Portable forest sample plot rapid laying and tree diameter at breast height measuring device

Abstract

The invention discloses a portable forest sample plot rapid layout and tree diameter at breast height measuring device, relates to the related technical field of tree diameter at breast height measuring, is suitable for layout of sample plots of various terrains, is simple to operate and convenient to carry in the prior art, and aims to solve the problems that the layout of the sample plots in the forest land is complex in topographic condition, many in shrub obstruction and incapable of ensuring that four corners of layout are 90 degrees. If the error exceeds the error range, correction needs to be carried out, the time spent on correction is possibly similar to or even longer than the time spent on arrangement, the angle of the fixator of the device in the horizontal direction can be constant, correction is not needed, more time can be saved, meanwhile, when the field area is insufficient or other problems exist in the sample plot arrangement process, the device can only be removed for re-arrangement, and the operation is convenient. The device judges whether the position is proper or not according to the laser intersection point, so that the condition of unreasonable layout in the layout process is avoided, and the working efficiency is improved; and the operation is simple, one person can operate the device, and the device can pass once without walking repeatedly, so that the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field related to tree diameter at breast height measurement, and in particular to a portable forest sample plot rapid deployment and tree diameter at breast height measurement device. Background Art

[0002] As an important terrestrial ecosystem, forests play an extremely important role in maintaining biodiversity, regulating global climate, and increasing carbon storage. The foundation of forestry development is forest resources. The status of forest resources is also an important criterion for measuring the level of forestry development. How to quickly, accurately and efficiently obtain forest resource information and realize scientific management and sustainable use of forest resources is the focus of forestry workers.

[0003] In forest resource inventory, usually in accordance with relevant requirements and field conditions, by establishing a monitoring plot for local measurement, the characteristics and laws of the entire forest stand are inferred. Therefore, the layout of sample plots is the most important thing in all kinds of forestry surveys and is the basic work of forest resource surveys. The precise layout of sample plots can reduce experimental errors and improve monitoring accuracy. Forest resource surveys have strict control over the size, shape, and number of sample plots. In the past, the measurement method of laying out sample plots using forest compasses and measuring ropes was relatively cumbersome, expensive, time-consuming and laborious to operate, and usually required the cooperation of multiple people. It takes a lot of time to lay out sample plots, which affects the overall progress of the survey.

[0004] In forestry surveys, the diameter at breast height of trees is an important indicator parameter. It is an important basis for establishing forest monitoring plots and evaluating the basic conditions of forests. At present, my country's forest resource inventory measures the diameter at breast height of trees mainly using contact tools such as breast diameter rulers, tape measures, calipers and wheel calipers. When using a tape measure for measurement, it usually requires the cooperation of two workers, one for measurement and the other for recording the measurement data. This traditional operation method has the problems of low measurement speed and insufficient measurement accuracy. Summary of the invention

[0005] The purpose of the present invention is to provide a portable forest sample plot rapid layout and tree diameter measurement device to solve the problems of low measurement speed and insufficient measurement accuracy in the traditional operation method proposed in the above background.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a portable forest sample plot rapid layout and tree diameter measurement device, comprising a support frame, one side of the support frame is rotatably connected to a first positioning wheel, the other side of the support frame is rotatably connected to a second positioning wheel, the middle part of the support frame is fixedly connected to a gear lever, the gear lever is provided with a first gear hole, a second gear hole and a third gear hole in sequence according to a predetermined distance, an angle measuring rod is inserted into one of the gear holes, the angle measuring rod comprises a telescopic sleeve, the upper end of the telescopic sleeve is rotatably connected to a first rotating arm and a second rotating arm, a measuring sensor is arranged at the intersection of the first rotating arm and the second rotating arm, and a positioning nut is fixedly connected to the connection between the telescopic sleeve and the first rotating arm and the second rotating arm by the same thread; The circuit structure of the device includes a main control module, a data acquisition module, a data storage module, an interaction module, a WIFI module and a power module; The main control module is mainly used for controlling the device and processing data. It has the advantage of having multiple IO ports for programming. In addition, it is also equipped with an operating system to support the development of upper-level applications and can complete more complex tasks. The data acquisition module is based on a measuring sensor, which is provided with three groups, namely a first angle sensor for measuring the rotation angle of the first rotating arm, a second angle sensor for measuring the rotation angle of the second rotating arm, and an inclination sensor for measuring the inclination degree of the trunk, and the data acquisition module also includes a digital analog conversion chip PCF8591; The data storage module is mainly used to save the data obtained during the measurement process. During the measurement of the tree diameter at breast height, the module can receive and store the diameter at breast height measurement value from the data acquisition module. In this way, the user does not need to record the data immediately after each measurement, but can view and export the previously stored data through the interactive module after the measurement is completed. The existence of the data storage module greatly improves the convenience of measurement and the traceability of data; The interactive module is mainly used to display various information of the measurement process to the user in real time and receive operation instructions provided by the user; The WIFI module is built into the main control module and is used to realize wireless transmission of data. After the measurement is completed, the user can wirelessly transmit the data stored in the data storage module to a mobile device, a computer or other remote server through the WIFI module, so that the user can access and analyze the measurement data anytime and anywhere without transmitting data through a wired connection or a physical storage device. The existence of the WIFI module not only improves the data transmission efficiency, but also makes data sharing and analysis more flexible and convenient; The power module is composed of a 18650 lithium battery, a battery assembly, a charger and a switch, and has functions such as charging, discharging and short-circuit protection. It supplies power to the main control module and supplies power to other external devices through the main control module.

[0007] Furthermore, the first positioning wheel is provided with two, namely, a first upper positioning wheel and a first lower positioning wheel, the first upper positioning wheel is rotatably connected to the upper part of the support frame, the first lower positioning wheel is rotatably connected to the lower part of the support frame, the first upper positioning wheel and the first lower positioning wheel rotation axis coincide, the gap between the first upper positioning wheel and the first lower positioning wheel is greater than the thickness of the first rotating arm, and the second positioning wheel is provided with two, namely, a second upper positioning wheel and a second lower positioning wheel, the second upper positioning wheel is rotatably connected to the upper part of the support frame, and the second lower positioning wheel is rotatably connected to the lower part of the support frame, the rotation axis of the second upper positioning wheel and the second lower positioning wheel coincide, and the gap between the second upper positioning wheel and the second lower positioning wheel is greater than the thickness of the second rotating arm, so that the first rotating arm can pass through the gap between the first upper positioning wheel and the first lower positioning wheel when rotating, and the second rotating arm can pass through the gap between the second upper positioning wheel and the second lower positioning wheel when rotating.

[0008] Furthermore, a tension spring is provided at one end of the first rotating arm and the second rotating arm, and both ends of the tension spring are fixedly connected to the first rotating arm and the second rotating arm respectively, so that the tension spring can tighten the first rotating arm and the second rotating arm, so that the other ends of the first rotating arm and the second rotating arm clamp the tree, thereby increasing the measurement accuracy.

[0009] Furthermore, a telescopic rod passes through the telescopic sleeve. When the telescopic rod is stretched to its longest length, the total length of the telescopic sleeve and the telescopic rod is 1.3 m. Because the diameter at breast height of a tree is generally measured at a height of 1.3 m from the ground, the diameter of the tree trunk at 1.3 m from the ground can intuitively reflect the thickness of the tree and is an important indicator in measuring tree specifications.

[0010] In one example, a first vertical pole is fixedly connected to one side of the support frame, and a second vertical pole is fixedly connected to the other side of the support frame. A winding wheel is rotatably connected to the first vertical pole, a hand wheel is fixedly connected to the upper end of the winding wheel, a fixed chain is wound on the winding wheel, and a hook is fixedly connected to one end of the fixed chain, and the hook is hung on the second vertical pole.

[0011] Furthermore, the fixed chain includes a metal chain, the metal chain is provided in two groups, and a rolling column is rotatably connected between the two groups of metal chains.

[0012] In one example, the angle measuring rod is used in conjunction with a plot marking rod for rapid deployment of forest plots, and a group of laser indicators are fixedly mounted on the first rotating arm and the second rotating arm of the angle measuring rod, respectively, and the direction indicated by the laser indicators is consistent with the direction of the first rotating arm and the second rotating arm.

[0013] Furthermore, the laser pointer is fixedly mounted on the first rotating arm and the second rotating arm through a fixing sleeve, and the laser pointer is fixedly mounted on the fixing sleeve through bolts. The fixing sleeve is arranged on the first rotating arm and the second rotating arm, and a positioning bolt is threadedly connected to one side of the fixing sleeve, and the positioning bolt passes through the fixing sleeve, and the positioning bolt is against the side surfaces of the first rotating arm and the second rotating arm.

[0014] In one example, the first gear hole is located at the midpoint of the line connecting the bottom ends of the rotating shafts of the first positioning wheel and the second positioning wheel, the distance between the second gear hole and the first gear hole is 30 mm, the distance between the third gear hole and the first gear hole is 60 mm, the diameters of the first positioning wheel and the second positioning wheel are both 120 mm, the center distance between the first positioning wheel and the second positioning wheel is 180 mm, and the widths of the first rotating arm and the second rotating arm are both 8 mm.

[0015] Furthermore, the calculation formula for the tree's diameter at breast height is: ; Wherein, R is the radius of the tree to be measured; θ is half of the sum of the angles measured by the first angle sensor and the second angle sensor (1402); W is the width of the first rotating arm and the second rotating arm; H is the distance between the gear hole inserted into the angle measuring rod and the first gear hole; d is the diameter of the first positioning wheel and the second positioning wheel; S is the center distance between the first positioning wheel and the second positioning wheel.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Improve the efficiency of sample plot layout: It is suitable for sample plot layout in various terrains, simple to operate, and easy to carry. In the existing technology, sample plots are laid out in forests, the terrain conditions are complex, and there are many obstacles in the bushes. It is impossible to ensure that the four corners of the layout are 90°. If the error range is exceeded, correction is required, and the time spent on correction may be similar to or even longer than the time spent on layout. The angle of the fixture in the horizontal direction of this device can be constant, and no correction is required, which can save more time. At the same time, when there is insufficient site area or other problems during the sample plot layout, the device can only be removed and re-laid. The device determines whether the position is appropriate based on the laser intersection, avoiding unreasonable layout during the layout process, thereby improving work efficiency; it is simple to operate, can be operated by one person, and can be done once without repeating the route, greatly improving work efficiency.

[0017] 2. Improve the accuracy of tree breast diameter measurement: Traditional tree breast diameter measurement mainly uses breast diameter ruler, tape measure, caliper and wheel caliper and other tools. First, there will be obvious measurement errors during measurement, and second, it requires the cooperation of two people.

[0018] 3. Integration of sample plot layout and tree measurement device: This device integrates rapid sample plot layout with precise measurement of tree diameter at breast height, which not only improves the efficiency of forest resource survey, but also greatly reduces the burden of tools carried by staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a portable forest plot rapid deployment and tree diameter measurement device according to the present invention; Figure 2 This is a schematic diagram of the appearance structure of the present invention; Figure 3 It is a schematic diagram of the gear lever structure of the present invention; Figure 4 This is a schematic diagram of the angle measuring rod structure of the present invention; Figure 5 For the present invention Figure 1 The enlarged structural diagram at A in the middle; Figure 6 This is a schematic diagram of the sample layout method of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle; Figure 8 It is a schematic diagram of the circuit structure of the present invention; Fig. 9 It is a schematic diagram of the measurement principle of the present invention; Fig.10 It is a flow chart of the program of the present invention.

[0020] Numbers in the figure: 1, support frame; 2, first positioning wheel; 201, first upper positioning wheel; 202, first lower positioning wheel; 3, second positioning wheel; 301, second upper positioning wheel; 302, second lower positioning wheel; 4, gear lever; 5, first gear hole; 6, second gear hole; 7, third gear hole; 8, angle measuring rod; 9, telescopic sleeve; 10, telescopic rod; 11, first rotating arm; 12, second rotating arm; 13, tension spring; 14, measuring sensor; 1401, first angle sensor; 1402, second angle sensor; 1403, inclination sensor; 15, positioning nut; 16, first vertical pole; 17, second vertical pole; 18, winding wheel; 19, hand wheel; 20, fixed chain; 2001, metal chain; 2002, rolling column; 21, hook; 22, sample site marking rod; 23, laser indicator; 24, fixing sleeve; 25, positioning bolt. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1-7 As shown, a portable forest plot rapid layout and tree diameter measurement device comprises a support frame 1, one side of the support frame 1 is rotatably connected to a first positioning wheel 2, the other side of the support frame 1 is rotatably connected to a second positioning wheel 3, a middle part of the support frame 1 is fixedly connected to a gear lever 4, a first gear hole 5, a second gear hole 6 and a third gear hole 7 are sequentially opened on the gear lever 4 according to a predetermined distance, an angle measuring rod 8 is inserted into one of the gear holes, and the angle measuring rod 8 comprises a telescopic sleeve 9, the upper end of the telescopic sleeve 9 is rotatably connected to a first rotating arm 11 and a second rotating arm 12, A tension spring 13 is provided at one end of the first rotating arm 11 and the second rotating arm 12, and both ends of the tension spring 13 are fixedly connected to the first rotating arm 11 and the second rotating arm 12 respectively, so that the tension spring 13 can tighten the first rotating arm 11 and the second rotating arm 12, so that the other ends of the first rotating arm 11 and the second rotating arm 12 clamp the tree to increase the measurement accuracy. A measuring sensor 14 is provided at the intersection of the first rotating arm 11 and the second rotating arm 12, and a positioning nut 15 is fixedly connected to the connection between the telescopic sleeve 9 and the first rotating arm 11 and the second rotating arm 12 by the same thread.

[0023] Specifically, two first positioning wheels 2 are provided, namely a first upper positioning wheel 201 and a first lower positioning wheel 202. The first upper positioning wheel 201 is rotatably connected to the upper portion of the support frame 1, and the first lower positioning wheel 202 is rotatably connected to the lower portion of the support frame 1. The rotation axis of the first upper positioning wheel 201 and the first lower positioning wheel 202 coincide. The gap between the first upper positioning wheel 201 and the first lower positioning wheel 202 is greater than the thickness of the first rotating arm 11. Two second positioning wheels 3 are provided, namely a second upper positioning wheel 301 and a second lower positioning wheel 302. The second upper positioning wheel 301 is rotatably connected to the upper portion of the support frame 1, and the second lower positioning wheel 302 is rotatably connected to the lower portion of the support frame 1. The rotation axis of the second upper positioning wheel 301 and the second lower positioning wheel 302 coincide. The gap between the second upper positioning wheel 301 and the second lower positioning wheel 302 is greater than the thickness of the second rotating arm 12. In this way, the first rotating arm 11 can pass through the gap between the first upper positioning wheel 201 and the first lower positioning wheel 202 when rotating, and the second rotating arm 12 can pass through the gap between the second upper positioning wheel 301 and the second lower positioning wheel 302 when rotating.

[0024] Specifically, a telescopic rod 10 runs through the telescopic sleeve 9. When the telescopic rod 10 is stretched to its longest length, the total length of the telescopic sleeve 9 and the telescopic rod 10 is 1.3 meters. Because the diameter of a tree at breast height is generally measured at a height of 1.3 meters from the ground, the diameter of the trunk of a tree at a height of 1.3 meters from the ground can directly reflect the thickness of the tree and is an important indicator in measuring tree specifications. Therefore, the total length of the telescopic sleeve 9 and the telescopic rod 10 is 1.3 meters, which can clearly indicate the precise measurement height.

[0025] like Figure 8 As shown, the circuit structure of a portable forest plot rapid layout and tree diameter measurement device includes a main control module, a data acquisition module, a data storage module, an interaction module, a WIFI module and a power module; The main control module is mainly used for controlling devices and processing data. It has the advantage of having multiple IO ports for programming. In addition, it is equipped with an operating system to support the development of upper-level applications and can complete more complex tasks. The data acquisition module is based on the measuring sensor 14. The measuring sensor 14 is provided with three groups, namely, a first angle sensor 1401 for measuring the rotation angle of the first rotating arm 11, a second angle sensor 1402 for measuring the rotation angle of the second rotating arm 12, and an inclination sensor 1403 for measuring the inclination degree of the trunk. The data acquisition module also includes a digital analog conversion chip PCF8591; The data storage module is mainly used to save the data obtained during the measurement process. During the measurement of the tree diameter at breast height, this module can receive and store the diameter at breast height measurement value from the data acquisition module. In this way, the user does not need to record the data immediately after each measurement, but can view and export the previously stored data through the interactive module after the measurement is completed. The existence of the data storage module greatly improves the convenience of measurement and the traceability of data; The interactive module is mainly used to display various information of the measurement process to the user in real time and receive operation instructions provided by the user; The WIFI module is built into the main control module and is used to realize wireless data transmission. After the measurement is completed, the user can wirelessly transmit the data stored in the data storage module to a mobile device, computer or other remote server through the WIFI module, so that the user can access and analyze the measurement data anytime and anywhere without transmitting data through a wired connection or physical storage device. The existence of the WIFI module not only improves the data transmission efficiency, but also makes data sharing and analysis more flexible and convenient; The power module consists of an 18650 lithium battery, a battery pack, a charger and a switch. It has functions such as charging, discharging and short-circuit protection. It supplies power to the main control module and also supplies power to other external devices through the main control module.

[0026] In one embodiment, a first vertical pole 16 is fixedly connected to one side of the support frame 1, and a second vertical pole 17 is fixedly connected to the other side of the support frame 1. A winding wheel 18 is rotatably connected to the first vertical pole 16, and a hand wheel 19 is fixedly connected to the upper end of the winding wheel 18. A fixed chain 20 is wound on the winding wheel 18, and a hook 21 is fixedly connected to one end of the fixed chain 20, and the hook 21 is hung on the second vertical pole 17. The fixed chain 20 includes a metal chain 2001. The metal chain 2001 is provided with two groups, and a rolling column 2002 is rotatably connected between the two groups of metal chains 2001, so that during measurement, the fixed chain 20 can be passed around the tree to be measured and hung on the second vertical pole 17 on the other side, and then the hand wheel 19 is rotated to drive the winding wheel 18 to tighten the fixed chain 20, so that the device can be fixed. Since the rolling column 2002 can only rotate horizontally, the device cannot move up and down after being fixed, but can rotate horizontally around the tree, so that the diameter of the tree in different directions can be measured, reducing the measurement error caused by the tree trunk not being round.

[0027] In another embodiment, the angle measuring rod 8 is used in conjunction with the plot marking rod 22 when used to quickly lay out the forest plot. A group of laser indicators 23 are fixedly installed on the first rotating arm 11 and the second rotating arm 12 on the angle measuring rod 8, respectively. The indication direction of the laser indicator 23 is consistent with the direction of the first rotating arm 11 and the second rotating arm 12. The laser indicator 23 is fixedly installed on the first rotating arm 11 and the second rotating arm 12 through a fixing sleeve 24. The laser indicator 23 is fixedly installed on the fixing sleeve 24 through bolts. The fixing sleeve 24 is sleeved on the first rotating arm 11 and the second rotating arm 12. A positioning bolt 25 is threadedly connected to one side of the sleeve 24. The positioning bolt 25 passes through the fixed sleeve 24, and the positioning bolt 25 abuts against the sides of the first rotating arm 11 and the second rotating arm 12, so that the angle measuring rod 8 can be inserted into a corner of the forest sample plot during measurement, and then the angle between the first rotating arm 11 and the second rotating arm 12 is adjusted to 90°, and the laser indicator 23 is installed on the first rotating arm 11 and the second rotating arm 12, and the laser intersection of the laser indicator 23 is used to indicate the insertion of the sample plot marking rod 22, thereby avoiding unreasonable layout during the layout process, thereby improving work efficiency.

[0028] In another embodiment, the first gear hole 5 is located at the midpoint of the line connecting the bottom ends of the rotating shafts of the first positioning wheel 2 and the second positioning wheel 3, the distance between the second gear hole 6 and the first gear hole 5 is 30 mm, the distance between the third gear hole 7 and the first gear hole 5 is 60 mm, the diameters of the first positioning wheel 2 and the second positioning wheel 3 are both 120 mm, the center distance between the first positioning wheel 2 and the second positioning wheel 3 is 180 mm, and the widths of the first rotating arm 11 and the second rotating arm 12 are both 8 mm.

[0029] Therefore, the tree's diameter at breast height can be calculated based on the existing data. Fig. 9As shown, C1 and C2 are the rotation centers of the first positioning wheel 2 and the second positioning wheel 3 respectively; the diameters of the first positioning wheel 2 and the second positioning wheel 3 are both d=120 mm; the center distance between the first positioning wheel 2 and the second positioning wheel 3 is S=180 mm; C3 is the rotation center of the first positioning wheel 2 and the second positioning wheel 3, and C3 can move forward and backward, and can be at the first gear hole 5, the second gear hole 6 or the third gear hole 7, but its position is always perpendicular to the straight line connected by C1C2, and the distance from C3 to the straight line C1C2 is H, and H is set for three gear distances, which are 0, 30 mm, and 60 mm respectively. The swing angle of the measuring rod is measured by two angle sensors. The swing angle of the first rotating arm 11 relative to the symmetry line C3C4 is θ, which is half of the sum of the angles measured by the first angle sensor 1401 and the second angle sensor 1402. The swing angle of the second rotating arm 12 relative to the symmetry line C3C4 is θ', which is equal to θ. The widths of the first rotating arm 11 and the second rotating arm 12 are both 8 mm. The center of the tree to be measured is C4, and the radius of the tree to be measured is R. A is the center point where the tree is tangent to the first rotating arm 11; and B is the intersection of the line connecting C3C4 and C1C2.

[0030] In the right triangle C3AC4, we have: ; Where F(R) is the distance from C4 to C1C2: ; From this we get: ; The following equation is obtained: ; By filling the data measured by the angle sensor and related parameters into the above equation, the radius of the tree to be measured can be solved.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable forest sample plot rapid layout and tree diameter measurement device, comprising a support frame (1), characterized in that: A first positioning wheel (2) is rotatably connected to one side of the support frame (1), and a second positioning wheel (3) is rotatably connected to the other side of the support frame (1). A gear lever (4) is fixedly connected to the middle of the support frame (1). A first gear hole (5), a second gear hole (6) and a third gear hole (7) are sequentially provided on the gear lever (4) at a predetermined distance, and an angle measuring rod (8) is inserted into one of the gear holes. The angle measuring rod (8) comprises a telescopic sleeve (9), and a first rotating arm (11) and a second rotating arm (12) are rotatably connected to the upper end of the telescopic sleeve (9). A measuring sensor (14) is provided at the intersection of the first rotating arm (11) and the second rotating arm (12). A positioning nut (15) is fixedly connected to the connection between the telescopic sleeve (9) and the first rotating arm (11) and the second rotating arm (12) by the same thread. The circuit structure of the device includes a main control module, a data acquisition module, a data storage module, an interaction module, a WIFI module and a power module; The main control module is mainly used for controlling the device and processing data, has multiple IO ports for programming, and is also equipped with an operating system to support the development of upper-level applications; The data acquisition module is based on a measuring sensor (14), wherein the measuring sensor (14) is provided with three groups, namely a first angle sensor (1401) for measuring the rotation angle of the first rotating arm (11), a second angle sensor (1402) for measuring the rotation angle of the second rotating arm (12), and an inclination sensor (1403) for measuring the degree of inclination of the tree trunk, and the data acquisition module also includes a digital-to-analog conversion chip PCF8591; The data storage module is mainly used to save the data obtained during the measurement process. During the tree diameter at breast height measurement process, it receives and stores the diameter at breast height measurement value from the data acquisition module; The interactive module is mainly used to display various information of the measurement process to the user in real time and receive operation instructions provided by the user; The WIFI module is built into the main control module and is used to realize wireless transmission of data; The power module is composed of a 18650 lithium battery, a battery assembly, a charger and a switch.

2. A portable forest plot rapid layout and tree diameter measurement device as claimed in claim 1, characterized in that: The first positioning wheel (2) is provided with two, namely a first upper positioning wheel (201) and a first lower positioning wheel (202); the first upper positioning wheel (201) is rotatably connected to the upper part of the support frame (1); the first lower positioning wheel (202) is rotatably connected to the lower part of the support frame (1); the rotation axis of the first upper positioning wheel (201) and the first lower positioning wheel (202) coincide; the gap between the first upper positioning wheel (201) and the first lower positioning wheel (202) is greater than the thickness of the first rotating arm (11); The second positioning wheels (3) are provided with two, namely a second upper positioning wheel (301) and a second lower positioning wheel (302); the second upper positioning wheel (301) is rotatably connected to the upper part of the support frame (1); the second lower positioning wheel (302) is rotatably connected to the lower part of the support frame (1); the rotation axes of the second upper positioning wheel (301) and the second lower positioning wheel (302) coincide; and the gap between the second upper positioning wheel (301) and the second lower positioning wheel (302) is greater than the thickness of the second rotating arm (12).

3. A portable forest sample plot rapid layout and tree diameter measurement device as claimed in claim 1, characterized in that: A tension spring (13) is provided at one end of the first rotating arm (11) and the second rotating arm (12), and two ends of the tension spring (13) are respectively fixedly connected to the first rotating arm (11) and the second rotating arm (12).

4. A portable forest sample plot rapid layout and tree diameter measurement device as claimed in claim 1, characterized in that: A telescopic rod (10) passes through the telescopic sleeve (9); when the telescopic rod (10) is stretched to its longest length, the total length of the telescopic sleeve (9) and the telescopic rod (10) is 1.3 m.

5. A portable forest plot rapid layout and tree diameter measurement device as claimed in claim 1, characterized in that: One side of the support frame (1) is fixedly connected to a first vertical pole (16), and the other side of the support frame (1) is fixedly connected to a second vertical pole (17); a winding wheel (18) is rotatably connected to the first vertical pole (16); a hand wheel (19) is fixedly connected to the upper end of the winding wheel (18); a fixed chain (20) is wound on the winding wheel (18); one end of the fixed chain (20) is fixedly connected to a hook (21); and the hook (21) is hung on the second vertical pole (17).

6. A portable forest sample plot rapid layout and tree diameter measurement device as claimed in claim 5, characterized in that: The fixed chain (20) comprises a metal chain (2001), wherein the metal chain (2001) is provided in two groups, and a rolling column (2002) is rotatably connected between the two groups of metal chains (2001).

7. A portable forest sample plot rapid layout and tree diameter measurement device as claimed in claim 1, characterized in that: The angle measuring rod (8) is used in conjunction with a sample plot marking rod (22) when used for rapid deployment of forest sample plots. A group of laser indicators (23) are respectively fixedly mounted on a first rotating arm (11) and a second rotating arm (12) on the angle measuring rod (8). The indication direction of the laser indicators (23) is consistent with that of the first rotating arm (11) and the second rotating arm (12).

8. A portable forest sample plot rapid layout and tree diameter measurement device as claimed in claim 7, characterized in that: The laser pointer (23) is fixedly mounted on the first rotating arm (11) and the second rotating arm (12) via a fixing sleeve (24); the laser pointer (23) is fixedly mounted on the fixing sleeve (24) via bolts; the fixing sleeve (24) is sleeved on the first rotating arm (11) and the second rotating arm (12); a positioning bolt (25) is threadedly connected to one side of the fixing sleeve (24); the positioning bolt (25) passes through the fixing sleeve (24), and the positioning bolt (25) abuts against the side surfaces of the first rotating arm (11) and the second rotating arm (12).

9. The portable forest sample plot rapid layout and tree diameter measurement device according to claim 1, characterized in that: The first gear hole (5) is located at the midpoint of the line connecting the bottom ends of the rotating shafts of the first positioning wheel (2) and the second positioning wheel (3); the distance between the second gear hole (6) and the first gear hole (5) is 30 mm; the distance between the third gear hole (7) and the first gear hole (5) is 60 mm; the diameters of the first positioning wheel (2) and the second positioning wheel (3) are both 120 mm; the center distance between the first positioning wheel (2) and the second positioning wheel (3) is 180 mm; and the widths of the first rotating arm (11) and the second rotating arm (12) are both 8 mm.

10. A portable forest sample plot rapid layout and tree diameter measurement device as claimed in claim 9, characterized in that: The calculation formula for the tree's diameter at breast height is: ； Wherein, R is the radius of the tree to be measured; θ is half of the sum of the angles measured by the first angle sensor (1401) and the second angle sensor (1402); W is the width of the first rotating arm (11) and the second rotating arm (12); H is the distance between the gear hole inserted into the angle measuring rod (8) and the first gear hole (5); d is the diameter of the first positioning wheel (2) and the second positioning wheel (3); and S is the center distance between the first positioning wheel (2) and the second positioning wheel (3).

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