Soil humidity detection device for evaluating crop irrigation water demand

Abstract

The invention relates to the technical field of soil detection, and discloses a soil humidity detection device for crop irrigation water demand evaluation, which comprises a drill cylinder, a stone removing mechanism located in the drill cylinder, a soil pressing mechanism and a humidity detection mechanism, the stone removing mechanism comprises a plurality of rotary cutting blades arranged in an annular array mode, a mounting ring coaxial with the drilling barrel and a center head, and the rotary cutting blades are fixedly connected to the mounting ring and the center head and are obliquely arranged; the mounting ring is fixedly connected to the inner wall of the drilling barrel through a bolt; the soil pressing mechanism comprises a pressing plate, a bearing plate and an abutting spring, and the pressing plate is located below the bearing plate; the humidity detection mechanism comprises a plurality of detection probes, a mounting pipe for mounting the detection probes and a driving assembly, mounting holes for mounting the detection probes are formed in the side wall of the mounting pipe, and the detection probes are in sliding fit with the mounting holes. The purpose of the invention is to effectively prevent the detection probe from being damaged due to collision between the detection probe and stones in soil.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil detection, and particularly relates to a soil humidity detection device for evaluating the water requirement of crop irrigation. Background Art

[0002] Soil humidity detection plays an important role in fields such as agriculture, ecology, and environmental science. Soil humidity detection can help farmers and farm managers understand the soil moisture status, thereby guiding irrigation activities. Moreover, soil humidity is one of the important factors affecting plant growth and development. By monitoring soil humidity, the irrigation amount and frequency of crops can be adjusted in a timely manner to meet the water requirements of crops and promote the healthy growth of crops. Soil humidity is one of the important environmental factors affecting the function and dynamics of ecosystems. By monitoring soil humidity, the distribution and change laws of soil moisture in ecosystems can be deeply understood, providing a scientific basis for ecosystem management and protection.

[0003] The invention patent with the application number CN202411622110.1 discloses a soil humidity detection device for information-based water conservancy irrigation, including: a suspension mechanism and a transmission mechanism. When driving the transmission mechanism through a motor, the suspension mechanism can drive the spiral drill rod to rotate and drive the lifting platform to move up and down, so that the suspension mechanism can be telescoped, and then the height of the spiral drill rod can be adjusted, realizing that only one motor can complete the lifting, rotation, and drilling work of the spiral drill rod. A pressing and reset mechanism is arranged at the top of the installation frame, and the position of the wireless humidity detector in the suspension mechanism is adjusted through the pressing and reset mechanism, so that during the process of drilling or pulling out the spiral drill rod, the humidity sensor can be effectively protected, avoiding the humidity sensor from being worn and collided with soil stones during the drilling work, and greatly improving the service life and detection accuracy of the humidity sensor. However, there are still certain deficiencies in the above scheme

[0004] 1. This scheme first drills a hole through the spiral drill rod, pre-drills a pit, and then ejects the humidity sensor to detect the humidity of the soil. Although this operation can avoid the humidity sensor from colliding with the stones in the soil during the drilling process, however, since some stones still remain in the pit after drilling, when the sensor is ejected outwards, it may still collide with the stones, causing damage to the sensor.

[0005] 2. This scheme will destroy the original pore structure of the soil by pre-drilling, resulting in the measured value deviating from the true humidity.

[0006] In view of this, the inventor of the present invention has conducted in-depth research on the above defects in the prior art, and thus this case has arisen. Summary of the Invention

[0007] The object of the present invention is to provide a soil moisture detection device for evaluating the water requirement of crop irrigation, which can effectively avoid the damage of the detection probe caused by the collision between the detection probe and the stones in the soil.

[0008] To achieve the above technical object, the technical solution adopted by the present invention is as follows:

[0009] A soil moisture detection device for evaluating the water requirement of crop irrigation, comprising a drill cylinder, a stone removing mechanism, a soil compressing mechanism and a humidity detection mechanism located in the drill cylinder; the stone removing mechanism includes a plurality of rotary cutting blades arranged in a circular array, a mounting ring coaxially arranged with the drill cylinder and a center head, the rotary cutting blades are fixedly connected between the mounting ring and the center head, and the rotary cutting blades are inclined; the mounting ring is fixedly connected to the inner wall of the drill cylinder by bolts; the soil compressing mechanism includes a pressing plate, a bearing plate and a top spring, the pressing plate is located below the bearing plate, the upper end of the top spring is fixedly connected to the bottom of the bearing plate, and the lower end is fixedly connected to the top of the pressing plate; the humidity detection mechanism includes a plurality of detection probes, a mounting pipe for mounting the detection probes and a driving component for driving the detection probes to extend out of the mounting pipe and enter the soil, the plurality of detection probes are arranged in a circular array with the axis of the mounting pipe as the center line, mounting holes for mounting the detection probes are formed on the side wall of the mounting pipe, and the detection probes are slidably matched with the mounting holes; the bottom end of the mounting pipe is rotatably connected to the center head, and the top end passes through the top of the drill cylinder; through holes for the mounting pipe to pass through are formed on both the pressing plate and the bearing plate; the detection probes are located between the rotary cutting blades and the pressing plate.

[0010] Further, the included angle between the rotary cutting blade and the horizontal plane is 30°-45°; the stone removing mechanism further includes at least one annular blade coaxially arranged with the mounting ring, and the feeding direction of the annular blade is perpendicular to the horizontal plane. Setting the included angle between the rotary cutting blade and the horizontal plane between 30°-45° can make it easier for the rotary cutting blade to rotate into the soil and can effectively avoid soil turning outwards.

[0011] Further, it includes a filter screen, and the filter screen has a fixed ring fixedly connected to the mounting pipe and a rotating ring rotatably matched with the inner wall of the drill cylinder, and both the fixed ring and the rotating ring are coaxially arranged with the drill cylinder. The filter screen can be used to further isolate some relatively small stones.

[0012] Further, the driving assembly includes a push rod, a driving head located at the bottom end of the push rod, a first return spring for resetting the push rod, and a second return spring for resetting the detection probe; the driving head is frustum-shaped, and the diameter of the driving head gradually decreases from top to bottom; the detection probe has a contact portion that slidably contacts the driving head, a detection portion that contacts the soil, and a sliding portion that slidably contacts the mounting hole. A pressing plate is provided on the sliding portion. The second return spring is sleeved on the sliding portion, and one end of the second return spring contacts the inner wall of the mounting tube and the other end contacts the pressing plate. The driving assembly can easily push out multiple detection probes from the mounting tube and insert them into the soil for detection.

[0013] Further, a plurality of guiding grooves slidably engaged with the contact portion are further formed on the side wall of the driving head. The guiding grooves can make the sliding between the driving head and the contact portion more stable.

[0014] Further, the first return spring is located below the driving head and is coaxially arranged with the mounting tube; a connecting plate is formed at the bottom of the driving head, and the first return spring is fixedly connected to the bottom of the connecting plate. The first return spring can quickly reset the push rod.

[0015] Further, the soil pressing mechanism further includes a threaded adjustment column. A threaded connection sleeve threadedly engaged with the threaded adjustment column is formed at the top of the drill barrel; the bottom of the threaded adjustment column is rotatably connected to the bearing plate, a control knob is formed at the top of the threaded adjustment column, and the threaded adjustment column is rotatably engaged with the mounting tube. The threaded adjustment column can be used to adjust the initial position of the pressing plate to adapt to the drilling depth of the drill barrel when detecting soil humidity at different depths.

[0016] Further, an installation frame is further included. A rotation mechanism for driving the drill barrel to rotate and an adjustment mechanism for driving the drill barrel to move up and down are further provided on the installation frame; the installation frame includes a bottom plate, a top plate, a support rod supported between the bottom plate and the top plate, a guiding slide rod fixedly connected between the bottom plate and the top plate, and an installation plate slidably arranged on the guiding slide rod; a rotating sleeve rotatably engaged with the installation plate is formed on the outer wall of the drill barrel; a through hole for the drill barrel to pass through is formed at the bottom of the bottom plate; the rotation mechanism includes a first belt pulley fixedly sleeved on the outer wall of the drill barrel, a second belt pulley rotatably installed on the installation plate, a synchronous belt sleeved on the first belt pulley and the second belt pulley, and a first motor for driving the second belt pulley to rotate; the adjustment mechanism includes an adjustment screw rod rotatably installed on the bottom plate and the top plate and a second motor for driving the adjustment screw rod to rotate, and a threaded sleeve engaged with the adjustment screw rod is formed on the installation plate. The rotation mechanism and the adjustment mechanism can make the drill barrel automatically drill, reduce labor intensity, and improve work efficiency.

[0017] Furthermore, a number of saw teeth are formed at the bottom of the drill tube. The saw teeth can make it easier for the drill tube to penetrate into the soil.

[0018] Furthermore, moving rollers are provided at the bottom of the bottom plate, and a controller is provided at the top of the top plate. The moving rollers facilitate moving the device to the detection location.

[0019] After adopting the above structure, a soil humidity detection device for evaluating the water requirement of crop irrigation according to the present invention has the following beneficial effects compared with the prior art:

[0020] First, the present case uses a drill tube to drill the soil into the drill tube. During the rotation of the drill tube, the rotary cutting blade is driven to rotate. The soil is cut into the drill tube by the rotary cutting blade. At the same time, some stones are isolated by the rotary cutting blade to prevent the stones from entering the detection probe in the drill tube and causing damage.

[0021] Second, the present case uses a soil compaction mechanism to compact the soil that has entered the drill tube again, avoiding the soil from being too loose, making the soil try to restore its original pore structure, and making the measurement result more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention can be further illustrated by the non-limiting embodiments given in the drawings;

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is a schematic structural diagram of the drill tube in the present invention;

[0025] Figure 3 is Figure 3 a cross-sectional schematic diagram of;

[0026] Figure 4 is Figure 2 an internal structural schematic diagram of;

[0027] Figure 5 is Figure 3 a partial enlarged structural schematic diagram of part A in;

[0028] Figure 6 is a schematic structural diagram of the stone removal mechanism in the present invention;

[0029] Figure 7 is a schematic structural diagram of the soil compaction mechanism in the present invention;

[0030] Figure 8 is a schematic structural diagram of the ejector rod and the drive head in the present invention;

[0031] Figure 9 is a schematic structural diagram of the detection probe in the present invention.

[0032] The descriptions of the main component symbols are as follows: drill barrel 1, threaded connection sleeve 11, rotating sleeve 12, saw teeth 13, stone removal mechanism 2, rotary cutting blade 21, mounting ring 22, center head 23, annular blade 24, soil pressing mechanism 3, pressing plate 31, bearing plate 32, abutting spring 33, threaded adjustment column 34, control knob 341, humidity detection mechanism 4, detection probe 41, contact part 411, detection part 412, sliding part 413, abutting plate 414, mounting pipe 42, mounting hole 421, driving assembly 43, ejector rod 431, driving head 432, guide groove 4321, connecting plate 4322, first return spring 433, second return spring 434, bolt 5, filter screen 6, fixed ring 61, rotating ring 62, mounting bracket 7, bottom plate 71, through hole 711, moving roller 712, top plate 72, controller 721, support rod 73, guide slide bar 74, mounting plate 75, threaded sleeve 751, rotating mechanism 8, first belt pulley 81, second belt pulley 82, synchronous belt 83, first motor 84, adjustment mechanism 9, adjustment screw 91, second motor 92. Specific implementation manners

[0033] The present invention will be described in detail below with reference to the drawings and specific embodiments. It should be noted that in the drawings or the description, similar or identical parts are denoted by the same reference numerals. The implementation manners not shown or described in the drawings are those known to those of ordinary skill in the art. In addition, the directional terms mentioned in the embodiments, such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", etc., are only for reference to the directions in the drawings and are not intended to limit the protection scope of the present invention.

[0034] As Figures 1 to 9As shown in the figure, the present invention relates to a soil moisture detection device for evaluating the water requirement of crop irrigation, which includes a drilling cylinder 1, a stone removing mechanism 2 located inside the drilling cylinder 1, a soil compressing mechanism 3, and a humidity detection mechanism 4. A plurality of saw teeth 13 are formed at the bottom of the drilling cylinder 1; the stone removing mechanism 2 includes a plurality of rotary cutting blades 21 arranged in a circular array, a mounting ring 22 coaxially arranged with the drilling cylinder 1, and a center head 23. The rotary cutting blades 21 are fixedly connected to the mounting ring 22 and the center head 23. The bottom of the center head 23 is conical, and the rotary cutting blades 21 are inclined. The included angle between the rotary cutting blades 21 and the horizontal plane is 30° - 45°. In addition, the stone removing mechanism 2 further includes at least one annular blade 24 coaxially arranged with the mounting ring 22. The feeding direction of the annular blade 24 is perpendicular to the horizontal plane. By forming a grid shape between the annular blade 24 and the rotary cutting blades 21, not only can the soil be rotated into the soil, but also the stones in the soil can be removed; specifically, the mounting ring 22 is fixedly connected to the inner wall of the drilling cylinder 1 through bolts 5. After using for a period of time, the stone removing mechanism 2 can be disassembled and replaced; in this embodiment, the soil compressing mechanism 3 includes a pressing plate 31, a bearing plate 32, and a top spring 33. The pressing plate 31 is located below the bearing plate 32. The upper end of the top spring 33 is fixedly connected to the bottom of the bearing plate 32, and the lower end is fixedly connected to the top of the pressing plate 31. The pressing plate 31 is in sliding contact with the inner wall of the drilling cylinder 1. The soil entering the drilling cylinder 1 will gradually move upward until it contacts the pressing plate 31. During the continuous upward movement, through the pressure of the top spring 33, the soil is gradually compacted to try to restore the original void structure of the soil; the humidity detection mechanism 4 includes a plurality of detection probes 41, a mounting pipe 42 for mounting the detection probes 41, and a driving assembly 43 for driving the detection probes 41 to extend out of the mounting pipe 42 and enter the soil. The plurality of detection probes 41 are arranged in a circular array with the axis of the mounting pipe 42 as the center line. Mounting holes 421 for mounting the detection probes 41 are formed on the side wall of the mounting pipe 42. The detection probes 41 are in sliding fit with the mounting holes 421; the bottom end of the mounting pipe 42 is rotatably connected to the center head 23, and the top end passes through the top of the drilling cylinder 1; through holes for the mounting pipe 42 to pass through are formed on both the pressing plate 31 and the bearing plate 32; the detection probes 41 are located between the rotary cutting blades 21 and the pressing plate 31. After the stones are removed by the stone removing mechanism 2 and the soil is compacted again by the soil compressing mechanism 3, not only can it be avoided that the detection probes 41 are damaged by colliding with stones when inserted into the soil, but also the accuracy of the detection results can be ensured.

[0035] In this embodiment, in order to further isolate some small stones, a filter screen 6 is further included. The filter screen 6 has a fixing ring 61 fixedly connected to the installation pipe 42 and a rotating ring 62 rotatably fitted with the inner wall of the drilling cylinder 1. The fixing ring 61 and the rotating ring 62 are both coaxially arranged with the drilling cylinder 1, so that the filter screen 6 is rotatably connected to the inner wall of the drilling cylinder 1. The mesh of the filter screen 6 is composed of steel wires. Steel wires with a relatively small diameter are preferably selected, and the diameter can be between 0.5 mm and 1 mm. And the filter screen 6 is rotatably connected to the drilling cylinder 1. When the drilling cylinder 1 rotates, the filter screen 6 is in a static state. Therefore, the filter screen 6 cuts the soil vertically, which can minimize the damage to the soil structure.

[0036] In this embodiment, the driving assembly 43 includes a top rod 431, a driving head 432 located at the bottom end of the top rod 431, a first return spring 433 for resetting the top rod 431, and a second return spring 434 for resetting the detection probe 41. The driving head 432 is frustum-shaped, and the diameter of the driving head 432 gradually decreases from top to bottom. The detection probe 41 has a contact portion 411 that slidably contacts the driving head 432, a detection portion 412 that contacts the soil, and a sliding portion 413 that slidably contacts the installation hole 421. A pressing plate 72414 is provided on the sliding portion 413. The second return spring 434 is sleeved on the sliding portion 413, and one end of the second return spring 434 contacts the inner wall of the installation pipe 42 and the other end contacts the pressing plate 72414. The first return spring 433 is located below the driving head 432 and is coaxially arranged with the installation pipe 42. A connecting plate 4322 is formed at the bottom of the driving head 432, and the first return spring 433 is fixedly connected to the bottom of the connecting plate 4322. Through the driving assembly 43, multiple detection probes can be easily ejected from the installation pipe 42 and inserted into the soil for detection. A plurality of guiding grooves 4321 slidably engaged with the contact portion 411 are further formed on the side wall of the driving head 432. Through the guiding grooves 4321, the sliding between the driving head 432 and the contact portion 411 can be made more stable.

[0037] In this embodiment, the soil pressing mechanism 3 further includes a threaded adjusting column 34. A threaded connecting sleeve 11 that is threadedly engaged with the threaded adjusting column 34 is formed at the top of the drilling cylinder 1. The bottom of the threaded adjusting column 34 is rotatably connected to the bearing plate 32. A control knob 341 is formed at the top of the threaded adjusting column 34, and the threaded adjusting column 34 is rotatably fitted with the installation pipe 42. The initial position of the pressing plate 31 can be adjusted by using the threaded adjusting column 34, so as to adapt to the depth of the drilling cylinder 1 when detecting the soil humidity at different depths.

[0038] In this embodiment, it further includes a mounting bracket 7. The mounting bracket 7 is also provided with a rotating mechanism 8 for driving the drill barrel 1 to rotate and an adjusting mechanism 9 for driving the drill barrel 1 to move up and down. The mounting bracket 7 includes a bottom plate 71, a top plate 72, a support rod 73 supported between the bottom plate 71 and the top plate 72, a guiding slide bar 74 fixedly connected between the bottom plate 71 and the top plate 72, and a mounting plate 75 slidably disposed on the guiding slide bar 74. A rotating sleeve 12 that is rotationally matched with the mounting plate 75 is formed on the outer wall of the drill barrel 1. A through hole 711 for the drill barrel 1 to pass through is formed at the bottom of the bottom plate 71. The rotating mechanism 8 includes a first belt pulley 81 fixedly sleeved on the outer wall of the drill barrel 1, a second belt pulley 82 rotatably mounted on the mounting plate 75, a synchronous belt 83 sleeved on the first belt pulley 81 and the second belt pulley 82, and a first motor 84 for driving the second belt pulley 82 to rotate. The first motor 84 is fixedly mounted on the mounting plate 75, and the output shaft of the first motor 84 is in transmission connection with the second belt pulley 82. The adjusting mechanism 9 includes an adjusting screw rod 91 rotatably mounted on the bottom plate 71 and the top plate 72 and a second motor 92 for driving the adjusting screw rod 91 to rotate. The second motor 92 is fixedly mounted on the top plate 72, and the output shaft of the second motor 92 is in transmission connection with the adjusting screw rod 91. A threaded sleeve 751 that cooperates with the adjusting screw rod 91 is formed on the mounting plate 75. The rotating mechanism 8 and the adjusting mechanism 9 can be used to automatically drill the drill barrel 1, reduce labor intensity, and improve work efficiency.

[0039] In this embodiment, moving rollers 712 are provided at the bottom of the bottom plate 71, and a controller 721 is provided at the top of the top plate 72. The device can be easily moved to the detection location through the moving rollers 712.

[0040] The usage method of the present invention is as follows: First, move the device above the detection location, then adjust the initial height of the pressing plate 31 through the threaded adjustment column 34 according to the required detection depth. Then, turn on the first motor 84 and the second motor 92. Drive the drill barrel 1 to rotate through the rotating mechanism 8, drive the drill barrel 1 to drill down through the adjusting mechanism 9, so that the soil enters the drill barrel 1. At the same time, the pressing plate 31 will gradually compact the soil entering the drill barrel 1. When the drill barrel 1 reaches the specified depth, turn off the first motor 84 and the second motor 92. Finally, press the ejector rod 431 to simultaneously push multiple detection probes 41 into the soil through the driving head 432 for detection.

[0041] The above provides a detailed introduction to a soil humidity detection device for evaluating the water requirement of crop irrigation provided by the present invention. The description of the specific embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A soil moisture detection device for evaluating the water requirement of crop irrigation, characterized in that: It includes a drill pipe (1), a stone removal mechanism (2) located inside the drill pipe (1), a soil compaction mechanism (3), and a humidity detection mechanism (4); the stone removal mechanism (2) includes a plurality of rotary cutting blades (21) arranged in a circular array, a mounting ring (22) coaxially arranged with the drill pipe (1), and a center head (23). The rotary cutting blades (21) are fixedly connected to the mounting ring (22) and the center head (23), and the rotary cutting blades (21) are inclined; the mounting ring (22) is fixedly connected to the inner wall of the drill pipe (1) by bolts (5); the soil compaction mechanism (3) includes a pressing plate (31), a bearing plate (32), and a top spring (33). The pressing plate (31) is located below the bearing plate (32). The upper end of the top spring (33) is fixedly connected to the bottom of the bearing plate (32), and the lower end is fixedly connected to the top of the pressing plate (31); the humidity detection mechanism (4) includes a plurality of detection probes (41), a mounting pipe (42) for mounting the detection probes (41), and a driving component (43) for driving the detection probes (41) to extend out of the mounting pipe (42) and into the soil. The plurality of detection probes (41) are arranged in a circular array with the axis of the mounting pipe (42) as the center line. Mounting holes (421) for mounting the detection probes are formed on the side wall of the mounting pipe (42). The detection probes (41) are slidably matched with the mounting holes (421); the bottom end of the mounting pipe (42) is rotatably connected to the center head (23), and the top end passes through the top of the drill pipe (1); through holes for the mounting pipe (42) to pass through are formed on both the pressing plate (31) and the bearing plate (32); the detection probes (41) are located between the rotary cutting blades (21) and the pressing plate (31).

2. The soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 1, characterized in that: The angle between the rotary cutting blade (21) and the horizontal plane is 30° - 45°; the stone removal mechanism (2) further includes at least one annular blade (24) coaxially arranged with the mounting ring (22), and the feeding direction of the annular blade (24) is perpendicular to the horizontal plane.

3. The soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 2, characterized in that: It includes a filter screen (6). The filter screen (6) has a fixed ring (61) fixedly connected to the mounting pipe (42) and a rotating ring (62) rotatably matched with the inner wall of the drill pipe (1). The fixed ring (61) and the rotating ring (62) are both coaxially arranged with the drill pipe (1).

4. A soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 1, characterized in that: The driving assembly (43) includes a push rod (431), a driving head (432) located at the bottom end of the push rod (431), a first return spring (433) for resetting the push rod (431), and a second return spring (434) for resetting the detection probe (41); the driving head (432) is frustum-shaped, and the diameter of the driving head (432) gradually decreases from top to bottom; the detection probe (41) has a contact portion (411) that slidably contacts the driving head (432), a detection portion (412) that contacts the soil, and a sliding portion (413) that slidably contacts the mounting hole (421). A top plate (414) is provided on the sliding portion (413). The second return spring (434) is sleeved on the sliding portion (413), and one end of the second return spring (434) contacts the inner wall of the mounting tube (42) and the other end contacts the top plate (414).

5. The soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 4, characterized in that: A plurality of guide grooves (4321) that are slidably matched with the contact portion (411) are further formed on the side wall of the driving head (432).

6. The soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 5, wherein: The first return spring (433) is located below the driving head (432) and is coaxially arranged with the mounting tube (42); a connecting plate (4322) is formed at the bottom of the driving head (432), and the first return spring (433) is fixedly connected to the bottom of the connecting plate (4322).

7. A soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 1, characterized in that: The soil compaction mechanism (3) further includes a threaded adjustment column (34). A threaded connection sleeve (11) that is threadedly matched with the threaded adjustment column (34) is provided at the top of the drill barrel (1); the bottom of the threaded adjustment column (34) is rotatably connected to the bearing plate (32), a control knob (341) is formed at the top of the threaded adjustment column (34), and the threaded adjustment column (34) is rotatably matched with the mounting tube (42).

8. A soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 1, characterized in that: It further includes a mounting frame (7), and a rotating mechanism (8) for driving the drill cylinder (1) to rotate and an adjusting mechanism (9) for driving the drill cylinder (1) to move up and down are also provided on the mounting frame (7); the mounting frame (7) includes a bottom plate 71, a top plate (72), support rods (73) supported between the bottom plate (71) and the top plate (72), a guide slide rod (74) fixedly connected between the bottom plate (71) and the top plate (72), and a mounting plate (75) slidably disposed on the guide slide rod (74); a rotating sleeve (12) rotatably engaged with the mounting plate (75) is formed on the outer wall of the drill cylinder (1); a through hole (711) for the drill cylinder (1) to pass through is formed at the bottom of the bottom plate (71); the rotating mechanism (8) includes a first pulley (81) fixedly sleeved on the outer wall of the drill cylinder (1), a second pulley (82) rotatably mounted on the mounting plate (75), a synchronous belt (83) sleeved on the first pulley (81) and the second pulley (82), and a first motor (84) for driving the second pulley (82) to rotate; the adjusting mechanism (9) includes an adjusting screw rod (91) rotatably mounted on the bottom plate (71) and the top plate (72) and a second motor (92) for driving the adjusting screw rod (91) to rotate, and a threaded sleeve (751) engaged with the adjusting screw rod (91) is formed on the mounting plate (75).

9. The soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 8, characterized in that: A plurality of saw teeth (13) are formed at the bottom of the drill cylinder (1).

10. A soil moisture detection device for evaluating the water requirement of crop irrigation according to claim 9, characterized in that: Moving rollers (712) are provided at the bottom of the bottom plate (71), and a controller (721) is provided at the top of the top plate (72).

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