A crop plant height measuring device

Abstract

The utility model discloses a kind of crop plant height measuring devices, the device has telescopic rod that can be telescopic in sleeve, and the clamping mechanism of variable number and location, so that device can measure the height of higher large crop plant, so device has greater measurement range, can adapt to the measurement of different height plant. The unique internal structure of clamping mechanism makes it only press push rod to simultaneously realize two actions of being separated from mounting groove and loosening the plant being clamped, facilitates measurement operation, greatly improves the efficiency of measurement work. There are also multiple positioning mechanisms in the device, each positioning mechanism has at least one horizontally extendable plugboard so that the device can be more firmly fixed to the ground, avoiding the device from being accidentally bumped to cause tilt and thus affecting the accuracy of measurement results. In addition, the device is equipped with a bubble level, and the operator can first ensure the device is level through the bubble level to ensure the accuracy of the measurement results.

Description

Technical Field

[0001] This utility model belongs to the field of crop measurement technology, specifically relating to a crop plant height measuring device. Background Technology

[0002] Crop plant height refers to the distance between the highest point of a crop plant in its extended state and the ground. This parameter is an important indicator for assessing crop growth, population structure, and potential yield. Traditional methods of measuring crop plant height involve a person using a measuring tape to directly measure the plant. Due to the natural bending and drooping nature of plants, manual measurement is time-consuming, labor-intensive, and prone to errors. Furthermore, manual measurement is susceptible to damage due to careless handling. To address this, agricultural technicians have developed devices for measuring crop plant height. For example, Chinese Patent Application No. 202321954367.8, entitled "A Crop Plant Height Measuring Device," discloses a device with a clamping block and a conical positioning block at the bottom. This device contains an automatically retractable measuring tape. To measure, the device is first inserted into the ground, and the clamping block holds the plant upright. Then, the measuring tape is pulled out to measure the plant. This device reduces the complexity of measurement work and makes the measurement results more accurate, but it also has some shortcomings. First, the position of the clamping block in the device is fixed. When dealing with taller plants, the clamping block can only be clamped near the base of the plant, making it impossible to keep the plant upright. Second, the device only has one conical positioning block, which is easily knocked off course after being inserted into the soil, thus affecting the measurement results. Furthermore, the height of crops needs to be measured vertically, but this device cannot guarantee horizontal placement, which also affects the accuracy of the measurement results. The existence of these defects makes it difficult to measure the height of plants, so it is necessary to develop a new device for measuring the height of crops. Utility Model Content

[0003] The purpose of this invention is to provide a crop plant height measuring device that simplifies the crop plant height measurement process while ensuring the accuracy of the measurement results, thereby improving the efficiency of crop plant height measurement and the reference value of the results.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A crop plant height measuring device includes a base plate, a sleeve, a telescopic rod, a clamping mechanism, and a positioning mechanism. The sleeve is a straight cylinder with its lower end fixedly connected to the upper surface of the base plate and its upper end having an opening. The sleeve is perpendicular to the base plate. A mounting groove for the clamping mechanism is provided on the side of the sleeve; the mounting groove is strip-shaped and extends along the height direction of the sleeve. The surface of the sleeve has graduations distributed along its height direction. The clamping mechanism includes a cover and clamping components. With the direction closest to the sleeve as the front, the front half of the cover is housed in the mounting groove, and the rear half is outside the mounting groove. The mounting slot can accommodate one or more covers at the same time, and the relative position of each cover to the mounting slot can be changed; a strip-shaped opening is provided at the rear end of the cover, the front half of the two clamping members is accommodated in the cover, and the rear half extends out of the cover through the strip-shaped opening. The rear half of the two clamping members can clamp the crop plant, and the clamped plant extends in the vertical direction; the telescopic rod is a straight rod, the lower half of which is inserted into the sleeve, and the upper half extends out of the sleeve through the opening. The telescopic rod can slide in the vertical direction, and the surface of the telescopic rod also has scales distributed along the height direction.

[0006] In existing technologies, crop height measuring devices often lack clamping mechanisms for fixing the plants, or if they do, the height is fixed, making them unsuitable for measuring plants of varying heights. This invention features a height-adjustable clamping mechanism, and the number of clamping mechanisms can be increased or decreased as needed, ensuring that crops of different heights are always fully extended during measurement. The device also includes an upward-extending telescopic rod to accommodate measurements of taller plants.

[0007] Further optimization includes a positioning mechanism, which in turn comprises a housing and an insert plate. The upper end of the housing is fixedly connected to the lower surface of the base plate, and the lower end is tapered. The housing has an insertion port through which the insert plate can extend or retract. The insert plate is parallel to the base plate. Multiple positioning mechanisms are included in the same device. The presence of the positioning mechanism allows the device to stand more firmly on the ground, reducing the possibility of tilting due to unexpected factors and helping to ensure the accuracy of the measurement results.

[0008] Further optimization involves drilling multiple mounting holes in the mounting slot. All mounting holes are the same size and shape, and are equidistantly distributed along the height direction on the left and right side walls of the mounting slot. For any mounting hole on the left side wall, there is a mounting hole on the right side wall at the same height. The clamping mechanism includes two insert blocks, with one insertion hole on each of the left and right sides of the cover. The two insert blocks are divided into left and right insert blocks, which can extend or retract from the left and right insertion holes, respectively. The insert blocks can be inserted into the mounting holes. When the two insert blocks in the same clamping mechanism are inserted into the two mounting holes at the same height, the relative position of the clamping mechanism and the mounting slot is fixed. By creating mounting holes in the mounting slot and allowing the insert blocks in the clamping mechanism to be inserted into the mounting holes, the position of the clamping mechanism in the mounting slot can be fixed, and it can be removed when not needed. Multiple clamping mechanisms can also be added as needed.

[0009] Further optimization involves housing a first guide rod, two limiting plates, and two springs within the enclosure. The limiting plates are strip-shaped and extend in the front-to-back direction. The front ends of the two limiting plates are fixedly connected to the left and right inserts, respectively. Each limiting plate has a first through hole for the first guide rod to pass through. The first guide rod extends in the left-to-right direction, with both ends abutting against the inner surface of the enclosure. Both springs are sleeved on the first guide rod. One spring has its left end fixedly connected to the inner surface of the enclosure and its right end fixedly connected to the left limiting plate. The other spring has its left end fixedly connected to the right limiting plate. The right end is fixedly connected to the inner surface of the cover. When the two inserts extend out of the insertion holes, both springs are in their natural state. There is a through hole on both the left and right sides of the cover. A push rod is inserted through each of the two through holes. Both push rods extend in the left and right directions. The right half of the push rod on the left is housed in the cover and its right end abuts against the left limiting plate. The left half extends out of the cover. The left half of the push rod on the right is housed in the cover and its left end abuts against the right limiting plate. The right half extends out of the cover. A first slider is fixedly installed at the rear end of each of the two limiting plates.

[0010] The enclosure also houses a central block, which is a flattened prism with its height parallel to the vertical direction. The base of the central block is axially symmetric, with its axis of symmetry parallel to the front-back direction. The front end of the central block has two planes, and the edges of these two front planes that meet the same base are axially symmetric about the base. The central block has a first slide rail, which is divided into two segments. These two segments are located on the two front planes, respectively. The lines containing both slide rails are parallel to the horizontal plane, and their intersection point is located in front of the central block. Two first sliders are positioned within the two first slide rail segments, allowing them to slide within the first slide rails but preventing them from detaching. The front halves of both clamping members are drilled with holes for inserting second guide rods. The second perforation and the second guide rod are housed within the cover and extend in the left-right direction. Both ends of the second guide rod are fixedly connected to the inner surface of the cover. Each of the two clamping parts is equipped with a second slider at its front end. The rear end of the center block also has two planes, and the edges of the two rear planes that connect with the same bottom surface are symmetrical about the bottom surface. The center block also has a second slide rail, which is divided into two sections. The two slide rail sections are located on the two rear planes respectively. The straight lines of the two slide rail sections are parallel to the horizontal plane, and the intersection of the straight lines is located behind the center block. The two second sliders are located in the two sections of the second slide rail respectively. The second sliders can slide in the second slide rail but cannot disengage from the second slide rail. The center block can move in the front-back direction within the cover.

[0011] The aforementioned internal structure allows the clamping mechanism to retract the left and right inserts into the housing while simultaneously opening the two clamping members when the push rod is pressed down. With the inserts retracted, the clamping mechanism can be removed from the mounting slot, and the two clamping members open. If a crop plant is being held in the clamping mechanism, it will release, allowing the next plant to be tested to be placed between the bent sections of the two clamping members. The clamping mechanism is then placed back into the corresponding position in the mounting slot, and the push rod is released. Under the action of the spring, the inserts will pop out of the housing, and the clamping members will clamp the plant, thus securing it in place. This design, where the inserts retract when the push rod is pressed down and the clamping members release simultaneously, simplifies the operation of the device, greatly facilitating the operator and improving the efficiency of measurement work.

[0012] Further optimization includes a threaded rod and a baffle in the positioning mechanism. The upper end of the housing is open, a third through hole is drilled in the bottom plate, and a fourth through hole is drilled in the baffle. The threaded rod is perpendicular to the bottom plate, with its lower half housed in the housing and its upper half extending from the upper surface of the bottom plate through the opening and the third through hole. The baffle is housed in the housing and can only move vertically. The lower half of the threaded rod passes through the fourth through hole, which is a bearing connection between the third through hole and the upper half of the threaded rod. The fourth through hole is a threaded hole adapted to the lower half of the threaded rod. The housing also houses two connecting parts, a sliding rod, and a movable block. The upper ends of the connecting parts are fixedly connected to the lower surface of the baffle. The sliding rod extends horizontally, with its two ends fixedly connected to the two connecting parts respectively. A strip-shaped hole is provided in the movable block. A strip-shaped hole penetrates the movable block, and the opening of the hole is strip-shaped. The movable block is fixedly connected to the insert plate. Taking the side connected to the insert plate as the front side of the movable block, both the left and right sides of the movable block are planes parallel to the vertical direction, and the left and right planes are also parallel to each other. The openings of the two strip-shaped holes are located on the left and right planes respectively. The height of the front end of the opening is lower than that of the rear end. The slide rod is inserted into the strip-shaped hole, and the length of the slide rod is equal to the distance between the left and right planes. The slide rod can move back and forth in the strip-shaped hole to drive the movable block to move back and forth. The upper and lower sides of the movable block are both planes parallel to the horizontal plane. The housing also houses a limiting member. The limiting member is fixed in position relative to the housing. Throughout the entire stroke range of the movable block, the limiting member always remains in contact with the upper and lower planes of the movable block.

[0013] The positioning mechanism uses insert plates inserted laterally into the soil to achieve overall fixation of the device. The aforementioned internal structure allows the insert plates to extend and retract manually. By rotating the screw, the baffle moves upward or downward, causing the connecting parts and sliding rod to move synchronously with the baffle. Because the movable block can only move laterally, its movement is achieved by the sliding rod pressing against it, allowing the insert plate to extend or retract from the housing. It should be noted that a positioning mechanism can also have multiple insert plates, which can extend in different directions; the more insert plates, the higher the stability of the device.

[0014] Further optimization involves fixing a bubble level to the upper surface of the base plate; a top plate is fixedly connected to the upper end of the telescopic rod, and the top plate is parallel to the base plate. A bubble level is a common component used to help operators calibrate the levelness. The presence of a bubble level ensures the device is level when inserted into the soil, preventing measurement errors caused by tilting. The top plate ensures accuracy when measuring taller plants. If the plant tip touches the lower surface of the top plate, the plant is fully extended, resulting in an accurate measurement. If the plant tip does not touch the top plate when it is at its lowest position, the plant is still small; in this case, the plant can be directly placed against the sleeve for height measurement without clamping. Besides assisting in measurement, the top plate also serves as a handle for easy extension and insertion of the telescopic rod.

[0015] The beneficial effects of this utility model device are as follows:

[0016] 1. The position and number of clamping mechanisms in this utility model device can be changed, and even for relatively tall plants, they can be fully extended, so that the device can adapt to various measurement needs;

[0017] 2. The device is equipped with a bubble level, which allows the operator to determine that the device is in a horizontal position, thus ensuring the accuracy of the measurement results;

[0018] 3. The device has multiple positioning mechanisms, and each positioning mechanism has an extendable insert plate, which allows the device to be better fixed relative to the ground.

[0019] 4. The unique internal structure of the clamping mechanism allows it to simultaneously detach from the mounting slot and release the clamped plant by simply pressing the push rod, which facilitates measurement operations and greatly improves the efficiency of measurement work. Attached Figure Description

[0020] Figure 1 Overall appearance diagram of the device of this utility model;

[0021] Figure 2 A schematic diagram of the internal structure of the clamping structure excluding the clamping plate;

[0022] Figure 3 A schematic diagram of the complete internal structure of the clamping structure;

[0023] Figure 4 Overall appearance diagram of the positioning mechanism;

[0024] Figure 5 A schematic diagram showing the distribution of the main components inside the positioning mechanism. Detailed Implementation

[0025] Example

[0026] A crop plant height measuring device includes a base plate 1, a sleeve 2, a telescopic rod 3, a clamping mechanism 5, a positioning mechanism 6, and a spirit level 7. The sleeve 2 is a straight cylinder, its lower end fixedly connected to the upper surface of the base plate 1, and its upper end has an opening. The sleeve 2 is perpendicular to the base plate 1. A mounting groove 51 for mounting the clamping mechanism 5 is formed on the side of the sleeve 2. The mounting groove 51 is strip-shaped and extends along the height direction of the sleeve 2. The surface of the sleeve 2 has graduations distributed along its height direction. Multiple mounting holes are drilled in the mounting groove 51. All mounting holes are the same size and shape and are equidistantly distributed along the height direction on the left and right radial walls of the mounting groove 51. For any mounting hole located on the left wall, there is a mounting hole on the right wall at the same height. The telescopic rod 3 is a straight rod, with its lower half inserted into the sleeve 2 and its upper half extending out of the sleeve 2 through the opening. The upper end of the telescopic rod 3 is fixedly connected to a top plate 4, which is rectangular and parallel to the bottom plate 1. The telescopic rod 3 can slide and rotate in the vertical direction, and the surface of the telescopic rod 3 also has scales distributed along the height direction.

[0027] The clamping mechanism 5 includes a cover 52, a clamping member 574, and two inserts. With the direction closest to the sleeve 2 as the front, the front half of the cover 52 is housed in the mounting groove 51, and the rear half is outside the mounting groove 51. There is an insertion hole on each of the left and right sides of the cover 52. The two inserts are divided into left and right inserts. The left and right inserts can be partially extended or completely retracted from the left and right insertion holes, respectively. The inserts can be inserted into the mounting holes. When the two inserts in the same clamping mechanism 5 are inserted into the two mounting holes at the same height, the relative position of the clamping mechanism 5 and the mounting groove 51 is fixed. In this embodiment, there is only one clamping mechanism 5. The rear end of the cover 52 has a strip-shaped opening. The front half of the two clamping members 574 is housed inside the cover 52, and the rear half extends out of the cover 52 through the strip-shaped opening. The rear half of each clamping member 574 contains a crescent-shaped bent rod. The two bent rods are on the left and right, and are identical in shape and size. The left bent rod protrudes to the left, and the right bent rod protrudes to the right. The distance between the two bent rods is adjustable.

[0028] The clamping mechanism 5 also includes a first guide rod 53, two limiting plates 54, and two springs 55. The limiting plates 54 are strip-shaped and extend in the front-back direction. The front ends of the two limiting plates 54 are fixedly connected to the left and right inserts, respectively. Each limiting plate 54 has a first through hole for the first guide rod 53 to pass through. The first guide rod 53 extends in the left-right direction, and both ends of it abut against the inner surface of the cover 52. The two springs 55 are both sleeved on the first guide rod 53. The left end of one spring 55 is fixedly connected to the inner surface of the cover 52, and the right end is fixedly connected to the limiting plate 54 located on the left side. The left end of the other spring 55 is fixedly connected to the limiting plate 54 located on the right side, and the right end is fixedly connected to the inner surface of the cover 52. When the two inserts extend out of the insertion holes, both springs 55 are in their natural state. A through hole is opened on both the left and right sides of the cover 52, and a push rod 56 is inserted through each through hole. Both push rods 56 extend in the left and right direction. The right half of the push rod 56 on the left is housed inside the cover 52 and its right end abuts against the limiting plate 54 on the left side, while the left half extends out of the cover 52. The left half of the push rod 56 on the right is housed inside the cover 52 and its left end abuts against the limiting plate 54 on the right side, while the right half extends out of the cover 52. A press plate is fixedly installed at the left end of the left push rod 56 and the right end of the right push rod 56. A first slider 571 is fixedly installed at the rear end of each of the two limiting plates 54. The above structure is as follows. Figure 2 As shown.

[0029] The enclosure 52 also houses a central block 572, which is a flat hexagonal prism with its height direction parallel to the vertical direction. The bottom surface of the central block 572 is an axisymmetric figure, with its axis of symmetry parallel to the front-back direction. A plane perpendicular to the left-right direction is defined as the plane of symmetry of the central block 572, denoted as plane P. The central block 572 has a first slide rail, which is divided into two segments. Both segments are located at the front end of the central block 572 and are symmetrical about plane P. The lines containing both slide rails are parallel to the horizontal plane, and their intersection point is located in front of the central block 572. Two first sliders 571 are respectively located within the two segments of the first slide rail. The first sliders 571 can slide within the first slide rails but cannot detach from them. The front halves of both clamping members 574 are drilled with useful... A second through hole is provided for the second guide rod 573, which is housed in the cover 52 and extends in the left-right direction. Both ends of the second guide rod 573 are fixedly connected to the inner surface of the cover 52. A second slider 575 is installed at the front end of each of the two clamping members 574. The center block 572 also has a second slide rail, which is divided into two sections. Both sections are located at the rear end of the center block 572 and are symmetrical about plane P. The straight lines of the two sections are parallel to the horizontal plane and their intersection point is located behind the center block 572. The two second sliders 575 are respectively located in the two sections of the second slide rail. The second sliders 575 can slide in the second slide rail but cannot disengage from it. The center block 572 can move in the front-back direction within the cover 52. The overall structure of the clamping mechanism 5 is as follows. Figure 3 As shown.

[0030] When the push plate on the two push rods 56 is pressed, the push rods 56 will push the two limiting plates 54 towards the center, and the two springs 55 will be in a stretched state. The two inserts will retract into the insertion holes. At the same time, the first slider 571 at the rear end of the limiting plate 54 will push the whole structure formed by the two clamping plates 572 backward. Since the two clamping parts 574 cannot move back and forth, the two clamping parts 574 will move to the left and right sides respectively under the push of the whole structure formed by the two clamping plates 572. At this time, the distance between the two clamping parts 574, that is, the two bent rods, will increase. If there are crop plants between the bent rods, they will be released at this time. By holding down the push plate, the operator can put the next crop plant to be tested between the two bent rods. Then, by releasing the push plate, the entire clamping mechanism 5 will return to its original state under the pull of the spring 55.

[0031] The positioning mechanism 6 includes a housing 61 and an insert plate 67. The upper end of the housing 61 is fixedly connected to the lower surface of the base plate 1, and the lower end is tapered. An insertion port is provided on the housing 61, through which the insert plate 67 can extend out of or retract into the housing 61. The end of the insert plate 67 extending out of the housing 61 has a pointed angle, and the insert plate 67 is parallel to the base plate 1. In this embodiment, the device includes two positioning mechanisms 6, located on the left and right sides of the clamping mechanism 5, respectively. The spirit level 7 is fixedly mounted on the upper surface of the base plate 1. The overall appearance and structure of this utility model device are as follows. Figure 1 As shown.

[0032] The specific structure of the positioning mechanism 6 is as follows: the housing 61 also includes a threaded rod 62 and a baffle 63. The upper end of the housing 61 is open. The overall appearance of the positioning mechanism 6 is as follows: Figure 4As shown. A third through hole is drilled in the base plate 1, and a fourth through hole is drilled in the baffle 63. The threaded rod 62 is perpendicular to the base plate 1, with its lower half housed in the housing 61 and its upper half extending from the upper surface of the base plate 1 through the opening and the third through hole. The upper half is a non-threaded portion, and a rotating block is fixedly mounted on its upper end. The baffle 63 is housed in the housing 61 and can only move in the vertical direction. The lower half of the threaded rod 62 passes through the fourth through hole. The third through hole and the threaded rod 62 are connected by a bearing, and the fourth through hole is a threaded hole adapted to the lower half of the threaded rod 62. When the rotating block is rotated clockwise, the threaded rod 62 rotates. Since the baffle 63 is threadedly connected to the threaded rod 62, and since 63 can only move vertically, the baffle 63 will move upward relative to the threaded rod 62. The housing 61 also houses two connecting members 64, a sliding rod 65, and a movable block 66. The connecting members 64 are rod-shaped and extend vertically, with their upper ends fixedly connected to the lower surface of the baffle 63. The sliding rod 65 extends horizontally, with its two ends fixedly connected to the lower ends of the two connecting members 64 respectively. A strip-shaped hole is formed in the movable block 66, penetrating the block and having a strip-shaped opening. The movable block 66 is fixedly connected to the insert plate 67. In this embodiment, the movable block 66 is a cuboid. The two openings of the strip-shaped hole are located on opposite sides of the movable block 66, and the strip-shaped holes are obliquely distributed within the block. The sliding rod 65 is inserted into the strip-shaped hole, and its length is slightly longer than the distance between the two planes where the openings are located. The sliding rod 65 can apply pressure to the wall of the strip-shaped hole to drive the movable block 66 to move. The moving distance of the movable block 66 is proportional to the moving distance of the baffle 63. The main components of the positioning mechanism 6 are distributed as follows: Figure 5 As shown. The housing 61 also houses limiting members, which in this embodiment are two horizontal plates. Figure 5 Not shown in the diagram, both horizontal plates are parallel to the horizontal plane but at different heights. The two horizontal plates are referred to as the upper horizontal plate and the lower horizontal plate, respectively. Both horizontal plates are fixed in relative position to the housing 61. Throughout the entire stroke range of the movable block 66, the upper horizontal plate and the lower horizontal plate always remain in contact with the upper and lower planes of the movable block 66.

[0033] When the insert plate 67 needs to extend out of the housing 61, simply rotate the screw block to continuously rotate the threaded rod 62 clockwise, causing the baffle 63 to move upward relative to the threaded rod 62. The sliding rod 65 will move upward synchronously with the connecting piece 64 and the baffle 63. At this time, the sliding rod 65 will exert a force on the upper wall of the slotted hole. Since the movable block 66 cannot move upward, but the sliding rod 65 can only move vertically, and the upper wall of the slotted hole is an inclined plane, the movable block 66 will move laterally towards the insertion hole under the action of the sliding rod 65, pushing the insert plate 67 out of the housing 61. When the insert plate 67 needs to retract into the housing 61, simply rotate the screw block counterclockwise, causing the sliding rod 65 to exert a force on the lower wall of the slotted hole. The movable block 66 will move away from the insertion hole, causing the insert plate 67 to retract.

[0034] Understandably, top plate 4 can also be omitted.

[0035] It is understandable that the structure for fixing the clamping mechanism 5 in the mounting slot 51 can also be other than opening mounting holes, and there can be two, three or more clamping mechanisms 5 in the mounting slot 51.

[0036] It is understandable that the device may contain more positioning mechanisms 6, and the positioning mechanism 6 may also have multiple insert plates 67 and their matching components.

[0037] It is understood that the connector 64, the movable block 66, and the limiting member in the positioning mechanism 6 can all be in other forms than those described in the embodiments.

[0038] It is understandable that the bubble level 7 can also be installed in other positions on the device, or the device may not have the bubble level 7 and the device may be leveled by other means or components.

[0039] It is understandable that the up-and-down movement of the baffle 63 in the positioning mechanism 6 can also be driven by other means. For example, the upper half of the threaded rod 62 is threaded, while the lower half is not. The third through hole is a threaded hole that matches the upper half of the threaded rod 62, and the fourth through hole is connected to the threaded rod 62 by a bearing. Alternatively, the entire threaded rod 62 is threaded, and both the third and fourth through holes are threaded holes that match the threaded rod 62, but the threads in the two holes rotate in opposite directions.

Claims

1. A device for measuring crop plant height, characterized in that: The device includes a base plate (1), a sleeve (2), a telescopic rod (3), and a clamping mechanism (5). The sleeve (2) is a straight cylinder with its lower end fixedly connected to the upper surface of the base plate (1) and its upper end having an opening. The sleeve (2) is perpendicular to the base plate (1). The side of the sleeve (2) has a mounting groove (51) for mounting the clamping mechanism (5). The mounting groove (51) is strip-shaped and extends along the height direction of the sleeve (2). The surface of the sleeve (2) has scales distributed along its height direction. The clamping mechanism (5) includes a cover (52) and a clamping member (574). With the direction closest to the sleeve (2) as the front, the front half of the cover (52) is housed in the mounting groove (51), and the rear half is outside the mounting groove (51). The mounting slot (51) can simultaneously accommodate one or more covers (52), and the relative position of each cover (52) and the mounting slot (51) can be changed; the rear end of the cover (52) is provided with a strip-shaped opening, the front half of the two clamping members (574) is accommodated in the cover (52), and the rear half extends out of the cover (52) through the strip-shaped opening. The rear half of the two clamping members (574) can clamp the crop plant, and the clamped plant extends in the vertical direction; the telescopic rod (3) is a straight rod, the lower half of which is inserted into the sleeve (2), and the upper half extends out of the sleeve (2) through the opening. The telescopic rod (3) can slide in the vertical direction, and the surface of the telescopic rod (3) also has scales distributed in the height direction.

2. The crop plant height measuring device as described in claim 1, characterized in that: The device also includes a positioning mechanism (6), which in turn includes a housing (61) and a insert plate (67). The upper end of the housing (61) is fixedly connected to the lower surface of the base plate (1), and the lower end is tapered. The housing (61) has an opening, and the insert plate (67) can extend out of the housing (61) or retract into the housing (61) through the opening. The insert plate (67) is parallel to the base plate (1). The same device contains multiple positioning mechanisms (6).

3. The crop plant height measuring device as described in claim 2, characterized in that: Multiple mounting holes are drilled in the mounting groove (51). All mounting holes are the same size and shape and are equidistantly distributed along the height direction on the left and right side walls of the mounting groove (51). For any mounting hole on the left side wall, there is a mounting hole on the right side wall at the same height. The clamping mechanism (5) includes two inserts. Each side of the cover (52) has an insertion hole. The two inserts are divided into left and right inserts. The left and right inserts can be partially extended or completely retracted from the left and right insertion holes, respectively. The inserts can be inserted into the mounting holes. When the two inserts in the same clamping mechanism (5) are inserted into the two mounting holes at the same height, the relative position of the clamping mechanism (5) and the mounting groove (51) is fixed.

4. The crop plant height measuring device as described in claim 3, characterized in that: The cover (52) houses a first guide rod (53), two limiting plates (54), and two springs (55). The limiting plates (54) are strip-shaped and extend in the front-back direction. The front ends of the two limiting plates (54) are fixedly connected to the left and right inserts, respectively. Each limiting plate (54) has a first through hole for the first guide rod (53) to pass through. The first guide rod (53) extends in the left-right direction, and both ends of it abut against the inner surface of the cover (52). The two springs (55) are both sleeved on the first guide rod (53). The left end of one spring (55) is fixedly connected to the inner surface of the cover (52), and the right end is fixedly connected to the limiting plate (54) located on the left side. The left end of the other spring (55) is fixedly connected to the limiting plate (54) located on the right side. The right end is fixedly connected to the inner surface of the cover (52). When the two inserts extend out of the insertion holes, the two springs (55) are in the natural state. There is a through hole on both the left and right sides of the cover (52). A push rod (56) is inserted through each of the two through holes. The two push rods (56) extend in the left and right directions. The right half of the push rod (56) on the left is housed in the cover (52) and its right end abuts against the limiting plate (54) on the left. The left half extends out of the cover (52). The left half of the push rod (56) on the right is housed in the cover (52) and its left end abuts against the limiting plate (54) on the right. The right half extends out of the cover (52). A first slider (571) is fixedly installed at the rear end of each of the two limiting plates (54). The cover (52) also contains a central block (572), which is a flat prism with its height direction parallel to the vertical direction. The bottom surface of the central block (572) is an axisymmetric figure with its axis of symmetry parallel to the front and back directions. The front end of the central block (572) has two planes, and the edges of the two front planes that connect with the same bottom surface are symmetrical about the bottom plane. The central block (572) has a first slide rail, which is divided into two sections. The two slide rail sections are located on the two front planes respectively. The straight lines of the two slide rail sections are parallel to the horizontal plane and the intersection of the straight lines is located in front of the central block (572). The two first sliders (571) are located in the two sections of the first slide rail respectively. The first sliders (571) can slide in the first slide rail but cannot detach from the first slide rail. The front half of the two clamping members (574) is drilled with second through holes for the second guide rod (573) to pass through. The second guide rod (573) is housed in the cover (52) and extends in the left and right direction. Both ends of the second guide rod (573) are fixedly connected to the inner surface of the cover (52). Each of the two clamping parts (574) is equipped with a second slider (575) at its front end. The rear end of the center block (572) also has two planes. The edges of the two rear planes that connect with the same bottom surface are also symmetrical about the bottom surface. The center block (572) also has a second slide rail. The second slide rail is divided into two sections. The two slide rail sections are located on the two rear planes respectively. The straight lines of the two slide rail sections are parallel to the horizontal plane and the intersection of the straight lines is located behind the center block (572). The two second sliders (575) are located in the two sections of the second slide rail respectively. The second sliders (575) can slide in the second slide rail but cannot detach from the second slide rail. The center block (572) can move in the front and back direction in the cover (52).

5. The crop plant height measuring device as described in claim 4, characterized in that: The positioning mechanism (6) also includes a threaded rod (62) and a baffle (63). The upper end of the housing (61) is open, a third through hole is drilled on the bottom plate (1), and a fourth through hole is drilled on the baffle (63). The threaded rod (62) is perpendicular to the bottom plate (1), and its lower half is housed in the housing (61). Its upper half extends from the upper surface of the bottom plate (1) through the opening and the third through hole, and the upper half is a non-threaded part. The baffle (63) is housed in the housing (61), and the baffle (63) can and can only be positioned along the... Moving vertically, the lower half of the threaded rod (62) passes through the fourth through hole, and the third through hole is connected to the upper half of the threaded rod (62) by a bearing. The fourth through hole is a threaded hole that matches the lower half of the threaded rod (62). The housing (61) also contains two connecting parts (64), a sliding rod (65), and a movable block (66). The upper ends of the connecting parts (64) are fixedly connected to the lower surface of the baffle (63). The sliding rod (65) extends horizontally, and its two ends are fixed to the two connecting parts (64) respectively. The movable block (66) is connected to a strip-shaped hole that passes through the movable block (66) and has a strip-shaped opening. The movable block (66) is fixedly connected to the insert plate (67). Taking the side of the insert plate (67) as the front side of the movable block (66), the left and right sides of the movable block (66) are both planes parallel to the vertical direction, and the left and right planes are also parallel to each other. The openings of the two strip-shaped holes are located on the left and right planes respectively. The height of the front end of the opening is lower than that of the rear end. The slide rod (65) is inserted into the strip-shaped hole and the length of the slide rod (65) is equal to the distance between the left and right planes. The slide rod (65) can move back and forth in the strip-shaped hole to drive the movable block (66) to move back and forth. The upper and lower sides of the movable block (66) are both planes parallel to the horizontal plane. The housing (61) also contains a limiting member. The limiting member is fixed in relative position to the housing (61). The limiting member always keeps in contact with the upper and lower planes of the movable block (66) throughout the entire stroke range of the movable block (66).

6. The crop plant height measuring device as described in claim 5, characterized in that: A spirit level (7) is fixedly installed on the upper surface of the base plate (1); a top plate (4) is fixedly connected to the upper end of the telescopic rod (3), and the top plate (4) is parallel to the base plate (1).

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