A device for detecting the bending resistance of a millet plant stem

Abstract

The utility model provides a kind of millet plant stem diameter bending resistance detection device, including base, slidable support mechanism, base includes H type base, slidable support mechanism includes two first sliding rods, two first sliding rods are fixedly connected with support box between, pull assembly is installed in support box, pull assembly includes pull plate, first rotatable buckling cylinder is fixedly arranged in pull plate front side, two second sliding rods are equipped with in two first sliding rods top, the top of two second sliding rods is fixedly connected by connecting rod, second rotatable buckling cylinder is installed in the front side center of connecting rod;The central front side of H type base is equipped with third rotatable buckling cylinder;When first rotatable buckling cylinder, second rotatable buckling cylinder, third rotatable buckling cylinder are in buckling state, the plan view projection of three is corresponding;By above setting, when millet plant stem diameter bending resistance is detected, it has the advantages of stable and reliable, widely applicable, simple operation.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural testing instruments, specifically relating to a device for testing the bending resistance of millet plant stem diameter. Background Technology

[0002] The bending resistance of millet stalks is a key characteristic ensuring its growth and yield: strong bending resistance effectively resists lodging caused by wind and rain, preventing nutrient transport interruption after stalk breakage, moldy ears on the ground, or damage from pests and diseases, thus reducing the risk of yield reduction; especially during the millet grain-filling stage when the ears are increasing in weight, a stable stalk diameter can support the plant to maintain upright growth, ensuring normal photosynthesis and contributing to full grain filling; conducting tests on the bending resistance of millet stalks can differentiate the differences in bending resistance among varieties, providing data support for selecting lodging-resistant varieties; and it provides a targeted direction for breeding, helping to cultivate high-yielding varieties resistant to bending.

[0003] In the field of agricultural testing instruments, a utility model patent with patent document publication number CN210639010U and title "A device for testing the bending resistance of rice stems" discloses a testing scheme that uses a support frame, a testing device, and a soft strap. During the test, the soft strap is placed on the rice plant, and the testing device is pulled to slide along an arc-shaped track. When the rice plant breaks, the magnitude of the tensile force is read to determine the bending resistance.

[0004] The technical solution described in this patent document can measure the flexural strength of crop stems, but it has the following problems: 1. The combination of the support frame and the soft band can only be used for testing rice plants growing in the field, and it is difficult to adapt to stems that have been pulled up in the laboratory, thus limiting its applicability; 2. The operation and measurement accuracy are insufficient. It measures by placing the plant under the soft band, without setting a uniform fixed structure and measurement starting point. The tightness and position of the soft band are prone to deviation, and the sliding path of the arc-shaped slide does not accurately correspond to the fixed position of the plant. This makes it impossible to ensure that the stem is in a stable baseline state in the initial stage of measurement. There are many variables during the measurement process, resulting in poor consistency and comparability of the final test data, which is difficult to meet the high-precision requirements for crop stem flexural strength testing; 3. When the soft band is placed on the plant stem diameter for measurement, the top of the plant is prone to falling out of the soft band after the stem diameter deforms, which is not conducive to the measurement progress. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a device for testing the bending resistance of millet plant stalks.

[0006] The technical solution adopted by this utility model is: a millet plant stem diameter bending resistance testing device, including a base, the base including an H-shaped base, two sliding cylinders symmetrically distributed along the width direction are provided above the H-shaped base, and a slidable support mechanism is assembled above the sliding cylinders; the slidable support mechanism includes two first sliding rods, the two first sliding rods respectively form a matching sliding fit with the two sliding cylinders in the two sliding cylinders, and a support box is fixedly connected between the two first sliding rods. A tension component is installed in the support box, the tension component includes a pull plate, a first rotatable fastening cylinder is fixedly provided on the front side of the pull plate, the front side of the first rotatable fastening cylinder extends forward, and through holes are opened at the left and right ends of the extended part, and a force measuring pull ring is provided in the through hole; The upper surfaces of the two first sliding rods are provided with sliding holes, and two second sliding rods are provided above the two first sliding rods. The two second sliding rods are respectively adapted to slide with the sliding holes on the two first sliding rods. The top ends of the two second sliding rods are fixedly connected by a connecting rod, and a second rotatable fastening cylinder is installed in the center of the front side of the connecting rod. A third rotatable locking cylinder is installed on the central front side of the H-shaped base; When the first rotatable locking cylinder, the second rotatable locking cylinder, and the third rotatable locking cylinder are in the locked state, their top-view projections correspond to each other.

[0007] The tension assembly also includes a mounting box and a tension spring. The mounting box is fixedly installed inside the support box. A groove is formed in the middle of the width direction of the upper surface of the mounting box along its own length direction. A fixing ring is provided on the rear side wall of the groove inside the mounting box. A pull plate that can move along the length direction of the groove is provided on the front side of the groove. A connecting ring is installed on the rear end face of the pull plate. The tension spring hook at one end of the tension spring is sleeved on the fixing ring, and the tension spring hook at the other end of the tension spring is sleeved on the connecting ring.

[0008] The front end face of the mounting box is provided with a rectangular sliding groove that communicates with the groove, and the pull plate can move along its length within the rectangular sliding groove.

[0009] The inner edge of the middle part behind the pull plate extends upward to form a reading pointer, and the left and right sides behind the pull plate extend to the left and right respectively to form two limiting blocks with the same structure but opposite directions.

[0010] The width of the front side of the rectangular slide is smaller than the width of the rest, so that the front wall of the rectangular slide inside the mounting box forms a limiting surface; when the pull plate moves to the preset position, the limiting block abuts against the limiting surface, preventing the pull plate from moving further.

[0011] A snap-on dustproof reading cover is installed above the groove. The upper surface of the snap-on dustproof reading cover has a notch, and the reading pointer can move along the length of the notch. A first scale line is provided on the upper end surface of the snap-on dustproof reading cover and on one side corresponding to the notch.

[0012] The two first sliding rods have 2-8 threaded holes evenly spaced vertically on the front side of their lower half, and through holes are provided on the front side of the upper part of the two sliding cylinders. Bolts can be inserted through the through holes into the threaded holes to restrict the sliding of the first sliding rods. The two second sliding rods have 2-8 threaded holes evenly spaced vertically on their front side, and through holes are provided on the front side of the upper part of the two first sliding rods. Bolts can be inserted through the through holes into the threaded holes to restrict the sliding of the second sliding rods.

[0013] The first rotatable fastening cylinder includes a left half-cylindrical structure and a right half-cylindrical structure. The left half-cylindrical structure has a rotating column on the front side and a fastening groove on the rear side. The right half-cylindrical structure has a rotating cylinder on the front side that rotates in conjunction with the rotating column and a fastening tooth on the rear side that can be adapted to fasten with the fastening groove. The rear side of the left half-cylindrical structure extends rearward and is fixed to the front end face of the pull plate. When the first rotatable fastening cylinder is in the fastening state, the fastening tooth of the right half-cylindrical structure is fastened in the fastening groove.

[0014] Both the second and third rotatable fastening cylinders include a left half-cylindrical structure and a right half-cylindrical structure, and the inner middle part of the left half-cylindrical structure and the right half-cylindrical structure of the second and third rotatable fastening cylinders is provided with an inwardly protruding spike.

[0015] One side of the upper surface of the H-shaped base is provided with a second scale line extending along the length of the H-shaped base.

[0016] Beneficial effects: 1. By setting up an H-shaped base and a first, second, and third rotatable locking cylinder, measurements can be taken in the laboratory by fixing the two ends of the uprooted stem with the second and third rotatable locking cylinders and placing the middle of the stem inside the first rotatable locking cylinder. In the field, the stem not being measured can pass through the gaps between the H-shaped bases, avoiding interference with the detection. This breaks the limitation of the comparative document being only applicable to field-grown plants, effectively solving the problem of its single applicable scenario; 2. By designing the first rotatable locking cylinder, When the second and third rotatable locking cylinders are in the locked state, their top-view projections correspond to each other. This structure, combined with the locking cylinders' function of fixing the stem, replaces the soft strap placement method used in the reference document. It not only avoids the problem of the plant tip detaching from the soft strap after stem diameter deformation, ensuring measurement progress, but also ensures the stem remains stable within the three locking cylinders and vertically upright during the initial measurement stage. This solves the shortcomings of the reference document, such as the lack of a unified starting point, easy deviation in the tightness and position of the soft strap, and unstable stem baseline state. It reduces variables in the measurement process, making the testing conditions more consistent for different measurements and different plants. 1. Unified and significantly improved consistency and comparability of test data, meeting the high-precision testing requirements for millet plant stalk diameter bending resistance; 2. The device adopts a structure design without any electronic components, eliminating the need for batteries or other electronic components, making it more stable and reliable in agricultural scientific measurements. Furthermore, operation in both laboratory and field measurement scenarios requires no complex assembly and debugging, further enhancing the device's practicality and convenience; 3. This utility model utilizes the adjustable height of the first sliding rod, the second sliding rod, and the sliding cylinder to precisely engage the first, second, and third rotatable locking cylinders. The design, featuring a quasi-fixed reading system and dual readings on both the first and second scale lines, achieves the beneficial effect of being widely applicable and capable of collecting diverse experimental data as needed. Specifically, it allows for the collection of ultimate bending resistance data by pulling the rod until it breaks, thus clarifying the ultimate bending resistance of millet varieties; it enables the collection of data on the deformation differences of different rod diameters by setting a uniform tension and comparing bending displacements, thus distinguishing the strength of bending resistance; and it allows for the collection of data on the changes in bending resistance of the same plant at different stages by tracking different growth cycles of individual plants in the field, supporting research on the growth characteristics of varieties and meeting the diverse data collection needs in scientific research and production. Attached Figure Description

[0017] Figure 1 This is a front view of the present utility model; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a three-dimensional structural diagram of the base of this utility model; Figure 5This is a three-dimensional structural diagram of the sliding support mechanism of this utility model; Figure 6 This is a schematic diagram of the internal structure of the tension component of this utility model; Figure 7 This is a left view of the tension component of this utility model; Figure 8 for Figure 7 AA section view in the middle; Figure 9 for Figure 7 BB cross-section view in the middle; Figure 10 This is a three-dimensional structural diagram of the snap-on dustproof reading cover of this utility model; Figure 11 This is a three-dimensional structural diagram of the first rotatable snap-fit ​​cylinder of this utility model; The markings in the diagram are as follows: 1. Base; 11. H-shaped base; 12. Slide cylinder; 13. Second scale line; 2. Sliding support mechanism; 21. First sliding rod; 211. Sliding hole; 22. Support box; 3. Tension assembly; 31. Pull plate; 32. First rotatable snap-fit ​​cylinder; 33. Force measuring pull ring; 34. Mounting box; 35. Tension spring; 36. Groove; 37. Fixing ring; 38. Connecting ring; 39. Rectangular slide groove; 310. Reading pointer; 311. Limiting block; 312. Limiting surface; 313. Snap-fit ​​dustproof reading cover; 314. First scale line; 4. Second sliding rod; 41. Connecting rod; 5. Second rotatable snap-fit ​​cylinder; 6. Third rotatable snap-fit ​​cylinder; 7. Left half-cylindrical structure; 71. Rotating column; 72. Snap-fit ​​groove; 8. Right half-cylindrical structure; 81. Rotating cylinder; 82. Snap tooth; 9. Spike. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. For example... Figure 1-11As shown, the technical solution adopted by this utility model is: a millet plant stem diameter bending resistance testing device, including a base 1, the base 1 including an H-shaped base 11, two sliding cylinders 12 symmetrically distributed along the width direction are provided above the H-shaped base 11, and a slidable support mechanism 2 is assembled above the sliding cylinders 12; the slidable support mechanism 2 includes two first sliding rods 21, the two first sliding rods 21 respectively form a matching sliding fit with the two sliding cylinders 12 in the two sliding cylinders 12, and a support box 22 is fixedly connected between the two first sliding rods 21. A tension component 3 is installed in the support box 22, and the tension component 3 includes a pull plate 3. 1. A first rotatable fastening cylinder 32 is fixedly provided on the front side of the pull plate 31. The front side of the first rotatable fastening cylinder 32 extends forward, and through holes are provided at both ends of the extended part. A force measuring pull ring 33 is provided in the through hole. Sliding holes 211 are provided on the upper surface of the two first sliding rods 21. Two second sliding rods 4 are provided above the two first sliding rods 21. The two second sliding rods 4 respectively form a sliding fit with the sliding holes 211 on the two first sliding rods 21. The top ends of the two second sliding rods 4 are fixedly connected by a connecting rod 41. A second rotatable fastening cylinder 5 is installed in the center of the front side of the connecting rod 41. A third rotatable locking cylinder 6 is installed on the central front side of the H-shaped base 11; when the first rotatable locking cylinder 32, the second rotatable locking cylinder 5, and the third rotatable locking cylinder 6 are in the locking state, their top-view projections correspond to each other; the working principle of the above setup is as follows: When testing the bending resistance of millet plant stalk diameter, the overall height of the device can be adjusted according to the actual height of the millet stalk diameter to be tested to adapt to the data acquisition requirements. If the height needs to be adjusted, loosen the limiting bolts between the first sliding rod 21 and the sliding cylinder 12, and between the second sliding rod 4 and the first sliding rod 21, and push the first sliding rod 21 to slide vertically along the sliding cylinder 12 to adjust the height of the support box 22 and the tension component 3, and push the second sliding rod 4 to slide vertically along the sliding hole 211 on the first sliding rod 21. The height of the second rotatable locking cylinder 5 can be adjusted. After the height is adjusted to match the upper and lower ends and the middle of the millet stalk diameter, the bolts are tightened to complete the limiting and fixing. Then, the upper part of the millet stalk diameter is put into the second rotatable locking cylinder 5, and the lower part is put into the third rotatable locking cylinder 6, so that the middle part of the stalk diameter is put into the first rotatable locking cylinder 32. The three rotatable locking cylinders are fastened to fix the stalk diameter. At this time, the three are aligned in the top view, ensuring that the stalk diameter is in a vertical and stable state. Finally, by pulling the force measuring ring 33, the pull plate 31 is moved, so that the tension component 3 generates tension and acts on the middle of the stalk diameter. At the same time, with the help of the force feedback and scale markings of the tension component 3, the deformation and bending force value of the stalk diameter during the stress process are recorded in real time, thereby completing the test of the bending resistance of the millet plant stalk diameter.

[0019] The tension assembly 3 also includes a mounting box 34 and a tension spring 35. The mounting box 34 is fixedly installed inside the support box 22. A groove 36 is formed in the middle of the width direction of the upper surface of the mounting box 34 along its own length direction. A fixing ring 37 is provided on the rear side wall of the groove 36 inside the mounting box 34. A pull plate 31 that can move along the length direction of the groove 36 is provided on the front side of the groove 36. A connecting ring 38 is installed on the rear end face of the pull plate 31. One end of the tension spring 35 is sleeved on the fixing ring 37, and the other end of the tension spring 35 is sleeved on the connecting ring 38. In the mounting box 34, the groove 36 provides installation and movement space for the tension spring 35 and the pull plate 31. The fixing ring 37 and the connecting ring 38 serve as fixed fulcrums at both ends of the tension spring 35, allowing the tension spring 35 to be in a tensioned state. When the pull plate 31 is pulled, the pull plate 31 will stretch the tension spring 35 to generate elastic tension. Utilizing the elastic deformation characteristics of the tension spring 35, the bending resistance of the rod diameter is converted into the tension of the tension spring 35, providing a force transmission carrier for subsequent testing. The tension spring 35 can be replaced with a tension spring 35 with an appropriate tension effect according to actual measurement needs.

[0020] The front end face of the mounting box 34 is provided with a rectangular slide groove 39 that communicates with the groove 36. The pull plate 31 can move along its length within the rectangular slide groove 39. In this configuration, the rectangular slide groove 39 communicates with the groove 36 to form a moving channel for the pull plate 31, limiting the movement trajectory of the pull plate 31 and ensuring that the pull plate 31 can only move along the length of the mounting box 34, thus preventing the pull plate 31 from shifting left or right or rotating during the force application process. This structure ensures that the tension spring 35 is always stretched in the preset direction, so that the tension is stably applied to the rod diameter, preventing the change in the direction of force transmission due to the displacement deviation of the pull plate 31, which would affect the accuracy of the detection data.

[0021] The inner edge of the middle rear portion of the pull plate 31 extends upward to form a reading pointer 310. The left and right sides of the pull plate 31 extend to the left and right respectively to form two limiting blocks 311 with the same structure but opposite directions. In this configuration, the reading pointer 310 moves synchronously with the pull plate 31, which can intuitively reflect the displacement of the pull plate 31 on the subsequent scale line. Through the correspondence between the pointer and the scale, the movement distance of the pull plate 31 can be quantitatively read, thereby indirectly obtaining the deformation information of the rod diameter after being subjected to force. The limiting blocks 311 on both sides are used to cooperate with the limiting surface 312 of the rectangular slide groove 39. When the pull plate 31 moves to the limit position, the limiting block 311 will contact the limiting surface 312 to prevent the pull plate 31 from moving excessively, causing the tension spring 35 to exceed the elastic limit or the rod diameter to be excessively stretched, thus playing a mechanical limiting protection role.

[0022] The width of the front side of the rectangular slide 39 is smaller than the width of the rest, so that the front wall of the rectangular slide 39 inside the mounting box 34 forms a limiting surface 312. When the pull plate 31 moves to the preset position, the limiting block 311 abuts against the limiting surface 312, preventing the pull plate 31 from moving further. In this setting, the width of the front side of the rectangular slide 39 is reduced, so that its front wall forms a raised limiting surface 312. This structure uses the difference in shape of the slide itself to achieve the limiting function, without the need for additional limiting components. When the pull plate 31 moves forward under the action of the pulling force, the limiting blocks 311 on both sides will gradually approach the limiting surface 312. When it moves to the preset position (the tension spring 35 reaches the safety upper limit or the rod diameter is about to exceed the detection range), the limiting block 311 abuts tightly against the limiting surface 312, and the mechanical blocking restricts the pull plate 31 from moving further, avoiding damage to the tension spring 35 or excessive deformation of the rod diameter affecting the detection.

[0023] A snap-on dustproof reading cover 313 is installed above the groove 36. The upper surface of the snap-on dustproof reading cover 313 has a notch, and the reading pointer 310 can move along the length of the notch. A first scale line 314 is provided on the upper end surface of the snap-on dustproof reading cover 313 and on one side corresponding to the notch. In this configuration, the snap-on dustproof reading cover 313 can prevent external dust and impurities from entering the mounting box 34, avoiding contamination of components such as the tension spring 35 and the pull plate 31, which would affect their smooth movement. The notch provides space for the reading pointer 310 to move, ensuring that the pointer is not blocked by the dustproof cover when it moves with the pull plate 31. The first scale line 314 serves as a reading reference. In conjunction with the moving pointer, the displacement value of the pull plate 31 can be directly read, and the corresponding tension can be calculated based on the elastic coefficient of the tension spring 35, realizing the visual reading of the detection data and improving the convenience of reading. The unit of the first scale line 314 is N or gf.

[0024] The two first sliding rods 21 have 2-8 threaded holes evenly spaced vertically on the front side of their lower half. The two sliding cylinders 12 have through holes on their upper front side, through which bolts can be inserted to restrict the sliding of the first sliding rods 21. The two second sliding rods 4 have 2-8 threaded holes evenly spaced vertically on their front side. The two first sliding rods 21 have through holes on their upper front side, through which bolts can be inserted to restrict the sliding of the second sliding rods 4. In this configuration, the first sliding rods 21 and the sliding cylinder 12, and the second sliding rods 4 and the first sliding rods 21 are detachably fixed through a "bolt-through hole-threaded hole" connection. When height adjustment is required, unscrewing the bolts allows the sliding rods to move vertically along the sliding cylinder 12 or the sliding hole 211. After adjusting to the target height, the bolts are inserted through the through holes into the corresponding threaded holes and tightened, using the friction between the bolts and the threads to fix the position of the sliding rods. The 2-8 evenly distributed threaded holes provide multiple height options to accommodate different millet stalk diameters.

[0025] The first rotatable fastening cylinder 32 includes a left half-cylindrical structure 7 and a right half-cylindrical structure 8. The left half-cylindrical structure 7 has a rotating column 71 on its front side and a fastening groove 72 on its rear side. The right half-cylindrical structure 8 has a rotating cylinder 81 on its front side that rotates in conjunction with the rotating column 71 and a fastening tooth 82 on its rear side that can be fitted and fastened to the fastening groove 72. The rear side of the left half-cylindrical structure 7 extends rearward and is fixed to the front end face of the pull plate 31. When the first rotatable fastening cylinder 32 is in the fastened state, the fastening tooth 82 of the right half-cylindrical structure 8 is fastened in the fastening groove 72. In this configuration, the left half... The cylindrical structure 7 is fixed to the pull plate 31, providing an installation base for the snap-fit ​​cylinder; the right half of the cylindrical structure 8 cooperates with the rotating column 71 of the left half of the cylindrical structure 7 through the rotating cylinder 81, and can rotate around the rotating column 71 to open and close, making it easy to put the millet stalk diameter into the snap-fit ​​cylinder; when snapping, the right half of the cylindrical structure 8 is rotated to make the snap teeth 82 engage with the snap-fit ​​groove 72, and the snap-fit ​​cylinder is closed through the mechanical engagement of the snap teeth 82 and the snap-fit ​​groove 72, thereby fixing the stalk diameter in the snap-fit ​​cylinder, ensuring that the pulling force of the pull plate 31 can be stably transmitted to the stalk diameter, and at the same time preventing the stalk diameter from falling off during the testing process.

[0026] Both the second rotatable locking cylinder 5 and the third rotatable locking cylinder 6 include a left half-cylindrical structure 7 and a right half-cylindrical structure 8, and both the left half-cylindrical structure 7 and the right half-cylindrical structure 8 of the second rotatable locking cylinder 5 and the third rotatable locking cylinder 6 have inwardly protruding spikes 9 on their inner center. In this configuration, the opening and closing principle of the left and right half-cylindrical structures is the same as that of the first rotatable locking cylinder 32, ensuring operational uniformity. When the locking cylinder closes to fix the rod diameter, the spikes 9 on the inner center will penetrate the surface tissue of the rod diameter, increasing the friction and biting force between the locking cylinder and the rod diameter, preventing the rod diameter from sliding or dislodging along the inner wall of the locking cylinder during the deformation process. Especially for millet stalks with smooth surfaces or soft textures, this invention significantly improves fixation stability, ensuring the stalk position remains unchanged during testing. The length of the protrusion 9 is set at 1.0-1.5mm. This length ensures that the protrusion 9 can only penetrate the surface cuticle or epidermis of the millet stalk during field growth, without penetrating to the vascular bundles responsible for nutrient and water transport beneath the cortex. This avoids damage to key tissues responsible for stalk growth, ensuring that the measurement of the millet stalk diameter does not affect its subsequent growth. It also facilitates the re-measurement of the millet stalk diameter after growth, thus contributing to the scientific rationality of this invention.

[0027] On one side of the upper end face of the H-shaped base 11, there is a second scale line 13 extending along the length of the H-shaped base 11. In this setting, the unit of the second scale line 13 is centimeters. The second scale line 13 extends along the length of the H-shaped base 11 and can be used as a visual judgment benchmark for the degree of bending of the millet stalk diameter. During the test, when the force measuring ring 33 is pulled to apply the tension to the middle of the stalk diameter, the stalk diameter will bend due to the force, causing the first rotatable fastening cylinder 32 fixed thereto to shift laterally. At this time, by observing the position of the first rotatable fastening cylinder 32 on the second scale line 13 from above, the lateral displacement of the stalk diameter after bending can be directly read. The smaller the displacement, the smaller the deformation of the stalk diameter under the current tension, and the stronger the bending resistance. The larger the displacement, the weaker the bending resistance of the stalk diameter. Thus, the bending resistance of the stalk diameter is quantified through the corresponding relationship of the scale displacement, providing an intuitive and accurate judgment basis for the assessment of bending resistance.

[0028] Example 1

[0029] When it is necessary to determine the ultimate breaking strength of the millet stalk diameter, first adjust the height of the millet stalk according to the actual height of the millet stalk to be tested: unscrew the limiting bolt between the first sliding rod 21 and the slide cylinder 12, and the limiting bolt between the second sliding rod 4 and the first sliding rod 21; push the first sliding rod 21 to slide vertically along the slide cylinder 12 to adjust the height of the support box 22 and the tension component 3; push the second sliding rod 4 to slide vertically along the sliding hole 211 on the first sliding rod 21 to adjust the height of the second rotatable fastening cylinder 5. After adjusting the height to match the upper and lower ends and middle of the millet stalk diameter, retighten the bolts to complete the limiting and fixing; then open the first rotatable locking cylinder 32, the second rotatable locking cylinder 5, and the third rotatable locking cylinder 6, placing the upper part of the millet stalk diameter into the second rotatable locking cylinder 5, the lower part into the third rotatable locking cylinder 6, and the middle part into the first rotatable locking cylinder 32, and close the first rotatable locking cylinder 32 so that the locking teeth 82 of the right half-cylindrical structure 8 engage with the locking teeth of the left half-cylindrical structure 7. Within the groove 72, the second rotatable locking cylinder 5 and the third rotatable locking cylinder 6 are closed, causing the locking teeth 82 of their respective right half-cylindrical structures 8 to engage within the locking groove 72 of their corresponding left half-cylindrical structures 7. The protrusions 9 at the center of the inner side of the second rotatable locking cylinder 5 and the third rotatable locking cylinder 6 penetrate the surface of the millet stalk to achieve a secure fixation. Subsequently, the force-measuring pull ring 33 is slowly pulled, causing the force-measuring pull ring 33 to drive the pull plate 31 along the rectangular sliding groove 39 on the front end face of the mounting box 34 and the groove 36 on the upper surface of the mounting box 34. As the pull plate 31 moves, the tension spring 35 of the tension assembly 3 is stretched. The tension is transmitted to the middle of the millet stalk diameter through the first rotatable fastening cylinder 32. The force measuring ring 33 is continuously pulled until the millet stalk diameter is broken. At this time, the tension value corresponding to the reading pointer 310 formed by the upward extension of the inner side of the middle part of the rear of the pull plate 31 on the first scale line 314 on the upper end face of the fastening dustproof reading cover 313 is recorded. This value is the breaking resistance of the millet stalk diameter, which can be used to determine its ultimate bending resistance performance.

[0030] Example 2

[0031] To compare the bending degree of different millet stalk diameters under the same external force, when it is necessary to compare the bending degree of different millet stalk diameters under the same external force, first, according to the device height adjustment method in Example 1, the height of each millet stalk to be tested is adapted, and the millet stalk diameter to be tested is fixed according to the method in Example 1. Then, a uniform target tensile force value is set, and the force measuring ring 33 corresponding to each millet stalk diameter is slowly pulled. The movement of the reading pointer 310 of the pull plate 31 on the first scale line 314 is observed. When the reading pointer 310 is precisely aligned with the same tension value scale line, stop pulling the force measuring ring 33. After maintaining the tension stability, observe from above the position of the first rotatable buckle cylinder 32 on the second scale line 13 extending along the length direction on one side of the upper end face of the H-shaped base 11. Record the lateral displacement corresponding to each millet stalk diameter. The smaller the displacement, the smaller the deformation of the millet stalk diameter under the current external force and the stronger its bending resistance. By comparing the displacement data of different millet stalk diameters, the differences in their bending resistance performance can be intuitively distinguished.

[0032] Example 3

[0033] When it is necessary to monitor the change in bending resistance of the same single millet plant at different growth stages, a target single millet plant is selected in the field. For the first test (such as the seedling stage), the device height is adjusted according to the device height method in Example 1 to match the height of the single millet plant at the seedling stage. The bolts are tightened for fixation, and the stalk diameter of the millet to be tested is fixed according to the method in Example 1. Then, the force measuring ring 33 is pulled to the preset tension value, and the tension value on the first scale line 314 of the reading pointer 310 and the bending displacement of the first rotatable fastening cylinder 32 on the second scale line 13 are recorded. After the first test is completed, the first rotatable fastening cylinder 312 is opened. 2. The second rotatable locking cylinder 5 and the third rotatable locking cylinder 6 allow the millet to continue to grow naturally. When the millet enters the jointing stage, grain filling stage, and other subsequent growth cycles, the above operation is repeated. The second scale line 13 on the H-shaped base 11 is used to locate the same position as the first test, keeping the preset tension value consistent. By comparing the tension value of the reading pointer 310 on the first scale line 314 and the bending displacement data of the first rotatable locking cylinder 32 on the second scale line 13 under different growth cycles, the trend of the bending resistance of the single millet plant at different stages can be clearly identified, providing data support for the study of the growth characteristics of the variety.

Claims

1. A device for testing the bending resistance of millet plant stems, comprising a base, characterized in that, The base includes an H-shaped base, with two symmetrically distributed sliding cylinders on top of the H-shaped base along the width direction. A slidable support mechanism is mounted on top of the sliding cylinders. The slidable support mechanism includes two first sliding rods, which are respectively fitted and slidably engaged with the two sliding cylinders. A support box is fixedly connected between the two first sliding rods. A tension component is installed inside the support box. The tension component includes a pull plate. A first rotatable fastening cylinder is fixedly provided on the front side of the pull plate. The front side of the first rotatable fastening cylinder extends forward, and through holes are opened at both ends of the extended part. A force-measuring pull ring is provided in the through hole. The upper surfaces of the two first sliding rods are provided with sliding holes, and two second sliding rods are provided above the two first sliding rods. The two second sliding rods are respectively adapted to slide with the sliding holes on the two first sliding rods. The top ends of the two second sliding rods are fixedly connected by a connecting rod, and a second rotatable fastening cylinder is installed in the center of the front side of the connecting rod. A third rotatable locking cylinder is installed on the central front side of the H-shaped base; When the first rotatable locking cylinder, the second rotatable locking cylinder, and the third rotatable locking cylinder are in the locking state, their top-view projections correspond to each other.

2. The millet plant stem diameter bending resistance testing device according to claim 1, characterized in that: The tension assembly also includes a mounting box and a tension spring. The mounting box is fixedly installed inside the support box. A groove is formed in the middle of the width direction of the upper surface of the mounting box along its own length direction. A fixing ring is provided on the rear side wall of the groove inside the mounting box. A pull plate that can move along the length direction of the groove is provided on the front side of the groove. A connecting ring is installed on the rear end face of the pull plate. The tension spring hook at one end of the tension spring is sleeved on the fixing ring, and the tension spring hook at the other end of the tension spring is sleeved on the connecting ring.

3. The millet plant stem diameter bending resistance testing device according to claim 2, characterized in that: The front end of the mounting box has a rectangular slide groove that communicates with the groove, and the pull plate can move along its length within the rectangular slide groove.

4. The millet plant stem diameter bending resistance testing device according to claim 3, characterized in that: The inner edge of the middle part behind the pull plate extends upward to form a reading pointer. The left and right sides behind the pull plate extend to the left and right respectively to form two limit blocks with the same structure but opposite directions.

5. The millet plant stem diameter bending resistance testing device according to claim 4, characterized in that: The width of the front side of the rectangular slide is smaller than the width of the rest, so that the front wall of the rectangular slide inside the mounting box forms a limiting surface; when the pull plate moves to the preset position, the limiting block abuts against the limiting surface, preventing the pull plate from moving further.

6. The millet plant stem diameter bending resistance testing device according to claim 5, characterized in that: A snap-on dustproof reading cover is installed above the groove. The upper surface of the snap-on dustproof reading cover has a notch, and the reading pointer can move along the length of the notch. A first scale line is provided on the upper end face of the snap-on dustproof reading cover and on one side corresponding to the notch.

7. The millet plant stem diameter bending resistance testing device according to claim 1, characterized in that: Two first sliding rods have 2-8 threaded holes evenly spaced vertically on the front side of their lower half. Two sliding cylinders have through holes on their upper front side. Bolts can be inserted through the through holes into the threaded holes to restrict the sliding of the first sliding rods. Two second sliding rods have 2-8 threaded holes evenly spaced vertically on their front side. Two first sliding rods have through holes on their upper front side. Bolts can be inserted through the through holes into the threaded holes to restrict the sliding of the second sliding rods.

8. The millet plant stem diameter bending resistance testing device according to claim 1, characterized in that: The first rotatable fastening cylinder includes a left half-cylindrical structure and a right half-cylindrical structure. The left half-cylindrical structure has a rotating column on the front side and a fastening groove on the rear side. The right half-cylindrical structure has a rotating cylinder on the front side that rotates in conjunction with the rotating column and a fastening tooth on the rear side that can be adapted to fasten the fastening groove. The rear side of the left half-cylindrical structure extends rearward and is fixed to the front end face of the pull plate. When the first rotatable fastening cylinder is in the fastening state, the fastening tooth of the right half-cylindrical structure is fastened in the fastening groove.

9. The millet plant stem diameter bending resistance testing device according to claim 8, characterized in that: Both the second and third rotatable fastening cylinders include a left half-cylindrical structure and a right half-cylindrical structure, and the inner middle part of the left half-cylindrical structure and the right half-cylindrical structure of the second and third rotatable fastening cylinders is provided with an inwardly protruding spike.

10. A device for detecting the bending resistance of millet plant stems according to claim 1, characterized in that: On one side of the upper surface of the H-shaped base, there is a second scale line extending along the length of the H-shaped base.

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