Corn plant height measuring device and use method thereof

Abstract

The present invention is applicable to the technical field related to corn plant height measurement, and provides a corn plant height measurement device and a use method thereof, wherein the device comprises a main rod body, a soil insertion unit connected to external soil is arranged at the lower end of the main rod body, a first connecting block is connected to the main rod body through a rotating unit, a height measuring unit is arranged on the first connecting block, the height measuring unit comprises a measuring inner rod and a measuring outer cylinder, a clamping unit for clamping blades is arranged on the measuring inner rod, and a recording unit for recording the measured height is arranged on the first connecting block. According to the position of the corn plant to be measured, the present invention fixes the entire device around it through the soil insertion unit, the rotating unit adjusts the clamping position of the clamping unit to find the highest blade position, the corn leaf to be measured is clamped by the clamping unit, and the vertical distance from the measured leaf in a straight state to the ground is recorded by the recording unit.

Description

Technical Field

[0001] The invention belongs to the technical field related to corn plant height measurement, and in particular relates to a corn plant height measurement device and a use method thereof. Background Art

[0002] In order to accurately grasp the growth and development status of corn in real time, facilitate scientific management, carry out classified guidance, promote seedling transformation, and effectively improve the yield level, it is necessary to conduct periodic measurements of corn plant height during the growth and development of corn. Based on the measurement results, it is possible to judge whether the growth and development of corn is normal, so that farmers can take precise field management measures.

[0003] After searching, the applicant found a Chinese utility model patent with patent publication number CN210952620U, entitled A device for measuring the height of corn plants for agriculture. A limiting tube is arranged at one end of a movable rod. When measuring the height of corn plants, the corn plants can be clamped in the limiting tube to limit the position of the corn plants, thereby preventing the wind in nature from blowing the corn plants to shake during measurement, thereby reducing measurement errors. However, when the above device is actually used, there are some shortcomings. With the different growth cycles of corn, the measurement method of plant height is different. Before the stamens are pulled out, the plant height of corn refers to the length of the tip of the corn leaf after the corn leaves are straightened. The existing device cannot accurately measure the height of the corn plant before the stamens are pulled out. Based on this, an agricultural corn plant height measuring device and a method of using the device are now proposed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a corn plant height measuring device, which aims to solve the problem that the measurement method of plant height is different with the different growth cycles of corn. Before the stamens are pulled out, the plant height of corn refers to the length of the tip of the corn leaf after the corn leaf is straightened. The existing device cannot accurately measure the height of the corn plant before the stamens are pulled out.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A corn plant height measuring device comprises a main rod body, a soil insertion unit connected to external soil is arranged at the lower end of the main rod body, a first connecting block is connected to the main rod body through a rotating unit, a height measuring unit is arranged on the first connecting block, the height measuring unit comprises a measuring inner rod and a measuring outer cylinder, the measuring outer cylinder is sleeved on the outer side of the measuring inner rod, a clamping unit for clamping blades is arranged on the measuring inner rod, a recording unit for recording the measured height is arranged on the first connecting block, an outer sleeve is fixedly connected to the first connecting block, and a support ring is fixedly connected to the measuring outer cylinder.

[0007] The soil inserting unit includes a first connecting plate, a threaded sleeve is fixedly connected to the first connecting plate, the threaded sleeve is threadedly connected to the main rod body, the lower end of the first connecting plate is connected to the second connecting plate through a fine-tuning unit, and the lower end of the second connecting plate is fixedly connected to a plurality of symmetrically arranged soil inserting spikes.

[0008] The fine-tuning unit includes a symmetrically arranged threaded rod fixedly connected to the second connecting plate, an anti-slip plate fixedly connected to the end of the threaded rod, a rotating plate sleeved on the outer side of the threaded rod, rotating protrusions distributed in a circumferential array fixedly connected around the rotating plate, a supporting hemisphere in contact with the first connecting plate fixedly connected to the upper end of the rotating plate, a level ruler fixedly connected to the second connecting plate, the lower end of the first connecting plate rotatably connected to the supporting plate via a first rotating shaft, and the lower end of the support plate fixedly connected to the second connecting plate.

[0009] The side surface of the main rod body is fixedly connected with a first handle distributed in a circumferential array.

[0010] The rotating unit includes a first rotating ring fixedly connected to the main rod body through a fifth connecting plate, the first rotating ring being fixedly connected to an annular clamping protrusion, the first rotating ring being provided with a second rotating ring, and the second rotating ring being provided with an annular clamping groove matching the annular clamping protrusion, the first rotating ring and the second rotating ring being provided with openings for the corn plant to pass through, the first rotating ring being fixedly connected to the side surface of the first rotating ring, the second rotating ring being fixedly connected to the side surface of the second rotating ring, the first connecting ring and the second connecting ring being provided with openings, the second connecting ring being inserted with an insertion rod, the upper end of the insertion rod being fixedly connected to a third connecting plate, the third connecting plate being connected to the second connecting ring through a first spring for providing elastic force, the first spring being sleeved on the outer side of the insertion rod, the first connecting ring being provided with a plurality of insertion holes in a circumferential array matching the insertion rod, and the second connecting ring being fixedly connected to the first connecting block.

[0011] The clamping unit includes a fourth connecting plate, which is fixedly connected to the measuring inner rod through a first connecting rod, and two symmetrically arranged moving rods are inserted into the fourth connecting plate, one end of the moving rod is fixedly connected to a limiting plate, and the limiting plate is connected to the fourth connecting plate through a second spring for providing elastic force, and the second spring is sleeved on the outer side of the moving rod, and the other end of the moving rod is fixedly connected to a second connecting block, and a clamping roller is rotatably connected between the two second connecting blocks through a second rotating shaft, and a clamping block is fixedly connected to the side of the fourth connecting plate.

[0012] The clamping block is provided with a clamping curved surface, and two of the clamping blocks are fixedly connected with a second handle.

[0013] The outer side of the measuring outer cylinder is fixedly connected with a plurality of rotating protrusions distributed in a circumferential array, and the measuring inner rod is fixedly connected with a third handle.

[0014] The recording unit comprises a second connecting rod fixedly connected to the first connecting block, a plurality of rotating blocks distributed in an array and not interfering with each other are sleeved on the outer side of the second connecting rod, and a rotating rod is fixedly connected to the measuring outer cylinder.

[0015] A method for using a corn plant height measuring device, the steps comprising:

[0016] Step 1: Stably insert the second connecting plate into the soil by inserting the soil spikes, and ensure that the first connecting plate is in a horizontal position by rotating the rotating protrusion and cooperating with the level ruler, so as to ensure that the entire device is in a vertical position when measuring;

[0017] Step 2: After the soil insertion unit limits the position of the entire device, the corn plant is placed through the opening into the first rotating ring and the second rotating ring. At this time, the main rod body has been limited and cannot be moved or rotated. Then, according to the position of the highest blade, the position of the second rotating ring is adjusted with the cooperation of the annular clamping protrusion and the annular clamping groove, so that the clamping unit provided on it is aligned with the highest blade. After rotating to the appropriate position, the insertion rod is inserted into the insertion hole at the corresponding position, and the second rotating ring can no longer rotate. The rotating unit completes the position adjustment, and the clamping roller and the clamping block cooperate to clamp the highest blade under the elastic force of the spring;

[0018] Step 3: When recording the position of the highest blade extending from the ground, hold the third handle to move the measuring inner rod and the measuring outer sleeve upward. With the cooperation of the clamping unit, the blade extends upward. When it moves to the uppermost end and the blade just leaves the clamping unit, use your finger to move the rotating protrusion to drive the measuring outer tube to rotate. The rotating rod on the measuring outer tube contacts the rotating block, driving the rotating block to rotate. The rotating block is provided with a scale, and the measurement personnel can record the rotation of the rotating block.

[0019] The beneficial effects of the present invention are as follows: the entire device is fixed around the position of the corn plant to be measured by the soil insertion unit, the rotating unit adjusts the clamping position of the clamping unit to find the highest leaf position, the corn leaf to be measured is clamped by the clamping unit, and the vertical distance from the measured leaf in a straight state to the ground is recorded by the recording unit.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 The overall structure of a corn plant height measuring device provided by the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 3 The overall structure of a corn plant height measuring device provided by the present invention is shown in FIG. Figure 2 ;

[0025] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 5 yes Figure 3 Schematic diagram of the enlarged structure at C in the middle;

[0027] Figure 6 yes Figure 3 Schematic diagram of the enlarged structure at D in the middle;

[0028] Figure 7 yes Figure 3 Schematic diagram of the enlarged structure at E in the middle;

[0029] Figure 8 It is a schematic diagram of the clamping structure of the first rotating ring and the second rotating ring in a corn plant height measuring device provided by the present invention;

[0030] Fig. 9 yes Figure 8 The enlarged structural diagram at F in the middle;

[0031] Fig.10 It is a side structural schematic diagram of a fine-tuning unit in a corn plant height measuring device provided by the present invention;

[0032] Fig.11 It is a partial structural schematic diagram of a fine-tuning unit in a corn plant height measuring device provided by the present invention.

[0033] Notes on reference numerals: 1. main rod body; 2. first connecting block; 3. measuring inner rod; 4. measuring outer tube; 5. outer sleeve; 6. supporting ring; 101. first connecting plate; 102. threaded sleeve; 103. second connecting plate; 104. soil-inserting spike; 201. threaded rod; 202. anti-slip plate; 203. rotating plate; 204. rotating protrusion; 205. supporting hemisphere; 206. level ruler; 207. first rotating shaft; 208. supporting plate; 7. first handle; 301. first rotating ring; 302. annular clamping protrusion; 303. second rotating ring; 304. annular clamping groove; 3 05, first connecting ring; 306, second connecting ring; 307, plug rod; 308, third connecting plate; 309, first spring; 310, plug hole; 311, fifth connecting plate; 401, fourth connecting plate; 402, first connecting rod; 403, moving rod; 404, limit plate; 405, second spring; 406, second connecting block; 407, second rotating shaft; 408, clamping roller; 409, clamping block; 410, clamping surface; 411, second handle; 8, rotating protrusion; 9, third handle; 501, second connecting rod; 502, rotating block; 503, rotating rod. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 11 As shown, the present invention is a corn plant height measuring device, comprising a main rod body 1, the lower end of the main rod body 1 is provided with a soil insertion unit connected to the external soil, the main rod body 1 is connected with a first connecting block 2 through a rotating unit, the first connecting block 2 is provided with a height measuring unit, the height measuring unit comprises a measuring inner rod 3 and a measuring outer cylinder 4, the measuring outer cylinder 4 is sleeved on the outer side of the measuring inner rod 3, the measuring inner rod 3 is provided with a clamping unit for clamping a blade, the first connecting block 2 is provided with a recording unit for recording the measured height, the first connecting block 2 is fixedly connected with an outer sleeve 5, and the measuring outer cylinder 4 is fixedly connected with a support ring 6.

[0036] When the above-mentioned device is actually used, the entire device is fixed around the position of the corn plant to be measured through the soil insertion unit, and the rotating unit adjusts the clamping position of the clamping unit to find the highest leaf position. The corn leaf to be measured is clamped by the clamping unit, and the vertical distance from the measured leaf in the straight state to the ground is recorded by the recording unit.

[0037] Combination Figure 7 , Fig.10 and Fig.11 The soil insertion unit includes a first connecting plate 101, to which a threaded sleeve 102 is fixedly connected. The threaded sleeve 102 is threadedly connected to the main rod body 1. The lower end of the first connecting plate 101 is connected to a second connecting plate 103 through a fine-tuning unit. The lower end of the second connecting plate 103 is fixedly connected to a plurality of symmetrically arranged soil insertion spikes 104.

[0038] The fine-tuning unit includes a symmetrically arranged threaded rod 201 fixedly connected to the second connecting plate 103, the end of the threaded rod 201 is fixedly connected to an anti-slip plate 202, the outer side of the threaded rod 201 is sleeved with a rotating plate 203, the rotating plate 203 is fixedly connected with rotating protrusions 204 distributed in a circumferential array around, the upper end of the rotating plate 203 is fixedly connected to a supporting hemisphere 205 in contact with the first connecting plate 101, the second connecting plate 103 is fixedly connected to a level ruler 206, the lower end of the first connecting plate 101 is rotatably connected to a support plate 208 via a first rotating shaft 207, and the lower end of the support plate 208 is fixedly connected to the second connecting plate 103.

[0039] When the above-mentioned soil insertion unit is actually used, the second connecting plate 103 is stably inserted into the soil through the soil insertion spikes 104, and by rotating the rotating protrusion 204 and cooperating with the level ruler 206, the first connecting plate 101 is ensured to be in a horizontal position, ensuring that the entire device is in a vertical position when measuring.

[0040] The side surface of the main rod body 1 is fixedly connected with a first handle 7 distributed in a circumferential array.

[0041] Combination Figure 6 , Figure 8 and Fig. 9The rotating unit includes a first rotating ring 301 fixedly connected to the main rod body 1 through a fifth connecting plate 311, the first rotating ring 301 is fixedly connected with an annular clamping protrusion 302, the first rotating ring 301 is provided with a second rotating ring 303, the second rotating ring 303 is provided with an annular clamping groove 304 matched with the annular clamping protrusion 302, the first rotating ring 301 and the second rotating ring 303 are both provided with openings for the corn plant to pass through, the side of the first rotating ring 301 is fixedly connected with a first connecting ring 305, and the side of the second rotating ring 303 is fixedly connected There is a second connecting ring 306, and openings are provided on the first connecting ring 305 and the second connecting ring 306. An insertion rod 307 is inserted into the second connecting ring 306, and the upper end of the insertion rod 307 is fixedly connected to a third connecting plate 308. The third connecting plate 308 is connected to the second connecting ring 306 through a first spring 309 for providing elastic force. The first spring 309 is sleeved on the outer side of the insertion rod 307. A plurality of sockets 310 in a circular array that cooperate with the insertion rod 307 are provided on the first connecting ring 305, and the second connecting ring 306 is fixedly connected to the first connecting block 2.

[0042] When the above-mentioned rotating unit is actually used, after the soil insertion unit limits the position of the entire device, the corn plant is placed through the opening into the first rotating ring 301 and the second rotating ring 303. At this time, the main rod body 1 has been limited and cannot be moved or rotated. Then, according to the position of the highest blade, the position of the second rotating ring 303 is adjusted with the cooperation of the annular clamping protrusion 302 and the annular clamping groove 304, so that the clamping unit provided on it is aligned with the highest blade. After rotating to the appropriate position, the insertion rod 307 is inserted into the socket 310 at the corresponding position, and the second rotating ring 303 can no longer rotate, and the rotating unit completes the position adjustment.

[0043] Combination Figure 5 The clamping unit includes a fourth connecting plate 401, which is fixedly connected to the measuring inner rod 3 through a first connecting rod 402, and two symmetrically arranged moving rods 403 are inserted on the fourth connecting plate 401, one end of the moving rod 403 is fixedly connected to a limiting plate 404, and the limiting plate 404 is connected to the fourth connecting plate 401 through a second spring 405 for providing elastic force, and the second spring 405 is sleeved on the outer side of the moving rod 403, and the other end of the moving rod 403 is fixedly connected to a second connecting block 406, and a clamping roller 408 is rotatably connected between the two second connecting blocks 406 through a second rotating shaft 407, and a clamping block 409 is fixedly connected to the side of the fourth connecting plate 401.

[0044] The clamping block 409 is provided with a clamping curved surface 410 , and two of the clamping blocks 409 are fixedly connected with a second handle 411 .

[0045] When the clamping unit is actually used, the highest blade is clamped by the cooperation of the clamping roller 408 and the clamping block 409 under the elastic force of the spring.

[0046] The outer side of the measuring outer cylinder 4 is fixedly connected with a plurality of rotating protrusions 8 distributed in a circumferential array, and the measuring inner rod 3 is fixedly connected with a third handle 9 .

[0047] Combination Figure 2 and Figure 4 The recording unit includes a second connecting rod 501 fixedly connected to the first connecting block 2, and a plurality of rotating blocks 502 distributed in an array and not interfering with each other are sleeved on the outer side of the second connecting rod 501, and a rotating rod 503 is fixedly connected to the measuring outer cylinder 4.

[0048] When recording the position of the highest blade extending from the ground, hold the third handle 9 to drive the measuring inner rod 3 and the measuring outer sleeve 5 to move upward. With the cooperation of the clamping unit, the blade extends upward. When it moves to the uppermost end and the blade just leaves the position of the clamping unit, use your fingers to move the rotating protrusion 8 to drive the measuring outer cylinder 4 to rotate. The rotating rod 503 provided on the measuring outer cylinder 4 contacts the rotating block 502, driving the rotating block 502 to rotate. The rotating block 502 is provided with a scale, and the measurement personnel can record the rotation of the rotating block 502.

[0049] A method for using a corn plant height measuring device, the steps comprising:

[0050] Step 1: The second connecting plate 103 is stably inserted into the soil by the soil-inserting spikes 104, and the first connecting plate 101 is ensured to be in a horizontal position by rotating the rotating protrusion 204 to cooperate with the level ruler 206, so as to ensure that the entire device is in a vertical position when measuring;

[0051] Step 2: After the soil insertion unit limits the position of the entire device, the corn plant is placed through the opening into the first rotating ring 301 and the second rotating ring 303. At this time, the main rod body 1 has been limited and cannot be moved or rotated. Then, according to the position of the highest blade, the second rotating ring 303 is adjusted in position with the cooperation of the annular clamping protrusion 302 and the annular clamping groove 304, so that the clamping unit provided thereon is aligned with the highest blade. After rotating to a suitable position, the insertion rod 307 is inserted into the insertion hole 310 at the corresponding position, and the second rotating ring 303 can no longer rotate. The rotating unit completes the position adjustment, and the clamping roller 408 and the clamping block 409 cooperate to clamp the highest blade under the elastic force of the spring;

[0052] Step three: when recording the position of the highest blade extending from the ground, hold the third handle 9 to drive the measuring inner rod 3 and the measuring outer sleeve 5 to move upward. With the cooperation of the clamping unit, the blade extends upward. When it moves to the uppermost end and the blade just leaves the position of the clamping unit, use your finger to move the rotating protrusion 8 to drive the measuring outer cylinder 4 to rotate. The rotating rod 503 provided on the measuring outer cylinder 4 contacts the rotating block 502, driving the rotating block 502 to rotate. The rotating block 502 is provided with a scale, and the measurement personnel can record the rotation of the rotating block 502.

[0053] To sum up, the working principle of the present invention is: according to the position of the corn plant to be measured, the entire device is fixed around it through the soil insertion unit, the rotating unit adjusts the clamping position of the clamping unit to find the highest leaf position, the corn leaf to be measured is clamped by the clamping unit, and then the vertical distance from the measured leaf in a straight state to the ground is recorded by the recording unit.

[0054] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A corn plant height measuring device, characterized in that: The invention comprises a main rod body (1), the lower end of the main rod body (1) is provided with a soil insertion unit connected to external soil, the main rod body (1) is connected to a first connection block (2) via a rotating unit, the first connection block (2) is provided with a height measuring unit, the height measuring unit comprises a measuring inner rod (3) and a measuring outer cylinder (4), the measuring outer cylinder (4) is sleeved on the outer side of the measuring inner rod (3), the measuring inner rod (3) is provided with a clamping unit for clamping a blade, and the first connection block (2) is provided with a A recording unit for recording measured height, wherein the first connecting block (2) is fixedly connected to an outer sleeve (5), and the measuring outer sleeve (4) is fixedly connected to a support ring (6); the rotating unit comprises a first rotating ring (301) fixedly connected to the main rod body (1) via a fifth connecting plate (311), an annular clamping protrusion (302) is fixedly connected to the first rotating ring (301), a second rotating ring (303) is provided on the first rotating ring (301), and a second rotating ring (303) is provided with a protrusion corresponding to the measured height. The annular snap-fitting protrusion (302) cooperates with the annular snap-fitting groove (304), the first rotating ring (301) and the second rotating ring (303) are both provided with openings for the corn plant to pass through, a first connecting ring (305) is fixedly connected to the side of the first rotating ring (301), and a second connecting ring (306) is fixedly connected to the side of the second rotating ring (303), the first connecting ring (305) and the second connecting ring (306) are both provided with openings, and the second connecting ring (306) is provided with an insert A rod (307), the upper end of the insertion rod (307) is fixedly connected to a third connecting plate (308), the third connecting plate (308) is connected to the second connecting ring (306) via a first spring (309) for providing elastic force, the first spring (309) is sleeved on the outside of the insertion rod (307), the first connecting ring (305) is provided with a plurality of jacks (310) in a circumferential array for matching with the insertion rod (307), and the second connecting ring (306) is fixedly connected to the first connecting block (2);The clamping unit comprises a fourth connecting plate (401), the fourth connecting plate (401) being fixedly connected to the measuring inner rod (3) via a first connecting rod (402), two symmetrically arranged moving rods (403) being inserted into the fourth connecting plate (401), one end of the moving rod (403) being fixedly connected to a limiting plate (404), the limiting plate (404) being connected to the fourth connecting plate (401) via a second spring (405) for providing elastic force, the second spring (405) being configured to extend the measuring inner rod (3) and the measuring inner rod (3). ) is sleeved on the outside of the moving rod (403); the other end of the moving rod (403) is fixedly connected to a second connecting block (406); a clamping roller (408) is rotatably connected between the two second connecting blocks (406) via a second rotating shaft (407); a clamping block (409) is fixedly connected to the side of the fourth connecting plate (401); a clamping curved surface (410) is provided on the clamping block (409); and a second handle (411) is fixedly connected to the two clamping blocks (409). ; 2. A corn plant height measuring device as claimed in claim 1, characterized in that: The soil inserting unit comprises a first connecting plate (101), a threaded sleeve (102) being fixedly connected to the first connecting plate (101), the threaded sleeve (102) being threadedly connected to the main rod body (1), the lower end of the first connecting plate (101) being connected to a second connecting plate (103) via a fine-tuning unit, the lower end of the second connecting plate (103) being fixedly connected to a plurality of symmetrically arranged soil inserting spikes (104).

3. A corn plant height measuring device as claimed in claim 2, characterized in that: The fine-tuning unit comprises a symmetrically arranged threaded rod (201) fixedly connected to the second connecting plate (103), an anti-slip plate (202) fixedly connected to the end of the threaded rod (201), a rotating plate (203) sleeved on the outer side of the threaded rod (201), rotating protrusions (204) distributed in a circumferential array fixedly connected to the periphery of the rotating plate (203), a supporting hemisphere (205) in contact with the first connecting plate (101) fixedly connected to the upper end of the rotating plate (203), a level ruler (206) fixedly connected to the second connecting plate (103), a supporting plate (208) rotatably connected to the lower end of the first connecting plate (101) via a first rotating shaft (207), and a lower end of the supporting plate (208) fixedly connected to the second connecting plate (103).

4. A corn plant height measuring device as claimed in claim 3, characterized in that: The side surface of the main rod body (1) is fixedly connected with first handles (7) distributed in a circumferential array.

5. A corn plant height measuring device as claimed in claim 4, characterized in that: A plurality of rotating protrusions (8) distributed in a circumferential array are fixedly connected to the outer side of the measuring outer cylinder (4), and a third handle (9) is fixedly connected to the measuring inner rod (3).

6. A corn plant height measuring device as claimed in claim 5, characterized in that: The recording unit comprises a second connecting rod (501) fixedly connected to the first connecting block (2), a plurality of rotating blocks (502) distributed in an array and not interfering with each other are sleeved on the outer side of the second connecting rod (501), and a rotating rod (503) is fixedly connected to the measuring outer cylinder (4).

7. A method for using a corn plant height measuring device, characterized in that: The method of using the corn plant height measuring device as claimed in claim 6 comprises the following steps: Step 1: The second connecting plate (103) is stably inserted into the soil by means of the soil-inserting spikes (104), and the rotating protrusion (204) is rotated to cooperate with the level ruler (206) to ensure that the first connecting plate (101) is in a horizontal position, and the entire device is in a vertical position when measuring; Step 2: After the soil insertion unit limits the position of the entire device, the corn plant is placed through the opening into the first rotating ring (301) and the second rotating ring (303). At this time, the main rod body (1) has been limited and cannot be moved or rotated. Then, according to the position of the highest blade, the second rotating ring (303) is adjusted in position with the cooperation of the annular clamping protrusion (302) and the annular clamping groove (304), so that the clamping unit provided on it is aligned with the highest blade. After rotating to a suitable position, the insertion rod (307) is inserted into the insertion hole (310) at the corresponding position, and the second rotating ring (303) can no longer rotate. The rotating unit completes the position adjustment, and the clamping roller (408) and the clamping block (409) cooperate to clamp the highest blade under the elastic force of the spring; Step 3: When recording the position of the blade at the highest point extending from the ground, hold the third handle (9) to drive the measuring inner rod (3) and the measuring outer sleeve (5) to move upward. With the cooperation of the clamping unit, the blade extends upward. When it moves to the uppermost end and the blade just leaves the clamping unit, use a finger to move the rotating protrusion (8) to drive the measuring outer cylinder (4) to rotate. The rotating rod (503) provided on the measuring outer cylinder (4) contacts the rotating block (502), driving the rotating block (502) to rotate. The rotating block (502) is provided with a scale, and the measurement personnel can record the rotation of the rotating block (502).

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