Forestry multifunctional measuring instrument

Abstract

The present application relates to the technical field of forestry, and particularly relates to a forestry multifunctional measuring instrument, which comprises an upper shell, a lower shell is installed at the bottom of the upper shell, a strip-shaped opening is formed at a corner of the lower shell, a measuring soft band is inserted into the strip-shaped opening, scale lines are brushed on one side surface of the measuring soft band, a center column is rotatably installed in the lower shell, the measuring soft band is wound on the center column, a stud is connected to one end of the measuring soft band away from the center column, a base for being placed on the ground is arranged on the lower side of the stud, a plurality of column rods connected in a head-to-tail manner are arranged between the base and the stud, the uppermost column rod is detachably connected to the stud, and the lowermost column rod is detachably connected to the base. The present application has the following beneficial effects: one person can complete the circumference measurement of a tree trunk with any roughness, the limitation of two-person cooperative operation is eliminated, the on-site personnel deployment is reduced, the investigation period of the whole forest area is shortened, and the labor input for field survey is reduced.

Description

Technical Field

[0001] This invention relates to the field of forestry technology, specifically a multifunctional forestry measuring instrument. Background Technology

[0002] Tree diameter measurement is an essential basic operation in forestry resource surveys, forest land planning, and forest asset assessment. Obtaining trunk diameter data can provide core basis for forest volume calculation, pruning and harvesting plan formulation, and forest land ecological monitoring. In field forest operations, flexible measuring tape is commonly used to complete tree diameter detection by wrapping the trunk, which is simple to operate and adaptable to various tree trunk shapes.

[0003] The forest contains numerous robust, mature trees with large trunks. The reach of a single worker's arm is limited, making it difficult to completely encircle the trunk with a measuring strap, hindering the closure of the strap and enabling independent completion of the survey. When dealing with large-diameter trees, only two workers can be deployed on-site. One holds one end of the strap against the trunk surface, while the other pulls the strap around the trunk, aligning the scales and recording the readings. The entire measurement process requires two people working together. In large-scale forest surveys and large-scale explorations of contiguous forest areas, the wide distribution and large number of large-diameter trees necessitate two workers per tree, significantly impacting on-site manpower. Splitting limited field personnel into groups not only prolongs the survey period and reduces overall fieldwork efficiency but also increases labor costs. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a multifunctional forestry measuring instrument to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a multifunctional forestry measuring instrument, comprising an upper housing, a lower housing installed at the bottom of the upper housing, a strip-shaped opening at a corner of the lower housing, a measuring soft strap inserted into the strip-shaped opening, a scale line painted on one side of the measuring soft strap, a central column rotatably installed inside the lower housing, the measuring soft strap wrapped around the central column, a column head being snapped onto the end of the measuring soft strap away from the central column, a base for placing on the ground being provided on the lower side of the column head, and a plurality of column rods connected end to end between the base and the column head, the uppermost column rod being detachably connected to the column head, and the lowermost column rod being detachably connected to the base. The upper and lower shells integrate a retractable measuring strap. The measuring strap forms an independent vertical support through the column head, multi-segment spliced ​​column, and ground base. A single person can pull the measuring strap around the tree trunk by holding the upper and lower shells. The weight of the base, together with the column, stabilizes and fixes the end of the measuring strap. It can complete the circumference measurement of tree trunks of any thickness without the assistance of others. A single device can independently complete the circumference measurement of a single tree, reducing the number of field personnel required in forest areas and shortening the survey period for the entire forest area. At the same time, the segmented splicing of the base and column can be adapted to the measurement scenarios of various tree trunks of different heights and sizes.

[0006] Specifically, a rectangular opening is provided on the upper surface of the upper housing, and a display screen is installed inside the rectangular opening. A laser ranging module is installed on one side of the upper housing. A save button, a power button, a laser ranging button, and a reset button are installed on the upper surface of the upper housing. A circuit board is installed inside the upper housing. The save button, power button, laser ranging button, and reset button are all electrically connected to the input terminal of the circuit board. The display screen and the laser ranging module are electrically connected to the output terminal of the circuit board. A voice broadcast module is soldered on the circuit board, and multiple amplification holes are provided on one side of the upper housing near the voice broadcast module. Equipped with a laser ranging module, it can measure the spacing between trees, row spacing, and the length and width of forest land. With multi-functional operation buttons, the measurement data is transmitted to the display screen for visualization in real time. The built-in voice broadcast module, combined with the amplification holes, allows for audible reading of values ​​in strong light, cloudy days, and dim forest environments. Measurement values ​​can be saved to the circuit board storage unit with one click, eliminating the need for paper records in the field and reducing the risk of data loss. One device can perform surveying functions such as tree trunk circumference and forest land distance, improving the overall efficiency of field forestry surveys.

[0007] Specifically, a pull buckle is installed at the end of the measuring tape away from the central column. A limiting plate is installed at the end of the central column inside the lower housing. The measuring tape is positioned on the side of the limiting plate away from the circuit board. A circular opening is provided in the center of the side of the lower housing away from the upper housing. The end of the central column away from the limiting plate is rotatably mounted in the circular opening. A toggle part is installed at the end of the central column outside the lower housing to rotate the central column under applied force. The limiting plate at one end of the central column isolates the measuring tape on the side of the circuit board, preventing scratching of internal electronic components during the winding process. The toggle part can be manually rotated to drive the central column to rotate. After measurement, the measuring tape can be quickly retracted. The pull buckle, in conjunction with the clamp on the column head, quickly positions the ruler end. The winding and unwinding are smooth during multiple consecutive tree measurements.

[0008] Specifically, two clamping plates are symmetrically installed on the upper surface of the column head. The end of the measuring strap near the buckle is inserted between the two clamping plates. One side of each clamping plate is threaded with a clamping screw to limit the relative position of the measuring strap and the clamping plate. The symmetrical clamping plates hold the end of the measuring strap, and the clamping screw tightens and limits its position, preventing relative slippage between the measuring strap and the clamping plates. Disassembly and assembly are simple. When changing to different lengths of column, simply loosen the clamping screw to adjust the length of the measuring strap. It is suitable for both short columns for small trees and long columns for large trees. The circumference values ​​are stable during the measurement process, preventing repeated measurements due to slippage of the measuring tape and reducing ineffective operations in the field.

[0009] Specifically, one side of the clamping plate has a through hole, and a nut arranged concentrically with the through hole is provided on the outside of the through hole. The nut is connected and fixed to the clamping plate. A clamping screw is internally threaded into the nut, and one end of the clamping screw passes through the through hole and contacts the measuring soft band. The nut ensures a stable connection between the clamping screw and the clamping plate, and the through hole facilitates the clamping screw passing through the clamping plate.

[0010] Specifically, a first threaded head is installed at the upper end of the column rod, and the first threaded head is arranged concentrically with the column rod. A second threaded head is installed at one edge of the upper surface of the base. The first threaded head on one column rod is threadedly connected to another column rod. The first threaded head on the uppermost column rod is threadedly connected to the column head, and the second threaded head on the lowermost column rod is threadedly connected to the second threaded head on the base. The first and second threaded heads facilitate the assembly of the column rod, column head, and base.

[0011] Specifically, a first blind hole is formed on the lower surface of the column head, and a second blind hole is formed on the lower surface of the column rod. The depths of the first and second blind holes are equal, and their inner diameters are equal. Internal threaded sleeves are installed at the lower parts of both the first and second blind holes. The first threaded head on the uppermost column rod is threaded into the internal threaded sleeve in the first blind hole. The first threaded head on one column rod is threaded into the internal threaded sleeve on another column rod. The second threaded head is threaded into the internal threaded sleeve on the lowermost column rod. By screwing the first and second threaded heads into their corresponding internal threaded sleeves, the assembly of the column rod, column head, and base is completed.

[0012] Specifically, compression springs are provided at the upper positions of both the first and second blind holes. A plug for real-time sealing of the internal threaded sleeve is inserted inside the internal threaded sleeve. A limiting disc is installed at the end of the plug away from the internal threaded sleeve. Limiting discs are slidably installed in both the first and second blind holes. The outer diameter of the limiting disc is equal to the outer diameter of the internal threaded sleeve. One end of the compression spring contacts the end of the limiting disc away from the plug. When the first and second threaded heads separate from the internal threaded sleeve, the plug moves into the internal threaded sleeve under the rebound force of the compression springs, thus achieving real-time shielding and concealment of the internal threaded sleeve and preventing small debris from entering the threads of the internal threaded sleeve.

[0013] Specifically, the base has a rectangular structure, and each of the four corners on the upper surface of the base has a screw hole, with a long bolt threaded into each screw hole. When the ground is uneven, the long bolts in the screw holes are tightened so that the lower end of the long bolt contacts the ground, and thus, supported by the four long bolts, the base can be placed stably on the uneven ground.

[0014] Specifically, a storage box for storing counterweights is installed at the center of the upper surface of the base. The storage box is open at the top and is positioned between four long bolts. Adding counterweights such as mud blocks from the ground into the storage box lowers the center of gravity of the support structure formed by the base and columns, thus improving stability.

[0015] The beneficial effects of this invention are: During measurement, the base is placed stably on the ground, and the corresponding length of the column is spliced ​​together as needed, so that the uppermost column is connected to the column head and the lowermost column is connected to the base. The relative position of the measuring tape end and the column head is restricted by two clamps. At this time, the position of one end of the measuring tape is restricted. The operator only needs to hold the structure formed by the upper and lower shells and pull the measuring tape around the tree trunk. The measuring tape end is supported by the structure formed by the column, base and column head. No other person is needed to fix it. A single person can complete the circumference measurement of tree trunks of any thickness, get rid of the limitation of two-person collaborative work, reduce the allocation of on-site personnel, shorten the survey period of the entire forest area, and reduce the manual input of field survey.

[0016] When assembling multiple rods between the base and the column head, the first threaded head and the second threaded head are threadedly connected to the corresponding internal threaded sleeve. At this time, the plug is squeezed and drives the limiting plate to slide in the corresponding first blind hole and second blind hole. At this time, the compression spring is further squeezed. When the first threaded head and the second threaded head are separated from the internal threaded sleeve, the plug moves into the internal threaded sleeve under the action of the compression spring's rebound force, so as to realize the real-time shielding and hiding of the internal threaded sleeve and prevent small debris from entering the thread pattern of the internal threaded sleeve at will. Attached Figure Description

[0017] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a multifunctional forestry measuring instrument according to the present invention; Figure 2 This is another perspective view of a multi-functional forestry measuring instrument according to the present invention; Figure 3 This is an exploded structural diagram of the measuring soft belt, central column, lower shell, and upper shell in a forestry multifunctional measuring instrument of the present invention; Figure 4 This is a schematic diagram of the assembly of the column rod and column head in a multifunctional forestry measuring instrument of the present invention; Figure 5 This is a cross-sectional assembly diagram of the column rod and column head in a multifunctional forestry measuring instrument of the present invention; Figure 6 This is an exploded structural diagram of the internal threaded sleeve, rod, and head in a forestry multifunctional measuring instrument of the present invention. Figure 7 This is an exploded view of the internal threaded sleeve, column rod, and column head in a forestry multifunctional measuring instrument of the present invention. Figure 8 This is an assembly diagram of the second threaded head, storage box, and base in a forestry multifunctional measuring instrument of the present invention; In the picture: 100. Upper housing; 101. Lower housing; 1011. Strip-shaped opening; 102. Display screen; 103. Circuit board; 1031. Switch button; 1032. Laser rangefinder button; 1033. Save button; 1034. Reset button; 1035. Speaker hole; 104. Laser rangefinder module; 200. Measuring strap; 201. Buckle; 202. Center post; 2021. Actuating part; 2022. Limiting plate; 300, Column head; 301, Clamping plate; 3011, Clamping screw; 3012, Nut; 3013, First blind hole; 302, Column rod; 3021, Second blind hole; 3022, First threaded head; 303, Base; 3031, Long bolt; 3032, Storage box; 3033, Second threaded head; 3034, Threaded hole; 304, Internal threaded sleeve; 3041, Compression spring; 3042, Limiting plate; 3043, Plug. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] Please see Figures 1-8 This invention provides a technical solution: a multifunctional forestry measuring instrument, including an upper housing 100, a lower housing 101 mounted on the bottom of the upper housing 100, a rectangular opening on the upper surface of the upper housing 100, a display screen 102 installed inside the rectangular opening, a laser ranging module 104 mounted on one side of the upper housing 100, a save button 1033, a power button 1031, a laser ranging button 1032, and a reset button 1034 mounted on the upper surface of the upper housing 100, and a circuit board 103 installed inside the upper housing 100. The save button 1033, power button 1031, laser ranging button 1032, and reset button 1034 are all electrically connected to the input terminal of the circuit board 103. The display screen 102 and the laser ranging module 104 are electrically connected to the output terminal of the circuit board 103. A sound broadcast module is soldered on the circuit board 103. Multiple amplification holes 1035 are opened on one side of the upper housing 100 near the sound broadcast module. The laser ranging module 104, the display screen 102 and the voice broadcast module are integrated. In addition to measuring the trunk circumference, it can also measure the distance between trees and the distance between forest land at the same time. After the measurement is completed, the data can be saved with one click. The display screen 102 provides intuitive readings and voice broadcasts. The values ​​can be clearly read even in strong light and poor visibility conditions in the field. There is no need to carry multiple sets of tools such as tape measures, rangefinders and notebooks, which reduces the burden of field operations and improves the efficiency of comprehensive forest land surveys.

[0020] A strip-shaped opening 1011 is provided at a corner of the lower housing 101. A measuring soft strap 200 is inserted into the strip-shaped opening 1011. One side of the measuring soft strap 200 is painted with scale lines. A central post 202 is rotatably mounted inside the lower housing 101. The measuring soft strap 200 is wound around the central post 202. A pull buckle 201 is installed at the end of the measuring soft strap 200 away from the central post 202. A limit plate 2022 is installed at the end of the central post 202 inside the lower housing 101. The measuring soft strap 200 is positioned on the side of the limit plate 2022 away from the circuit board 103. The lower housing 101 is back A circular opening is provided at the center of the side of the upper housing 100. The end of the central column 202 away from the limiting plate 2022 is rotatably installed in the circular opening. The end of the central column 202 located outside the lower housing 101 is equipped with a toggle part 2021 for rotating the central column 202 under force. The limiting plate 2022 at one end of the central column 202 isolates the measuring soft tape 200 on one side of the circuit board 103. The winding process will not scratch the internal electronic components. The toggle part 2021 can be manually rotated to drive the central column 202 to rotate. After the measurement is completed, the measuring soft tape 200 is quickly retracted.

[0021] The end of the measuring strap 200 furthest from the central post 202 is secured to a post head 300. Two clamping plates 301 are symmetrically mounted on the upper surface of the post head 300. The end of the measuring strap 200 near the buckle 201 is inserted between the two clamping plates 301. One side of one clamping plate 301 is threaded with a clamping screw 3011 to limit the relative position of the measuring strap 200 and the clamping plate 301. One side of one clamping plate 301 has a through hole, and a nut 3012 is arranged concentrically with the through hole on the outside of the through hole. The nut 3012 is connected and fixed to one of the clamping plates 301, and the clamping screw is threaded into the nut 3012. 3011, one end of the clamping screw 3011 passes through the through hole and contacts the measuring soft band 200. The nut 3012 ensures a stable connection between the clamping screw 3011 and the clamping plate 301. The through hole allows the clamping screw 3011 to pass through the clamping plate 301. The symmetrical clamping plates 301 clamp the end of the measuring soft band 200 and, together with the clamping screw 3011, tighten and limit the position. There is no relative sliding between the measuring soft band 200 and the clamping plate 301. It is easy to disassemble and assemble. When changing the column 302 of different lengths, you only need to loosen the clamping screw 3011 to adjust the length of the measuring soft band 200. It is suitable for two working conditions: short columns for small trees and long columns for thick trees.

[0022] The column head 300 has a base 303 on its lower side for placement on the ground. The base 303 has a rectangular structure, and screw holes 3034 are opened at the four corners of the upper surface of the base 303. Long bolts 3031 are threaded into the screw holes 3034. A storage box 3032 for storing counterweights is installed in the middle of the upper surface of the base 303. The upper end of the storage box 3032 is open. The storage box 3032 is positioned between the four long bolts 3031. When the ground is uneven, the long bolts 3031 in the screw holes 3034 are turned so that the lower ends of the long bolts 3031 contact the ground. With the support of the four long bolts 3031, the base 303 can be placed stably on the uneven ground. Adding counterweights such as mud blocks to the storage box 3032 will lower the center of gravity of the support structure formed by the base 303, column 302, etc., and improve stability.

[0023] Multiple end-to-end column rods 302 are provided between the base 303 and the column head 300. The uppermost column rod 302 is detachably connected to the column head 300, and the lowermost column rod 302 is detachably connected to the base 303. During measurement, the base 303 is placed stably on the ground, and the column rods 302 of the corresponding length are spliced ​​as needed, so that the uppermost column rod 302 is connected to the column head 300 and the lowermost column rod 302 is connected to the base 303. The relative position of the end of the measuring soft strap 200 and the column head 300 is restricted by two clamps 301. With this setup, the position of one end of the measuring soft strap 200 is restricted. The operator only needs to hold the structure formed by the upper shell 100 and the lower shell 101 and pull the measuring soft strap 200 around the tree trunk. The measuring soft strap 200 is supported by the structure formed by the column 302, the base 303 and the column head 300. No assistance from others is required to fix it. A single person can complete the circumference measurement of tree trunks of any thickness, get rid of the limitation of two-person collaborative operation, reduce the allocation of on-site personnel, shorten the survey period of the entire forest area, and reduce the manual input of field survey.

[0024] A first threaded head 3022 is installed on the upper end of the column rod 302, and the first threaded head 3022 is concentrically arranged with the column rod 302. A second threaded head 3033 is installed on one edge of the upper surface of the base 303. A first blind hole 3013 is opened on the lower surface of the column head 300, and a second blind hole 3021 is opened on the lower surface of the column rod 302. The depth of the first blind hole 3013 is equal to the depth of the second blind hole 3021, and the inner diameter of the first blind hole 3013 is equal to the inner diameter of the second blind hole 3021. An internal threaded sleeve 304 is installed at the lower part of the first blind hole 3013 and the lower part of the second blind hole 3021, so that the first threaded head 3022 on the uppermost column rod 302 is threaded. A threaded head 3022 is threaded into the internal threaded sleeve 304 inside the first blind hole 3013, and a first threaded head 3022 on one column 302 is threaded into the internal threaded sleeve 304 on another column 302, and a second threaded head 3033 is threaded into the internal threaded sleeve 304 on the lowest column 302, thus completing the threaded connection between the first threaded head 3022 on one column 302 and the other column 302. The first threaded head 3022 on the uppermost column 302 is threaded into the column head 300, and the second threaded head 3033 on the lowest column 302 is threaded into the base 303.

[0025] Compression springs 3041 are provided at the upper part of the first blind hole 3013 and the upper part of the second blind hole 3021. A plug 3043 for real-time sealing of the internal threaded sleeve 304 is inserted inside the internal threaded sleeve 304. A limiting plate 3042 is installed at the end of the plug 3043 away from the internal threaded sleeve 304. The limiting plate 3042 is slidably installed in both the first blind hole 3013 and the second blind hole 3021. The outer diameter of the limiting plate 3042 is equal to the outer diameter of the internal threaded sleeve 304. One end of the compression spring 3041 contacts the end of the limiting plate 3042 away from the plug 3043. When multiple rods 302 are assembled between the base 303 and the column head 300... The first threaded head 3022 and the second threaded head 3033 are threadedly connected to the corresponding internal threaded sleeve 304. At this time, the plug 3043 is squeezed and drives the limiting plate 3042 to slide in the corresponding first blind hole 3013 and second blind hole 3021. At this time, the compression spring 3041 is further squeezed. When the first threaded head 3022 and the second threaded head 3033 are separated from the internal threaded sleeve 304, the plug 3043 moves into the internal threaded sleeve 304 under the action of the rebound force of the compression spring 3041, so as to realize the real-time shielding and hiding of the internal threaded sleeve 304 and prevent small debris from entering the thread of the internal threaded sleeve 304 at will.

[0026] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multifunctional forestry measuring instrument, comprising an upper housing (100), characterized in that: The lower housing (101) is installed at the bottom of the upper housing (100). A strip-shaped opening (1011) is provided at a corner of the lower housing (101). A measuring soft strap (200) is inserted into the strip-shaped opening (1011). A scale line is painted on one side of the measuring soft strap (200). A central column (202) is rotatably installed inside the lower housing (101). The measuring soft strap (200) is wrapped around the central column (202). A column head (300) is snapped onto the end of the measuring soft strap (200) away from the central column (202). A base (303) for placing on the ground is provided on the lower side of the column head (300). A plurality of column rods (302) connected end to end are provided between the base (303) and the column head (300). The uppermost column rod (302) is detachably connected to the column head (300), and the lowermost column rod (302) is detachably connected to the base (303).

2. The forestry multifunctional measuring instrument according to claim 1, characterized in that: The upper housing (100) has a rectangular opening on its upper surface, and a display screen (102) is installed inside the rectangular opening. A laser ranging module (104) is installed on one side of the upper housing (100). A save button (1033), a switch button (1031), a laser ranging button (1032), and a reset button (1034) are installed on the upper surface of the upper housing (100). A circuit board (103) is installed inside the upper housing (100). The save button (1033), the switch button (1031), the laser ranging button (1032), and the reset button (1034) are all electrically connected to the input terminal of the circuit board (103). The display screen (102) and the laser ranging module (104) are electrically connected to the output terminal of the circuit board (103). A sound broadcasting module is soldered on the circuit board (103). Multiple sound amplification holes (1035) are opened on one side of the upper housing (100) near the sound broadcasting module.

3. The forestry multifunctional measuring instrument according to claim 2, characterized in that: The measuring soft strap (200) is equipped with a buckle (201) at one end away from the central column (202). The central column (202) is equipped with a limiting plate (2022) at one end inside the lower housing (101). The measuring soft strap (200) is located on the side of the limiting plate (2022) away from the circuit board (103). A circular opening is provided in the middle of the side of the lower housing (101) away from the upper housing (100). The end of the central column (202) away from the limiting plate (2022) is rotatably installed in the circular opening. The end of the central column (202) outside the lower housing (101) is equipped with a toggle part (2021) for rotating the central column (202) under applied force.

4. A forestry multifunctional measuring instrument according to claim 3, characterized in that: Two clamping plates (301) are symmetrically installed on the upper surface of the column head (300). The end of the measuring soft strap (200) near the buckle (201) is inserted between the two clamping plates (301). One side of the clamping plate (301) is threaded with a clamping screw (3011) for limiting the relative position of the measuring soft strap (200) and the clamping plate (301).

5. A multi-functional forestry measuring instrument according to claim 4, characterized in that: A through hole is provided on one side of the clamping plate (301), and a nut (3012) is provided on the outside of the through hole and arranged concentrically with the through hole. The nut (3012) is connected and fixed to the clamping plate (301). A clamping screw (3011) is connected to the internal thread of the nut (3012). One end of the clamping screw (3011) passes through the through hole and contacts the measuring soft band (200).

6. A forestry multifunctional measuring instrument according to claim 4, characterized in that: The upper end of the column (302) is equipped with a first threaded head (3022), which is concentrically arranged with the column (302). A second threaded head (3033) is installed on one side edge of the upper surface of the base (303). The first threaded head (3022) on one column (302) is threadedly connected to another column (302). The first threaded head (3022) on the uppermost column (302) is threadedly connected to the column head (300), and the lowermost column (302) is threadedly connected to the second threaded head (3033) on the base (303).

7. A forestry multifunctional measuring instrument according to claim 6, characterized in that: The lower surface of the column head (300) is provided with a first blind hole (3013), and the lower surface of the column rod (302) is provided with a second blind hole (3021). The depth of the first blind hole (3013) is equal to the depth of the second blind hole (3021), and the inner diameter of the first blind hole (3013) is equal to the inner diameter of the second blind hole (3021). The lower part of the first blind hole (3013) and the lower part of the second blind hole (3021) are both equipped with internal thread sleeves (304). The first thread head (3022) on the uppermost column rod (302) is threaded into the internal thread sleeve (304) in the first blind hole (3013). The first thread head (3022) on one column rod (302) is threaded into the internal thread sleeve (304) on another column rod (302). The second thread head (3033) is threaded into the internal thread sleeve (304) on the lowermost column rod (302).

8. A multi-functional forestry measuring instrument according to claim 7, characterized in that: Compression springs (3041) are provided at the upper part of the first blind hole (3013) and the upper part of the second blind hole (3021). A plug (3043) for real-time sealing of the internal threaded sleeve (304) is inserted inside the internal threaded sleeve (304). A limiting plate (3042) is installed at the end of the plug (3043) away from the internal threaded sleeve (304). The limiting plate (3042) is slidably installed in the first blind hole (3013) and the second blind hole (3021). The outer diameter of the limiting plate (3042) is equal to the outer diameter of the internal threaded sleeve (304). One end of the compression spring (3041) is in contact with the end of the limiting plate (3042) away from the plug (3043).

9. A multi-functional forestry measuring instrument according to claim 1, characterized in that: The base (303) has a rectangular structure. Screw holes (3034) are provided at the four corners of the upper surface of the base (303). Long bolts (3031) are threaded into the screw holes (3034).

10. A multifunctional forestry measuring instrument according to claim 9, characterized in that: A storage box (3032) for storing counterweights is installed in the middle of the upper surface of the base (303). The upper end of the storage box (3032) is open and the storage box (3032) is located between four long bolts (3031).

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