A plant stem diameter measuring device and use method

Abstract

The present invention discloses a plant stem thickness measuring device and a method of using the device, and relates to the technical field of plant stem thickness measuring devices. The device comprises a rangefinder body, a support arm, and an arc-shaped rotating plate. The inner walls of the two arc-shaped rotating plates are both circumferentially equidistantly equipped with a plurality of laser transmitters. A display screen is installed at the top of the rangefinder body. Laser receivers are installed inside the two arc-shaped rotating plates. The support arm is provided with a rotating mechanism for driving the two arc-shaped rotating plates to rotate in opposite directions respectively. The end of the support arm close to the rangefinder body is provided with a folding mechanism for folding and storing the support arm or unfolding and supporting the support arm. The present invention can conveniently rotate and open and close the two arc-shaped rotating plates through the rotating mechanism, which is conducive to directly sleeve the outer wall at the lowest position or the highest position of the plant stem according to the needs, so as to conveniently measure the surface of the plant stem, thereby further improving the efficiency of measuring the surface of the plant stem.

Description

Technical Field

[0001] The invention relates to the technical field of plant stem diameter measuring devices, and in particular to a plant stem diameter measuring device and a use method thereof. Background Art

[0002] A plant is a growing plant body including roots, stems, leaves and other parts. During the growth process of the plant, the changes in the thickness of the plant stem can better reflect the good condition of the plant during the growth and development process. However, this change is usually small and difficult to observe with the naked eye in a short period of time. Therefore, it is necessary to use a measuring device to measure the plant stem at different times.

[0003] The main tool for measuring the thickness of plant stems is a vernier caliper. However, during the use of the vernier caliper, due to the irregularity of the surface of the plant stems (such as the square stems of broad bean plants, the non-circular stems of soybean plants, etc.), and the need for the vernier caliper to be in contact with the plant stems during measurement, excessive force will cause the vernier caliper to squeeze the surface of the plant stems, resulting in different force applied by the measurer during measurement, which will lead to large errors in the measured data. Based on this, a plant stem thickness measuring device and a method of use are now provided to eliminate the disadvantages of the existing devices. Summary of the invention

[0004] The object of the present invention is to provide a plant stem diameter measuring device and a use method thereof to solve the problems in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A plant stem diameter measuring device comprises a rangefinder body, a support arm is arranged at one end of the rangefinder body, two arc-shaped rotating plates are symmetrically arranged at one end of the support arm away from the rangefinder body, the two arc-shaped rotating plates are rotatably connected to the support arm through a rotating shaft, a plurality of laser transmitters are equidistantly installed on the inner walls of the two arc-shaped rotating plates in the circumferential direction, a display screen is arranged at the top of the rangefinder body, laser receivers are arranged inside the two arc-shaped rotating plates, and a rotating mechanism is arranged on the support arm for driving the two arc-shaped rotating plates to rotate in opposite directions respectively;

[0007] The rotating mechanism comprises:

[0008] Two fixed sleeves symmetrically fixedly connected to the outer wall of the support arm, the two fixed sleeves are respectively located at the upper and lower ends of the support arm away from the end of the rangefinder body;

[0009] A folding mechanism for folding and storing the support arm or unfolding and supporting the support arm is arranged at one end of the support arm close to the rangefinder body.

[0010] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0011] In an optional solution: the rotating mechanism further includes:

[0012] A rotating assembly is arranged inside the fixed sleeve frame, and the rotating assembly is used to drive the two arc-shaped rotating plates to rotate respectively;

[0013] The rotating assembly comprises:

[0014] Two gears are symmetrically arranged inside the fixed sleeve, the two gears are rotatably connected to the fixed sleeve through a rotating shaft, the two gears are respectively fixedly connected to two arc-shaped rotating plates through a connecting shaft, and the support arm is rotatably connected to the connecting shaft through a bearing;

[0015] The fixed sleeve frame is provided with a moving assembly, and the moving assembly is used to drive the two gears to rotate in opposite directions.

[0016] In an optional solution: the mobile component includes:

[0017] A movable push block is arranged at one end of the fixed sleeve far from the support arm, the movable push block penetrates into the interior of the fixed sleeve, the movable push block is slidably connected to the fixed sleeve, and one end of the movable push block close to the support arm is fixedly connected with a rack, the rack is located inside the fixed sleeve, and the rack is respectively meshed with two gears;

[0018] A limiting component is arranged at one end of the rack, and the limiting component is used for extruding and limiting the rack.

[0019] In an optional solution: the limit assembly includes:

[0020] A connecting push block is arranged at one end of the rack, the outer wall of the connecting push block is slidably sleeved with a movable sliding frame, the movable sliding frame is fixedly connected to the rack, and the movable sliding frame is slidably connected to the support arm and the fixed sleeve frame;

[0021] A guide assembly is arranged on the outer side of the connecting push block, and the guide assembly is used for squeezing the sliding frame to move.

[0022] In an optional solution: the guide assembly includes:

[0023] Two guide pressing blocks are symmetrically fixedly connected to the outer wall of the connecting push block, the two guide pressing blocks are respectively located at the upper and lower ends of the connecting push block, the two guide pressing blocks are both penetrated into the interior of the movable slide frame, and the movable slide frame and the two guide pressing blocks are both provided with guide inclined grooves for the guide pressing blocks to slide at the connection positions;

[0024] A pressing component is arranged on one side of the connecting push block, and the pressing component is used for pressing and fixing the connecting push block.

[0025] In an optional solution: the extrusion assembly includes:

[0026] A fixed guide plate is arranged on one side of the connecting push block, the fixed guide plate is fixedly connected to the fixed sleeve frame, the outer wall of the fixed guide plate is sleeved with a limiting push plate, the limiting push plate passes through the outside of one end of the fixed sleeve frame, and the limiting push plate is slidably connected to the fixed sleeve frame and the fixed guide plate.

[0027] In an optional solution: the folding mechanism includes:

[0028] A folding assembly is arranged at one end of the support arm close to the rangefinder body, and the folding assembly is used to fold the rangefinder body and the support arm;

[0029] The folding assembly comprises:

[0030] A connecting rotating cylinder is rotatably connected to one end of the support arm close to the rangefinder body through a rotating shaft, and one end of the connecting rotating cylinder away from the support arm is rotatably connected to a fixing frame through a rotating shaft, and the fixing frame is fixedly connected to the rangefinder body;

[0031] A support assembly is arranged on the outer side of the support arm, and the support assembly is used for horizontally supporting the support arm, the connecting drum and the fixing frame.

[0032] In an optional solution: the support assembly includes:

[0033] Two fixed blocks are symmetrically fixedly connected to the outer wall of the support arm, and one end of the two fixed blocks close to the rangefinder body is fixedly connected to a limit rod, and the outer wall of the limit rod is slidably sleeved with a support sleeve frame, and the support sleeve frame is located on the outside of the connecting drum, and the support sleeve frame is in contact with the outer wall of one end of the rangefinder body. Two groups of balls are symmetrically arranged at the upper and lower ends of the inner wall of the support sleeve frame, and the two groups of balls are in contact with the outer walls of the support arm, the connecting drum, and the fixed frame, respectively. A group of balls is provided with a plurality of balls, and the plurality of balls are laterally equidistantly arranged inside the support sleeve frame;

[0034] The support sleeve is provided with a reset component, and the reset component is used to push the support sleeve to automatically reset.

[0035] In an optional solution: the reset component includes:

[0036] Two movable pressing grooves are symmetrically opened on the inner wall of the supporting sleeve frame, and the two movable pressing grooves are respectively located on the outside of the two limit rods. The outer walls of the two limit rods are both sleeved with springs, one end of the spring contacts the outer wall of the fixed block, and the other end of the spring contacts the inner wall of the movable pressing groove.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. The present invention can conveniently rotate and open and close the two arc-shaped rotating plates through the rotating mechanism, which is conducive to directly sleeve the outer wall at the lowest position or the highest position of the plant stem according to needs, so as to conveniently measure the surface of the plant stem, thereby further improving the efficiency of measuring the surface of the plant stem.

[0039] 2. The present invention effectively reduces the space occupied by the device when it is carried through the folding mechanism, and during the folding process, through the cooperation with the rotating mechanism, the two arc-shaped rotating plates can be automatically closed, thereby achieving the purpose of conveniently storing the rangefinder body and carrying it with you. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of the present invention.

[0041] Figure 2 It is a schematic diagram of the cross-sectional structure of the support frame of the present invention.

[0042] Figure 3 It is a schematic diagram of the connecting drum structure in one embodiment of the present invention.

[0043] Figure 4 It is a schematic diagram of the cross-sectional structure of a fixed sleeve frame in one embodiment of the present invention.

[0044] Figure 5 It is a schematic diagram of the internal structure of the support frame in one embodiment of the present invention.

[0045] Figure 6 In one embodiment of the present invention Figure 2 Schematic diagram of the local enlarged structure at A in the figure.

[0046] Figure 7 In one embodiment of the present invention Figure 3 Schematic diagram of the local enlarged structure at point B in the figure.

[0047] Notes on the accompanying drawings: 1. Rangefinder body; 201. Rack; 202. Fixed sleeve frame; 203. Moving push block; 204. Guide pressure block; 205. Guide inclined groove; 206. Moving slide frame; 207. Connecting push block; 208. Gear; 209. Limit push plate; 2010. Fixed guide plate; 301. Connecting drum; 302. Support sleeve frame; 303. Fixed block; 304. Spring; 305. Limit rod; 306. Fixed frame; 307. Moving pressure groove; 308. Ball; 4. Arc rotating plate; 5. Laser emitter; 6. Support arm; 7. Display screen. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] In one embodiment, Figure 1-Figure 7 As shown, a plant stem diameter measuring device comprises a rangefinder body 1, a support arm 6 is arranged at one end of the rangefinder body 1, two arc-shaped rotating plates 4 are symmetrically arranged at one end of the support arm 6 away from the rangefinder body 1, the two arc-shaped rotating plates 4 are rotatably connected to the support arm 6 through a rotating shaft, a plurality of laser emitters 5 are equidistantly installed on the inner walls of the two arc-shaped rotating plates 4 in the circumferential direction, a display screen 7 is installed at the top of the rangefinder body 1, laser receivers are installed inside the two arc-shaped rotating plates 4, a control terminal is installed inside the rangefinder body 1, the laser emitter 5, the display screen 7 and the laser receiver are electrically connected to the control terminal through a data line, and a rotating mechanism for driving the two arc-shaped rotating plates 4 to rotate in opposite directions is arranged on the support arm 6;

[0050] The rotating mechanism includes:

[0051] Two fixed sleeves 202 symmetrically fixedly connected to the outer wall of the support arm 6, the two fixed sleeves 202 are respectively located at the upper and lower ends of the support arm 6 away from the end of the rangefinder body 1;

[0052] One end of the support arm 6 close to the rangefinder body 1 is provided with a folding mechanism for folding and storing the support arm 6 or unfolding and supporting the support arm 6;

[0053] In this embodiment, when in use, the two arc-shaped rotating plates 4 can be driven to rotate respectively by the rotating mechanism, so that the two arc-shaped rotating plates 4 can be conveniently rotated and opened, and then the two arc-shaped rotating plates 4 are respectively moved to the outside of the plant stem to be measured, and then the above operation is reversed to conveniently restore the two arc-shaped rotating plates 4, and then the rangefinder body 1 is started to scan the surface of the plant stem through the laser transmitter 5 and the laser receiver, and at the same time, the arc-shaped rotating plates 4 can be raised and lowered along the outside of the plant stem by the user holding the rangefinder body 1, and at the same time, the measured data can be transmitted to the display screen 7 through the control terminal, and the data can be displayed in real time through the display screen 7, so that the surface of the plant stem can be conveniently measured;

[0054] When the measurement is completed, the two arc-shaped rotating plates 4 can be automatically closed by the folding mechanism, and then the arc-shaped rotating plates 4 can be rotated to the bottom of the rangefinder body 1 by the rotating shaft under the drive of the support arm 6, so that the space occupied by the device when carried can be effectively reduced by folding, so that the rangefinder body 1 can be conveniently stored and carried;

[0055] In one embodiment, Figure 1-Figure 7 As shown, the rotating mechanism also includes:

[0056] A rotating assembly is arranged inside the fixed sleeve frame 202, and the rotating assembly is used to drive the two arc-shaped rotating plates 4 to rotate respectively;

[0057] The rotating components include:

[0058] Two gears 208 are symmetrically arranged inside the fixed sleeve 202. The two gears 208 are rotatably connected to the fixed sleeve 202 through a rotating shaft. The two gears 208 are respectively fixedly connected to the two arc-shaped rotating plates 4 through a connecting shaft. The support arm 6 is rotatably connected to the connecting shaft through a bearing.

[0059] A moving assembly is provided on the fixed sleeve frame 202, and the moving assembly is used to drive the two gears 208 to rotate in opposite directions;

[0060] In one embodiment, Figure 2-Figure 7 As shown, the mobile components include:

[0061] A moving push block 203 is arranged at one end of the fixed sleeve 202 away from the support arm 6, and the moving push block 203 penetrates into the interior of the fixed sleeve 202. The moving push block 203 is slidably connected to the fixed sleeve 202. The end of the moving push block 203 close to the support arm 6 is fixedly connected with a rack 201, and the rack 201 is located inside the fixed sleeve 202. The rack 201 is meshed with two gears 208 respectively. Through the meshing connection between the two gears 208 and the rack 201, the rack 201 can drive the two gears 208 to rotate in the opposite direction during the movement process;

[0062] A limiting component is disposed at one end of the rack 201 , and the limiting component is used to perform extrusion limiting on the rack 201 .

[0063] In one embodiment, Figure 2-Figure 7 As shown, the limit assembly includes:

[0064] A connecting push block 207 is arranged at one end of the rack 201, and a movable sliding frame 206 is slidably sleeved on the outer wall of the connecting push block 207. The movable sliding frame 206 is fixedly connected to the rack 201, and the movable sliding frame 206 is slidably connected to the support arm 6 and the fixed sleeve frame 202;

[0065] A guide assembly is provided on the outer side of the connecting push block 207, and the guide assembly is used to squeeze and move the sliding frame 206 to move.

[0066] In one embodiment, Figure 2-Figure 7 As shown, the guide assembly includes:

[0067] Two guide pressing blocks 204 are symmetrically fixedly connected to the outer wall of the connecting push block 207. The two guide pressing blocks 204 are respectively located at the upper and lower ends of the connecting push block 207. The two guide pressing blocks 204 are both penetrated into the interior of the movable slide frame 206. The movable slide frame 206 and the two guide pressing blocks 204 are both provided with guide inclined grooves 205 for the guide pressing blocks 204 to slide at the connecting positions. Through the mutual cooperation between the two guide pressing blocks 204 and the guide inclined grooves 205, the movable slide frame 206 can drive the connecting push block 207 to move during the movement process.

[0068] A pressing component is provided on one side of the connecting push block 207, and the pressing component is used to press and fix the connecting push block 207;

[0069] In one embodiment, Figure 3-Figure 7 As shown, the extrusion assembly includes:

[0070] A fixed guide plate 2010 is arranged on one side of the connecting push block 207, and the fixed guide plate 2010 is fixedly connected to the fixed sleeve frame 202. The outer wall of the fixed guide plate 2010 is sleeved with a limit push plate 209, and the limit push plate 209 penetrates to the outside of one end of the fixed sleeve frame 202. The limit push plate 209 is slidably connected with the fixed sleeve frame 202 and the fixed guide plate 2010. The outer wall of one side of the connecting push block 207 is in a slope shape, and the limit push plate 209 and the sloped outer wall of the connecting push block 207 are in contact with each other. Through the sloped outer wall, the limit push plate 209 can be pressed by an external force, and the connecting push block 207 can be pushed to reset by pressing the end face of the connecting push block 207, and the connecting push block 207 is limited and fixed;

[0071] In one embodiment, Figure 1-Figure 4 As shown, the folding mechanism includes:

[0072] A folding assembly is arranged at one end of the support arm 6 close to the rangefinder body 1, and the folding assembly is used to fold the rangefinder body 1 and the support arm 6;

[0073] The folding components include:

[0074] The connecting drum 301 is rotatably connected to the end of the support arm 6 close to the rangefinder body 1 through a rotating shaft, and the end of the connecting drum 301 away from the support arm 6 is rotatably connected to the fixing frame 306 through a rotating shaft. The fixing frame 306 is fixedly connected to the rangefinder body 1. The connecting drum 301 can be rotatably connected to the support arm 6 and the fixing frame 306 respectively through the rotating shaft. Therefore, when the support arm 6 is turned over, the connecting drum 301 is driven by the support arm 6 to rotate;

[0075] A support assembly is provided on the outer side of the support arm 6, and the support assembly is used to horizontally support the support arm 6, the connecting drum 301, and the fixing frame 306;

[0076] In one embodiment, Figure 1-Figure 5 As shown, the support assembly includes:

[0077] Two fixing blocks 303 are symmetrically fixedly connected to the outer wall of the support arm 6. One end of the two fixing blocks 303 close to the rangefinder body 1 is fixedly connected to a limit rod 305. The outer wall of the limit rod 305 is slidably sleeved with a support sleeve 302. The support sleeve 302 is located on the outside of the connecting drum 301. The support sleeve 302 contacts the outer wall of one end of the rangefinder body 1. Two groups of balls 308 are symmetrically arranged on the upper and lower ends of the inner wall of the support sleeve 302. The two groups of balls 308 are respectively connected to the support arm 6, the connecting drum 301, and the fixed frame 30 6, a group of balls 308 is provided with a plurality of balls, and the plurality of balls 308 are arranged in a horizontally equidistant manner inside the support sleeve 302. The support sleeve 302 can provide limited support for the support arm 6, the connecting drum 301, and the fixing frame 306, effectively preventing the support arm 6, the connecting drum 301, and the fixing frame 306 from rotating during the measurement process. At the same time, the balls 308 can effectively reduce the friction between the support sleeve 302 and the outer walls of the support arm 6, the connecting drum 301, and the fixing frame 306 during the movement process;

[0078] The support sleeve 302 is provided with a reset component, which is used to push the support sleeve 302 to automatically reset;

[0079] In one embodiment, Figure 1-Figure 5 As shown, the reset component includes:

[0080] Two movable pressing grooves 307 are symmetrically arranged on the inner wall of the support sleeve 302, and the two movable pressing grooves 307 are respectively located on the outer sides of the two limit rods 305. The outer walls of the two limit rods 305 are sleeved with springs 304. One end of the spring 304 contacts the outer wall of the fixed block 303, and the other end of the spring 304 contacts the inner wall of the movable pressing groove 307. Through the mutual cooperation between the movable pressing groove 307 and the spring 304, when the support arm 6 rotates to one end of the rangefinder body 1, the support sleeve 302 is pushed to automatically contact the outer wall of the rangefinder body 1, so that the support sleeve 302 can automatically support the support arm 6, the connecting drum 301, and the fixed frame 306.

[0081] The above embodiment discloses a plant stem diameter measuring device, wherein it is particularly noted that: the connecting drum 301, the fixing frame 306, the arc-shaped rotating plate 4 and the supporting arm 6 are all provided with openings for the data line to pass through;

[0082] When in use, the moving push blocks 203 on the two fixed sleeve frames 202 are pushed to move synchronously. At this time, the rack 201, driven by the moving push block 203, drives the moving slide frame 206 to move synchronously inside the fixed sleeve frame 202. In this process, the moving slide frame 206 squeezes the outer wall of the guide pressing block 204 through the guide inclined groove 205. At the same time, the connecting push block 207 moves along the inner wall of the fixed sleeve frame 202 under the drive of the guide pressing block 204. At this time, the limit push plate 209 moves toward the outside of one end of the fixed sleeve frame 202 along the outer wall of the fixed guide plate 2010 under the extrusion of the inclined outer wall of the connecting push block 207. At the same time, the two gears 208, driven by the meshing of the rack 201, respectively drive the two arc-shaped rotating plates 4 to rotate through the connecting shaft, so as to facilitate the convenient rotation and opening of the two arc-shaped rotating plates 4.

[0083] Then, the two arc-shaped rotating plates 4 are respectively moved to the outside of the plant stem to be measured, and then the above operation is reversed to conveniently restore the two arc-shaped rotating plates 4. Then, the rangefinder body 1 is started to scan the surface of the plant stem through the laser transmitter 5 and the laser receiver. At the same time, the user can hold the rangefinder body 1 to make the arc-shaped rotating plates 4 rise and fall along the outside of the plant stem. At the same time, the measured data can be transmitted to the display screen 7 through the control terminal. At this time, the data can be displayed in real time through the display screen 7, so that the surface of the plant stem can be conveniently measured;

[0084] When the measurement is completed, the support sleeve 302 is pushed to slide along the outer wall of the connecting drum 301, the limiting rod 305, the fixing frame 306 and the supporting arm 6. In this process, the support sleeve 302 can effectively reduce the friction between the connecting drum 301, the fixing frame 306 and the outer wall of the supporting arm 6 through a plurality of balls 308. At the same time, the support sleeve 302 can squeeze the spring 304 to contract during the movement through the moving pressing groove 307. When the support sleeve 302 contacts the outer wall of the limiting push plate 209, the limiting push plate 209 can be squeezed to slide along the outer wall of the fixed guide plate 2010. At the same time, the limiting push plate 209 squeezes the end surface of the connecting push block 207 by moving, so that the two arc-shaped rotating plates 4 can be automatically closed.

[0085] Afterwards, the connecting rotating cylinder 301 can be rotated with the fixing frame 306 and the supporting arm 6 respectively through the rotating shaft. In this process, the arc-shaped rotating plate 4 can be rotated to the bottom of the rangefinder body 1 under the drive of the supporting arm 6 with the rotating shaft as the axis, so that the space occupied by the device when carried can be effectively reduced by folding, thereby achieving the purpose of conveniently storing and carrying the rangefinder body 1.

[0086] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A plant stem diameter measuring device, comprising a rangefinder body (1), one end of the rangefinder body (1) is provided with a support arm (6), the end of the support arm (6) away from the rangefinder body (1) is symmetrically provided with two arc-shaped rotating plates (4), the two arc-shaped rotating plates (4) are both rotatably connected to the support arm (6) through a rotating shaft, the inner walls of the two arc-shaped rotating plates (4) are both circumferentially equidistantly provided with a plurality of laser transmitters (5), the top of the rangefinder body (1) is provided with a display screen (7), and the insides of the two arc-shaped rotating plates (4) are both provided with laser receivers, characterized in that: The support arm (6) is provided with a rotating mechanism for driving the two arc-shaped rotating plates (4) to rotate in opposite directions respectively; The rotating mechanism comprises: two fixed sleeves (202) symmetrically fixedly connected to the outer wall of the support arm (6), the two fixed sleeves (202) being respectively located at the upper and lower ends of the support arm (6) away from the end of the rangefinder body (1); One end of the support arm (6) close to the rangefinder body (1) is provided with a folding mechanism for folding and storing the support arm (6) or unfolding and supporting the support arm (6).

2. The device for measuring plant stem diameter according to claim 1, characterized in that: The rotating mechanism further comprises: a rotating assembly arranged inside the fixed sleeve frame (202), the rotating assembly being used to respectively drive the two arc-shaped rotating plates (4) to rotate; The rotating assembly comprises: two gears (208) symmetrically arranged inside the fixed sleeve (202); the two gears (208) are rotatably connected to the fixed sleeve (202) via a rotating shaft; the two gears (208) are respectively fixedly connected to two arc-shaped rotating plates (4) via a connecting shaft; and the support arm (6) is rotatably connected to the connecting shaft via a bearing; The fixed sleeve frame (202) is provided with a moving assembly, and the moving assembly is used to drive the two gears (208) to rotate in opposite directions.

3. The plant stem diameter measuring device according to claim 2, characterized in that: The moving assembly comprises: a moving push block (203) arranged at one end of the fixed sleeve (202) away from the support arm (6), the moving push block (203) penetrates into the interior of the fixed sleeve (202), the moving push block (203) is slidably connected to the fixed sleeve (202), and a rack (201) is fixedly connected to one end of the moving push block (203) close to the support arm (6), the rack (201) is located inside the fixed sleeve (202), and the rack (201) is meshedly connected with two gears (208) respectively; A limiting component is provided at one end of the rack (201), and the limiting component is used to perform extrusion limiting on the rack (201).

4. The device for measuring plant stem diameter according to claim 3, characterized in that: The limiting assembly comprises: a connecting push block (207) arranged at one end of the rack (201); the outer wall of the connecting push block (207) is slidably sleeved with a movable sliding frame (206); the movable sliding frame (206) is fixedly connected to the rack (201); and the movable sliding frame (206) is slidably connected to the support arm (6) and the fixed sleeve frame (202); A guide assembly is arranged on the outer side of the connecting push block (207), and the guide assembly is used to squeeze and move the sliding frame (206) to move.

5. The device for measuring plant stem diameter according to claim 4, characterized in that: The guide assembly comprises: two guide pressing blocks (204) symmetrically fixedly connected to the outer wall of the connecting push block (207), the two guide pressing blocks (204) being respectively located at the upper and lower ends of the connecting push block (207), the two guide pressing blocks (204) both passing through the interior of the movable slide frame (206), and guide inclined grooves (205) for the guide pressing blocks (204) to slide are provided at the connecting positions of the movable slide frame (206) and the two guide pressing blocks (204); A pressing component is provided on one side of the connecting push block (207), and the pressing component is used to press and fix the connecting push block (207).

6. The device for measuring plant stem diameter according to claim 5, characterized in that: The extrusion assembly comprises: a fixed guide plate (2010) arranged on one side of the connecting push block (207), the fixed guide plate (2010) being fixedly connected to the fixed sleeve frame (202), the outer wall of the fixed guide plate (2010) being sleeved with a limiting push plate (209), the limiting push plate (209) penetrating to the outside of one end of the fixed sleeve frame (202), and the limiting push plate (209) being slidably connected to the fixed sleeve frame (202) and the fixed guide plate (2010).

7. The device for measuring plant stem diameter according to claim 1, characterized in that: The folding mechanism comprises: a folding component arranged at one end of the support arm (6) close to the rangefinder body (1), the folding component being used to fold the rangefinder body (1) and the support arm (6); The folding assembly comprises: a connecting rotating cylinder (301) rotatably connected to an end of a support arm (6) close to a rangefinder body (1) via a rotating shaft, an end of the connecting rotating cylinder (301) away from the support arm (6) being rotatably connected to a fixing frame (306) via a rotating shaft, and the fixing frame (306) being fixedly connected to the rangefinder body (1); A support assembly is provided on the outer side of the support arm (6), and the support assembly is used to horizontally support the support arm (6), the connecting drum (301), and the fixing frame (306).

8. The device for measuring plant stem diameter according to claim 7, characterized in that: The support assembly comprises: two fixed blocks (303) symmetrically fixedly connected to the outer wall of the support arm (6); one end of the two fixed blocks (303) close to the rangefinder body (1) is fixedly connected to a limit rod (305); the outer wall of the limit rod (305) is slidably sleeved with a support sleeve (302); the support sleeve (302) is located outside the connecting drum (301); the support sleeve (302) is in contact with the outer wall of one end of the rangefinder body (1); two groups of balls (308) are symmetrically arranged at the upper and lower ends of the inner wall of the support sleeve (302); the two groups of balls (308) are in contact with the outer walls of the support arm (6), the connecting drum (301) and the fixed frame (306) respectively; a group of balls (308) is provided with a plurality of balls, and the plurality of balls (308) are arranged in the interior of the support sleeve (302) at equal intervals in the transverse direction; The support sleeve frame (302) is provided with a reset component, and the reset component is used to push the support sleeve frame (302) to automatically reset.

9. The device for measuring plant stem diameter according to claim 8, characterized in that: The reset component comprises: two movable pressing grooves (307) symmetrically opened on the inner wall of the support sleeve frame (302), the two movable pressing grooves (307) are respectively located on the outer sides of the two limiting rods (305), the outer walls of the two limiting rods (305) are both sleeved with springs (304), one end of the spring (304) is in contact with the outer wall of the fixed block (303), and the other end of the spring (304) is in contact with the inner wall of the movable pressing groove (307).

10. A method for using the plant stem diameter measuring device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Push the movable push block (203) to make the two arc-shaped rotating plates (4) in an open state, move the two arc-shaped rotating plates (4) to the outside of the plant stem, and then push the movable push block (203) to make the two arc-shaped rotating plates (4) sleeve the plant stem, thereby improving the efficiency of sleeve sleeve of the plant stem; Step 2: Start the rangefinder body (1), and then the outer wall of the plant stem can be scanned through the cooperation of the laser transmitter (5) and the laser receiver. At the same time, the handheld rangefinder body (1) drives the two arc-shaped rotating plates (4) to rise and fall through the support arm (6). At this time, the laser scanning data is displayed in real time through the display screen (7), so that the thickness of the plant stem can be accurately measured; Step 3: After the measurement is completed, push the support sleeve (302) to fold the support arm (6) so as to facilitate the convenient folding and storage of the device, effectively reducing the space occupied by the device when it is carried.

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