An insertable corn stalk breaking strength and lodging correlation tester
By designing a limiting arc plate and an elastic shell to prevent slippage, the problem of lateral slippage of the stem during testing was solved, enabling high-precision measurement of flexural strength and multi-angle testing, thus improving the reliability and accuracy of the data.
Patent Information
- Application Number
- CN202522569678.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-03
AI Technical Summary
In existing tests for the bending strength of corn stalks, the stalks are prone to lateral slippage or twisting when in contact with the probe, resulting in large measurement errors, poor repeatability, and difficulty in conducting multi-angle tests, which affects data analysis.
An insertable corn stalk bending strength and lodging correlation tester was designed. Through the synergistic effect of the limiting arc plate, elastic shell and internal elastic block, an anti-slip mechanism is formed to ensure that the stalk does not slip laterally during the test and can carry out multi-angle continuous bending load test.
It improves the accuracy and repeatability of measurements, obtains experimental data with smaller dispersion, provides a more comprehensive assessment of stem lodging resistance, and supports scientific research and breeding decisions.
Smart Images
Figure CN224933784U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of agricultural testing equipment technology, specifically an insertable corn stalk bending strength and lodging correlation tester. Background Technology
[0002] In maize breeding and cultivation physiology research, stalk bending strength is a key mechanical indicator for measuring lodging resistance. Accurate bending strength data is crucial for screening superior lodging-resistant germplasm and evaluating the effectiveness of cultivation measures. Currently, field stalk strength measurements are mostly performed using handheld force gauges. The typical operation involves placing the instrument's probe directly against a specific height of the stalk, applying a force to bend the stalk, and recording the maximum force at the specific bending angle or breakage. However, this method has the following inherent drawbacks:
[0003] First, during the process of applying a thrust to force the stem to bend, a significant tangential force is generated at the contact point between the stem and the probe, which can easily cause the stem to slip laterally or even twist relative to the probe. This unexpected displacement not only introduces measurement errors, resulting in large data dispersion and poor repeatability, but may also cause the stem to bend or break at abnormal locations due to changes in stress distribution, failing to accurately reflect its inherent mechanical properties. Second, during testing, it is difficult to perform stem bending strength tests in different directions at the same location on the stem. When reversing the direction of the test, the instrument probe is prone to positional shift, thus affecting subsequent data analysis on the correlation between stem bending strength and lodging. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides an insertable corn stalk bending strength and lodging correlation tester.
[0005] To achieve the above objectives, the technical solution of this utility model is as follows:
[0006] An insertable corn stalk flexural strength and lodging correlation tester includes:
[0007] The mounting frame is vertically set on the ground, and the surface of the mounting frame is provided with a guide groove that limits the movement path to a semi-circular shape.
[0008] Positioning components, symmetrically located at both ends of the mounting frame, are used to prevent the corn stalk from aligning with the axis of the guide groove;
[0009] The column has two ends that are slidably disposed in the guide groove, and a moving rod that moves through the axis of the guide groove is slidably disposed on the surface of the column. The end face of the moving rod is provided with a thrust tester for detecting the bending strength of the stem.
[0010] A limiting arc plate is provided at the test end of the thrust tester, and elastic shells are symmetrically provided on both sides of the inner wall of the limiting arc plate facing the moving direction of the moving rod. An elastic block with a length equal to the width of the inner cavity of the elastic shell is provided in the middle of the inner wall of the elastic shell.
[0011] In this process, after the mounting frame locks the relative position of the stem with the positioning component, the stem is positioned exactly inside the limiting arc plate. At this time, the moving rod is pushed, and the force exerted by the limiting arc plate on the stem causes the stem to bend. The stem squeezes the middle of the outer wall of the elastic shell, causing it to sink inward. When the elastic shell deforms, it squeezes the elastic block to deform, so that the contact surface forms a continuous sealing curved surface. This forces the inner cavity of the elastic shell to differentiate into two independent positive pressure cavities that can resist the lateral movement of the stem.
[0012] Preferably, the outer wall of the elastic shell has a curved structure, and the thickness of the end faces of the elastic shell is greater than the thickness of the curved surface in the middle. At the same time, the thickness of the curved structure of the elastic shell gradually increases from the middle to the two ends, so that the deformation amplitude at the two ends of the elastic shell is smaller than the deformation amplitude in the middle.
[0013] Preferably, the surface of the elastic block has an arc-shaped protrusion on the side facing the inner cavity of the limiting arc plate, and the arc-shaped protrusion has symmetrically integrally formed arc-shaped protrusions near both ends of the elastic shell, so that the contact surface between the inner wall of the elastic shell and the surface of the elastic block forms a folded turning structure.
[0014] Preferably, both ends of the column are provided with protrusions that slide in the guide groove, and a gap is left between the side wall of the protrusion and the side wall of the guide groove for the protrusion and the column to move. At the same time, when the protrusion presses against the side wall of the guide groove, it forms an abutment surface for locking the relative position of each other.
[0015] Preferably, the positioning element includes a positioning rod and a positioning cylinder. The positioning rod is slidably fitted inside the positioning cylinder, and an elastic element for automatically restoring the initial relative position is provided between the positioning cylinder and the positioning rod. The end of the positioning rod away from the positioning cylinder has a V-shaped structure that is easy to clamp and position.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] 1. Through the synergistic effect of the limiting arc plate, elastic shell and internal elastic block, a passively triggered and dynamically generated anti-slip mechanism is creatively provided. When the stem is bent by the thrust, its reaction force squeezes the elastic shell to deform and compresses the internal elastic block until the inner wall of the elastic shell contacts the surface of the elastic block to form a sealing surface, thereby dividing the single inner cavity of the elastic shell into two independent positive pressure cavities. The lateral pressure generated by the positive pressure cavities can be automatically and instantly applied to the stem to form an effective lateral clamping force, which accurately counteracts the tendency of the stem to slide laterally.
[0018] 2. By effectively suppressing lateral slippage and torsion of the stem at the stress point, the thrust is ensured to be used entirely to overcome the stem's own bending moment, making the measured flexural strength value more accurately reflect the stem's inherent mechanical properties. This mechanism significantly reduces random errors caused by inconsistent operation or sample slippage, thereby obtaining experimental data with smaller dispersion, higher repeatability, and stronger comparability, providing a reliable guarantee for accurate scientific research and breeding decisions.
[0019] 3. The mechanical system consisting of the mounting frame, guide groove, column, and moving rod enables the thrust tester to move precisely along a semi-circular path along the circumference of the stem. Combined with the aforementioned anti-slip mechanism, it not only enables single-point flexural strength testing but also has the ability to perform multi-angle, continuous bending load testing on the same stem sample. This testing mode can better simulate the complex mechanical challenges posed to the stem by gusts from different directions in nature, thereby providing more comprehensive data support for evaluating the overall lodging resistance of the stem. Attached Figure Description
[0020] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:
[0021] Figure 1 This is a schematic diagram of the overall appearance and structure of the present utility model;
[0022] Figure 2 This is a schematic diagram of the horizontal cross-sectional structure of the limiting arc plate of this utility model;
[0023] Figure 3 This is a schematic diagram of the vertical cross-sectional structure of the limiting arc plate of this utility model.
[0024] The diagram shows the following labels: 1. Mounting frame; 11. Guide groove; 2. Positioning component; 3. Column; 31. Moving rod; 32. Thrust tester; 6. Limiting arc plate; 61. Elastic shell; 62. Elastic block. Detailed Implementation
[0025] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.
[0026] Example
[0027] like Figures 1 to 3As shown, an insertable corn stalk bending strength and lodging correlation tester includes:
[0028] Mounting frame 1 is vertically mounted on the ground, and the surface of mounting frame 1 is provided with a guide groove 11 that limits the movement path to a semi-circular shape;
[0029] Positioning element 2, which is symmetrically arranged at both ends of the mounting frame 1, is used to restrict the corn stalk from coinciding with the axis of the guide groove 11;
[0030] The column 3 has its two ends slidably disposed in the guide groove 11, and the surface of the column 3 is slidably provided with a moving rod 31 whose moving path passes through the axis of the guide groove 11. The end face of the moving rod 31 is provided with a thrust tester 32 for detecting the bending strength of the stem.
[0031] The limiting arc plate 6 is located at the test end of the thrust tester 32, and the inner sidewall of the limiting arc plate 6 is symmetrically provided with elastic shells 61 on both sides of the moving direction of the moving rod 31. The inner wall of the elastic shell 61 is provided with an elastic block 62 with a length equal to the width of the inner cavity of the elastic shell 61.
[0032] In this system, the mounting frame 1 fixes the stem inside the limiting arc plate 6 via the positioning component 2. During testing, the moving rod 31 is pushed, and the force applied to the stem by the thrust tester 32 and the limiting arc plate 6 causes it to bend. The bending reaction force of the stem compresses the middle of the outer wall of the elastic shell 61, causing the elastic shell 61 to undergo inward deformation. This deformation compresses the elastic block 62 inside the elastic shell 61, ultimately causing the inner wall of the elastic shell 61 to fit tightly against the surface of the elastic block 62, forming a continuous curved sealing surface. This sealing surface divides the inner cavity of a single elastic shell 61 into two independent sealed air chambers. As the deformation intensifies, the volume of the air chambers decreases, the internal air pressure increases, forming a positive pressure, thereby generating effective clamping resistance against the stem attempting to move laterally.
[0033] Specifically, when it is necessary to test the stalk bending strength of live corn plants in the field, the tester is set up in a suitable position. The ground nails at the bottom of the mounting frame 1 can be inserted into the ground to enhance stability, so that the corn plant stalk can be restricted by the positioning part 2 at the axis of the arc surface of the mounting frame 1, and the stalk also passes vertically through the inner cavity of the limiting arc plate 6. At this time, the relative sliding structure of the locking positioning part 2 is locked, and the moving rod 31 is pushed to move in the horizontal plane. The surface of the moving rod 31 is provided with scale lines for recording corresponding data. The moving rod 31 applies a force to the stalk in the same direction as the moving direction through the thrust tester 32 and the limiting arc plate 6 until the stalk bends or the displacement distance of the stalk reaches the preset value. The thrust tester 32 can record the thrust change in real time and display it on the electrically connected external display, which makes it convenient for users to analyze the correlation between the corn stalk bending strength and lodging by the change of thrust data.
[0034] The combination of column 3 and moving rod 31 enables the thrust tester and limiting arc plate 6 to apply a stable horizontal force to the same position of the stalk. The combination of mounting frame 1, guide groove 11 and column 3 enables the thrust tester to test the flexural strength of the stalk at the same position from multiple directions and record the corresponding data, thereby enhancing the accuracy of the analysis of the correlation between stalk flexural strength and lodging. Moreover, by adjusting the sliding position of moving rod 31 on the surface of column 3, the tester can test the flexural strength and collect data at different height positions of corn stalk.
[0035] Meanwhile, the core of the anti-slip mechanism lies in the following: when the stem squeezes the elastic shell 61, causing it to deform inward, the inward part simultaneously squeezes the elastic block 62, eventually causing the two surfaces to adhere together to form a curved sealing separation surface. This sealing surface divides the original inner cavity of the elastic shell 61 into two independent sealed air chambers. As the deformation continues, the volume of the air chambers is compressed. Since the air cannot be discharged and the expansion amplitude at both ends of the elastic shell 61 is very small, almost non-existent, the air pressure in the chambers increases significantly, forming a positive pressure environment. This positive pressure generates a lateral clamping force on the surface of the stem. Moreover, if the stem has a tendency to move laterally, it will further change the shape and volume of the air chambers, triggering a dynamic adjustment of the air pressure, thereby generating an adaptive resistance that is opposite to the displacement trend. This mechanism can effectively suppress the positional deviation of the stem during the test and significantly improve the measurement accuracy.
[0036] The outer wall of the elastic shell 61 has a curved structure, and the thickness of the end faces of the elastic shell 61 is greater than the thickness of the curved surface in the middle. At the same time, the thickness of the curved structure of the elastic shell 61 gradually increases from the middle to the two ends, so that the deformation amplitude at the two ends of the elastic shell 61 is smaller than the deformation amplitude in the middle.
[0037] Specifically, this thickness distribution design makes the central curved area of the elastic shell 61 a structural weak point. When compressed by the stem, deformation will preferentially and concentratedly occur in this area. This ensures that the elastic shell 61 can indent in a controllable and consistent manner, thereby stably compressing the internal elastic block 62. At the same time, the structure that gradually thickens towards both ends enhances the rigidity and connection strength of the connection between the elastic shell 61 and the limiting arc plate 6, preventing tearing or fatigue damage from the root during repeated deformation. This ensures the reliability and service life of the sealing structure, increases the deformation threshold at both ends of the elastic shell 61, and reduces the amplitude of expansion deformation at both ends of the elastic shell 61 due to internal air pressure. Furthermore, the gradually thickening structure can also simultaneously increase the resistance encountered when the stem shifts laterally, reducing the probability of the stem shifting position during the test.
[0038] The surface of the elastic block 62 has an arc-shaped protrusion on the side facing the inner cavity of the limiting arc plate 6. The arc-shaped protrusion is symmetrically provided with integrally formed arc-shaped protrusions near both ends of the elastic shell 61, so that the contact surface between the inner wall of the elastic shell 61 and the surface of the elastic block 62 forms a folded turning structure.
[0039] Specifically, the arc-shaped protrusion fits more closely to the cylindrical outer surface of the stem, increasing the initial contact area. When the elastic shell 61 is compressed and indented, its inner wall first contacts the arc-shaped protrusions at both ends of the elastic block 62, forming an initial line contact or small-area contact seal. As the pressure increases, the inner wall of the elastic shell 61 forces the elastic block 62 to undergo adaptive deformation, ultimately forming a large-area, tightly fitted, curved-structure sealing separation plane between the inner wall of the elastic shell 61 and the surface of the elastic block 62. The folded transition structure formed by the arc-shaped protrusion between the elastic shell 61 and the elastic block 62 guides the deformation and strengthens the sealing process. It also helps to limit the probability of lateral displacement of the indented part of the elastic shell 61.
[0040] Both ends of the column 3 are provided with protrusions that fit and slide within the guide groove 11, and a gap is left between the side wall of the protrusion and the side wall of the guide groove 11 for the protrusion and the column 3 to move. At the same time, when the protrusion presses against the side wall of the guide groove 11, it forms an abutment surface for locking their relative positions.
[0041] Specifically, the gap ensures that the column 3 can slide flexibly along the guide groove 11 to adjust the test angle. After positioning, a locking element (such as a set bolt) is screwed in and pressed against the protrusion or the side wall of the guide groove 11, which can force the contact surface of the protrusion to generate a huge static friction force with the side wall of the guide groove 11, thereby firmly locking the column 3 and preventing displacement due to reaction force during testing, ensuring the stability of the thrust direction and the accuracy of the data.
[0042] The positioning component 2 includes a positioning rod and a positioning cylinder. The positioning rod is slidably fitted inside the positioning cylinder, and an elastic element for automatically restoring the initial relative position is provided between the positioning cylinder and the positioning rod. The end of the positioning rod away from the positioning cylinder has a V-shaped structure that is easy to clamp and position.
[0043] Specifically, the elastic element is a compression spring or a butterfly spring. The elastic force it provides causes the positioning rod of the V-shaped structure to have a tendency to continuously clamp the stem. When clamping the stem, the user pulls the positioning rod outward to place the stem in the V-shaped opening. After releasing, under the restoring force of the elastic element, the two inclined surfaces of the V-shaped structure can adapt to stems of different diameters and automatically center them, ultimately stably limiting the stem on the axis of the guide groove 11. This structure realizes rapid, non-destructive clamping and precise positioning of live stems, avoiding damage to the plant or affecting the test results due to excessive clamping force or inaccurate positioning.
[0044] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.
Claims
1. An insertable tester for the correlation between the flexural strength and lodging resistance of corn stalks, characterized in that, include: The mounting frame is vertically set on the ground, and the surface of the mounting frame is provided with a guide groove that limits the movement path to a semi-circular shape. Positioning components, symmetrically located at both ends of the mounting frame, are used to prevent the corn stalk from aligning with the axis of the guide groove; The column has two ends that are slidably disposed in the guide groove, and a moving rod that moves through the axis of the guide groove is slidably disposed on the surface of the column. The end face of the moving rod is provided with a thrust tester for detecting the bending strength of the stem. A limiting arc plate is provided at the test end of the thrust tester, and elastic shells are symmetrically provided on both sides of the inner wall of the limiting arc plate facing the moving direction of the moving rod. An elastic block with a length equal to the width of the inner cavity of the elastic shell is provided in the middle of the inner wall of the elastic shell. In this process, after the mounting frame locks the relative position of the stem with the positioning component, the stem is positioned exactly inside the limiting arc plate. At this time, the moving rod is pushed, and the force exerted by the limiting arc plate on the stem causes the stem to bend. The stem squeezes the middle of the outer wall of the elastic shell, causing it to sink inward. When the elastic shell deforms, it squeezes the elastic block to deform, so that the contact surface forms a continuous sealing curved surface. This forces the inner cavity of the elastic shell to differentiate into two independent positive pressure cavities that can resist the lateral movement of the stem.
2. The insertable corn stalk bending strength and lodging correlation tester according to claim 1, characterized in that: The outer wall of the elastic shell has a curved structure, and the thickness of the end faces of the elastic shell is greater than that of the middle curved surface. At the same time, the thickness of the curved structure of the elastic shell gradually increases from the middle to the two ends, which makes the deformation amplitude at the two ends of the elastic shell smaller than that in the middle.
3. The insertable corn stalk bending strength and lodging correlation tester according to claim 1, characterized in that: The surface of the elastic block has an arc-shaped protrusion on the side facing the inner cavity of the limiting arc plate. The arc-shaped protrusion has symmetrically integrally formed arc-shaped protrusions near both ends of the elastic shell, so that the contact surface between the inner wall of the elastic shell and the surface of the elastic block forms a folded turning structure.
4. The insertable corn stalk bending strength and lodging correlation tester according to claim 1, characterized in that: Both ends of the column are provided with protrusions that slide in the guide groove, and there is a gap between the side wall of the protrusion and the side wall of the guide groove for the protrusion and the column to move. At the same time, when the protrusion presses against the side wall of the guide groove, it forms an abutment surface for locking the relative position of each other.
5. The insertable corn stalk bending strength and lodging correlation tester according to claim 1, characterized in that: The positioning component includes a positioning rod and a positioning cylinder. The positioning rod is slidably fitted inside the positioning cylinder, and an elastic element for automatically restoring the initial relative position is provided between the positioning cylinder and the positioning rod. The end of the positioning rod away from the positioning cylinder has a V-shaped structure that is easy to clamp and position.