrument.

[0018] The laser measuring instrument mounting bracket has multiple through slots spaced apart on both sides. Based on the through slots, the laser measuring instrument can be installed and limited by binding.

[0019] The measuring ruler claw is connected to the tree trunk clamping side of the laser measuring instrument mounting frame, and multiple limiting protrusions are provided at intervals to limit the horizontal movement of the laser measuring instrument.

[0020] Preferably, the main scale, the main scale nested slider, the measuring scale jaws, and the laser reflector are made of carbon fiber.

[0021] Preferably, it also includes a mobile phone, which is wirelessly connected to the laser measuring instrument to receive, edit, and store the tree diameter at breast height data measured in real time by the laser measuring instrument.

[0022] Preferably, it also includes a mobile phone fixing component, the mobile phone fixing component comprising:

[0023] The main scale is nested with a slider, which is slidably mounted on the main scale.

[0024] A phone holder that can be extended on both sides to hold a phone, and a screw hole is provided in the middle of the phone holder;

[0025] A fixing screw is used to mount the mobile phone holder onto the main ruler nested slider through the bracket screw hole.

[0026] Preferably, the diameter at breast height (DBH) calibration ruler is made of carbon fiber and includes:

[0027] A multi-segment calibration ruler is used to mark the location of the tree diameter at breast height (DBH) measurement point;

[0028] Multiple rotating retaining clips are used to connect the two sections of the calibration ruler;

[0029] A snap-on hook is attached to one end of the calibration ruler described in the first or last section, and is used to fasten onto the hanging ring.

[0030] Preferably, the main ruler has strap hanging holes at both ends along its length;

[0031] The tree diameter at breast height (DBH) measuring device also includes a portable component, which comprises:

[0032] strap;

[0033] An adjustable hand buckle is installed on the shoulder strap and is used to adjust the length of the shoulder strap that forms a loop;

[0034] A strap buckle hook is provided on the strap and is used to fasten the strap to the strap hanging hole.

[0035] Compared with existing technologies, this invention offers the following advantages: The device employs an assembled structure, with each component being detachable and easy to store. It is robust, lightweight, and space-efficient, making it highly portable. Each functional unit is independent, resulting in low maintenance and repair costs. Furthermore, it can be disassembled for secondary applications, leading to a wide range of potential applications and high equipment utilization. Through the coordinated operation of modules such as diameter at breast height (DBH) point marking and positioning, main scale clamping, laser measurement, and Bluetooth transmission, this device enables a single person to quickly and accurately obtain batch DBH measurements. Practical measurements have demonstrated that the data obtained using this device differs from classic DBH measurements by only ±1cm, achieving significant data consistency. In summary, this device boasts advantages such as high measurement accuracy, high efficiency, high portability, low production cost, low maintenance cost, and wide applicability, providing significant convenience for forestry surveys. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the tree diameter at breast height (DBH) measuring device;

[0037] Figure 2 This is a schematic diagram of the main scale slide of the tree diameter at breast height measuring device;

[0038] Figure 3 This is a schematic diagram of the main scale nested with a slider in this tree diameter at breast height (DBH) measuring device;

[0039] Figure 4 This is a schematic diagram of the laser measuring instrument, laser reflector, and mobile phone used in this tree diameter at breast height (DBH) measuring device.

[0040] Figure 5 This is a portable structural diagram of the tree diameter at breast height (DBH) measuring device;

[0041] Figure 6 This is a schematic diagram of the diameter-at-breast-length (DBH) point calibration ruler of this tree diameter-at-breast-length (DBH) measuring device;

[0042] Figure 7 This is a schematic diagram of the structure of the tree diameter at breast height (DBH) measuring device when the measuring jaw and the laser measuring instrument mounting frame are integrally formed;

[0043] Figure 8 This is a comparison chart of tree diameter at breast height (DBH) data measured using the tree DBH measuring device described in this utility model and tree DBH data measured using a DBH ruler.

[0044] Figure 9 This is a distribution map showing the difference between the tree diameter at breast height (DBH) measurement device described in this utility model and the tree DBH data measured using a DBH ruler.

[0045] Explanation of reference numerals in the attached figures

[0046] 1. Main scale; 2. Shoulder strap hanging hole; 3. Main scale slide groove; 4. Hanging ring; 5. Inner buckle surface; 6. Edge protrusion; 7. Main scale nested slider; 8. Support surface; 9. Nested slide surface; 10. Limiting component; 11. Threaded hole; 12. Ball bearing; 13. Level bubble; 14. Measuring scale jaw; 15. Laser reflector slot; 16. Bolt; 17. Strip slide; 18. Measuring instrument fixing bolt; 19. Fixing screw; 20. Mobile phone holder; 21. Holder screw hole; 22. Laser measuring instrument; 23. Laser reflector; 24. Mobile phone; 25. Shoulder strap buckle hook; 26. Adjustable hand buckle; 27. Shoulder strap; 28. Buckle hook; 29. ​​Rotary fixing buckle; 30. Calibration scale; 31. Laser measuring instrument mounting bracket; 32. Measuring instrument mounting slide; 33. Fixing bolt; 34. Through slot; 35. Limiting protrusion. Detailed Implementation

[0047] The following provides a detailed description of the specific embodiments of this utility model. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this utility model.

[0048] In the description of this application, the term "comprising" and any variations thereof are meant to mean non-exclusively including, possibly including, or adding one or more other features, units, components and / or combinations thereof.

[0049] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] This utility model provides a device for measuring the diameter at breast height (DBH) of trees, such as... Figures 1-7 As shown, the tree diameter at breast height (DBH) measuring device includes:

[0051] Main ruler 1, with main ruler grooves 3 on both sides of the front and hanging rings 4 on the back;

[0052] Two main scale nested sliders 7 are slidably arranged along the length direction of the main scale 1. The support surface 8 of the main scale nested slider 7 is provided with nested sliding surfaces 9 on both sides of the lower part that fit with the main scale sliding groove 3. Limiting parts 10 are provided on the four corners of the upper part, and a threaded hole 11 is opened in the middle.

[0053] A bubble level 13 is provided on at least one of the main scale nested sliders 7 for adjusting the level of the main scale 1.

[0054] Two measuring jaws 14 are respectively inserted into the support surface 8 of the two main ruler nested sliders 7 along the width direction of the main ruler 1 by the limiting member 10. A strip-shaped slide 17 is opened in the middle of the measuring jaw 14. The measuring jaw 14 can slide left and right according to the thickness of the target tree during the diameter at breast height measurement, and the length of the measuring jaw 14 inserted into the tree can be flexibly adjusted to ensure effective clamping. At least one of the measuring jaws 14 has a laser reflector slot 15 on the clamping side.

[0055] The laser reflector 23 is fitted to the measuring jaw 14 and vertically inserted into the laser reflector slot 15.

[0056] Two bolts 16, the screw ends of which pass through the strip slide 17 and the threaded hole 11 in sequence, to install the measuring scale claw 14 on the main scale nested slider 7;

[0057] A diameter at breast height (DBH) calibration ruler is detachably hung on the hanging ring 4 and is used to mark the location of the DBH measurement point on the tree.

[0058] A laser measuring instrument 22, mounted on the measuring jaws 14, is used to measure the diameter at breast height (DBH) of a tree held between the two measuring jaws 14.

[0059] Both the main scale 1 and the measuring jaw 14 have graduation lines. The measuring jaw 14 can be vertically fixed to the main scale 1 using the main scale nested slider 7, threaded hole 11, and bolt 16. The main scale 1 has "U"-shaped main scale grooves 3 on both sides, formed by an inner buckling surface 5 and a side protrusion 6. A micro-expansion rubber gasket is provided at the bottom of the threaded hole 11. When the bolt 16 is tightened to its lowest position, it pushes the rubber gasket down to press against the main scale 1, ensuring that the main scale nested slider 7 and its support are firmly fixed to the main scale 1. When the bolt 16 is moderately tightened, it allows the main scale nested slider 7 and its support to slide flexibly along the length of the main scale 1 within the main scale groove 3.

[0060] According to the above technical solution, this tree diameter at breast height (DBH) measuring device, through the coordinated action of the main scale, the DBH calibration scale, and the bubble level, enables rapid and uniform calibration of the DBH points on trees. Through the coordinated action of the main scale, the main scale nested slider, the bubble level, the measuring scale jaws, the laser emitting plate, the bolts, and the laser measuring instrument, efficient measurement of the DBH of trees of various specifications can be achieved using the laser measuring instrument. This device also has the advantages of low production cost, high measurement efficiency, and good portability.

[0061] In one specific implementation, such as Figure 3As shown, the limiting member 10 is an L-shaped limiting member, with its short side vertically connected to the upper four corners of the support surface 8, and its long side positioned opposite and parallel to the support surface 8. This allows the measuring jaw 14 to be inserted into the support surface 8 in an orientation relatively perpendicular to the main ruler 1. Simultaneously, the strip-shaped slide 17 in the middle of the measuring jaw 14 allows for flexible adjustment of the length distribution of the measuring jaw 14 relative to both sides of the main ruler, ensuring the clamping depth on the tree and forming an effective clamp. In another specific embodiment, the limiting member 10 can also be a miniature strip-shaped protrusion, used in conjunction with the bolt 16 to limit the load.

[0062] In another specific implementation, such as Figure 1 As shown, the bubble level 13 can also be installed on the front of the main scale 1. However, directly installing it on the front of the main scale 1 would prevent the main scale 1 from being used at its full range and would affect the convenience of its splicing. Therefore, in this invention, it is preferable to install the bubble level 13 on the main scale nested slider 7. The specific number installed can be set according to actual application needs. Preferably, as shown... Figure 1 As shown, it is typically installed on the main scale nested slider 7, which is used to insert the measuring scale jaw 14 with the laser reflector slot 15.

[0063] In some preferred embodiments, such as Figure 2 As shown, the bottom of the nested sliding surface 9 has several arc-shaped grooves, and ball bearings 12 are embedded inside the arc-shaped grooves. The bottom of the nested sliding surface 9 and the main scale slide groove 3 are slidably connected by the ball bearings 12, so that the main scale nested slider 7 can slide more flexibly along the main scale slide groove 3 of the main scale 1. Specifically, when it is necessary to make the main scale nested slider 7 reach the upper limit of the main scale 1, the bolt 16 can be tightened. Because a micro-telescopic rubber gasket is provided at the bottom of the threaded hole 11, when the bolt 16 is tightened to the bottom, it can push the rubber gasket down and abut against the main scale 1, ensuring that the main scale nested slider 7 and its carrier are firmly fixed on the main scale 1. Overall, the position adjustment of the measuring jaw 14 required for measurement can be easily achieved by adjusting the tightness of the bolt 16 and pushing the ball bearings 12 of the main scale nested slider 7 to slide.

[0064] The number of arc-shaped grooves at the bottom of the nested sliding surface 9 can be customized according to actual needs. In one specific embodiment, such as... Figure 2 As shown, one is set at each of the four corners of the bottom of the nested sliding surface 9.

[0065] In some preferred embodiments, the laser reflector 23 is provided with a plurality of alignment target points for calibrating the laser emitted by the laser measuring instrument 22 so that it is directed perpendicularly towards the laser reflector 23. Specifically, the installation orientation of the laser measuring instrument 22 can be adjusted in conjunction with the scale markings on the main scale 1 so that the laser measuring instrument 22 is mounted perpendicularly on the measuring scale jaw 14, and the laser emitted by it is also directed perpendicularly towards the laser reflector 23, thereby forming an effective reflection, thus improving the laser detection accuracy and reducing measurement errors.

[0066] Furthermore, several target points are arranged at intervals along the horizontal and vertical sides, with the horizontal interval being the same as the interval between the scale lines on the measuring jaw 14. This allows for better calibration of the laser measuring instrument 22 and ensures that the laser emitted by it is directed perpendicularly to the laser reflector 23, thus forming an effective reflection.

[0067] In some preferred embodiments, such as Figure 1 As shown, the tree diameter at breast height (DBH) measuring device also includes a measuring instrument fixing bolt 18, which is disposed within the strip-shaped slide 17 of the measuring jaw 14 and is used to limit the installation of the laser measuring instrument 22. In practical applications, it has been found that some commercially available laser measuring instruments 22 have threaded mounting holes at their bottom. Using the measuring instrument fixing bolt 18 and the strip-shaped slide 17 of the measuring jaw 14, the laser measuring instrument 22 can be quickly installed on the measuring jaw 14.

[0068] In practical applications, it has been found that although the laser measuring instrument 22 can be directly mounted on the measuring jaw 14 using the measuring instrument fixing bolt 18, the installation position of the laser measuring instrument 22 can only be adjusted horizontally based on the strip slide 17. This necessitates limiting the size of the laser measuring instrument to ensure that its laser emission point (generally located at the top of the laser measuring instrument) is flush with the trunk clamping edge of the measuring jaw 14. Only in this way can the measured value of the laser measuring instrument be consistent with the actual value of the tree's diameter at breast height (DBH). Otherwise, it is necessary to first collect data to establish a fitting model between the measured value and the actual value, and the DBH value needs to be obtained through model conversion in subsequent measurements.

[0069] To broaden the applicability of this device and simplify the data analysis process, therefore, in some other preferred embodiments, such as Figure 7As shown, the tree diameter at breast height (DBH) measuring device also includes a laser measuring instrument mounting frame 31, which is integrally formed with any one of the measuring jaws 14 to form a T-shape. A measuring instrument mounting slide 32 is provided in the middle of the laser measuring instrument mounting frame 31. The measuring instrument mounting slide 32 is perpendicularly connected to the strip slide 17 of the measuring jaw 14. A fixing bolt 33 is installed on the measuring instrument mounting slide 32 for limiting the installation of the laser measuring instrument 22. In practical applications, referring to the dimensions of a custom laser measuring instrument, the fixing bolt 33 can be used to adjust the horizontal and vertical positions of the laser measuring instrument 22 relative to the measuring jaw 14 through the T-shaped channel formed by the perpendicular connection between the measuring instrument mounting slide 32 and the strip slide 17 of the measuring jaw. This ensures that the laser emission point of the laser measuring instrument 22 is flush with the trunk clamping edge of the measuring jaw 14, thus making the measured value of the laser measuring instrument 22 the actual DBH value of the tree, facilitating data statistics.

[0070] In practical applications, it has been found that some commercially available laser measuring instruments 22 do not have pre-drilled mounting holes at the bottom, making it impossible to install and fix them using the fixing bolts 33. To further solve this problem and improve the versatility of this device, a more preferred embodiment is that the laser measuring instrument mounting bracket 31 has multiple through slots 34 spaced apart on both sides. The laser measuring instrument 22 can be installed and limited by binding using the through slots 34, thereby expanding its compatibility with various types of laser measuring instruments.

[0071] More preferably, the measuring jaw 14 is provided with a plurality of limiting protrusions 35 at intervals on the tree clamping side connected to the laser measuring instrument mounting bracket 31, preferably two, for horizontally limiting the laser measuring instrument 22, thereby enabling the laser emission point of the laser measuring instrument 22 to be flush with the edge of the tree clamping side of the measuring jaw 14.

[0072] In some preferred embodiments, such as Figure 4 As shown, the tree diameter at breast height (DBH) measuring device also includes a mobile phone 24, which is wirelessly connected to the laser measuring instrument 22. The mobile phone 24 receives real-time DBH data measured by the laser measuring instrument 22 and edits and stores the data according to statistical objectives, such as numbering. Other electronic devices with data receiving and editing functions can also be used. Specifically, a Bluetooth module can be used for data reception. The reason for preferring a mobile phone is its small size, light weight, and excellent portability. Furthermore, smartphones are widely used and have powerful editing functions. Wireless connection to the mobile phone allows for real-time reception and saving of the measurement data from the laser measuring instrument 22, and allows for editing such as numbering and tree type labeling, greatly facilitating subsequent analysis.

[0073] In one specific implementation, such as Figure 1 As shown, the tree diameter at breast height (DBH) measuring device also includes a mobile phone fixing component, which includes:

[0074] The main scale is nested with a slider 7, which is slidably mounted on the main scale 1;

[0075] A mobile phone holder 20 that can be extended on both sides to hold a mobile phone, and a bracket screw hole 21 is provided in the middle of the mobile phone holder 20;

[0076] Fixing screw 19 is used to install the mobile phone bracket 20 onto the main ruler nested slider 7 through the bracket screw hole 21.

[0077] In this embodiment of the invention, other sliding structures can also be used to achieve the sliding connection of the phone holder 20 on the main ruler 1. When the main ruler nested slider 7 is used, based on the structure of the phone holder 20, the limiting member 10 on the support surface 8 of the main ruler nested slider 7 can be removed, thereby better installing the phone holder 20. Preferably, after the phone holder 20 is installed on the support surface of the main ruler nested slider 7 using the fixing screw 19, the end of the fixing screw 19 is flush with the support surface of the phone holder 20, so that no protrusion is formed, which would affect the installation of the phone. The phone holder 20 can directly adopt various commonly used phone holders with telescopic clamping functions in the prior art. During the measurement process, the phone 24 can be installed on the phone holder or not. If the phone is not installed on the phone holder, the phone fixing component does not need to be installed on the main ruler 1.

[0078] In some preferred embodiments, such as Figure 6 As shown, the diameter at breast height (DBH) calibration ruler includes:

[0079] The multi-segment calibration ruler 30, with graduations, is used to mark the location of the tree diameter at breast height (DBH) measurement point;

[0080] Multiple rotating retaining buckles 29 are used for connecting the two sections of the calibration ruler 30;

[0081] A snap-on hook 28 is attached to one end of the first or last calibration ruler 30 and is used to fasten onto the hanging ring 4.

[0082] In some other preferred embodiments, the diameter-to-thickness (DBH) calibration ruler is made of high-density carbon fiber to reduce weight and improve portability.

[0083] In this embodiment of the invention, the vertical length of the unfolded calibration ruler 30 is 1.3m, enabling rapid and uniform calibration of standard tree diameter at breast height (DBH) measurement points. The final length of the calibration ruler can be selected according to the specific measurement target. Dividing the calibration ruler 30 into multiple segments facilitates portability. The number of rotating fixing buckles 29 is always one less than the number of segments of the calibration ruler 30.

[0084] In some other preferred embodiments, the diameter at breast height (DBH) calibrator may also be a 1.3m long plumb line ruler.

[0085] In some preferred embodiments, the tree diameter at breast height (DBH) measuring device includes, but is not limited to, the main ruler 1, the main ruler nested slider 7, the measuring ruler claw 14, and the laser reflector 23, which are made of plastic or carbon fiber, preferably high-density carbon fiber, thereby reducing the weight of the device while ensuring its structural strength, making it easy to carry and operate by a single person.

[0086] In some preferred embodiments, such as Figure 5 As shown, the main ruler 1 has strap hanging holes 2 at both ends along its length.

[0087] The tree diameter at breast height (DBH) measuring device also includes a portable component, which comprises:

[0088] Strap 27;

[0089] An adjustable buckle 26 is mounted on the shoulder strap 27 and is used to adjust the length of the shoulder strap 27, which forms a loop.

[0090] A strap buckle hook 25 is provided on the strap 27 and is used to fasten the strap 27 to the strap hanging hole 2.

[0091] In this embodiment of the utility model, by opening strap hanging holes 2 at both ends of the main ruler 1 and further matching it with the portable device, it can be carried by a single person diagonally when traveling, and can be hung around the neck when measuring, which can provide convenience for practical applications.

[0092] In one specific embodiment, the main scale 1 has a length of 50cm, a scale surface width of 3cm, a scale area length of 45cm, a groove bottom width of 1cm, an inner buckle surface 5 width of 1cm, and a side protrusion 6 height of 2mm. The measuring jaw 14 has a total length of 25cm, a total scale length of 24cm, and a thickness of 0.5cm.

[0093] In this embodiment of the utility model, the size design of the main ruler 1 and the measuring jaw 14 is for easy carrying and use by a single person. If the diameter at breast height of the tree to be measured is large (more than 45cm), multiple main rulers 1 can be used in series with the main ruler nested slider 7, or a larger size of the main ruler 1 and the measuring jaw 14 can be used directly for measurement.

[0094] The working principle and usage of the tree diameter at breast height (DBH) measuring device of this utility model are as follows: To facilitate the description of the measurement process, the components with the same name in the device are numbered sequentially from top to bottom. Specifically, the first main scale nested slider and the second main scale nested slider correspond to... Figure 1 The upper and lower main scale nested sliders 7. Similarly, the first measuring scale jaw is installed on the first main scale nested slider, the second measuring scale jaw is installed on the second main scale nested slider, the first bolt is installed on the first main scale nested slider, and the second bolt is installed on the second main scale nested slider.

[0095] like Figures 1-6 As shown, the measuring jaw 14, the diameter at breast height (DBH) calibration ruler, the laser measuring instrument 22, and the mobile phone 24 are installed one by one onto the main ruler 1 to assemble the tree DBH measuring device; the laser reflector 23 is vertically inserted into the laser reflector slot 15 of the measuring jaw 14; and the laser measuring instrument 22 and the mobile phone 24 are paired via Bluetooth so that the tree DBH data measured by the laser measuring instrument 22 can be transmitted to the mobile phone in real time.

[0096] When measuring the diameter at breast height (DBH) of a tree, firstly, according to the DBH of the tree to be measured, push the first main scale nested slider to slide the first measuring scale jaw to a suitable position on the main scale 1. Then, push and pull the first measuring scale jaw along the strip-shaped slide 17 of the first measuring scale jaw so that the length of the jaw clamping the trunk is as close as possible to 1 / 2 DBH depth. Tighten the first bolt to limit the position and ensure that the first measuring scale jaw is stably fixed. Then, adjust the position of the second measuring scale jaw in the same way to align it with the two ends of the first measuring scale jaw. Finally, adjust the fixed orientation of the laser measuring instrument 22 so that its laser emission point is aligned with the clamping side of the second measuring scale jaw. The edges are flush, and the laser can be perpendicularly projected onto the target point of the laser reflector 23. Adjust the second bolt to maintain 50% sliding flexibility of the second main scale nested slider. Next, based on the vertical positioning of the diameter at breast height (DBH) calibration ruler, determine the 1.3m height of the tree trunk, push the second main scale nested slider to make the first measuring scale claw and the second measuring scale claw engage and adhere tightly to the bark, forming a close clamping fit, and adjust the main scale 1 horizontally based on the level bubble 13. Finally, click the laser measuring instrument 22 to emit the laser, and use the mobile phone 24 to receive the measured tree DBH data and save the current measurement data. Repeat the above operation steps as needed to complete the batch measurement and recording of tree DBH.

[0097] Furthermore, to verify the practical effect of the tree diameter at breast height (DBH) measuring device, this application compared the accuracy of the tree DBH data obtained based on the device with that obtained based on a classic DBH ruler. For example... Figure 8 As shown, the 110 sets of comparative data are evenly distributed on both sides of the X=Y line, and Figure 9 The results show that the difference between the two measurements is within ±1 cm, and the statistical significance is P = 0.114 > 0.05. This indicates that the data measured by this device is significantly consistent with the data measured by the classic thorax gauge, with no statistically significant difference. This demonstrates the high measurement accuracy of this device and directly proves its superiority in terms of practical accuracy and efficiency.

[0098] The tree diameter at breast height (DBH) measuring device provided by this utility model adopts an assembled structure, with each component being detachable and easy to store. The device is robust, lightweight, and space-saving, offering excellent portability. Each functional unit is independent, resulting in low maintenance and replacement costs. Furthermore, it can be disassembled for secondary applications, offering numerous potential application scenarios and high equipment utilization. Through the coordinated operation of modules such as DBH point marking and ruler positioning, main ruler clamping, laser measurement, and Bluetooth transmission, this device enables a single person to quickly and accurately obtain batch DBH measurements. Practical measurements have confirmed that the data obtained using this device differs from classic DBH ruler data by only ±1cm, demonstrating significant data consistency. In summary, this device boasts advantages such as high measurement accuracy, high measurement efficiency, high portability, low production cost, low maintenance cost, and wide applicability, providing significant convenience for forestry surveys.

[0099] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed by this utility model and all fall within the protection scope of this utility model.

Claims

1. A device for measuring tree diameter at breast height (DBH), characterized in that, The tree diameter at breast height (DBH) measuring device includes: Main ruler (1), the main ruler (1) has main ruler sliding grooves (3) on both sides of the front side and hanging rings (4) on the back side; Two main scale nested sliders (7) are provided. The two main scale nested sliders (7) are slidably arranged along the length direction of the main scale (1). The support surface (8) of the main scale nested slider (7) is provided with nested sliding surfaces (9) that fit with the main scale slide groove (3) on both sides of the lower part. Limiting parts (10) are provided on the four corners of the upper part. A threaded hole (11) is opened in the middle. A bubble level (13) is provided on at least one of the main scale nested sliders (7) for adjusting the level of the main scale (1); Two measuring jaws (14) are respectively inserted into the support surface (8) of the two main scale nested sliders (7) along the width direction of the main scale (1) by the limiting member (10). A strip-shaped slide (17) is opened in the middle of the measuring jaw (14), and a laser reflector slot (15) is opened on the trunk clamping side of at least one of the measuring jaws (14). The laser reflector (23) fits the measuring jaw (14) and is vertically inserted into the laser reflector slot (15); Two bolts (16), the screw ends of the bolts (16) passing through the strip slide (17) and the threaded hole (11) in sequence, install the measuring scale claw (14) on the main scale nested slider (7); A diameter at breast height (DBH) calibrator is detachably hung on the hanging ring (4) and used to mark the location of the DBH measurement point of the tree; A laser measuring instrument (22), mounted on the measuring jaws (14), is used to measure the diameter at breast height of a tree held between the two measuring jaws (14).

2. The tree diameter at breast height (DBH) measuring device according to claim 1, characterized in that, The bottom of the nested sliding surface (9) is provided with several arc-shaped grooves, and ball bearings (12) are embedded inside the arc-shaped grooves. The bottom of the nested sliding surface (9) and the main scale sliding groove (3) are slidably connected by the ball bearings (12).

3. The tree diameter at breast height (DBH) measuring device according to claim 1, characterized in that, The laser reflector (23) is provided with several target points to correct the laser emitted by the laser measuring instrument (22) so that it is directed perpendicularly toward the laser reflector (23).

4. The tree diameter at breast height (DBH) measuring device according to claim 1, characterized in that, It also includes a measuring instrument fixing bolt (18), which is set in the strip slide (17) of the measuring scale jaw (14) and is used to limit the installation of the laser measuring instrument (22).

5. The tree diameter at breast height (DBH) measuring device according to claim 1, characterized in that, It also includes a laser measuring instrument mounting bracket (31), which is integrally formed with any one of the measuring jaws (14) and forms a T-shape; the laser measuring instrument mounting bracket (31) has a measuring instrument mounting slide (32) in the middle, the measuring instrument mounting slide (32) is vertically connected to the strip slide (17) of the measuring jaw (14), and the measuring instrument mounting slide (32) is equipped with a fixing bolt (33) for installing and limiting the laser measuring instrument (22); The laser measuring instrument mounting bracket (31) has multiple through slots (34) spaced apart on both sides. Based on the through slots (34), the laser measuring instrument (22) is installed and limited by binding. The measuring jaw (14) is connected to the laser measuring instrument mounting bracket (31) and has multiple limiting protrusions (35) spaced apart on the tree clamping side for horizontal limiting of the laser measuring instrument (22).

6. The tree diameter at breast height (DBH) measuring device according to claim 1, characterized in that, The main scale (1), the main scale nested slider (7), the measuring scale jaw (14), and the laser reflector (23) are made of carbon fiber.

7. The tree diameter at breast height (DBH) measuring device according to claim 1, characterized in that, It also includes a mobile phone (24), which is wirelessly connected to the laser measuring instrument (22) to receive the tree diameter at breast height data measured in real time by the laser measuring instrument (22) and to edit and store it.

8. The tree diameter at breast height (DBH) measuring device according to claim 7, characterized in that, It also includes a mobile phone fixing component, which includes: The main scale is nested with a slider (7), which is slidably mounted on the main scale (1); A mobile phone holder (20) that can be extended on both sides to hold a mobile phone, wherein a bracket screw hole (21) is provided in the middle of the mobile phone holder (20); Fixing screw (19) is used to install the mobile phone bracket (20) on the main scale nested slider (7) through the bracket screw hole (21).

9. The tree diameter at breast height (DBH) measuring device according to claim 1, characterized in that, The diameter at breast height (DBH) marking scale is made of carbon fiber and includes: A multi-segment calibration ruler (30) is used to mark the location of the tree diameter measurement point; Multiple rotating retaining clips (29) are used for connecting the two sections of the calibration scale (30); A snap-on hook (28) is attached to one end of the first or last calibration ruler (30) and is used to fasten to the hanging ring (4).

10. The tree diameter at breast height (DBH) measuring device according to any one of claims 1-9, characterized in that, The main ruler (1) has strap hanging holes (2) at both ends along its length; The tree diameter at breast height (DBH) measuring device also includes a portable component, which comprises: Shoulder straps (27); An adjustable hand buckle (26) is installed on the shoulder strap (27) for adjusting the length of the shoulder strap (27) which is arranged in a loop; A strap buckle hook (25) is provided on the strap (27) for fastening the strap (27) to the strap hanging hole (2).

Images