A forest carbon sink tree diameter measuring device

Abstract

The utility model discloses a kind of measurement forest carbon sink tree breast height diameter measuring devices, it is related to tree breast height diameter measuring device technical field, including a kind of measurement forest carbon sink tree breast height diameter measuring device, including measuring scale, the inner wall surface of the measuring scale is equipped with guide slot, the inner wall surface of the measuring scale is provided with fixed groove, the outer wall surface of the measuring scale is equipped with mark limit slot, the guide slot is equipped with sliding slot in, the sliding slot is provided with the mark structure for identifying scale;The utility model has the advantages that by adopting the connection of the cooperation and sliding connection such as magnetic attraction such as magnetic attraction block and trapezoidal adsorption block and sliding block and sliding slot, friction block and guide hole, the connection of this structure reduces the hard friction and collision between components, reduces the degree of wear, and simplifies reading process, solve the problem that existing measuring instrument needs to manually rotate antiskid button before each degree, operation process is more complicated.

Description

Technical Field

[0001] This utility model relates to the technical field of tree diameter at breast height (DBH) measuring devices, and in particular to a device for measuring the DBH of trees used for measuring forest carbon sequestration. Background Technology

[0002] Tree diameter at breast height (DBH) measuring instruments are specialized devices used to accurately determine the DBH of trees. They are fundamental tools for assessing forest carbon sequestration capacity. Common types include mechanical calipers, tree measuring tapes, and digital DBH meters. Among them, digital instruments are widely used due to their high accuracy and ease of operation. Mechanical instruments (such as calipers) achieve measurement through vernier or graduated scales. During operation, the two measuring feet are placed against the trunk to directly read the value, with an accuracy of up to 0.1 cm. Digital instruments integrate sensors and displays, automatically recording and storing data. Some support Bluetooth transmission to terminals, reducing errors from manual recording. Some high-end instruments are also equipped with laser ranging functions, which can simultaneously measure trunk tilt and automatically correct the diameter value. These instruments are lightweight and portable (weighing mostly 200-500 grams), adaptable to complex field environments. Their measurement data are key parameters for calculating individual tree biomass and estimating forest carbon storage, and are widely used in forest resource surveys, carbon sequestration project monitoring, and other fields. A search revealed patent number CN221975994U, which discloses an instrument for measuring the diameter at breast height (DBH) of trees used for forest carbon sequestration. The instrument includes a measuring scale, a control box with a cavity in which the measuring scale is slidably connected; a retaining ring fixedly connected to the control box with a groove in which the measuring scale is connected; a movable plate slidably connected to the cavity to restrict the movement of the measuring scale; a threaded post threadedly connected to the control box, one end of which is rotatably connected to the movable plate; and a spirit level connected to the control box. This invention can monitor in real time whether the measuring scale remains horizontal, ensuring the instrument remains level even in complex terrain and environments, thereby reducing errors caused by tool tilt and improving measurement accuracy. However, this measuring instrument requires manual rotation of the anti-slip knob before each reading, which is cumbersome. Furthermore, the anti-slip texture cannot be replaced, and once damaged, the entire instrument becomes unusable. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a device for measuring the diameter at breast height (DBH) of trees in forest carbon sequestration. Existing measuring instruments require manual rotation of the anti-slip knob before each measurement, which is cumbersome. Furthermore, the anti-slip texture cannot be replaced, and once damaged, the entire instrument becomes unusable.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is a device for measuring the diameter at breast height (DBH) of trees used for measuring forest carbon sequestration, comprising a measuring ruler, a guide groove and a fixing groove on the inner wall of the measuring ruler, a marking and limiting groove on the outer wall of the measuring ruler, a sliding groove in the guide groove, and a marking structure for marking the scale in the sliding groove; the marking structure includes a transmission box and a slider, guide holes are provided on the upper and lower walls of the transmission box and are slidably connected to the inner wall of the guide groove, the slider is fixedly installed on the rear wall of the transmission box and is slidably connected to the sliding groove, a pressing groove is provided on the front wall of the transmission box, a pressing block is slidably connected in the pressing groove, a marking pin is fixedly installed on the pressing block, a magnetic block is fixedly installed on the side wall inside the transmission box, and two spring limiting rods are fixedly installed on the upper and lower walls inside the transmission box respectively.

[0005] As a further embodiment of this utility model: a trapezoidal adsorption block is fixedly installed on the rear wall of the pressing block to restrict the movement of the pressing block in the pressing groove. Two friction blocks are slidably connected to the two waists of the trapezoidal adsorption block, and the two friction blocks are slidably connected to the two guide holes respectively.

[0006] As a further embodiment of this utility model: a support plate is fixedly installed on the rear wall surface of the two friction blocks, and two spring fixing rods are fixedly installed on the two support plates respectively, and are respectively matched with four spring limiting rods. A reset spring is fitted on each of the four spring limiting rods and is connected to the four spring fixing rods.

[0007] As a further embodiment of this utility model: anti-slip strips are connected to the upper and lower ends of the inside of the fixing groove and are slidably connected to the fixing groove. Connecting heads are fixedly installed at the connecting ends of the two anti-slip strips, and the connecting ends of the connecting heads are connected to the measuring ruler by screws.

[0008] As a further embodiment of this utility model: the inner wall of the measuring ruler is provided with a measuring groove, a guide belt is slidably connected in the measuring groove, and a pushing belt is fixedly installed on the inner wall of the guide belt.

[0009] As a further embodiment of this utility model, an anti-slip ring is fixedly provided on the inner wall surface of the measuring ruler.

[0010] As a further embodiment of this utility model: the outer wall surface of the measuring ruler is engraved with scale lines.

[0011] As a further embodiment of this utility model: three levels are fixedly installed on the upper wall of the measuring ruler.

[0012] The present invention adopts the above technical solution and has the following advantages compared with the prior art: By combining magnetic adsorption, such as the combination of magnetic blocks and trapezoidal adsorption blocks, with sliding connections such as sliders and grooves, friction blocks and guide holes, this structure reduces hard friction and collision between components, reduces wear, and simplifies the reading process. It solves the problem that existing measuring instruments require manual rotation of the anti-slip knob before each reading, which is a cumbersome operation. During operation, the operator can remove the anti-slip strip from the fixing groove through the connector, which enables convenient replacement of the anti-slip strip. This ensures that the anti-slip strip always maintains good friction performance, guarantees stable contact between the device and the tree, and improves the fixation effect and accuracy during measurement. It solves the problem that the anti-slip pattern of existing measuring instruments cannot be replaced, and once damaged, the entire instrument is unusable. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the measuring ruler structure of this utility model; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the transmission box structure of this utility model; Figure 5 This is a schematic diagram of the push belt structure of this utility model.

[0014] In the diagram: 1. Measuring ruler; 2. Guide groove; 3. Fixing groove; 4. Marking and limiting groove; 5. Slide groove; 6. Transmission box; 7. Slider; 8. Guide hole; 9. Pressing groove; 10. Pressing block; 11. Marking pin; 12. Magnetic block; 13. Spring limiting rod; 14. Trapezoidal adsorption block; 15. Friction block; 16. Support plate; 17. Spring fixing rod; 18. Return spring; 19. Anti-slip strip; 20. Connector; 21. Screw; 22. Measuring groove; 23. Guide belt; 24. Push belt; 25. Anti-slip ring; 26. Scale line; 27. Level. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0016] Please see Figures 1-5A device for measuring the diameter at breast height (DBH) of trees in forests for carbon sequestration includes a measuring ruler 1. The inner wall of the measuring ruler 1 has a guide groove 2 and a fixing groove 3. The outer wall of the measuring ruler 1 has a marking and limiting groove 4. A sliding groove 5 is provided within the guide groove 2, and a marking structure for marking the scale is provided within the sliding groove 5. The marking structure includes a transmission box 6 and a slider 7. Guide holes 8 are provided on the upper and lower walls of the transmission box 6 and are slidably connected to the inner wall of the guide groove 2. The slider 7 is fixedly installed on the rear wall of the transmission box 6 and is slidably connected to the sliding groove 5. A pressing groove 9 is provided on the front wall of the transmission box 6, and a pressing block 10 is slidably connected within the pressing groove 9. A marking pin 11 is fixedly installed on the pressing block 10. A magnetic block 12 is fixedly installed on the side wall inside the transmission box 6. Two spring limiting rods 13 are fixedly installed on the upper and lower walls inside the transmission box 6, respectively.

[0017] Please see Figure 4 A trapezoidal adsorption block 14 is fixedly installed on the rear wall of the pressing block 10 to restrict the movement of the pressing block 10 in the pressing groove 9. Two friction blocks 15 are slidably connected to the two waists of the trapezoidal adsorption block 14, and the two friction blocks 15 are slidably connected to the two guide holes 8 respectively.

[0018] Please see Figure 4 Support plates 16 are fixedly installed on the rear walls of the two friction blocks 15. Two spring fixing rods 17 are fixedly installed on the two support plates 16 respectively, and they are matched with four spring limiting rods 13 respectively. Reset springs 18 are respectively fitted on the four spring limiting rods 13 and connected to the four spring fixing rods 17.

[0019] Please see Figure 3 The upper and lower ends of the fixed groove 3 are respectively connected to anti-slip strips 19 and are slidably connected to the fixed groove 3. The connecting ends of the two anti-slip strips 19 are fixedly installed with connectors 20, and the connecting ends of the connectors 20 are connected to the measuring ruler 1 with screws 21.

[0020] Please see Figure 5 The inner wall of the measuring ruler 1 is provided with a measuring groove 22, and a guide belt 23 is slidably connected in the measuring groove 22. A push belt 24 is fixedly installed on the inner wall of the guide belt 23.

[0021] Please see Figure 2 The inner wall of the measuring ruler 1 is fixedly equipped with an anti-slip ring 25. When in use, the guide belt 23 is slowly pulled, which drives the push belt 24 to slide along the measuring groove 22. At this time, the measuring ruler 1 gradually contracts due to the pulling force of the push belt 24, and the anti-slip ring 25 on the inner wall (made of rubber with anti-slip texture on the surface) gradually adheres tightly to the tree trunk. The device is initially fixed by friction, and the gradual tightening is achieved.

[0022] Please see Figure 2The outer wall of the measuring ruler 1 is engraved with scale lines 26. When using it, the operator should keep the line of sight at the same level as the indicator needle 11 and the scale lines 26, and read the scale value pointed to by the indicator needle 11.

[0023] Please see Figure 2 Three levels 27 are fixedly installed on the upper wall of the measuring ruler 1. When in use, when the measuring ruler 1 is tightened to fit the tree trunk, the anti-slip ring 25 further prevents the device from sliding or rotating during the measurement process. Then observe the three levels 27 on the upper wall of the measuring ruler 1: if the bubble is off-center, slightly adjust the position of the measuring ruler 1 (rotate left and right or adjust the height up and down) until the bubbles of the three levels are all centered; then ensure that the measuring ruler 1 is in a horizontal state.

[0024] In this embodiment, during operation, the operator can use the connector 20 to remove the anti-slip strip 19 from the fixing groove 3, enabling convenient replacement of the anti-slip strip 19. This ensures that the anti-slip strip 19 always maintains good friction performance, guaranteeing stable contact between the device and the tree, thereby improving the fixation effect and accuracy during measurement. By combining magnetic adsorption, such as the cooperation between the magnetic block 12 and the trapezoidal adsorption block 14, with sliding connections such as the slider 7 and the groove 5, and the friction block 15 and the guide hole 8, this structure reduces hard friction and collision between components, reduces wear, helps extend the overall service life of the device, and reduces maintenance costs.

[0025] Specifically, according to the forest carbon sequestration measurement specifications, the tree diameter at breast height (DBH) measurement point is 1.3m above the ground on the trunk (if there is a protrusion, fork, or depression at 1.3m on the trunk, it can be adjusted to the nearest straight point above). The operator uses an auxiliary tool (such as a height measuring rod) to mark a horizontal circumference line at 1.3m on the trunk as the measurement benchmark; align the open end of the measuring ruler 1 with the benchmark line and wrap it around the circumference of the trunk, so that the inner wall surface of the measuring ruler 1 (the side with the anti-slip ring 25) fits against the surface of the trunk; pull out the guide belt 23 (with built-in push belt 24) from the telescopic end of the measuring ruler 1, and insert the free end of the guide belt 23 into the measuring groove 22 at the other end of the measuring ruler 1; then slowly pull the guide belt 23, driving the push belt 24 along the measuring groove 22. 2. Sliding: At this point, the measuring ruler 1 gradually contracts due to the pulling force of the pushing belt 24, and the anti-slip ring 25 on the inner wall (made of rubber with anti-slip texture on the surface) gradually adheres tightly to the tree trunk. The friction force is used to initially fix the device and achieve gradual tightening. When the measuring ruler 1 is tightened to fit the tree trunk, the anti-slip ring 25 further prevents the device from sliding or rotating during the measurement process. Then, observe the three levels 27 on the upper wall of the measuring ruler 1: if the bubble is off-center, slightly adjust the position of the measuring ruler 1 (rotate left and right or adjust the height up and down) until the bubbles of the three levels are all centered. Ensure that the measuring ruler 1 is in a horizontal state to avoid the measurement direction not being perpendicular to the cross-section of the tree trunk due to the tilt of the device, which would result in an error of too large or too small in the diameter at breast height reading. The operator then presses the pressing block 10 inward along the pressing groove 9, causing the trapezoidal adsorption block 14 on the rear wall to move into the transmission box 6. The inclined waist surface of the trapezoidal adsorption block 14 presses against the friction blocks 15 on both sides, causing the friction blocks 15 to slide outward along the guide hole 8 until they are in close contact with the anti-slip strip 19 in the fixing groove 3 (friction limits the movement of the transmission box 6). At the same time, the trapezoidal adsorption block 14 is attracted by the magnetic block 12 in the transmission box 6, maintaining a stable state. During the movement of the pressing block 10, the front end of the marking needle 11 simultaneously approaches the outer wall of the measuring scale 1, and finally the needle tip accurately points to the corresponding position of the scale line 26, completing the measurement point marking (at this time, the reset spring 18 is compressed by the spring fixing rod 17, reserving elasticity for subsequent reset). The operator keeps the line of sight at the same level as the marking needle 11 and the scale line 26, and reads the scale value pointed to by the marking needle 11. Afterwards, the pressing block 10 is pulled out, the reset spring 18 releases its elastic force, and pushes the spring fixing rod 17 to drive the support plate 16 and friction block 15 to reset. The trapezoidal adsorption block 14 separates from the magnetic adsorption block 12, and the transmission box 6 can slide freely along the guide groove 2, which is convenient for removing the device or performing repeated measurements. This embodiment is suitable for measuring the diameter at breast height of common forest tree species such as larch, fir, and poplar. Especially in scenarios where the trunk surface is uneven (such as bark protrusions), the anti-slip ring 25 and anti-slip strip 19 work together to prevent slipping, and the level 27 is precisely calibrated to meet the accuracy requirements of forest carbon sequestration for monitoring tree growth.

[0026] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A device for measuring the diameter at breast height (DBH) of trees used for measuring carbon sequestration in forests, comprising a measuring ruler (1), characterized in that, The inner wall of the measuring ruler (1) is provided with a guide groove (2), the inner wall of the measuring ruler (1) is provided with a fixing groove (3), the outer wall of the measuring ruler (1) is provided with a marking limiting groove (4), the guide groove (2) is provided with a sliding groove (5), and the sliding groove (5) is provided with a marking structure for marking the scale. The marking structure includes a transmission box (6) and a slider (7). The upper and lower walls of the transmission box (6) are provided with guide holes (8) and are slidably connected to the inner wall of the guide groove (2). The slider (7) is fixedly installed on the rear wall of the transmission box (6) and is slidably connected to the slide groove (5). The front wall of the transmission box (6) is provided with a pressing groove (9). A pressing block (10) is slidably connected in the pressing groove (9). A marking pin (11) is fixedly installed on the pressing block (10). A magnetic block (12) is fixedly installed on the side wall inside the transmission box (6). Two spring limit rods (13) are fixedly installed on the upper and lower walls inside the transmission box (6).

2. The device for measuring the diameter at breast height (DBH) of trees in forest carbon sequestration according to claim 1, characterized in that, The rear wall of the pressing block (10) is fixedly installed with a trapezoidal adsorption block (14) that restricts the movement of the pressing block (10) in the pressing groove (9). Two friction blocks (15) are slidably connected to the two waists of the trapezoidal adsorption block (14), and the two friction blocks (15) are slidably connected to the two guide holes (8).

3. The device for measuring the diameter at breast height (DBH) of trees in forest carbon sinks according to claim 2, characterized in that, Support plates (16) are fixedly installed on the rear wall surfaces of the two friction blocks (15). Two spring fixing rods (17) are fixedly installed on the two support plates (16) respectively, and they are matched with four spring limiting rods (13). Reset springs (18) are respectively fitted on the four spring limiting rods (13) and connected to the four spring fixing rods (17).

4. The device for measuring the diameter at breast height (DBH) of trees used for measuring forest carbon sequestration according to claim 1, characterized in that, The upper and lower ends of the fixed groove (3) are respectively connected to anti-slip strips (19) and are slidably connected to the fixed groove (3). The connecting ends of the two anti-slip strips (19) are fixedly installed with connectors (20). The connecting ends of the connectors (20) are connected to the measuring ruler (1) with screws (21).

5. The device for measuring the diameter at breast height (DBH) of trees used for measuring forest carbon sequestration according to claim 1, characterized in that, The inner wall of the measuring ruler (1) is provided with a measuring groove (22), and a guide belt (23) is slidably connected in the measuring groove (22). A push belt (24) is fixedly installed on the inner wall of the guide belt (23).

6. The device for measuring the diameter at breast height (DBH) of trees used for measuring forest carbon sequestration according to claim 1, characterized in that, The inner wall of the measuring ruler (1) is fixedly provided with an anti-slip ring (25).

7. The device for measuring the diameter at breast height (DBH) of trees used for measuring forest carbon sequestration according to claim 1, characterized in that, The outer wall of the measuring ruler (1) is engraved with scale lines (26).

8. The device for measuring the diameter at breast height (DBH) of trees used for measuring forest carbon sequestration according to claim 1, characterized in that, Three levels (27) are fixedly installed on the upper wall of the measuring ruler (1).

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