Diameter at breast height measuring device for carbon sink calculation

Abstract

The utility model provides a diameter at breast height measuring device for carbon sink calculation, which comprises a support frame, a measuring assembly arranged on the support frame and used for measuring the diameter at breast height of a tree, and an adjusting assembly arranged on the support frame and used for adjusting the angle of the measuring assembly. The adjusting assembly comprises a ball cup arranged at one end of the supporting frame, a ball piece rotationally arranged in the ball cup and a fastening bolt arranged in the ball cup in a penetrating mode, the ball cup is matched with the ball piece, the ball piece is connected with the measuring assembly, the fastening bolt is in threaded fit with the ball cup, and the ball cup is connected with the measuring assembly. The end, extending into the ball cup, of the fastening bolt abuts against the ball piece. The device has the advantages that the device is not limited by the environment of the tree to be measured, the measurement angle can be adjusted in any direction, the practicability is high, and the measurement is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of diameter at breast height measurement, in particular to a diameter at breast height measurement device for carbon sink calculation. Background Art

[0002] Measuring the diameter at breast height (DBH) of trees (usually the diameter of the trunk at a height of 1.3 meters) is a standardized measurement method that ensures that measurement results from different researchers and different regions can be compared and analyzed uniformly. It is usually used to estimate tree biomass and carbon sinks. It is an important indicator for assessing tree size and biomass, and is of great significance for forest resource management, carbon sink assessment, and research on ecosystem services.

[0003] To facilitate the measurement of tree diameters at breast height (DBH), researchers have developed related measuring devices. For example, the utility model with authorization publication number CN206648565U describes a DBH ruler that includes a measuring rod, a tape measure detachably connected to the rod, and a tape within the tape measure. To measure, the rod is connected to the tape measure, and the tape measure is stretched to take the measurement.

[0004] However, since tree growth is affected by many factors, such as the environment and light, trees do not all grow in a vertical direction. The measuring devices in related technologies make it difficult to adjust the angle of the tape measure, which affects the measurement accuracy and causes certain deviations in the breast diameter measurement results, which is not conducive to subsequent carbon sink calculations and other work. Utility Model Content

[0005] In order to improve the existing problem that it is difficult to adjust the angle of the tape measure, which affects the measurement accuracy and is not conducive to subsequent carbon sink calculations, the utility model provides a breast diameter measurement device that is not limited by the environmental restrictions of the trees to be measured, can adjust the measurement angle in any direction, has strong practicality, and can measure more accurately.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A diameter-at-breast height measuring device for carbon sequestration calculation comprises a support frame, a measuring assembly arranged on the support frame for measuring the diameter-at-breast height of trees, and an adjusting assembly arranged on the support frame for adjusting the angle of the measuring assembly;

[0008] The adjustment assembly includes a ball head seat arranged at one end of the support frame, a ball head component rotatably arranged in the ball head seat, and a fixing bolt passing through the ball head seat. The ball head seat and the ball head component are adapted to each other, and the ball head component is connected to the measuring assembly. One end of the fixing bolt extends into the ball head seat and cooperates with the ball head seat thread. The fixing bolt extending into one end of the ball head seat abuts against the ball head component.

[0009] Using this technical solution, when measuring the DBH of a tree, the support frame is placed close to the object surrounding the tree, bringing the measuring assembly close to the tree. The fixing bolts are then loosened, driving the movable member to rotate within the ball head seat, rotating the measuring assembly to the appropriate angle so that the skew angle of the measuring assembly and the tree are aligned. The fixing bolts are then driven again to tighten the movable ball head, fixing the angle of the measuring assembly, and finally, measurement is performed using the measuring assembly. This allows the measurement angle to be adjusted at any angle, regardless of the environmental constraints of the tree being measured. This offers the advantages of high practicality and more accurate measurements, facilitating subsequent carbon sink calculations and other tasks.

[0010] Preferably, the ball head component includes a movable ball head and a connecting screw arranged on the movable ball head, one side of the movable ball head extends into the ball head seat, the ball head seat and the movable ball head are adapted to each other, the connecting screw at one end away from the movable ball head is connected to the measuring assembly, the fixing bolt extends to one end of the ball head seat and abuts against the movable ball head, and the fixing bolt sleeve at one end away from the movable ball head is provided with a handwheel.

[0011] With the above technical solution, turning the handwheel drives the set bolt to rotate, causing the set bolt to move along its length, thereby tightening or loosening the movable ball head. When the set bolt is pressed against the movable ball head, the movable ball head is clamped and fixed by the groove wall and the set bolt, thereby preventing the measurement assembly from rotating. When the set bolt is loosened, the movable ball head can rotate freely, thereby adjusting the angle of the measurement assembly in any direction, conveniently adjusting the measurement assembly from the outside of the ball head seat.

[0012] Preferably, the movable ball head is made of aluminum alloy material.

[0013] Through the above technical solution, aluminum alloy has a lighter weight and better durability than other metal materials such as steel, and is not easily deformed or damaged, which is convenient for carrying and using.

[0014] Preferably, the support frame includes a support seat, a support foot arranged on the support seat, and a support rod arranged on the support seat, the support foot is flexible, one end of the support foot is connected to the support seat, and the support rod is connected to the ball head seat.

[0015] Through the above technical solution, since the supporting legs are flexible, they can be bent and adjusted in shape at will. Therefore, by bending the three supporting legs, the three supporting legs can be grasped on any object, so that during measurement, they are not restricted by the location and environment of the tree to be measured. Different objects can be used as support points to support the measuring assembly, so that the breast diameter can be measured more conveniently through the measuring assembly.

[0016] Preferably, the supporting legs are made of ABS material.

[0017] Through the above technical solutions, ABS material has good strength and toughness, as well as certain rigidity and wear resistance. It has excellent impact resistance, is not easy to break, and has good weather resistance and chemical stability.

[0018] Preferably, the supporting feet are further provided with protrusions.

[0019] Through the above technical solution, the protrusions increase the contact area between the support foot and the object and change the shape of the surface of the support foot, thereby enhancing the friction effect, which is conducive to better grasping the object and thus better supporting the support seat, support rod and the structure on the support rod.

[0020] Preferably, the support rod is a telescopic rod.

[0021] Through the above technical solution, the support rod is a telescopic rod, which ensures that it can be easily carried and the length of the support rod can be adjusted according to the distance between the supporting object and the tree to be measured, thereby conveniently measuring the diameter at breast height of the tree to be measured.

[0022] Preferably, the measuring assembly includes a measuring tape for measuring, the measuring tape includes a rectangular outer shell and a measuring tape wound in the outer shell, and the connecting screw is connected to the outer shell.

[0023] With the above technical solution, the tree to be measured can be measured by pulling the tape out of the housing and wrapping it around the trunk of the tree to be measured, thereby calculating the diameter at breast height.

[0024] Preferably, the ruler tape is wound around the housing through a torsion spring, and a stop block is provided at the end of the ruler tape, one end of the stop block is a stop end, and the other end is an insertion end, the stop end is connected to the ruler tape, and the stop end abuts against the housing near the belt receiving port.

[0025] Through the above technical solution, the tape can be automatically retracted after the measurement is completed, while preventing the tape from being over-retracted.

[0026] Preferably, the measuring component further comprises a card block arranged on the outer shell, a slot is provided on the card block, the slot and the plug end of the block are plugged into each other, a clearance groove is provided on the block, a card block is provided in the clearance groove, a card slot is provided on the slot wall of the slot, the card block and the card slot are adapted to each other, the bottom of the clearance groove is connected to the card block by a spring, and the elastic force of the spring is greater than the elastic force of the torsion spring.

[0027] Through the above technical solution, when the plug-in end of the resisting block is inserted into the slot, the card block is squeezed by the slot wall to cause the spring to contract, and the card block gradually extends into the clearance groove. When the plug-in end is inserted into the bottom of the slot, the card block is extended into the card slot by the elastic force of the spring, thereby connecting the resisting block to the card block; when the plug-in end of the resisting block is extended out of the slot, the card block is squeezed again and extends into the clearance groove. When the plug-in end is completely extended out of the slot, the card block is reset by the spring.

[0028] When measuring, the block is placed against the tree trunk, the tape measure is pulled out from the outer shell, and after it is wrapped around the tree, the plug end of the block is inserted into the slot so that the block and the block are engaged. At this time, the tape close to the end is aligned with the tape retraction port, and the torsion spring provides a pulling force for the tape to stick to the tree trunk, making the measurement result more accurate, which is convenient for relevant personnel to count and measure.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. When measuring the DBH of a tree, bend the support legs so that they grip an object close to the tree. Stretch the support rods so that the tape measure and the fixing block are located at the appropriate position on the tree trunk (1.3 meters from the trunk). This allows you to measure the DBH of the tree regardless of the tree's environmental restrictions.

[0031] 2. Then, turn the handwheel to loosen the set bolts. Drive the movable ball head to rotate the tape measure to the appropriate angle, and place the fixed block against the tree trunk to align the tape measure with the tree to be measured. Turn the handwheel again to tighten the set bolts against the movable ball head to fix the tape measure angle. The measuring angle can be adjusted in any direction, which helps improve measurement accuracy and facilitates subsequent carbon sequestration calculations.

[0032] 3. Then, pull the tape measure out of the housing by driving the stop block. After it goes around the tree once, insert the plug end of the stop block into the slot so that the stop block and the clamping block engage with each other. At this time, the tape close to the stop end is aligned with the tape retraction opening. At the same time, the torsion spring provides a pulling force for the tape to stick to the tree trunk, thereby avoiding measurement distortion caused by loose tape or incomplete fit of the tape to the tree trunk, ensuring the accuracy and reliability of the data, making the measurement results more precise, and facilitating the counting and measurement of relevant personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0035] Figure 2 It is a cross-sectional view of the ball head seat in the embodiment of the present utility model.

[0036] Figure 3 It is a structural schematic diagram of the tape measure in an embodiment of the present utility model.

[0037] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0038] Figure 5 It is a structural schematic diagram of the fixing block in an embodiment of the present utility model.

[0039] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0040] Among them, the parts number description is:

[0041] 1. Support frame; 11. Support base; 112. Mounting slot; 12. Support foot; 13. Support rod; 2. Measuring assembly; 21. Tape measure; 211. Housing; 212. Tape measure; 213. Abutment block; 2131. Abutment end; 2132. Insertion end; 214. Clamping block; 215. Tape closing opening; 22. Fixing block; 221. Slot; 222. Clamping slot; 3. Adjustment assembly; 31. Ball head seat; 311. Ball slot; 312. Screw hole; 32. Ball head piece; 321. Movable ball head; 322. Connecting screw; 33. Tightening bolt; 34. Handwheel. DETAILED DESCRIPTION

[0042] 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 embodiments described are 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 making creative efforts are within the scope of protection of the present invention.

[0043] like Figures 1 to 6 As shown, a diameter-at-breast height measuring device for carbon sink calculation includes a support frame 1, an adjustment component 3 arranged on the support frame 1, and a measuring component 2 connected to the adjustment component 3, wherein the adjustment component 3 is used to adjust the angle of the measuring component 2, and the measuring component 2 is used to measure the diameter at breast height of the tree.

[0044] Reference Figure 1The support frame 1 includes a cylindrical support base 11, a support leg 12 provided on the support base 11, and a support rod 13 provided on the support base 11. A mounting groove 112 is provided at one end of the support base 11. The mounting groove 112 passes through the outer wall of the support base 11. In this embodiment, there are three mounting grooves 112. The three mounting grooves 112 are evenly spaced along the circumferential direction of the support base 11, and the three mounting grooves 112 are located at the same end of the support base 11. The support leg 12 is arranged in an elongated strip shape and is flexible. One end of the support leg 12 extends into the mounting groove 112 and is connected to the mounting groove 112. There are three support legs 12 corresponding to the number of mounting grooves 112. The three support legs 12 extend into the three mounting grooves 112 in a one-to-one correspondence. When three support legs 12 are used for support, three fulcrums can be provided for the support base 11. The three fulcrums can form a stable triangular structure, which is conducive to improving the stability of the support base 11 and the support rod 13.

[0045] The support legs 12 are made of ABS material, which has good strength and toughness, as well as certain rigidity and wear resistance. It has excellent impact resistance, is not easy to break, and has good weather resistance and chemical stability. That is, the support legs 12 can be bent and adjusted in shape at will. Therefore, by bending the three support legs 12, the three support legs 12 can be grasped on any object. Due to the different environments of the trees to be measured, such as the leaning trees by the lake, it is not convenient to measure the trunks when the support frame 1 is placed on the ground. Therefore, by bending the support legs 12, the support legs 12 are grasped on objects close to the trees to be measured, so that during measurement, they are not restricted by the location environment of the trees to be measured, and different objects are used as support points to support the measuring component 2, so that the diameter at breast height can be measured more conveniently through the measuring component 2.

[0046] In addition, in order to make the support foot 12 more stable when grasping an object, a plurality of protrusions are provided on the support foot 12 (not shown in the figure). The plurality of protrusions are conducive to increasing the contact area between the support foot 12 and the object and changing the shape of the surface of the support foot 12, thereby enhancing the friction effect and better grasping the object, thereby better supporting the support seat 11, the support rod 13 and the structure on the support rod 13.

[0047] Reference Figure 1 The support rod 13 is a telescopic rod. The telescopic rod is a relatively mature technology in the existing technology and will not be described in detail here. The support rod 13 is distributed along the axial direction of the support base 11. The support base 11 away from one end of the support foot 12 is connected to the support rod 13. The maximum length of the support rod 13 is preferably 2 meters to ensure that it can be easily carried while being able to adjust the length of the support rod 13 according to the distance between the supported object and the tree to be measured, so as to conveniently measure the diameter at breast height of the tree to be measured at 1.3 meters.

[0048] During measurement, the support legs 12 are bent according to the tree's surroundings, allowing them to grip an object close to the tree, such as the ground. The support rods 13 are stretched to bring the measuring assembly 2 closer to the tree. Adjustment assembly 3 adjusts the measuring assembly 2 to the appropriate angle to accommodate the tree's tilt. The measuring assembly 2 then measures the tree, obtaining a more accurate DBH (diameter at breast height) for subsequent carbon sequestration calculations.

[0049] Specifically, refer to Figure 1 and Figure 2 The adjustment assembly 3 includes a ball seat 31 connected to one end of the support rod 13, a ball head member 32 rotatably disposed within the ball seat 31, and a fixing bolt 33 passing through the ball seat 31. The ball seat 31 is cylindrical and is mounted on the support rod 13 at the end facing away from the support seat 11. The ball seat 31 is fixed to the support rod 13 by bolts. The ball head member 32 includes a spherical movable ball head 321 and a connecting screw 322 connected to the movable ball head 321. The movable ball head 321 is made of a metal material. In this embodiment, the movable ball head 321 is made of an aluminum alloy. Compared with other metal materials such as steel, aluminum alloy has a lighter weight and better durability. It is not easy to deform or damage, which is convenient for carrying and use. The connecting screw 322 is used to connect the movable ball head 321 and the measuring assembly 2 . One end of the connecting screw 322 is welded to the movable ball head 321 , and the connecting screw 322 at one end facing away from the movable ball head 321 is connected to the measuring assembly 2 .

[0050] Reference Figure 2 The ball head seat 31 at one end of the support rod 13 is provided with a ball groove 311. Approximately two-thirds of the movable ball head 321 extends into the ball groove 311, and approximately one-third of the movable ball head 321 is located outside the ball groove 311. The connecting screw 322 is also located outside the ball groove 311. The movable ball head 321 and the ball groove 311 are adapted to each other, so that the movable ball head 321 can rotate in any direction within the ball groove 311. Therefore, when adjusting the angle of the measuring assembly 2, by driving the movable ball head 321 to rotate, the measuring assembly 2 can be driven to rotate in any direction, thereby adjusting the angle of the measuring assembly 2. This makes the rotation angle of the measuring assembly 2 more comprehensive, and allows for more flexible measurement of the diameter at breast height based on the tilt direction of the tree to be measured.

[0051] Continue to refer to Figure 2The side wall of the ball seat 31 defines a screw hole 312 extending along the width of the ball seat 31 and communicating with the ball groove 311. A set bolt 33 is threadedly engaged with the screw hole 312. One end of the set bolt 33 extends into the screw hole 312 and into the ball groove 311. The end of the set bolt 33 extending into the ball groove 311 abuts against the movable ball 321. A handwheel 34 is mounted on the end of the set bolt 33 facing away from the movable ball 321. Turning the handwheel 34 rotates the set bolt 33, moving it along its length, thereby tightening or loosening the set bolt 33 against the movable ball 321. When the fastening bolt 33 is pressed against the movable ball head 321, the movable ball head 321 is clamped and fixed by the groove wall of the ball groove 311 and the fastening bolt 33, thereby preventing the measuring component 2 from rotating. When the fastening bolt 33 is loosened, the movable ball head 321 can rotate freely, thereby adjusting the angle of the measuring component 2.

[0052] When adjusting the angle of the measuring assembly 2, the fixing bolt 33 is loosened by turning the hand wheel 34, and the movable ball head 321 is driven to rotate, so that the measuring assembly 2 can be driven to rotate in any direction. The angle of the measuring assembly 2 is adjusted, and the fixing bolt 33 is pressed against the movable ball head 321 by turning the hand wheel 34 again, thereby fixing the measuring assembly 2. The measuring assembly 2 can be rotated in any direction, which is beneficial for measuring trees with different skew directions and can be measured according to different environments of the trees to be measured.

[0053] Specifically, refer to Figure 3 and Figure 4 The measuring assembly 2 includes a measuring tape 21 for measuring and a fixed block 22 provided on the measuring tape 21. The measuring tape 21 includes a rectangular parallelepiped housing 211, a tape 212 wound around the housing 211, and a stop 213 provided at the end of the tape 212. A connecting screw 322, at one end facing away from the movable ball head 321, is connected to the housing 211, and the connecting screw 322 is close to the side wall of the housing 211. A tape receiving opening 215 is provided on the housing 211, and the tape receiving opening 215 is close to a right angle side of the housing 211. The tape 212 extends out of or is retracted into the housing 211 through the tape receiving opening 215, and the connecting screw 322 is away from the tape receiving opening 215. The tape 212 is wound around the housing 211 by a torsion spring, which always provides an inward retraction force for the tape 212. The cross-section of the stop block 213 is T-shaped, with one end of the stop block 213 being a stop end 2131 and the other end being an insert end 2132. The stop end 2131 is connected to the tape 212. When the tape 212 is rolled up in the housing 211, the stop end 2131 abuts against the housing 211 near the tape retraction port 215, so that after the measurement is completed, the tape 212 can be automatically retracted, while preventing the tape 212 from being over-retracted.

[0054] Reference Figure 5 and Figure 6The fixing block 22 is disposed on the housing 211, near the tape receiving opening 215. A slot 221 is defined on the fixing block 22, facing away from the tape receiving opening 215. The slot 221 engages with the insert end 2132 of the stop block 213, and when the insert end 2132 is fully inserted into the slot 221, the tape 212 near the insert end 2131 is aligned with the tape receiving opening 215. A circular clearance groove is defined on the stop block 213, near the insert end 2132, and away from the insert end 2131. A latching slot 222 is defined in the wall of the slot 221. A hemispherical block 214 is provided in the give way groove. The block 214 and the slot 222 are adapted to each other, and the bottom of the give way groove and the block 214 are connected by a spring. The spring force is greater than the torsion spring. In the natural state, the spring force causes the block 214 to extend out of the give way groove, and the spherical surface of the block 214 faces outward. When the plug end 2132 of the stop block 213 extends into the slot 221, the clamping block 214 contracts the spring through the squeezing of the slot wall 221, and the clamping block 214 gradually extends into the clearance groove along the spherical surface. When the plug end 2132 extends into the bottom of the slot 221, the clamping block 214 extends into the clamping groove 222 due to the elastic force of the spring, thereby clamping the stop block 213 to the clamping block 214; when the plug end 2132 of the stop block 213 extends out of the slot 221, the clamping block 214 is squeezed again and extends into the clearance groove along the spherical surface. When the plug end 2132 is completely extended out of the slot 221, the clamping block 214 is reset by the spring.

[0055] When measuring, by placing the fixed block 22 against the tree trunk, the block 213 is driven to pull the measuring tape 21 out of the housing 211. After going around the tree once, the plug end 2132 of the block 213 is inserted into the slot 221, so that the block 213 is engaged with the clamping block 214. At this time, the tape 212 near the end 2131 is aligned with the tape receiving opening 215, and the torsion spring provides a pulling back force for the tape 212, thereby pressing the tape 212 against the tree trunk, avoiding measurement distortion caused by loosening of the tape 212 or incomplete fit of the tape, ensuring the accuracy and reliability of the data, making the measurement results more accurate, and facilitating the counting and measurement of relevant personnel.

[0056] The working principle of this embodiment is as follows: when measuring the DBH of a tree, bend the support leg 12 so that it grips an object close to the tree. Then, by stretching the support rod 13, the measuring tape 21 and the fixing block 22 are positioned at the appropriate position on the tree trunk (1.3 meters from the trunk). Then, by turning the handwheel 34, the fixing bolt 33 is loosened. By driving the movable ball head 321 to rotate, the measuring tape 21 is rotated to the appropriate angle, and the fixing block 22 is brought into contact with the tree trunk, so that the skew angle of the measuring tape 21 and the tree are aligned. The handwheel 34 is then turned again to tighten the fixing bolt 33 against the movable ball head 321, fixing the angle of the measuring tape 21. Then, the measuring tape 21 is pulled out of the housing 211 by driving the stop block 213. After it goes around the tree once, the plug end 2132 of the stop block 213 is inserted into the slot 221, so that the stop block 213 is engaged with the clamping block 214. At this time, the tape 212 close to the stop end 2131 is aligned with the tape receiving opening 215. At the same time, the torsion spring provides a pulling force for the tape 212 to be pulled back, thereby pressing the tape 212 against the tree trunk, avoiding measurement distortion caused by the tape 212 being loose or not fully fitting the trunk, ensuring the accuracy and reliability of the data, making the measurement results more accurate, and facilitating the counting and measurement of relevant personnel.

[0057] Therefore, the measurement angle can be adjusted in any direction according to the degree of tilt of the tree to be tested, regardless of the environmental restrictions of the tree to be tested. It has the advantages of strong practicality and more accurate measurement, which is conducive to subsequent calculation of carbon sinks and other work.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A diameter-at-breast height measuring device for carbon sink calculation, comprising a support frame (1), and a measuring assembly (2) disposed on the support frame (1) for measuring the diameter-at-breast height of trees, characterized in that: The support frame (1) is provided with an adjustment component (3) for adjusting the angle of the measuring component (2); The adjusting assembly (3) comprises a ball head seat (31) arranged at one end of the support frame (1), a ball head component (32) rotatably arranged in the ball head seat (31), and a fixing bolt (33) passing through the ball head seat (31); the ball head seat (31) and the ball head component (32) are adapted to each other; the ball head component (32) is connected to the measuring assembly (2); one end of the fixing bolt (33) extends into the ball head seat (31) and is threadedly engaged with the ball head seat (31); the fixing bolt (33) extending into one end of the ball head seat (31) abuts against the ball head component (32).

2. The device for measuring diameter at breast height for carbon sink calculation according to claim 1, characterized in that: The ball head component (32) includes a movable ball head (321) and a connecting screw (322) arranged on the movable ball head (321); one side of the movable ball head (321) extends into the ball head seat (31); the ball head seat (31) and the movable ball head (321) are adapted to each other; the connecting screw (322) at one end away from the movable ball head (321) is connected to the measuring component (2); the fixing bolt (33) extends to one end of the ball head seat (31) and abuts against the movable ball head (321); the fixing bolt (33) at one end away from the movable ball head (321) is sleeved with a hand wheel (34).

3. The device for measuring diameter at breast height for carbon sink calculation according to claim 2, characterized in that: The movable ball head (321) is a ball head made of aluminum alloy material.

4. The device for measuring diameter at breast height for carbon sink calculation according to claim 1, characterized in that: The support frame (1) comprises a support seat (11), a support foot (12) arranged on the support seat (11), and a support rod (13) arranged on the support seat (11); the support foot (12) is flexible, one end of the support foot (12) is connected to the support seat (11), and the support rod (13) is connected to the ball head seat (31).

5. The device for measuring diameter at breast height for carbon sink calculation according to claim 4, characterized in that: The supporting foot (12) is made of ABS material.

6. The device for measuring diameter at breast height for carbon sink calculation according to claim 4, characterized in that: The supporting foot (12) is also provided with a convex point.

7. The device for measuring diameter at breast height for carbon sink calculation according to claim 4, characterized in that: The support rod (13) is a telescopic rod.

8. The device for measuring diameter at breast height for carbon sink calculation according to claim 4, characterized in that: The measuring assembly (2) comprises a measuring tape (21) for measuring, wherein the measuring tape (21) comprises a rectangular parallelepiped housing (211), a tape (212) wound in the housing (211), and the ball head (32) is connected to the housing (211).

9. The device for measuring diameter at breast height for carbon sink calculation according to claim 8, characterized in that: The ruler tape (212) is wound around the housing (211) via a torsion spring. A stop block (213) is provided at the end of the ruler tape (212). One end of the stop block (213) is a stop end (2131), and the other end is an insertion end (2132). The stop end (2131) is connected to the ruler tape (212), and the stop end (2131) abuts against the housing (211) near the belt receiving opening (215).

10. The device for measuring diameter at breast height for carbon sink calculation according to claim 9, characterized in that: The measuring assembly (2) further comprises a clamping block (214) arranged on the housing (211); a slot (221) is provided on the clamping block (214); the slot (221) is plugged into and matched with the plug end (2132) of the retaining block; a clearance groove is provided on the retaining block (213); the clamping block (214) is provided in the clearance groove; a clamping groove (222) is provided on a groove wall of the slot (221); the clamping block (214) and the clamping groove (222) are adapted to each other; the bottom of the clearance groove and the clamping block (214) are connected via a spring; the elastic force of the spring is greater than the elastic force of the torsion spring.

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