Field surveying and mapping device for forestry investigation

Abstract

The invention relates to the technical field of surveying and mapping devices, in particular to a field surveying and mapping device for forestry investigation, the field surveying and mapping device comprises a surveying instrument, a tripod and a strap, the top end of the strap is fixedly connected with a pair of shoulder straps, and the bottom ends of the two sides of the strap are fixedly connected with waistbands. A surveying and mapping person only needs to wear structures such as the straps, the shoulder straps, the waist belt and the fixing plate on the body, then after surveying and mapping are finished, the butt joint groove in the fixing plate is inserted into the butt joint disc on the surveying and mapping instrument, the limitation of the surveying and mapping instrument on the tripod can be relieved by rotating the stud, the surveying and mapping instrument is fixed to the fixing plate, and then the surveying and mapping instrument can be taken away. The surveying instrument is carried in front of the chest and does not need to be carried in a storage box, carrying is convenient, the straps are fixed to the body of a surveying and mapping person through the shoulder straps and the waistband to be carried, the body mechanics is better met, and carrying is more labor-saving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of surveying and mapping devices, and particularly relates to a field surveying and mapping device for forestry investigation. BACKGROUND

[0002] The forestry investigation is now entirely dependent on surveying and mapping instruments to complete spatial data collection. Field personnel set up an RTK receiver or total station on the top of a centering rod, and through a Bluetooth connection, the instrument uses satellite or laser ranging to obtain three-dimensional coordinates of the survey point. The coordinates are directly written into a vector file, and the subsequent import into a geographic information system automatically generates small class boundaries and sample plots, and realizes rapid mapping of forest edges, forest class lines and sample plots for volume investigation.

[0003] However, the existing box-type surveying and mapping equipment is designed for urban surveying and mapping scenes, and two major systemic defects are exposed after entering the forest area. Firstly, the operation process is complicated. In order to protect the surveying and mapping instrument, the surveying and mapping instrument needs to be placed in the storage box for carrying during carrying. However, in the process of forestry investigation, the surveying and mapping points in the forest are widely distributed, and it is difficult to walk in the forest. When the surveying and mapping point is changed each time, the surveying and mapping instrument needs to be removed from the tripod and placed in the storage box, which takes a long time. If the surveying and mapping instrument is not placed in the storage box for carrying, it is not only physically consuming to carry by hand or shoulder, but also the GNSS mainboard, IMU sensor and optical lens are frequently repaired due to falling, knocking and raining, which greatly reduces the convenience of the surveying and mapping device in the process of forestry investigation.

[0004] Therefore, a field surveying and mapping device for forestry investigation is proposed to solve the above problems. SUMMARY

[0005] The purpose of the present application is to solve the problems in the background art, and a field surveying and mapping device for forestry investigation is proposed.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a field surveying and mapping device for forestry investigation, comprising a surveying and mapping instrument, a tripod and a backpack, the top end of the backpack is fixedly connected with a pair of shoulder straps, the bottom end of the backpack on both sides is fixedly connected with a waist belt, a V-shaped belt is arranged between the shoulder straps, the top end of the V-shaped belt is connected with the side wall of the shoulder strap through an upper insertion buckle, the middle part of the V-shaped belt is fixedly connected with a T-shaped plate at the bottom end, the T-shaped plate on both sides is connected with the side wall of the waist belt through a lower insertion buckle, the front side of the T-shaped plate is fixedly connected with a fixed plate, the top end of the fixed plate is provided with a butt joint groove, the inner wall of the butt joint groove on both sides is provided with an upper limiting hole, the bottom end of the surveying and mapping instrument is fixedly connected with a butt joint disc, the bottom end of the butt joint disc is fixedly connected with a T-shaped fixed frame, the top end of the tripod is provided with a slot matched with the fixed frame, the bottom end of the slot is provided with a pair of lower limiting grooves, the outer wall of the butt joint disc on both sides is fixedly connected with a rectangular block, and the butt joint disc is provided with a conversion mechanism for flexible conversion of the installation position of the surveying and mapping instrument.

[0007] Further, the upper and lower inserts are length-adjustable structures, the T-shaped plate is fixedly connected with a protective pad on the inner side, a plurality of reflective strips are pasted on the rear side of the strap at equal intervals, the T-shaped plate and the fixed plate are made of aluminum alloy, and the strap, the shoulder strap, the protective pad, the waistband and the V-shaped band are made of cloth.

[0008] Further, a pair of guide blocks are fixedly connected to the inner wall of the butt joint groove on both sides, and a guide groove matched with the guide blocks is formed on the side away from each other between the rectangular blocks.

[0009] Further, the conversion mechanism comprises a stud, a cross slot is formed in the top end of the butt joint disc, the stud is threadedly connected to the front side of the butt joint disc, a sliding plate is slidably connected to the vertical end of the cross slot, right-angle blocks with inclined surfaces are fixedly connected to the two sides of the sliding plate, the inclined surfaces between the right-angle blocks are arranged on the side away from each other, moving plates are slidably connected to the two sides of the horizontal end of the cross slot, limit rods are fixedly connected to the side walls of the moving plates and arranged through the outer walls of the butt joint disc and the rectangular block on the side away from each other, the side wall of the stud is rotatably connected to the front side of the sliding plate, a pair of vertical plates are slidably connected to the bottom end of the fixed frame, a connecting plate is fixedly connected between the top ends of the vertical plates, a top rod is fixedly connected to the top end of the connecting plate, a release slot is formed in the bottom end of the sliding plate, and the rear side of the release slot is inclinedly arranged.

[0010] Further, the top end of the top rod is arranged as a smooth circular arc surface, the top end of the top rod is in contact with the bottom end of the sliding plate, and an upper spring is fixedly connected between the bottom end of the fixed frame and the bottom end of the connecting plate.

[0011] Further, the side walls of the moving plates and the side walls of the cross slot are fixedly connected with lower springs.

[0012] Further, a pair of T-shaped grooves are formed in the top end of the rear side of the T-shaped plate, a mounting groove is formed in the top end of each T-shaped groove, a T-shaped block is inserted into the inner side of each T-shaped groove, a rear plate is fixedly connected between the rear sides of the T-shaped blocks, a protective bag is hingedly connected to the top end of the rear plate, a sub-magic strip is fixedly connected to each of the two sides of the bottom end of the front side of the protective bag, and a mother magic sticker is fixedly connected to the position above the sub-magic strip on the front side of the protective bag.

[0013] Further, a through slot is fixedly connected to each of the two sides of the top end of the fixed plate, and a fixed rod is fixedly connected to the inner side of each through slot.

[0014] Compared with the prior art, the present application has the following advantages: 1. This invention, through the design of a carrying strap, a fixing plate, and a conversion mechanism, allows surveyors to simply wear the carrying strap, shoulder strap, waist belt, and fixing plate. After surveying, the docking slot on the fixing plate is inserted into the docking plate on the surveying instrument. By rotating the stud, the surveying instrument is released from its tripod and fixed to the fixing plate, allowing it to be removed and carried in front of the chest without needing to be stored in a case. This not only makes it convenient to carry, but the carrying strap, secured to the surveyor's body by the shoulder strap and waist belt, is more ergonomic and less strenuous. Similarly, during installation, simply open the tripod, reverse the direction of the measuring instrument, and repeat the above steps to insert it, making the assembly and disassembly process more convenient.

[0015] 2. The present invention, through the design of a protective bag, a sub-Velcro strap, and a mother Velcro strap, can protect the surveying instrument mounted on the fixed plate, ensuring its protection while walking in the forest. At the same time, the protective bag can be disassembled and assembled according to the actual situation, greatly improving the flexibility of the device. Attached Figure Description

[0016] Figure 1 This is a side perspective structural diagram of the surveying instrument and carrying strap of the present invention; Figure 2 This is a rear-view three-dimensional structural diagram of the strap, surveying instrument, and tripod of the present invention. Figure 3 Appendix of the present invention Figure 2 A magnified view of the structure at point A in the middle; Figure 4 This is a top-view perspective view of the three-dimensional structure of the tripod, docking plate, and fixing plate of the present invention. Figure 5 Appendix of the present invention Figure 4 A magnified schematic diagram of the structure at point B in the middle; Figure 6 This is a three-dimensional structural diagram of the docking plate of the present invention, viewed from below. Figure 7 This is a bottom-view perspective view of the sliding plate, limiting rod, and vertical plate of the present invention. Figure 8 This is a side perspective structural diagram of the shoulder strap, protective bag, tripod, and surveying instrument of the present invention. Figure 9 This is a rear-view perspective view of the three-dimensional structure of the shoulder strap and protective bag combination of the present invention; Figure 10 This is a three-dimensional structural diagram of the protective bag of the present invention, viewed from below.

[0017] In the diagram: 1. Surveying instrument; 2. Tripod; 3. Shoulder strap; 4. Shoulder strap; 5. Waist belt; 6. V-belt; 7. Upper buckle; 8. T-plate; 9. Lower buckle; 10. Fixing plate; 11. Connecting groove; 12. Upper limit hole; 13. Connecting plate; 14. Fixing frame; 15. Slot; 16. Lower limit groove; 17. Pad; 18. Guide block; 19. Rectangular block; 20. Guide groove; 21. Reflective strip; 22. Screw 23. Column; 24. Cross groove; 25. Sliding plate; 26. Right angle block; 27. Moving plate; 28. Limiting rod; 29. ​​Vertical plate; 30. Connecting plate; 31. Top rod; 32. Release groove; 33. Lower spring; 34. T-slot; 35. Mounting groove; 36. T-block; 37. Rear plate; 38. Protective bag; 39. Through groove; 40. Fixing rod; 41. Female Velcro; 42. Upper spring. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0020] In practical use, it was found that the existing box-type surveying equipment is designed for urban surveying scenarios. When it enters forest areas, it exposes two major systemic defects. First, the operation process is cumbersome. In order to protect the surveying instrument 1, it needs to be carried in a storage box. However, during forestry surveys, the surveying points in the forest are widely distributed and walking in the forest is difficult. Every time the surveying point is changed, the surveying instrument 1 needs to be removed from the tripod 2 and placed in the storage box, which takes a long time. If it is not carried in the storage box, carrying it by hand while climbing mountains is not only physically demanding, but also causes the GNSS motherboard, IMU sensor and optical lens to be frequently repaired due to drops, bumps and rain. This greatly reduces the convenience of the surveying device in the forestry survey process. To solve the above problems, the following structure was invented.

[0021] like Figures 1-10The field surveying device shown includes a surveying instrument 1, a tripod 2, and a carrying strap 3. A pair of shoulder straps 4 are fixedly connected to the top of the carrying strap 3, and waist belts 5 are fixedly connected to the bottom ends of both sides of the carrying strap 3. A V-shaped strap 6 is provided between the shoulder straps 4. The top of the V-shaped strap 6 is connected to the side wall of the shoulder strap 4 via an upper buckle 7. A T-shaped plate 8 is fixedly connected to the bottom middle of the V-shaped strap 6. The two sides of the T-shaped plate 8 are connected to the side walls of the waist belt 5 via lower buckles 9. A fixing plate 10 is fixedly connected to the front of the T-shaped plate 8. A docking groove 11 is provided through the top of the plate 10. Upper limit holes 12 are provided on both sides of the inner wall of the docking groove 11. A docking plate 13 is fixedly connected to the bottom of the surveying instrument 1. A T-shaped fixing frame 14 is fixedly connected to the bottom of the docking plate 13. A slot 15 that matches the fixing frame 14 is provided at the top of the tripod 2. A pair of lower limit slots 16 are provided at the bottom of the slot 15. Rectangular blocks 19 are fixedly connected to both sides of the outer wall of the docking plate 13. A conversion mechanism for flexibly changing the installation position of the surveying instrument 1 is provided on the docking plate 13. Both the upper snap fastener 7 and the lower snap fastener 9 are length-adjustable structures. Both rely on two elastic latches engaging with the female snap groove to achieve quick connection and separation; pressing the latches disengages them in one go. The length adjustment of the upper snap fastener 7 and the lower snap fastener 9 is achieved via a U-shaped triangular buckle. One end of the webbing is fixed, and the other end passes through the central horizontal bar of the buckle body, forming an S-shaped path. Pulling the free end shortens the length, and pulling in the opposite direction lengthens it. This is a mature snap fastener component in existing technology and will not be described in detail here. A protective pad 17 is fixedly connected to the inner side of the T-shaped plate 8. The 17 setting can isolate and protect the T-shaped board 8 from the surveyor's stomach, improving the comfort of the surveyor during the wearing process. Several reflective strips 21 are equidistantly pasted on the back of the shoulder strap 3. The reflective strips 21 make the surveyor more visible under the light after wearing, improving the safety of the forestry survey and mapping process. The T-shaped board 8 and the fixing plate 10 are both made of aluminum alloy, which is lightweight and easy to carry. The shoulder strap 3, shoulder strap 4, pad 17, waist belt 5 and V-belt 6 are all made of fabric. A pair of guide blocks 18 are fixedly connected to both sides of the inner wall of the docking groove 11. Guide grooves 20 adapted to the guide blocks 18 are opened on the opposite side of the rectangular blocks 19. By setting the guide blocks 18 and guide grooves 20, the positioning function can be activated when the docking plate 13 is inserted into the docking groove 11 to ensure accurate docking and avoid affecting the normal operation of the subsequent conversion mechanism. The conversion mechanism includes a stud 22, a cross groove 23 at the top of the mating plate 13, the stud 22 being threaded through and connected to the front side of the mating plate 13, a sliding plate 24 being slidably connected to the vertical end of the cross groove 23, right-angled blocks 25 with inclined surfaces being fixedly connected to both sides of the sliding plate 24, and the inclined surfaces between the right-angled blocks 25 being set on the opposite side, a moving plate 26 being slidably connected to both sides of the horizontal end of the cross groove 23, a limit rod 27 being fixedly connected through the sidewall of the moving plate 26, and the limit rod 27 being set through the outer wall of the mating plate 13 and the rectangular block 19 on the opposite side, the sidewall of the stud 22 being rotatably connected to the front side of the sliding plate 24, a pair of vertical plates 28 being slidably connected through the bottom of the fixed frame 14, a connecting plate 29 being fixedly connected between the top ends of the vertical plates 28, a top rod 30 being fixedly connected to the top end of the connecting plate 29, and a release groove 31 being opened at the bottom of the sliding plate 24, with the rear side of the release groove 31 being inclined. The top end of the push rod 30 is set as a smooth arc surface. The top end of the push rod 30 contacts the bottom end of the sliding plate 24. An upper spring 42 is fixedly connected between the bottom end of the fixed frame 14 and the bottom end of the connecting plate 29. The limiting rods 27 are all set with smooth arc surfaces on the side closest to each other, and the side wall of the moving plate 26 and the side wall of the cross groove 23 are fixedly connected with a lower spring 32. During forestry surveying and mapping, the surveyor first opens the upper buckle 7 and the lower buckle 9, then places the T-shaped plate 8 with the surveying instrument 1 in front of his chest, and then places the shoulder strap 3 behind his back. Next, the shoulder strap 4 passes over the surveyor's shoulders and is connected to the V-shaped strap 6 through the upper buckle 7. Then, the waist belt 5 passes through both sides of the surveyor's waist and is connected to both sides of the T-shaped plate 8 through the lower buckle 9. After adjusting the tightness, the surveying instrument 1 can be carried into the forest. When the surveying location is reached, the tripod 2 can be opened and placed in the designated surveying location. Then, the surveyor wearing the shoulder strap 3 stands in front of the tripod 2. Then, the fixing frame 14 of the T-shaped structure at the bottom of the surveying instrument 1 is inserted into the slot 15 of the T-shaped structure. Then, the stud 22 is rotated outward. Since the sliding plate 24 can only slide laterally in the cross groove 23, the outward rotation of the stud 22 will pull the sliding plate 24 forward. Simultaneously, the inclined surface of the right-angle block 25 gradually moves away from the limit rod 27, gradually releasing the pressure on the limit rod 27. Subsequently, under the elastic force of the lower spring 32, the moving plate 26 and the limit rod 27 slide out from the upper limit hole 12, releasing the connection between the surveying instrument 1 and the fixed plate 10. During this process, the sliding plate 24 will move the release groove 31 away from the top rod 30 through the sliding. Then, when the release groove 31 is about to move out, the top rod 30 will slide down along the inclined surface of the release groove 31. The sliding plate 24 is moved to the bottom and the upper spring 42 is gradually compressed. The downward movement of the push rod 30 will drive the connecting plate 29 and the vertical plate 28 to move down, so that the vertical plate 28 is inserted into the corresponding lower limit groove 16, which restricts the sliding position of the fixed frame 14 and the surveying instrument 1, thereby locking the surveying instrument 1 to the tripod 2 and completing the quick installation of the surveying instrument 1. Finally, the surveyor wearing the back strap 3 pulls the fixed plate 10 out of the surveying instrument 1, and after adjusting the level of the surveying instrument 1, the forestry survey and mapping can be carried out. Once the survey is complete, insert the docking slot 11 on the fixing plate 10 into the docking plate 13, and insert the guide block 18 into the corresponding guide slot 20. Then, rotate the stud 22 in the opposite direction and repeat the above operation. The upper spring 42 will pull the vertical plate 28 out of the lower limit slot 16 and squeeze the limit rod 27 into the corresponding upper limit hole 12. This will disconnect the surveying instrument 1 from the tripod 2 and fix the surveying instrument 1 on the fixing plate 10. The surveying instrument 1 can then be pulled out of the tripod 2 and pulled out of the slot 15 in the fixing frame 14. After that, put away the tripod 2 and carry the surveying instrument 1 and the tripod 2 to the next surveying point for surveying.

[0022] In summary, with the above structural design, surveyors only need to wear the back strap 3, shoulder strap 4, waist belt 5, and fixing plate 10. After surveying, the docking slot 11 on the fixing plate 10 is inserted into the docking plate 13 on the surveying instrument 1. By rotating the stud 22, the restriction of the surveying instrument 1 on the tripod 2 can be released, and the surveying instrument 1 can be fixed on the fixing plate 10. The surveying instrument 1 can then be taken away and carried in front of the chest without needing to be placed in a storage box. This not only makes it convenient to carry, but the back strap 3 is also more ergonomically designed to be fixed to the surveyor's body through the shoulder strap 4 and waist belt 5, making it easier to carry. Similarly, during installation, simply open the tripod 2, reverse the above operation to insert the surveying instrument 1, and the installation and disassembly process is more convenient.

[0023] Based on the above embodiments, it was found during use that although the above structure facilitates the assembly and disassembly of the surveying instrument 1 during forestry surveys, during transport, since the surveying instrument 1 is not protected, foreign objects and rainwater in the forest can easily fall onto the surveying instrument 1, causing damage to the surveying instrument 1 and thus affecting the normal progress of field surveying work. In order to solve the above problems, further improvements were made to the above structure.

[0024] A pair of T-slots 33 are provided at the top rear side of the T-shaped plate 8. A mounting groove 34 is provided at the top of the T-slots 33. A T-block 35 is inserted into the inner side of the T-slots 33. A rear plate 36 is fixedly connected between the rear sides of the T-blocks 35. A protective bag 37 is hinged to the top of the rear plate 36. Sub-Velvet strips 40 are fixedly connected to both sides of the bottom front side of the protective bag 37. A female Velcro 41 is fixedly connected to the front side of the protective bag 37 above the sub-Velvet strips 40. Both sides of the top of the fixed plate 10 are fixedly connected with through grooves 38, and the inside of the through grooves 38 are fixedly connected with fixed rods 39. Before using the equipment, when the protective bag 37 is needed, first loosen the upper buckle 7, then pass the V-belt 6 and T-plate 8 between the back plate 36 and the protective bag 37. Next, insert the back plate 36 of the protective bag 37 into the mounting slot 34 via the T-block 35. Then, lower the back plate 36 so that the T-block 35 slides into the T-slot 33, thus completing the installation of the protective bag 37. The surveyor can then put it on. After installing the surveying instrument 1 onto the fixing plate 10, the protective bag 37 can be placed... Flip the protective bag 37 down to cover the measuring instrument 1 on the fixing plate 10. Then, pass the sub-Velvet strip 40 on the protective bag 37 between the slot 38 and the fixing rod 39. Then, pass the sub-Velvet strip 40 under the fixing rod 39 and stick it on the mother Velcro 41 to fix the protective bag 37. This will protect the measuring instrument 1 during carrying. Finally, when you need to take out the measuring instrument 1, you can pull the sub-Velvet strip 40 out of the mother Velcro 41 and then flip the protective bag 37 up to open it.

[0025] In summary, the above-described structure provides protection for the surveying instrument 1 mounted on the fixed plate 10, ensuring its protection while walking in the forest. Furthermore, the protective bag 37 can be disassembled and reassembled as needed, greatly improving the device's flexibility.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention.

[0027] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A field surveying device for forestry surveys, characterized in that: The device includes a surveying instrument (1), a tripod (2), and a carrying strap (3). A pair of shoulder straps (4) are fixedly connected to the top of the carrying strap (3). Waist belts (5) are fixedly connected to the bottom of both sides of the carrying strap (3). A V-shaped strap (6) is provided between the shoulder straps (4). The top of the V-shaped strap (6) is connected to the side wall of the shoulder strap (4) through an upper buckle (7). A T-shaped plate (8) is fixedly connected to the bottom of the middle of the V-shaped strap (6). The sides of the T-shaped plate (8) are connected to the side wall of the waist belt (5) through lower buckles (9). A fixing plate (10) is fixedly connected to the front of the T-shaped plate (8). The top of the fixing plate (10) is... The end is provided with a docking groove (11), and upper limit holes (12) are provided on both sides of the inner wall of the docking groove (11). The bottom end of the surveying instrument (1) is fixedly connected to a docking plate (13), and the bottom end of the docking plate (13) is fixedly connected to a T-shaped fixing frame (14). The top end of the tripod (2) is provided with a slot (15) that matches the fixing frame (14). The bottom end of the slot (15) is provided with a pair of lower limit slots (16). The outer walls of the docking plate (13) are fixedly connected to rectangular blocks (19). The docking plate (13) is provided with a conversion mechanism for flexibly changing the installation position of the surveying instrument (1).

2. The field surveying device for forestry surveys according to claim 1, characterized in that: The upper buckle (7) and lower buckle (9) are both length-adjustable structures. The inner side of the T-shaped plate (8) is fixedly connected with a pad (17). Several reflective strips (21) are equidistantly pasted on the back of the shoulder strap (3). The T-shaped plate (8) and the fixing plate (10) are both made of aluminum alloy. The shoulder strap (3), shoulder strap (4), pad (17), waist belt (5) and V-belt (6) are all made of fabric.

3. The field surveying device for forestry surveys according to claim 1, characterized in that: A pair of guide blocks (18) are fixedly connected to both sides of the inner wall of the docking groove (11), and guide grooves (20) adapted to the guide blocks (18) are opened on the opposite side of the rectangular blocks (19).

4. The field surveying device for forestry surveys according to claim 1, characterized in that: The conversion mechanism includes a stud (22), and a cross groove (23) is provided at the top of the docking plate (13). The stud (22) is threaded through and connected to the front side of the docking plate (13). A sliding plate (24) is slidably connected to the vertical end of the cross groove (23). Right-angled blocks (25) with inclined surfaces are fixedly connected to both sides of the sliding plate (24), and the inclined surfaces between the right-angled blocks (25) are set on opposite sides. Moving plates (26) are slidably connected to both sides of the horizontal end of the cross groove (23), and the side walls of the moving plates (26) are fixedly connected through. There is a limit rod (27), and the limit rod (27) is set through the outer wall of the dock (13) and the rectangular block (19) on the opposite side. The side wall of the stud (22) is rotatably connected to the front side of the sliding plate (24). A pair of vertical plates (28) are slidably connected through the bottom end of the fixed frame (14). A connecting plate (29) is fixedly connected between the top ends of the vertical plates (28). A top rod (30) is fixedly connected to the top end of the connecting plate (29). A release groove (31) is opened at the bottom end of the sliding plate (24), and the rear side of the release groove (31) is inclined.

5. A field surveying device for forestry investigation according to claim 4, characterized in that: The top end of the top rod (30) is set as a smooth arc surface. The top end of the top rod (30) is in contact with the bottom end of the sliding plate (24). An upper spring (42) is fixedly connected between the bottom end of the fixed frame (14) and the bottom end of the connecting plate (29).

6. A field surveying device for forestry surveys according to claim 4, characterized in that: The limiting rods (27) are all set with smooth arc surfaces on the side closest to each other, and the side wall of the moving plate (26) and the side wall of the cross groove (23) are both fixedly connected with a lower spring (32).

7. A field surveying device for forestry investigation according to claim 1, characterized in that: The T-shaped plate (8) has a pair of T-shaped grooves (33) at the top rear side, and an installation groove (34) at the top of the T-shaped grooves (33). A T-shaped block (35) is inserted into the inner side of the T-shaped grooves (33). A rear plate (36) is fixedly connected between the rear sides of the T-shaped blocks (35). A protective bag (37) is hinged to the top of the rear plate (36). Sub-Velvet strips (40) are fixedly connected to both sides of the bottom front side of the protective bag (37). A female Velcro strip (41) is fixedly connected to the front side of the protective bag (37) above the sub-Velvet strips (40).

8. A field surveying device for forestry surveys according to claim 1, characterized in that: Both sides of the top of the fixed plate (10) are fixedly connected with through grooves (38), and the inside of the through grooves (38) is fixedly connected with a fixed rod (39).

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