Non-contact tree diameter intelligent measuring device based on line laser

Abstract

The application relates to the technical field of laser measuring instruments, and discloses a non-contact intelligent tree breast diameter measuring device based on a line laser, which solves the problems existing in the prior art. The device comprises a support, two mounting plates are symmetrically and fixedly connected to the upper end of the support, a measuring platform is rotationally connected to the mutually-close side walls of the two mounting plates, a scale is arranged at the upper end of the measuring platform, a control mechanism and a measuring mechanism for measuring the tree breast diameter are further arranged, the control mechanism comprises a sealing box fixedly connected to the upper end of the measuring platform, two sealing blocks are symmetrically and fixedly connected to the inner wall of the sealing box, a horizontal sensing control mechanism composed of a mercury liquid level and an arc-shaped conductive sheet is arranged, and an electric push rod is arranged in cooperation, the device can automatically adjust the measuring platform to a horizontal state on a bumpy ground, the process is completely autonomous, manual intervention is not needed, the measuring datum surface inclination error caused by uneven terrain is fundamentally eliminated, and the reliability of the measuring data is ensured.

Description

Technical Field

[0001] This invention relates to the field of laser measuring instrument technology, and in particular to a non-contact intelligent measuring device for tree diameter at breast height based on line laser. Background Technology

[0002] Tree diameter at breast height (DBH) is a key measurement parameter in forestry resource surveys, ecological environment monitoring, and garden management. Traditionally, it is mostly measured by contact measurement using DBH rulers or calipers. This method is not only inefficient but also prone to damaging the bark due to human operation or improper tool clamping force. With technological advancements, some electronic measuring devices have emerged, but they usually have significant limitations: for example, in uneven forest terrain, the equipment is difficult to keep level, resulting in a skewed measurement reference plane and affecting data accuracy; for trees with irregular trunk cross-sections or tilted growth, conventional equipment cannot adaptively adjust, leading to large measurement errors. Summary of the Invention

[0003] The technical problem to be solved by this invention is that existing measuring devices cannot adaptively adjust to different bottom surface conditions and tree growth conditions. To address this, we propose a non-contact intelligent tree diameter measurement device based on line laser.

[0004] To achieve the above objectives, this application adopts the following technical solution: a non-contact intelligent tree diameter at breast height (DBH) measuring device based on line laser, including a support frame, two mounting plates symmetrically fixedly connected to the upper end of the support frame, a measuring platform rotatably connected to the side walls of the two mounting plates that are close to each other, a scale being provided on the upper end of the measuring platform, and also including a control mechanism and a measuring mechanism for measuring the DBH of trees;

[0005] The control mechanism includes a sealed box fixedly connected to the upper end of the measuring platform. Two sealing blocks are symmetrically and fixedly connected to the inner wall of the sealed box, and the space between the two sealing blocks is filled with mercury. An adjusting cylinder is rotatably connected to the inner wall of the sealing block, and two arc-shaped conductive plates are fixedly embedded in the side wall of the adjusting cylinder.

[0006] The measuring mechanism includes two sliders symmetrically slidably connected to the inner wall of the measuring platform. Two mounting seats are symmetrically slidably connected to the side wall of the measuring platform. A laser emitter is fixedly connected to the upper end of each of the two mounting seats. A mounting frame is hinged to the side wall of the mounting seat. A photoelectric sensor corresponding to the laser emitter is fixedly connected to the upper end of the mounting frame.

[0007] Preferably, the measuring mechanism further includes a bidirectional lead screw rotatably connected to the inner wall of the measuring platform. The side wall of the bidirectional lead screw is threadedly connected to both sliders. A servo motor is fixedly connected to the side wall of the measuring platform. The output end of the servo motor passes through the side wall of the measuring platform and is fixedly connected to the bidirectional lead screw. A limit component is provided on the slider.

[0008] Preferably, the limiting component includes a groove formed on the upper end of the slider, a magnetic rod slidably connected to the inner wall of the groove, a limiting hole that cooperates with the magnetic rod at the lower end of the mounting base, an electromagnet fixedly connected to the bottom of the groove, a spring fixedly connected between the bottom of the groove and the magnetic rod, and the electromagnet and the photoelectric sensor connected through a PLC control circuit.

[0009] Preferably, the sealing block has an arc-shaped cavity, a magnetic sliding plug is fixedly connected to the side wall of the adjusting cylinder, a spring is fixedly connected between the magnetic sliding plug and the inner wall of the arc-shaped cavity, the other end of the connecting pipe is connected to the outside, and a solenoid valve is installed on the inner wall of the connecting pipe.

[0010] Preferably, the mounting frame is equipped with an error correction mechanism, which includes two T-slots symmetrically formed on the inner wall of the mounting frame. The inner walls of the two T-slots are slidably connected to a mounting frame. The inner wall of the mounting frame is rotatably connected to a rotating rod. The side wall of the rotating rod is fixedly connected to a stop plate. The inner walls of the two T-slots are each fixedly connected to a spring three. The other end of the spring three is fixedly connected to the mounting frame.

[0011] Preferably, the error correction mechanism further includes an instantaneous switch fixedly connected to the inner wall of the mounting frame, an alarm fixedly connected to the upper end of the sealed box, the instantaneous switch and the alarm being connected by a wire, and the instantaneous switch and the servo motor being connected by a PLC control circuit.

[0012] Preferably, the bracket is equipped with a horizontal adjustment mechanism, which includes four fixed plates fixedly connected to the upper end of the bracket. The sidewalls of two fixed plates located on the same side are rotatably connected to an electric push rod by a pin. The movable end of the electric push rod is rotatably connected to the lower end of the measuring platform. The arc-shaped conductive sheet, the electric push rod, and the power supply are connected by a wire.

[0013] Preferably, a stabilizing component is installed inside the arc-shaped cavity. The stabilizing component includes an electromagnet fixedly connected to the inner wall of the arc-shaped cavity. The electromagnet, servo motor, diode, and power supply are connected by wires.

[0014] Preferably, the mounting frame is equipped with an adaptive adjustment mechanism, which includes an arc-shaped cavity two formed within the mounting frame. The inner wall of the arc-shaped cavity two is slidably connected to an arc-shaped conductive block. The inner wall of the arc-shaped cavity two is fixedly connected to a connecting pipe two. The arc-shaped cavity two is connected to an arc-shaped cavity one through a connecting pipe three. A torsion spring is sleeved on the side wall of the rotating rod. The two ends of the torsion spring are fixedly connected to the inner wall of the mounting frame and the side wall of the abutment plate, respectively. Two arc-shaped conductive plates are fixedly embedded in the inner wall of the arc-shaped cavity two.

[0015] Preferably, the adaptive adjustment mechanism further includes two arc-shaped conductive plates symmetrically fixedly embedded in the inner wall of the arc-shaped cavity two, and electromagnetic reversing valves are installed on the inner walls of both the connecting pipe two and the connecting pipe three. The two arc-shaped conductive plates are respectively connected to the electromagnetic reversing valves through wires.

[0016] The technical effects and advantages of this invention are as follows:

[0017] In this invention, a horizontal sensing control mechanism composed of mercury level and arc-shaped conductive sheet, in conjunction with an electric push rod, enables the device to quickly and automatically adjust the measuring platform to a horizontal state on uneven ground. This process is completely autonomous and requires no manual intervention, fundamentally eliminating the tilt error of the measuring reference surface caused by uneven terrain and ensuring the reliability of the measurement data.

[0018] In this invention, two independently movable and controllable laser ranging units are used. During measurement, the two units move towards each other. Once the laser is blocked by the tree trunk, the corresponding unit stops immediately. This design enables the device to accurately capture the widest part of the irregular tree trunk cross section, breaking through the limitations of traditional methods on regular circular tree trunks. It has a wider range of applications and more accurate measurement results.

[0019] In this invention, for trees growing at an angle, the device triggers an adaptive adjustment mechanism by the contact between the abutment plate and the trunk. This mechanism can intelligently drive the measurement platform to tilt at a corresponding angle, so that it eventually remains parallel to the diameter at breast height (DBH) cross-section of the tilted trunk. It solves the industry problem of accurately measuring the DBH of tilted trees, realizes true cross-sectional measurement, and greatly improves the scientific nature and accuracy of the measurement. Attached Figure Description

[0020] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0021] Figure 1 This is a three-dimensional structural diagram of the non-contact intelligent tree diameter-at-breast measurement device based on line laser proposed in this invention.

[0022] Figure 2 for Figure 1 Rear view diagram of the mid-section structure;

[0023] Figure 3 for Figure 1 A cross-sectional view of the measurement platform.

[0024] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A;

[0025] Figure 5 for Figure 3Enlarged schematic diagram of the structure at point B;

[0026] Figure 6 for Figure 1 A cross-sectional view of the central sealing box;

[0027] Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point C;

[0028] Figure 8 for Figure 1 A three-dimensional structural diagram of the mounting bracket;

[0029] Figure 9 for Figure 8 Top view of the structure;

[0030] Figure 10 for Figure 9 A cross-sectional view of the mounting frames on both sides.

[0031] Legend: 1. Bracket; 2. Mounting plate; 3. Measuring platform; 4. Sealing box; 5. Sealing block; 6. Adjusting cylinder; 7. Arc-shaped conductive sheet; 8. Slider; 801. Mounting base; 9. Laser emitter; 10. Mounting bracket; 11. Photoelectric sensor; 12. Bidirectional lead screw; 13. Servo motor; 14. Slide groove; 15. Magnetic rod; 16. Limiting hole; 17. Electromagnet one; 18. Spring one; 19. Arc-shaped cavity 1. Magnetic slider; 20. Spring II; 22. Electromagnet II; 23. Connecting pipe I; 24. T-slot; 25. Mounting frame; 26. Rotating rod; 27. Support plate; 28. Spring III; 29. ​​Instantaneous switch; 30. Alarm; 31. Fixing plate; 32. Electric push rod; 33. Arc-shaped cavity II; 34. Arc-shaped conductive block; 35. Connecting pipe II; 36. Connecting pipe III; 37. Arc-shaped conductive plate; 38. Torsion spring. Detailed Implementation

[0032] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0033] Example 1: Refer to Figure 1-8 As shown, the present invention provides a technical solution: a non-contact intelligent tree diameter at breast height (DBH) measuring device based on line laser, including a support 1, two mounting plates 2 are symmetrically fixedly connected to the upper end of the support 1, the side walls of the two mounting plates 2 are rotatably connected to a measuring platform 3, the upper end of the measuring platform 3 is provided with a scale, and also includes a control mechanism and a measuring mechanism for measuring the DBH of trees.

[0034] The control mechanism includes a sealing box 4 fixedly connected to the upper end of the measuring platform 3. Two sealing blocks 5 are symmetrically and fixedly connected to the inner wall of the sealing box 4, and the space between the two sealing blocks 5 is filled with mercury. An adjusting cylinder 6 is rotatably connected to the inner wall of the sealing block 5, and two arc-shaped conductive plates 7 are fixedly embedded in the side wall of the adjusting cylinder 6.

[0035] The measuring mechanism includes two sliders 8 symmetrically slidably connected to the inner wall of the measuring platform 3. Two mounting seats 801 are symmetrically slidably connected to the side wall of the measuring platform 3. A laser emitter 9 is fixedly connected to the upper end of each mounting seat 801. A mounting frame 10 is hinged to the side wall of the mounting seat 801. A photoelectric sensor 11 corresponding to the laser emitter 9 is fixedly connected to the upper end of the mounting frame 10.

[0036] The measuring mechanism also includes a bidirectional lead screw 12 that is rotatably connected to the inner wall of the measuring platform 3. The side wall of the bidirectional lead screw 12 is threadedly connected to the two sliders 8. A servo motor 13 is fixedly connected to the side wall of the measuring platform 3. The output end of the servo motor 13 passes through the side wall of the measuring platform 3 and is fixedly connected to the bidirectional lead screw 12. A limit component is provided on the slider 8.

[0037] The limiting component includes a slide groove 14 on the upper end of the slider 8, a magnetic rod 15 slidably connected to the inner wall of the slide groove 14, a limiting hole 16 that cooperates with the magnetic rod 15 on the lower end of the mounting base 801, an electromagnet 17 fixedly connected to the bottom of the slide groove 14, a spring 18 fixedly connected between the bottom of the slide groove 14 and the magnetic rod 15, and the electromagnet 17 and the photoelectric sensor 11 are connected by a PLC control circuit.

[0038] An arc-shaped cavity 19 is provided inside the sealing block 5. A magnetic sliding plug 20 is fixedly connected to the side wall of the adjusting cylinder 6. A spring 21 is fixedly connected between the magnetic sliding plug 20 and the inner wall of the arc-shaped cavity 19. A connecting pipe 23 is fixedly connected to the inner wall of the arc-shaped cavity 19. The other end of the connecting pipe 23 is connected to the outside, and a solenoid valve is installed on the inner wall of the connecting pipe 23.

[0039] The mounting bracket 10 is equipped with an error correction mechanism, which includes two T-slots 24 symmetrically formed on the inner wall of the mounting bracket 10. The inner walls of the two T-slots 24 are slidably connected to a mounting frame 25. The inner wall of the mounting frame 25 is rotatably connected to a rotating rod 26. The side wall of the rotating rod 26 is fixedly connected to a stop plate 27. The inner walls of the two T-slots 24 are both fixedly connected to a spring 28. The other end of the spring 28 is fixedly connected to the mounting frame 25.

[0040] The error correction mechanism also includes an instantaneous switch 29 fixedly connected to the inner wall of the mounting bracket 10, an alarm 30 fixedly connected to the upper end of the sealed box 4, the instantaneous switch 29 and the alarm 30 are connected by a wire, and the instantaneous switch 29 and the servo motor 13 are connected by a PLC control circuit.

[0041] A horizontal adjustment mechanism is installed on the bracket 1. The horizontal adjustment mechanism includes four fixed plates 31 fixedly connected to the upper end of the bracket 1. Two fixed plates 31 located on the same side are connected to an electric push rod 32 by a pin. The movable end of the electric push rod 32 is rotatably connected to the lower end of the measuring platform 3. The arc-shaped conductive sheet 7, the electric push rod 32 and the power supply are connected by a wire.

[0042] It should be noted that the two arc-shaped conductive plates 7 on both sides control the operation of the electric push rods 32 on both sides respectively. When the two arc-shaped conductive plates 7 on one side are submerged in mercury and energized, the electric push rod 32 on the corresponding side will be energized and extend, while the electric push rod 32 on the other side will be energized and shorten.

[0043] A stabilizing component is installed inside the arc-shaped cavity 19. The stabilizing component includes an electromagnet 22 fixedly connected to the inner wall of the arc-shaped cavity 19. The electromagnet 22, the servo motor 13, the diode, and the power supply are connected by wires. A connecting pipe 23 is fixedly connected to the inner wall of the arc-shaped cavity 19, and the other end of the connecting pipe 23 is connected to the outside.

[0044] Working principle: Most trees grow vertically upwards. Therefore, during measurement, support 1 is placed on the ground. If the ground is level, the measuring platform 3 will be level with the tree's diameter at breast height (DBH) cross-section, allowing for direct measurement. If the ground is uneven, support 1 will tilt. In this case, the measuring platform 3 will tilt in the direction support 1 tilts. When the measuring platform 3 tilts to the left (see attached diagram),... Figure 3 and 4 (Example) In this case, the mercury in the sealed box 4 will flow to the left, causing both arc-shaped conductive plates 7 on the left to be completely submerged by the mercury, thus completing the circuit. At this time, the electric push rod 32 on the left is energized and extends, while the electric push rod 32 on the right is energized and simultaneously shortens. As a result, the measuring platform 3 will slowly rotate clockwise and gradually approach horizontal. At this time, the mercury in the sealed box 4 will also flow to the right synchronously until the mercury is level. Then the circuit will be broken, and the measuring platform 3 will stop rotating and become horizontal. Therefore, the entire device can automatically adjust to be horizontal for any uneven ground, thus ensuring measurement accuracy.

[0045] Next, the servo motor 13 can be started, and the laser emitter 9 can be started simultaneously. The laser emitter 9 will emit linear laser light, which will be received by the corresponding photoelectric sensor 11. The servo motor 13 will drive the bidirectional lead screw 12 to rotate, and then the two sliders 8 will move closer to each other. The sliders 8 will drive the mounting base 801 to move, which in turn will drive the mounting bracket 10 to move, and drive the photoelectric sensor 11 to move. At this time, the two linear laser beams will move closer to each other until the linear laser is blocked by the tree trunk. After the photoelectric sensor 11 can no longer receive the laser signal, it will immediately control the corresponding electromagnet through the control circuit. When energized, 17 generates a magnetic force that draws the magnetic rod 15 into the slide groove 14. Consequently, there is no limit between the slider 8 and the mounting base 801, causing the mounting base 801 to stop moving. This, in turn, stops the corresponding laser emitter 9 and photoelectric sensor 11. Once both mounting bases 801 have stopped, the distance between them can be read from the scale on the measuring platform 3, which is the diameter at breast height (DBH) of the tree. This measurement method is simple and convenient, and because the mounting bases 801 can be stopped independently, it is applicable to the measurement of trees with various irregular cross-sections, thus having a wider range of applications.

[0046] In addition, during the measurement process, the tree trunk will first contact the abutment plate 27. Therefore, the tree trunk will push the mounting frame 25 to move through the abutment plate 27. If the mounting frame 25 moves to the point where the momentary switch 29 is pressed, the alarm 30 will be activated and the servo motor 13 will immediately stop rotating. At this time, the photoelectric sensor 11 did not receive the laser signal emitted by the laser emitter 9 initially. Therefore, when the side of the tree trunk is already between the laser emitter 9 and the photoelectric sensor 11, the photoelectric sensor 11 cannot detect the disappearance of the laser signal and thus control the electromagnet 17 to be energized. At this time, the alarm 30 will sound to notify the staff to detect the fault. The staff can then repair the laser emitter 9 and the photoelectric sensor 11 to avoid the failure to detect the fault and result in the final data being incorrect.

[0047] During the measurement process, the servo motor 13 vibrates, causing the mercury inside the sealed box 4 to fluctuate. This fluctuating mercury may accidentally touch the two arc-shaped conductive plates 7 on both sides, thus connecting the circuit and causing the electric push rod 32 to move, thereby leveling the measuring platform 3 again. Since this leveling is accidental, the measuring platform 3 will tilt. Therefore, when the servo motor 13 is supplied with positive current, driving the bidirectional lead screw 12 to rotate in the forward direction, causing the two sliders 8 to move closer to each other, the electromagnet 22 will also be energized, generating a magnetic attraction force that drives the magnetic slider 20 to rotate, which in turn drives the adjusting cylinder 6 to rotate (the two adjusting cylinders 6 rotate in opposite directions, one in the forward direction). The clockwise and counterclockwise rotations prevent the upper arc-shaped conductive plate 7 from contacting the mercury again, causing the two arc-shaped conductive plates 7 to rotate to the other side of the sealing block 5. Therefore, no matter how the mercury fluctuates, it will not contact the arc-shaped conductive plate 7, thus ensuring that the measuring platform 3 will not be leveled again during the measurement process. After the measurement is completed, the servo motor 13 applies a reverse current to drive the slider 8 to reset. At this time, due to the current blocking effect of the diode, the electromagnet 22 will be de-energized, the magnetic attraction will disappear, and the magnetic slider 20 will be reset under the action of the spring 21, thereby causing the adjusting cylinder 6 to reverse and reset, and the arc-shaped conductive plate 7 to reset, preparing for the initial leveling of the next measurement.

[0048] Example 2: Refer to Figure 9-10 As shown in this embodiment: the non-contact intelligent tree diameter measurement device based on line laser includes an adaptive adjustment mechanism. The adaptive adjustment mechanism includes an arc-shaped cavity 33 opened in the mounting frame 25. The inner wall of the arc-shaped cavity 33 is sealed and slidably connected to an arc-shaped conductive block 34. The inner wall of the arc-shaped cavity 33 is fixedly connected to a connecting pipe 35. The arc-shaped cavity 33 is connected to the arc-shaped cavity 19 through a connecting pipe 36. A torsion spring 38 is sleeved on the side wall of the rotating rod 26. The two ends of the torsion spring 38 are fixedly connected to the inner wall of the mounting frame 25 and the side wall of the abutment plate 27, respectively. Two arc-shaped conductive plates 37 are fixedly embedded in the inner wall of the arc-shaped cavity 33.

[0049] The adaptive adjustment mechanism also includes two arc-shaped conductive plates 37 symmetrically fixedly embedded in the inner wall of the arc-shaped cavity 33. Electromagnetic reversing valves are installed on the inner walls of the connecting pipe 35 and the connecting pipe 36. The two arc-shaped conductive plates 37 are respectively connected to the electromagnetic reversing valves through wires.

[0050] It should be noted that the two arc-shaped conductive plates 37 are respectively connected to two different coils in the electromagnetic reversing valve. Therefore, when the different arc-shaped conductive plates 37 are energized, the different coils in the electromagnetic reversing valve are energized, thereby controlling the flow direction. When the electromagnetic reversing valve is not energized, it remains closed. This is existing technology and will not be elaborated here.

[0051] Working principle: When measuring a tree that has grown crookedly, simply place the support 1 stably, then start the servo motor 13 to move the sliders 8 closer together, which in turn moves the two mounting bases 801 closer together, causing the laser emitter 9 and photoelectric sensor 11 to move. When the abutment 27 moves to abut against the side wall of the tree trunk, the abutment 27 will rotate, and finally the abutment 27 will be in complete contact with the side wall of the tree trunk. When the abutment 27 rotates, it will drive the rotating rod 26 to rotate. If the abutment 27 rotates clockwise (refer to...), the rotation will cause the rotating rod 26 to rotate. Figure 10 As shown), this will cause the arc-shaped conductive block 34 to rotate instantaneously. At this time, the arc-shaped conductive block 34 contacts the arc-shaped conductive plate 37 on the right. Then, the electromagnetic reversing valve in the second connecting pipe 35 on the right only allows external gas to enter the second arc-shaped cavity 33, while the electromagnetic reversing valve in the third connecting pipe 36 only allows air in the second arc-shaped cavity 33 to enter the corresponding arc-shaped cavity 19. The electromagnetic reversing valve in the second connecting pipe 35 on the left only allows air in the second arc-shaped cavity 33 to be discharged, and the electromagnetic reversing valve in the third connecting pipe 36 only allows air in the corresponding arc-shaped cavity 19 to enter the second arc-shaped cavity 33 (if the abutment plate 27 rotates counterclockwise, causing the arc-shaped conductive block 34 to contact the arc-shaped conductive plate 37 on the right, the situation will be reversed). At this time, the arc-shaped conductive block The 34-seal sliding mechanism forces air from one side of the arc-shaped cavity 33 into the corresponding arc-shaped cavity 19, while air from the other side of the arc-shaped cavity 19 is drawn into the corresponding arc-shaped cavity 33. This causes the two adjusting cylinders 6 to rotate in the same direction. If the trunk tilts to the right, the left adjusting cylinder 6 will rotate, causing the two arc-shaped conductive plates 7 to contact the mercury. Meanwhile, the two arc-shaped conductive plates 7 on the other side will rotate and rise synchronously. At this time, the left electric push rod 32 extends, and the right electric push rod 32 shortens, causing the measuring platform 3 to tilt synchronously, maintaining the same tilt angle as the trunk. Consequently, the measuring platform 3 will remain horizontal with the cross-section of the trunk's diameter at breast height, ensuring accurate measurement data. Therefore, it can be applied to trees with different tilt angles.

[0052] After the measurement is completed, the solenoid valve in the connecting pipe 23 can be energized to cause the magnetic sliding plug 20 to drive the regulating cylinder 6 to reset.

[0053] It should be noted that the spring constant of torsion spring 38 is much smaller than that of spring 28. Spring 28 will only begin to be compressed when torsion spring 38 is torsionally twisted to its limit.

[0054] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A non-contact intelligent tree diameter-at-breast-length measurement device based on line laser, characterized in that, include: The support has two mounting plates symmetrically fixedly connected to its upper end. The side walls of the two mounting plates, which are close to each other, are rotatably connected to a measuring platform. The upper end of the measuring platform is provided with a scale. The measuring device also includes a control mechanism and a measuring mechanism for measuring the diameter at breast height of trees. The control mechanism includes a sealed box fixedly connected to the upper end of the measuring platform. Two sealing blocks are symmetrically and fixedly connected to the inner wall of the sealed box, and the space between the two sealing blocks is filled with mercury. An adjusting cylinder is rotatably connected to the inner wall of each sealing block, and two arc-shaped conductive sheets are fixedly embedded in the side wall of each adjusting cylinder. The support is equipped with a horizontal adjustment mechanism, which includes four fixed plates fixedly connected to the upper end of the support. Two fixed plates on the same side, with their sidewalls close to each other, are rotatably connected to an electric push rod via a pin. The movable end of the electric push rod is rotatably connected to the lower end of the measuring platform. The arc-shaped conductive plate, the electric push rod, and the power supply are connected by a wire. Two arc-shaped conductive plates on each side control the operation of the electric push rods on both sides. When the two arc-shaped conductive plates on one side are submerged in mercury and energized, the electric push rod on the corresponding side will extend, while the electric push rod on the other side will shorten until the mercury is level, at which point the circuit is broken. The measuring mechanism includes two sliders symmetrically slidably connected to the inner wall of the measuring platform. Two mounting seats are symmetrically slidably connected to the side wall of the measuring platform. A laser emitter is fixedly connected to the upper end of each mounting seat. A mounting frame is hinged to the side wall of each mounting seat, and a photoelectric sensor corresponding to the laser emitter is fixedly connected to the upper end of the mounting frame. The slider is provided with a limiting component, which includes a groove opened at the upper end of the slider, a magnetic rod slidably connected to the inner wall of the groove, a limiting hole that cooperates with the magnetic rod at the lower end of the mounting base, an electromagnet fixedly connected to the bottom of the groove, a spring fixedly connected between the bottom of the groove and the magnetic rod, and the electromagnet and the photoelectric sensor are connected through a PLC control circuit. An arc-shaped cavity is formed inside the sealing block. A magnetic sliding plug is fixedly connected to the side wall of the adjusting cylinder. A spring is fixedly connected between the magnetic sliding plug and the inner wall of the arc-shaped cavity. A connecting pipe is fixedly connected to the inner wall of the arc-shaped cavity. The other end of the connecting pipe is connected to the outside. A solenoid valve is installed on the inner wall of the connecting pipe. The mounting frame is equipped with an error correction mechanism, which includes two T-slots symmetrically formed on the inner wall of the mounting frame. The inner walls of the two T-slots are slidably connected to a mounting frame. The inner wall of the mounting frame is rotatably connected to a rotating rod. A stop plate is fixedly connected to the side wall of the rotating rod. A spring is fixedly connected to the inner walls of both T-slots. The other end of the spring is fixedly connected to the mounting frame. An adaptive adjustment mechanism is installed on the mounting frame. The adaptive adjustment mechanism includes an arc-shaped cavity two opened within the mounting frame. An arc-shaped conductive block is slidably connected to the inner wall of the arc-shaped cavity two. A connecting pipe two is fixedly connected to the inner wall of the arc-shaped cavity two. The arc-shaped cavity two is connected to the arc-shaped cavity one through a connecting pipe three. A torsion spring is sleeved on the side wall of the rotating rod. The two ends of the torsion spring are fixedly connected to the inner wall of the mounting frame and the side wall of the abutment plate, respectively. The adaptive adjustment mechanism also includes two arc-shaped conductive plates symmetrically fixedly embedded in the inner wall of the arc-shaped cavity two. The stiffness coefficient of the torsion spring is much smaller than that of the spring three. Electromagnetic reversing valves are installed on the inner walls of both the connecting pipe two and the connecting pipe three. The two arc-shaped conductive plates are connected to the electromagnetic reversing valves through wires. The adaptive adjustment mechanism is triggered by the contact between the abutment plate and the tree trunk. This mechanism can intelligently drive the measuring platform to tilt at a corresponding angle, so that it ultimately remains parallel to the diameter-at-breast cross section of the tilted tree trunk.

2. The non-contact intelligent tree diameter measurement device based on line laser as described in claim 1, characterized in that: The measuring mechanism also includes a bidirectional lead screw rotatably connected to the inner wall of the measuring platform. The side wall of the bidirectional lead screw is threadedly connected to both sliders. A servo motor is fixedly connected to the side wall of the measuring platform. The output end of the servo motor passes through the side wall of the measuring platform and is fixedly connected to the bidirectional lead screw.

3. The non-contact intelligent tree diameter measurement device based on line laser as described in claim 2, characterized in that: The error correction mechanism also includes an instantaneous switch fixedly connected to the inner wall of the mounting frame. An alarm is fixedly connected to the upper end of the sealed box. The instantaneous switch and the alarm are connected by a wire, and the instantaneous switch and the servo motor are connected by a PLC control circuit.

4. The non-contact intelligent tree diameter measurement device based on line laser as described in claim 3, characterized in that: A stabilizing component is installed inside the arc-shaped cavity. The stabilizing component includes an electromagnet that is fixedly connected to the inner wall of the arc-shaped cavity. The electromagnet, servo motor, diode, and power supply are connected by wires.

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