A device for semi-automatically and accurately measuring the diameter at breast height of a tree in the field

Abstract

The application discloses a device for semi-automatically and accurately measuring the diameter at breast height of a forest tree in the wild, which comprises a positioning rod, a mounting plate, a measuring mechanism, a guiding mechanism and a abutting mechanism, the measuring mechanism comprises a measuring flexible ruler and a winding assembly, the guiding mechanism comprises an arc-shaped plate, a rotating assembly and a guiding rod, and the abutting mechanism comprises an abutting block, an abutting rod, a first moving assembly and a second moving assembly. The diameter at breast height of the forest tree at a standard height can be measured by using the positioning rod with an unchanged height, the accurate measurement of the diameter at breast height of the forest tree in the wild can be realized, the phenomenon that the diameter at breast height measurement result is different for different persons in the process of manually measuring the diameter at breast height of each tree can be avoided, the accuracy of the measurement data is influenced, the human operation error is reduced, the device body material is C element material, the device is relatively light, is convenient to carry in the wild, is simple to operate, can save the working time in the wild, and improves the working efficiency.

Description

Technical Field

[0001] This invention relates to the field of tree diameter at breast height (DBH) measurement technology, specifically a device for semi-automatic and accurate determination of DBH in forest trees in the field. Background Technology

[0002] In conducting forest ecosystem plant diversity surveys, tree diameter at breast height (DBH) is one of the important indicators for investigating the diversity of the forest canopy. DBH plays a crucial role in biomass estimation. By combining DBH with corresponding tree biomass models, the biomass distribution of forests can be estimated quickly and accurately, thereby enabling an effective assessment of the ecosystem cycle of the forest system.

[0003] Currently, the quadrat method is commonly used, where each tree within a quadrat is manually measured and its diameter at breast height (DBH) recorded. However, in practice, we have found that during manual measurement, the DBH results often vary depending on the operator, affecting the accuracy of the data. To address this issue, we are now providing a device for semi-automated and precise measurement of tree DBH in the field. Summary of the Invention

[0004] The purpose of this invention is to provide a device for semi-automatic and accurate measurement of tree diameter at breast height (DBH) in the field, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A device for semi-automatic and accurate determination of diameter at breast height (DBH) of trees in the field includes a positioning rod, a mounting plate, a measuring mechanism, a guiding mechanism, and a clamping mechanism. The mounting plate is fixed to one side of the top of the positioning rod; The measuring mechanism is located on the side of the mounting plate away from the positioning bar and is used to measure the diameter at breast height of trees. The measuring mechanism includes a measuring tape and a winding assembly. The winding assembly is fixed to the surface of the mounting plate and the measuring tape is wound up inside the winding assembly. The guiding mechanism is located on the side of the mounting plate away from the positioning bar and below the winding assembly. The guiding assembly includes an arc plate, a rotating assembly, and a guide rod. There are two sets of arc plates arranged symmetrically. One end of each set of arc plates is hinged to the surface of the mounting plate, and the other ends of the two sets of arc plates are connected by a snap-fit ​​assembly. The guide rod is fixed above the rotating assembly. The rotating assembly is located above the two sets of arc plates and is used to drive the guide rod to rotate. One end of the measuring tape extending out of the winding assembly is fitted onto the surface of the guide rod. The clamping mechanism includes a clamping block, a clamping rod, a first moving component, and a second moving component. There are several sets of clamping blocks. Each set of clamping blocks has a set of first moving components installed on one side. Each set of first moving components is installed on two sets of arc plates. There are two sets of clamping rods. Each set of clamping rods has a set of second moving components installed on one side. The two sets of second moving components are respectively installed on both sides of the winding component.

[0006] As a further aspect of the present invention: the winding assembly includes a winding box, a winding roller, a coil spring, and a strip groove; The winding box is fixed to the surface of the mounting plate, the winding roller is located inside the winding box, and both ends of the winding roller are rotatably connected to the winding box via bearings. The strip groove is opened on one side surface of the winding box. One end of the measuring tape is wound around the surface of the winding roller, and the other end of the measuring tape passes through the strip groove and is sleeved on the guide rod. The coil spring is provided in two sets. Both sets of coil springs are sleeved on the surface of the winding roller. The two sets of coil springs are symmetrically arranged on both sides of the measuring tape. The two ends of each set of coil springs are respectively fixed to the winding roller and the winding box.

[0007] As a further aspect of the present invention: the snap-fit ​​assembly includes a fixing block, a slot, and a pin; The fixing blocks are provided in two sets. The two sets of fixing blocks are respectively fixed to the bottom end of the two sets of arc plates and the end away from the mounting plate. One set of fixing blocks has a slot on one side, and the other set of fixing blocks has a plug that mates with the slot on one side.

[0008] As a further aspect of the present invention: the rotating assembly includes a sliding groove, an arc-shaped slider, a toothed ring, and a gear; The sliding groove is provided in two sets, and the two sets of sliding grooves are respectively opened at the top of the two sets of arc plates. Each set of sliding grooves has a set of arc sliders sliding inside, and each set of arc sliders has a set of toothed rings fixed at the top. A connecting component for connecting the two sets of arc sliders is provided between the ends of the two sets of arc sliders that are close to each other. The gear is located on one side of the gear ring and meshes with the gear ring. A motor is provided below the gear, and the output end of the motor is fixedly connected to the central shaft of the gear. A motor base is provided below the motor, and one end of the motor base is fixedly connected to an arc-shaped plate.

[0009] As a further embodiment of the present invention: the connecting component includes four sets of mounting slots, two sets of second magnet blocks, and two sets of first magnet blocks; Four sets of mounting slots are respectively opened at both ends of the two sets of arc-shaped sliders. The first magnet is installed inside the two sets of mounting slots on one set of arc-shaped sliders, and the second magnet is installed inside the two sets of mounting slots on the other set of arc-shaped sliders, which attracts the first magnet.

[0010] As a further aspect of the present invention: each group of first moving components includes a mounting bracket, a fixed cylinder, a piston, a moving rod, and a spring; The mounting bracket is fixed to one side of the arc-shaped plate, the fixed cylinder is fixed above the mounting bracket, the piston slides inside the fixed cylinder, the outer diameter of the piston matches the inner diameter of the fixed cylinder, the moving rod is fixed to one side of the piston, the end of the moving rod away from the piston extends out of the fixed cylinder and is fixedly connected to the pressing block, the spring is sleeved on the surface of the moving rod, and the two ends of the spring are fixedly connected to the piston and the fixed cylinder respectively. The end of the fixed cylinder away from the pressure block is equipped with an air-filling mechanism for pushing the piston to move.

[0011] As a further aspect of the present invention: the inflation mechanism includes an air pump, a hose, a delivery pipe, a connecting pipe, an air outlet pipe, and a valve; The air pump is fixed to one side of the top of the positioning rod. The output end of the air pump is connected to two sets of hoses. The other end of each set of hoses is connected to a set of delivery pipes. Each set of delivery pipes is connected to several sets of connecting pipes on one side. The other end of each set of connecting pipes is connected to the inner cavity of a set of fixed cylinders. Each set of delivery pipes is connected to an air outlet pipe at the end furthest from the hose, and each set of air outlet pipes is equipped with a valve for on / off switching.

[0012] As a further aspect of the present invention: each group of second moving components includes a side plate, a threaded hole, a lead screw, a through hole, a guide rod, and a knob; The side plate is fixed to one side of the winding box, the threaded hole is opened in the middle of the side plate, the lead screw is located inside the threaded hole and is threadedly engaged with the inner wall of the threaded hole, the pressure rod is located at one end of the lead screw and is rotatably connected to the lead screw through a bearing, and the knob is fixed at the end of the lead screw away from the pressure rod. The perforations are provided in two sets and are opened on the upper and lower sides of the side plate. Each set of perforations has a set of guide rods slidably connected inside, and one end of the guide rods is fixedly connected to the pressure rod.

[0013] As a further aspect of the present invention: a display screen is mounted on the top of the positioning rod, a camera for taking pictures is mounted on one side of the mounting plate and above the winding box, an image processor is mounted on the side of the mounting plate away from the camera, the camera and the image processor are electrically connected, and the image processor and the display screen are electrically connected.

[0014] As a further aspect of the present invention: a foot pedal is fixed to the bottom end of the positioning rod, and multiple sets of ground anchors for fixing are fixed to the bottom end of the foot pedal.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention provides a device for semi-automatic and precise measurement of tree diameter at breast height (DBH) in the field. Utilizing a positioning rod with a constant height, it can measure the DBH value at the standard height of the tree, enabling standardized and precise measurement of DBH in the field. This avoids the inconsistency in DBH measurement results often caused by different operators during manual tree measurement, which affects the accuracy of the measurement data. Furthermore, the device is made of C-material, making it lightweight and easy to carry in the field. Its simple operation saves field work time, improves work efficiency, and meets usage requirements.

[0016] 2. The present invention provides a device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field. By setting a rotating component, the rotating component can drive one end of the measuring tape to rotate, so that the measuring tape can rotate around the tree once, which facilitates the measurement of the tree's DBH. At the same time, by using a clamping mechanism, the measuring tape can be tightly attached to the surface of the tree, reducing the situation where the measurement accuracy is low due to the unevenness of the tree surface, and further improving the accuracy of tree DBH detection.

[0017] 3. The present invention provides a device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field. By setting up a camera, the device can capture images of the measuring tape terminal and send them to an image processor. The image processor can automatically read the image information, process the image data, and then display the data on a screen, making it easier for users to read the DBH value of trees more intuitively and improving measurement efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0019] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0020] Figure 3 For the present invention Figure 2 A magnified structural diagram of part A in the middle.

[0021] Figure 4 For the present invention Figure 3 A magnified structural diagram of part B.

[0022] Figure 5 This is a schematic diagram of the internal structure of the winding box in this invention.

[0023] Figure 6 This is a schematic diagram of a partially disassembled structure in this invention.

[0024] Figure 7 For the present invention Figure 6 A magnified structural diagram of section C.

[0025] Figure 8 This is a partial structural diagram of the inflation mechanism of the present invention.

[0026] Figure 9 For the present invention Figure 8 A magnified structural diagram of part D in the middle.

[0027] Figure 10 This is a schematic diagram of the cross-sectional structure of the fixed cylinder in this invention.

[0028] Figure 11 This is a schematic diagram of the folded state of the two arc-shaped plates in this invention.

[0029] Figure 12 For the present invention Figure 11 A magnified structural diagram of section E in the middle.

[0030] The components include: 11. Positioning rod; 12. Foot pedal; 13. Display screen; 14. Mounting plate; 15. Arc-shaped plate; 16. Sliding groove; 17. Arc-shaped slider; 18. Gear ring; 19. Fixing block; 20. Slot; 21. Insert post; 22. Mounting groove; 23. First magnet block; 24. Second magnet block; 25. Gear; 26. Motor; 27. Motor base; 28. Air pump; 29. ​​Hose; 30. Delivery pipe; 31. Connecting pipe; 32. Mounting bracket; 33. Fixing cylinder; 34. Piston; 35. 36. Moving rod; 37. Spring; 38. Pressing block; 39. Winding box; 40. Winding roller; 41. Measuring tape; 42. Coil spring; 43. Strip groove; 44. Guide rod; 45. Side plate; 46. Threaded hole; 47. Lead screw; 48. Pressing rod; 49. Through hole; 50. Guide rod; 51. Knob; 52. Camera; 53. Image processor; 54. Ground anchor; 55. Indicator block; 56. Air outlet pipe; 57. Valve; 58. Fixed base; 59. Rotating base; 60. Screw; 51. Nut. Implementation

[0031] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0032] The present invention provides the following preferred embodiments: Example 1, as Figures 1-10As shown, a device for semi-automatic and precise measurement of tree diameter at breast height (DBH) in the field includes a positioning rod 11. Specifically, the positioning rod 11 is 1.3 meters long, which is the standard height for tree DBH. The positioning rod 11 is supported by C-material. By using the positioning rod 11 with a constant height, the DBH value at the standard height of the tree can be measured. This enables the precise measurement of standardized tree DBH in the field, avoiding the phenomenon that the DBH measurement results vary from person to person due to different operators during the manual measurement of each tree, which affects the accuracy of the measurement data. This reduces human error. At the same time, the main body of the device is made of C-material, which is lightweight and easy to carry in the field. It is simple to operate, saves field work time, and improves work efficiency. It also includes a mounting plate 14, a measuring mechanism, a guiding mechanism, and a clamping mechanism. Mounting plate 14 is fixed to one side of the top end of positioning rod 11, and mounting plate 14 provides an installation platform for measuring mechanism and guiding mechanism; The measuring mechanism is located on the side of the mounting plate 14 away from the positioning rod 11 and is used to measure the diameter at breast height (DBH) of trees. The measuring mechanism includes a measuring tape 40 and a winding assembly. The winding assembly is fixed to the surface of the mounting plate 14. The measuring tape 40 is wound inside the winding assembly. The winding assembly is used to wind up the measuring tape 40. When the measuring tape 40 is pulled out from the winding assembly, it rotates around the tree once. At the same time, the winding assembly can tighten the measuring tape 40 so that the measuring tape 40 can always maintain a certain tension and will not loosen. This facilitates the measurement of the DBH of trees and avoids the measuring tape 40 loosening from affecting the measurement results. The guiding mechanism is located on the side of the mounting plate 14 away from the positioning rod 11 and below the winding assembly. The guiding assembly includes an arc-shaped plate 15, a rotating assembly, and a guide rod 43. Two sets of arc-shaped plates 15 are provided and symmetrically arranged. One end of each set of arc-shaped plates 15 is hinged to the surface of the mounting plate 14, and the other ends of the two sets of arc-shaped plates 15 are connected by a snap-fit ​​assembly. The snap-fit ​​assembly allows the ends of the two sets of arc-shaped plates 15 away from the mounting plate 14 to be connected, ensuring that the two sets of arc-shaped plates 15 do not separate during tree measurement. This facilitates the rotation of the rotating assembly above the two sets of arc-shaped plates 15. By setting two sets of arc-shaped plates 15 hinged to the mounting plate 14, during tree measurement, the two sets of arc-shaped plates 15 open and fit over the tree, and then the two sets of arc-shaped plates... 15. Close the device, adjust and install its position to facilitate subsequent measurements. Note that the diameter of the circle formed by the two sets of arc plates 15 is much larger than the diameter of the tree to be measured, so that the arc plates 15 can be fitted onto the tree. The guide rod 43 is fixed above the rotating assembly. The rotating assembly is located above the two sets of arc plates 15 and is used to drive the guide rod 43 to rotate. The end of the measuring tape 40 extending out of the winding assembly is fitted onto the surface of the guide rod 43. The rotating assembly can drive the guide rod 43 to rotate, so that the guide rod 43 can rotate one full turn. Since the end of the measuring tape 40 is fitted onto the guide rod 43, the rotation of the guide rod 43 can drive the measuring tape 40 to rotate, so that the measuring tape 40 can circle the tree once, realizing the measurement of the tree's diameter at breast height. Specifically, it should be noted that in actual use, an indicator block 54 is fixed on the surface of the arc plate 15. In the initial state, the guide rod 43 corresponds to the position of the indicator block 54. At this time, the guide rod 43 is in the initial position. When the guide rod 43 rotates, it rotates to the indicator block 54, which makes it easy to mark the initial and ending positions of the guide rod 43, ensuring that the guide rod 43 can rotate a full circle, and thus ensuring that the measuring tape 40 can circle the tree a full circle, improving the detection accuracy.

[0033] The clamping mechanism includes a clamping block 37, a clamping rod 47, a first moving component, and a second moving component. The clamping block 37 is provided in several groups, and a first moving component is installed on one side of each group of clamping blocks 37. Each group of first moving components is installed on two groups of arc plates 15. The clamping rod 47 is provided in two groups, and a second moving component is installed on one side of each group of clamping rods 47. The two groups of second moving components are respectively installed on both sides of the winding component. Each first moving component can drive a set of pressing blocks 37 to move, so that the pressing blocks 37 can press against the measuring tape 40, so that the measuring tape 40 can be in close contact with the surface of the tree, reducing the situation of low measurement accuracy caused by uneven tree surface, and further improving the accuracy of tree diameter at breast height detection. The two sets of second moving components can drive the two sets of pressure rods 47 to move, so that the two sets of pressure rods 47 can abut against the beginning and end of the measuring tape 40, so that the beginning and end of the measuring tape 40 can also fit tightly against the surface of the forest, further improving the detection accuracy.

[0034] like Figures 1-10 As shown, the winding assembly includes a winding box 38, a winding roller 39, a coil spring 41, and a strip groove 42; The winding box 38 is fixed to the surface of the mounting plate 14. The winding roller 39 is located inside the winding box 38, and both ends of the winding roller 39 are rotatably connected to the winding box 38 through bearings. The strip groove 42 is opened on one side surface of the winding box 38. One end of the measuring tape 40 is wound around the surface of the winding roller 39, and the other end of the measuring tape 40 passes through the strip groove 42 and is sleeved on the guide rod 43. The coil spring 41 is provided in two sets. Both sets of coil spring 41 are sleeved on the surface of the winding roller 39. The two sets of coil spring 41 are symmetrically arranged on both sides of the measuring tape 40. The two ends of each set of coil spring 41 are respectively fixed to the winding roller 39 and the winding box 38. When the guide rod 43 rotates, the measuring tape 40 can be pulled out from inside the winding box 38. At this time, the measuring tape 40 drives the winding roller 39 to rotate, and the coil spring 41 deforms. The deformation energy of the coil spring 41 applies a reverse rotational force to the winding roller 39, so that when the measuring tape 40 is in a relatively loose state, the winding roller 39 can reverse, so that the excess measuring tape 40 can be rewound onto the winding roller 39, thereby ensuring that the measuring tape 40 is always in a taut state and improving measurement accuracy.

[0035] like Figures 1-10 As shown, the snap-fit ​​assembly includes a fixing block 19, a slot 20, and a pin 21; The fixing block 19 is provided in two sets. The two sets of fixing blocks 19 are respectively fixed to the bottom end of the two sets of arc plates 15 and the end away from the mounting plate 14. One set of fixing blocks 19 has a slot 20 on one side, and the other set of fixing blocks 19 has a plug 21 that cooperates with the slot 20 on one side. Specifically, the slot 20 and the plug 21 are interference fit. After the two sets of arc plates 15 are fitted onto the trees, rotating the two sets of arc plates 15 allows them to return to their original positions and form a complete circle. When the two sets of arc plates 15 are rotating, the insert 21 can be inserted into the slot 20, thus connecting the two sets of fixing blocks 19 and the two sets of arc plates 15. This prevents the two sets of arc plates 15 from separating during the measurement process and affecting the measurement accuracy.

[0036] like Figures 1-10 As shown, the rotating assembly includes a sliding groove 16, an arc-shaped slider 17, a toothed ring 18, and a gear 25; The sliding groove 16 is provided in two sets, and the two sets of sliding grooves 16 are respectively opened at the top of the two sets of arc plates 15. Each set of sliding grooves 16 has a set of arc sliders 17 sliding inside, and each set of arc sliders 17 has a set of toothed rings 18 fixed at the top. A connecting component is provided between the two sets of arc sliders 17 at their close ends to connect the two sets of arc sliders 17. Through the connecting component, after the two sets of arc plates 15 are closed, the two sets of arc sliders 17 can be connected end to end, so that the two sets of arc sliders 17 can form a complete circle. At this time, the two sets of toothed rings 18 can form a complete toothed ring. At the same time, after the two sets of arc plates 15 are closed, the two sets of sliding grooves 16 on the two sets of arc plates 15 can be connected end to end to form a circular groove. At this time, the complete circle formed by the two sets of arc sliders 17 can rotate inside the circular groove formed by the two sets of sliding grooves 16. The gear 25 is located on one side of the gear ring 18 and meshes with the gear ring 18. A motor 26 is provided below the gear 25. The output end of the motor 26 is fixedly connected to the central shaft of the gear 25. A motor base 27 is provided below the motor 26. One end of the motor base 27 is fixedly connected to the arc plate 15. The motor base 27 is provided to install the motor 26 and improve the stability of the motor 26 when it is working. When it is necessary to rotate the gear ring 18, the motor 26 is controlled to work. The motor 26 can drive the gear 25 to rotate. Since the gear 25 meshes with the gear ring 18, when the gear 25 rotates, it can drive the gear ring 18 to rotate. When the gear ring 18 rotates, it can drive the guide rod 43 located above the gear ring 18 to rotate, so that the guide rod 43 can rotate one revolution and drive the measuring tape 40 to rotate, so that the measuring tape 40 can circle the tree once.

[0037] like Figures 1-10 As shown, the connecting component includes four sets of mounting slots 22, two sets of second magnet blocks 24, and two sets of first magnet blocks 23; Four sets of mounting slots 22 are respectively opened at both ends of the two sets of arc-shaped sliders 17. The two sets of mounting slots 22 on one set of arc-shaped sliders 17 are each equipped with a first magnet block 23. The two sets of mounting slots 22 on the other set of arc-shaped sliders 17 are each equipped with a second magnet block 24 that attracts the first magnet block 23. By using the mutually attracted first magnet block 23 and second magnet block 24, when the two sets of arc-shaped plates 15 are closed, the two sets of arc-shaped sliders 17 can be connected end to end. At the same time, since the sliding groove 16 on the arc-shaped plate 15 can restrict the arc-shaped sliders 17, the two sets of arc-shaped sliders 17 are not easy to separate.

[0038] like Figures 1-10 As shown, each first moving assembly includes a mounting bracket 32, a fixed cylinder 33, a piston 34, a moving rod 35, and a spring 36; The mounting bracket 32 ​​is fixed to one side of the arc plate 15, the fixing cylinder 33 is fixed above the mounting bracket 32, the piston 34 slides inside the fixing cylinder 33, the outer diameter of the piston 34 matches the inner diameter of the fixing cylinder 33, the moving rod 35 is fixed to one side of the piston 34, the end of the moving rod 35 away from the piston 34 extends out of the fixing cylinder 33 and is fixedly connected to the pressing block 37, and the spring 36 is sleeved on the surface of the moving rod 35, and the two ends of the spring 36 are fixedly connected to the piston 34 and the fixing cylinder 33 respectively. The fixed cylinder 33 is provided with an air-filling mechanism at the end away from the pressure block 37 for pushing the piston 34 to move; Gas can be delivered to the inside of the fixed cylinder 33 through the inflation mechanism. At this time, the gas can drive the piston 34 to move inside the fixed cylinder 33. At this time, the spring 36 is in a compressed state. When the piston 34 moves, it can drive the moving rod 35 to move. The moving rod 35 can drive the pressing block 37 to move, so that the pressing block 37 can apply a pressure to the measuring tape 40, so that the measuring tape 40 can fit tightly against the surface of the tree. When it is necessary to release the pressure on the measuring tape 40, the gas inside the fixed cylinder 33 is released. At this time, under the action of the spring 36, the piston 34 can be reset, thereby allowing the pressure block 37 to be reset.

[0039] like Figures 1-10 As shown, the inflation mechanism includes an air pump 28, a hose 29, a delivery pipe 30, a connecting pipe 31, an air outlet pipe 55, and a valve 56; The air pump 28 is fixed to one side of the top of the positioning rod 11. The output end of the air pump 28 is connected to two sets of hoses 29. Since the hoses 29 are relatively soft, they will not affect the rotation of the arc plate 15. The other end of each set of hoses 29 is connected to a set of conveying pipes 30. Each set of conveying pipes 30 is connected to several sets of connecting pipes 31 on one side. The other end of each set of connecting pipes 31 is connected to the inner cavity of a set of fixed cylinders 33. When it is necessary to inflate the inside of the fixed cylinder 33, the air pump 28 is controlled to work so that the outside air can enter the inside of the delivery pipe 30 through the hose 29 and enter the inside of the fixed cylinder 33 through the connecting pipe 31 to complete the inflation of the fixed cylinder 33. Each set of delivery pipes 30 is connected to an air outlet pipe 55 at the end away from the hose 29, and each set of air outlet pipes 55 is equipped with a valve 56 for switching on and off. When venting is required, the valve 56 is opened to allow the gas to flow out through the vent pipe 55, thus venting the gas.

[0040] like Figures 1-10 As shown, each second moving assembly includes a side plate 44, a threaded hole 45, a lead screw 46, a through hole 48, a guide rod 49, and a knob 50; The side plate 44 is fixed to one side of the winding box 38. The threaded hole 45 is opened in the middle of the side plate 44. The lead screw 46 is located inside the threaded hole 45 and is threadedly engaged with the inner wall of the threaded hole 45. The pressure rod 47 is located at one end of the lead screw 46 and is rotatably connected to the lead screw 46 through a bearing. The knob 50 is fixed at the end of the lead screw 46 away from the pressure rod 47. The perforations 48 are provided in two sets and are opened on the upper and lower sides of the side plate 44. Each set of perforations 48 has a set of guide rods 49 slidably connected inside. One end of the guide rod 49 is fixedly connected to the pressing rod 47. Through the sliding connection between the perforation 48 and the guide rod 49, the pressing rod 47 can be guided when it moves, improving the stability of the pressing rod 47 when it moves and avoiding the situation where the pressing rod 47 rotates with the rotation of the lead screw 46. By rotating the knob 50, the knob 50 can drive the lead screw 46 to rotate. Since the lead screw 46 is threaded into the threaded hole 45, when the lead screw 46 rotates, it can be screwed into the inside of the threaded hole 45. At the same time, under the action of the through hole 48 and the guide rod 49, it can drive the pressure rod 47 to move, so that the pressure rod 47 can apply pressure to the measuring tape 40, so that the beginning and end of the measuring tape 40 can make better contact with the trees, reduce the gap between the beginning and end of the measuring tape 40 and the trees, and thus improve the detection accuracy.

[0041] like Figures 1-10 As shown, a display screen 13 is installed at the top of the positioning rod 11, a camera 51 for taking pictures is installed on one side of the mounting plate 14 and above the winding box 38, and an image processor 52 is installed on the side of the mounting plate 14 away from the camera 51. The camera 51 and the image processor 52 are electrically connected, the image processor 52 is electrically connected to the display screen 13, and the display screen 13 is electrically connected to the controller. By setting up camera 51, the terminal of measuring tape 40 can be photographed and sent to image processor 52. Image processor 52 can automatically read image information, process image data, and then display the data on display screen 13, making it easier for users to read the diameter at breast height (DBH) of trees more intuitively and improving measurement efficiency.

[0042] like Figures 1-10 As shown, a foot pedal 12 is fixed to the bottom end of the positioning rod 11, and multiple sets of ground anchors 53 are fixed to the bottom end of the foot pedal 12 for fixing. When the two sets of arc plates 15 are sleeved on the outside of the trees, one side of the trees is tightly attached to the hinge end of the arc plate 15. Then, multiple sets of ground anchors 53 are inserted into the soil to fix the device.

[0043] The specific working process of this invention is as follows: First, rotate the two sets of arc plates 15 so that they open and fit onto the trees. Then, reverse the two sets of arc plates 15 so that they close. When the two sets of arc plates 15 rotate, the insert 21 can be inserted into the slot 20 to connect the two sets of fixing blocks 19, and thus connect the two sets of arc plates 15, so that the two sets of arc plates 15 can form a complete circle. Move the position of the device so that one side of the tree is tightly attached to the hinge end of the arc plate 15. Then, insert multiple sets of ground anchors 53 into the soil to fix the device. After the two sets of arc-shaped plates 15 are closed, the two sets of sliding grooves 16 on the two sets of arc-shaped plates 15 can be connected end to end to form a circular groove. Using the mutually attracting first magnet 23 and second magnet 24, the two sets of arc-shaped sliders 17 can be connected end to end, allowing the two sets of arc-shaped sliders 17 to form a complete circle. At this time, the two sets of toothed rings 18 can form a complete toothed ring. Simultaneously, the complete circle formed by the two sets of arc-shaped sliders 17 can rotate inside the circular groove formed by the two sets of sliding grooves 16. Then, the motor 26 is controlled to work, and the motor 26 can drive the gear 25 to rotate. Since the gear 25 meshes with the toothed ring 18, when the gear 25 rotates... When in motion, it can drive the toothed ring 18 to rotate. When the toothed ring 18 rotates, it can drive the guide rod 43 located above the toothed ring 18 to rotate, so that the guide rod 43 can rotate one revolution and drive the measuring tape 40 to rotate, so that the measuring tape 40 can circle the tree once. In the initial state, the guide rod 43 corresponds to the position of the indicator block 54. At this time, the guide rod 43 is located in the initial position. When the guide rod 43 rotates, it still rotates to the indicator block 54, which makes it easy to mark the initial position and the end position of the guide rod 43, ensuring that the guide rod 43 can rotate one revolution, and thus ensuring that the measuring tape 40 can circle the tree once. During this process, when the guide rod 43 rotates, the measuring tape 40 can be pulled out from inside the winding box 38. At this time, the measuring tape 40 drives the winding roller 39 to rotate, and the coil spring 41 deforms. The deformation energy of the coil spring 41 applies a reverse rotational force to the winding roller 39, so that when the measuring tape 40 is in a relatively loose state, the winding roller 39 can reverse, so that the excess measuring tape 40 can be rewound onto the winding roller 39, thereby ensuring that the measuring tape 40 is always in a taut state and improving the measurement accuracy. When the guide rod 43 rotates to its initial position, the control air pump 28 operates, allowing external gas to enter the delivery pipe 30 through the hose 29 and then through the connecting pipe 31 into the fixed cylinder 33. The gas drives the piston 34 to move within the fixed cylinder 33. At this time, the spring 36 is compressed. The piston 34's movement drives the moving rod 35, which in turn moves the pressure block 37. This pressure block applies pressure to the measuring tape 40, ensuring it fits snugly against the surface of the trees, reducing pressure caused by uneven tree surfaces. In cases where measurement accuracy is not high, this method further improves the accuracy of tree diameter at breast height (DBH) detection. Simultaneously, rotating knob 50 drives screw 46 to rotate. Since screw 46 is threaded into threaded hole 45, it can be screwed into the hole when rotated. At the same time, under the action of through hole 48 and guide rod 49, it drives pressure rod 47 to move, allowing pressure rod 47 to apply pressure to measuring tape 40. This ensures better contact between the beginning and end of measuring tape 40 and the trees, reducing gaps between the beginning and end of measuring tape 40 and the trees, thereby improving detection accuracy. At this time, the camera 51 is controlled to work. The camera 51 can take pictures of the terminal of the measuring tape 40 and send them to the image processor 52. The image processor 52 can automatically read the image information, process the image data, and then send the data to the display screen 13 for display, so that users can read the diameter at breast height of the trees more intuitively.

[0044] Example 2, as Figures 11-12 As shown, a hinge mechanism is provided at the middle part of the positioning rod 11 near the top. The hinge mechanism includes a fixed seat 57, a rotating seat 58, two screws 59 and two screws 60. The fixed seat 57 and the rotating seat 58 are respectively fixed to the two positioning rods 11 at their close ends. The rotating seat 58 is inserted into the middle of the fixed seat 57. Two screws 59 are respectively fixed to the two sides of the rotating seat 58. Each screw 59 passes through a fixed seat 57. Each screw 59 is provided with a nut 60 that mates with the screw 59. The nut 60 is located on the outside of the fixed seat 57. Specifically, a washer is provided on the side of the nut 60 closest to the fixed seat 57. The positioning rod 11 is foldable by means of the fixed seat 57, rotating seat 58, screw 59 and nut 60, which in turn makes it easy to fold the device, thus reducing the space occupied by the device and making it easier for personnel to carry.

[0045] The beneficial effects of the present invention are specifically reflected in the fact that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for semi-automatic and precise determination of tree diameter at breast height (DBH) in the field, comprising a positioning rod (11), characterized in that, It also includes a mounting plate (14), a measuring mechanism, a guiding mechanism, and a clamping mechanism; The mounting plate (14) is fixed to one side of the top of the positioning rod (11); The measuring mechanism is located on the side of the mounting plate (14) away from the positioning bar (11) for measuring the diameter at breast height of trees. The measuring mechanism includes a measuring tape (40) and a winding assembly. The winding assembly is fixed to the surface of the mounting plate (14), and the measuring tape (40) is wound inside the winding assembly. The guiding mechanism is located on the side of the mounting plate (14) away from the positioning bar (11) and below the winding assembly. The guiding assembly includes an arc plate (15), a rotating assembly, and a guide rod (43). There are two sets of arc plates (15) arranged symmetrically. One end of each set of arc plates (15) is hinged to the surface of the mounting plate (14). The other ends of the two sets of arc plates (15) are connected by a snap-fit ​​assembly. The guide rod (43) is fixed above the rotating assembly. The rotating assembly is located above the two sets of arc plates (15) and is used to drive the guide rod (43) to rotate. The measuring tape (40) extends out of the winding assembly and is sleeved on the surface of the guide rod (43). The clamping mechanism includes a clamping block (37), a clamping rod (47), a first moving component, and a second moving component. The clamping block (37) is provided in several groups. Each group of clamping blocks (37) has a first moving component installed on one side. Each group of first moving components is installed on two sets of arc plates (15). The clamping rod (47) is provided in two groups. Each group of clamping rods (47) has a second moving component installed on one side. The two sets of second moving components are respectively installed on both sides of the winding component.

2. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 1, characterized in that, The winding assembly includes a winding box (38), a winding roller (39), a coil spring (41), and a strip groove (42); The winding box (38) is fixed to the surface of the mounting plate (14), the winding roller (39) is located inside the winding box (38), and both ends of the winding roller (39) are rotatably connected to the winding box (38) through bearings. The strip groove (42) is opened on one side surface of the winding box (38). One end of the measuring tape (40) is wrapped around the surface of the winding roller (39), and the other end of the measuring tape (40) passes through the strip groove (42) and is sleeved on the guide rod (43). The coil spring (41) is provided in two sets. Both sets of coil springs (41) are sleeved on the surface of the winding roller (39). The two sets of coil springs (41) are symmetrically arranged on both sides of the measuring tape (40). The two ends of each set of coil springs (41) are respectively fixed on the winding roller (39) and the winding box (38).

3. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 2, characterized in that, The snap-fit ​​assembly includes a retaining block (19), a slot (20), and a pin (21); The fixing block (19) is provided in two sets. The two sets of fixing blocks (19) are respectively fixed to the bottom end of the two sets of arc plates (15) and the end away from the mounting plate (14). One set of fixing blocks (19) has a slot (20) on one side, and the other set of fixing blocks (19) has a plug (21) that cooperates with the slot (20) on one side.

4. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 3, characterized in that, The rotating assembly includes a sliding groove (16), an arc-shaped slider (17), a gear ring (18), and a gear (25); The sliding groove (16) is provided in two sets. The two sets of sliding grooves (16) are respectively opened at the top of the two sets of arc plates (15). Each set of sliding grooves (16) has a set of arc sliders (17) sliding inside. Each set of arc sliders (17) has a set of toothed rings (18) fixed at the top. A connecting component for connecting the two sets of arc sliders (17) is provided between the ends of the two sets of arc sliders (17) that are close to each other. The gear (25) is located on one side of the gear ring (18) and meshes with the gear ring (18). A motor (26) is provided below the gear (25). The output end of the motor (26) is fixedly connected to the central shaft of the gear (25). A motor base (27) is provided below the motor (26). One end of the motor base (27) is fixedly connected to the arc plate (15).

5. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 4, characterized in that, The connecting component includes four sets of mounting slots (22), two sets of second magnet blocks (24), and two sets of first magnet blocks (23); Four sets of mounting slots (22) are respectively opened at both ends of two sets of arc-shaped sliders (17). The first magnet block (23) is installed inside the two sets of mounting slots (22) on one set of arc-shaped sliders (17), and the second magnet block (24) that attracts the first magnet block (23) is installed inside the two sets of mounting slots (22) on the other set of arc-shaped sliders (17).

6. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 5, characterized in that, Each first moving component includes a mounting bracket (32), a fixed cylinder (33), a piston (34), a moving rod (35), and a spring (36); The mounting bracket (32) is fixed to one side of the arc plate (15), the fixing cylinder (33) is fixed above the mounting bracket (32), the piston (34) slides inside the fixing cylinder (33), the outer diameter of the piston (34) matches the inner diameter of the fixing cylinder (33), the moving rod (35) is fixed to one side of the piston (34), the end of the moving rod (35) away from the piston (34) extends out of the fixing cylinder (33) and is fixedly connected to the pressing block (37), the spring (36) is sleeved on the surface of the moving rod (35), and the two ends of the spring (36) are fixedly connected to the piston (34) and the fixing cylinder (33) respectively; The fixed cylinder (33) is provided with an inflation mechanism at the end away from the pressure block (37) for pushing the piston (34) to move.

7. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 6, characterized in that, The inflation mechanism includes an air pump (28), a hose (29), a delivery pipe (30), a connecting pipe (31), an air outlet pipe (55), and a valve (56); The air pump (28) is fixed to one side of the top of the positioning rod (11). The output end of the air pump (28) is connected to two sets of hoses (29). The other end of each set of hoses (29) is connected to a set of delivery pipes (30). Each set of delivery pipes (30) is connected to several sets of connecting pipes (31) on one side. The other end of each set of connecting pipes (31) is connected to the inner cavity of a set of fixed cylinders (33). Each set of delivery pipes (30) is connected to an air outlet pipe (55) at the end away from the hose (29), and each set of air outlet pipes (55) is equipped with a valve (56) for switching on and off.

8. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 7, characterized in that, Each second moving component includes a side plate (44), a threaded hole (45), a lead screw (46), a through hole (48), a guide rod (49), and a knob (50). The side plate (44) is fixed to one side of the winding box (38), the threaded hole (45) is opened in the middle of the side plate (44), the lead screw (46) is located inside the threaded hole (45) and is threadedly engaged with the inner wall of the threaded hole (45), the pressure rod (47) is located at one end of the lead screw (46) and is rotatably connected to the lead screw (46) through a bearing, and the knob (50) is fixed at the end of the lead screw (46) away from the pressure rod (47); The perforations (48) are provided in two sets and are opened on the upper and lower sides of the side plate (44). Each set of perforations (48) is slidably connected to a set of guide rods (49), and one end of the guide rods (49) is fixedly connected to the pressing rods (47).

9. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 8, characterized in that, A display screen (13) is installed at the top of the positioning rod (11). A camera (51) for taking pictures is installed on one side of the mounting plate (14) and above the winding box (38). An image processor (52) is installed on the side of the mounting plate (14) away from the camera (51). The camera (51) and the image processor (52) are electrically connected. The image processor (52) and the display screen (13) are electrically connected.

10. The device for semi-automatic and accurate determination of tree diameter at breast height (DBH) in the field according to claim 9, characterized in that, The bottom end of the positioning rod (11) is fixed with a foot pedal (12), and the bottom end of the foot pedal (12) is fixed with multiple sets of ground anchors (53) for fixing.

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