A test angle-adjustable milli-micro newton level dandelion seed detachment force test system

Abstract

This invention discloses a milli-micro Newton (µN) level dandelion seed release force testing system and method with adjustable testing angle. The system includes a base assembly, a sample fixing platform and its rotation control assembly, a horizontal micro-motion platform, a lifting platform and its movement control assembly, and a force sensor and its fixing assembly. The sample fixing platform and its rotation control assembly are mounted on the horizontal micro-motion platform, which is fixed to the lifting platform and its movement control assembly. The lifting platform and its movement control assembly, along with the force sensor and its fixing assembly, are all vertically mounted on the base assembly. The force sensor employs a high-precision strain gauge structure, enabling real-time acquisition of the release force signal. The sample fixing platform is used to adjust the sample clamping and release angle. The horizontal micro-motion platform compensates for rotational offset, and the lifting platform provides uniform and stable release force loading. This system features continuously adjustable testing angle, stable loading, and high force measurement accuracy.

Description

Technical Field

[0001] This invention belongs to the field of mechanical testing technology, and in particular relates to a nano-micro Newton level dandelion seed release force testing system with adjustable testing angle, which features continuously adjustable testing angle, stable loading, and high force measurement accuracy. Background Technology

[0002] Over millions of years of natural evolution, plants have developed many ingenious strategies for seed dispersal, playing a crucial role in the adaptive evolution of plant reproduction. Among these, the dandelion is the most representative plant in wind-dispersal. The efficient detachment of dandelion seeds from the inflorescence head is a key step in initiating dispersal, and its sophisticated detachment mechanism is of significant research value. The dandelion seed embedding area, due to its barb structure forming a "barb-groove" lock with the inflorescence head groove, and the fact that the embedding depth is much smaller than the length of the non-embedded area, generates a leverage effect, thus exhibiting significant sensitivity to the detachment direction. This provides new inspiration for the biomimetic design of novel controllable locking / releasing mechanisms. Therefore, it is necessary to develop a micro-force testing system specifically for testing the multi-angle detachment force of dandelion seeds to achieve accurate multi-angle characterization of dandelion seed detachment characteristics.

[0003] Invention patent CN110274722A discloses a nano-micronewton-level two-dimensional force micro-motion testing system with an overload protection device. This system includes a testing platform assembly, a horizontal ball screw assembly, a horizontal force sensor assembly, a vertical ball screw assembly, and a vertical force sensor assembly. It can test nano-micronewton-level normal forces, adhesion forces, frictional forces, piercing forces, and shear forces generated by biomimetic prototypes, and also has sensor overload protection functionality. However, this technology can only achieve linear feed and force measurement in the horizontal and vertical directions, lacking the ability for continuously adjustable angle testing, and cannot meet the testing requirements for the multi-angle detachment force of dandelion seeds. Invention patent CN107340231A discloses a centrifugal micro-Newton level insect friction online real-time testing system and method. The testing system mainly consists of four parts: a testing platform and auxiliary mechanisms, a speed-regulating motor and speed controller, a high-speed video imaging system, and a base. The system employs a combination of ball screw and stepper motor, enabling precise control of the displacement of the high-speed video imaging system. The camera center is coaxial with the testing platform center, possessing vertical freedom adjustment capability, allowing real-time adjustment of its vertical distance from the testing platform to accurately obtain the radius information of the test object at the moment of detachment from the platform, thereby calculating the maximum adhesion force generated by the test object on the material surface. The testing accuracy of this system is not limited by the sensor range, making it suitable for characterizing the adhesion characteristics of small insects on different material surfaces. However, the testing process relies on centrifugal rotation to drive sample movement, which generates continuous airflow interference during operation, thus making it unsuitable for accurate testing of dandelion seed detachment force. Invention patent CN105444940A discloses a method for measuring minute forces. This method utilizes components such as a light source, a transparent liquid, a tray, a container, and a camera. It works by using the surface tension of the liquid and gravity to form a concave liquid surface. Light refracts through this surface, creating a shadow at the bottom of the container. The camera captures changes in the shadow area, and combined with image analysis technology, high-resolution, high-speed measurement of minute normal forces is achieved. This method can achieve force measurement accuracy from piconewtons to nanonewtons, making it suitable for minute force testing in fields such as biomedicine, nanomaterials, and microelectromechanical systems. However, this system relies on the deformation characteristics and optical visibility of a specific transparent liquid medium, limiting its ability to measure normal forces on regular tray-like objects and making it difficult to accurately measure the force required to detach dandelion seeds.

[0004] In summary, current force measurement systems based on centrifugal motion and image analysis, with force sensors as the core component, cannot simultaneously meet the testing requirements for dandelion seed release forces at milli-micronewton levels and multiple angles in terms of testing accuracy, precision, and platform functionality. Therefore, it is necessary to develop a milli-micronewton level dandelion seed release force testing system with adjustable testing angles, featuring high testing accuracy and continuous adjustment of the testing angle from 0 to 90°. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a nano-micro Newton level dandelion seed release force testing system with adjustable testing angle. This system is specifically designed to test the multi-angle release force of dandelion seeds and features continuously adjustable testing angle, stable loading, and high force measurement accuracy, which can truly reflect the multi-angle release force of dandelion seeds.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a milli-micro Newton level dandelion seed detachment force testing system with adjustable testing angle, characterized in that it includes a test sample fixing platform and its rotation control component, a horizontal micro-motion platform, a lifting platform and its movement control component, a force sensor and its fixing component, and a test system base assembly; the test sample fixing platform and its rotation control component are installed on the horizontal micro-motion platform, the horizontal micro-motion platform is fixed on the lifting platform and its movement control component, and the lifting platform and its movement control component and the force sensor and its fixing component are all installed on the test system base assembly.

[0007] Further defining the above scheme, the test sample fixing platform and its rotation control components include a test sample fixing platform, a self-tightening three-jaw clamp, a shaft elastic retaining ring, a rotation angle scale, an angle pointer fixing bolt, an angle pointer, a reducer fixing bolt, a stepper motor fixing bolt, a stepper motor, a reducer, and a reducer output shaft; the test sample fixing platform is in the shape of an inverted L. The test sample fixing platform has a horizontal surface with a threaded mounting hole for a clamp and a vertical surface with a keyway hole. A self-tightening three-jaw clamp is installed in the threaded mounting hole. The reducer output shaft mates with the keyway hole and is fixed by a shaft retaining ring. A rotation angle scale is affixed to the bottom of the vertical surface of the test sample fixing platform. The reducer has a reducer input end, a reducer output end, an angle pointer mounting hole, and a semi-open mounting hole. The angle pointer is installed in the angle pointer mounting hole by an angle pointer fixing bolt and mates with the rotation angle scale. A stepper motor is installed in the reducer input end by a stepper motor fixing bolt. The reducer is connected to the horizontal micro-slider by a reducer fixing bolt passing through the semi-open mounting hole. The reducer output shaft mates with the reducer output end to drive the test sample fixing platform to rotate.

[0008] Further defining the above scheme, the horizontal micro-motion platform includes a horizontal micro-motion slider, a micro-motion knob, and a horizontal micro-motion platform base; the horizontal micro-motion slider is connected to a reducer; the micro-motion knob is installed on the top of the horizontal micro-motion platform base and is used to drive the horizontal micro-motion slider to achieve fine adjustment of horizontal displacement; the horizontal micro-motion platform base is fixedly installed on the lifting platform.

[0009] Further defining the above solution, the lifting platform and its movement control components include a lifting platform, a lifting platform stepper motor, stepper motor fixing bolts, a motor fixing bracket, a coupling, a ball screw, a slider, lifting platform fixing bolts, rolling bearings, bearing fixing brackets, a guide rail, a right-angle connector, a base fixing bolt, a movement control component base, and a bearing fixing seat; the lifting platform is provided with a lifting platform groove, lifting platform bolt holes, and lifting platform bolt slots, wherein the lifting platform groove is fitted into the slider; the slider is provided with a slider mounting hole, and the lifting platform fixing bolt is placed in the lifting platform bolt slot and passes through the lifting platform bolt hole. The lifting platform is fixed with the slider mounting holes; the lifting platform stepper motor has a stepper motor output shaft, which is installed on the motor mounting bracket by stepper motor fixing bolts; the two ends of the coupling are respectively connected to the stepper motor output shaft and the ball screw; the two ends of the ball screw are respectively fitted with rolling bearings and installed between the bearing fixing bracket and the bearing fixing seat, and the bearing fixing bracket and the bearing fixing seat are installed on the base of the motion control component by bolts; the slider simultaneously fits with the ball screw and the guide rail, and the guide rail is fixed to the base of the motion control component by bolts; the base of the motion control component is fixed to the base of the test system by the base fixing bolts and the right angle connector.

[0010] To further define the above scheme, the lifting platform moves vertically upward and downward under the drive of the lifting platform stepper motor, ball screw and slider.

[0011] Further defining the above scheme, the force sensor and its fixing components include a force sensor, a horizontal frame, sensor mounting bolts, a vertical frame, a right-angle connector between the frame and the base, a right-angle connector between the frame and the base, and a pressure wire bolt; the force sensor has mounting holes and pressure wire bolt holes; the horizontal frame has mounting through holes; the horizontal frame and the vertical frame are fixedly connected by the right-angle connector between the frame and the base; the vertical frame is fixed to the base of the testing system by the right-angle connector between the frame and the base; the force sensor is fixed to the horizontal frame by the sensor mounting bolts passing through the mounting holes and the mounting through holes; the pressure wire bolts are installed in the pressure wire bolt holes, and the bottom of the pressure wire bolts has nylon threads for connecting the force sensor and the dandelion sample.

[0012] Further defining the above solution, the test system base assembly includes a test system base and test system feet; the test system base is provided with test system corner threaded mounting holes at its four corners, and the test system feet are correspondingly installed in the test system corner threaded mounting holes.

[0013] The beneficial effects of adopting the above technical solution are as follows: This invention provides a nano-micro Newton level dandelion seed release force testing system with continuously adjustable test angle. The system uses a high-precision strain gauge force sensor as the core component and a nylon wire to connect the strain gauge force sensor and the dandelion seed (the top of the thin rod). The test sample fixing platform realizes reliable clamping of the dandelion seed and precise adjustment of the release angle. A horizontal micro-motion platform is set to compensate for the horizontal offset caused by the rotation of the test sample, ensuring that the release force is always applied in the vertical direction. The lifting platform is driven to descend at a constant rate. The tensioned nylon wire applies the release force to the dandelion seed. The strain gauge force sensor outputs a voltage signal synchronously. The data acquisition card converts the signal into a digital signal and transmits it to the host computer. The data processing and interface display program converts the output digital signal into the corresponding release force and displays the data in real time in the form of a curve on the interface window and stores it in the form of coordinate points. This provides technical and methodological references for multi-angle characterization of dandelion seed release characteristics and can also promote the biomimetic development of new controllable locking / releasing mechanisms. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall structure of the present invention;

[0015] Figure 2 Exploded view of the test sample fixing platform and its rotation control component assembly of the present invention;

[0016] Figure 3 Axonometric view of the horizontal micro-motion platform of the present invention;

[0017] Figure 4 Exploded view of the lifting platform movement control assembly of the present invention;

[0018] Figure 5 Schematic diagram of the lifting platform of the present invention;

[0019] Figure 6 Exploded view of the force sensor and its fixing assembly of the present invention;

[0020] Figure 7 Schematic diagram of the force sensor of the present invention;

[0021] Figure 8 Axonometric view of the test system base assembly of the present invention;

[0022] Figure 9 Functional flowchart of the present invention;

[0023] Figure 10 Physical diagram of the overall structure of the present invention;

[0024] In the diagram: 1. Test sample fixing platform and its rotation control components; 1-1. Test sample fixing platform; 1-1-1. Fixture threaded mounting hole; 1-1-2. Keyway hole; 1-2. Self-tightening three-jaw clamp; 1-3. Shaft elastic retaining ring; 1-4. Rotation angle scale; 1-5. Angle pointer fixing bolt; 1-6. Angle pointer; 1-7. Reducer fixing bolt; 1-8. Stepper motor fixing bolt; 1-9. Stepper motor; 1-10. Reducer; 1-10-1. Reducer input end; 1-10-2. Reducer output end; 1-10-3. Angle pointer mounting hole; 1-10-4. Semi-open mounting hole; 1-11. Reducer output shaft; 2. Horizontal micro-motion platform; 2-1. Horizontal micro-motion slider; 2-2. Micro-motion knob; 2-3. Horizontal micro-motion platform base; 3. Lifting platform and its movement control components; 3-1. Lifting platform; 3-1-1. Lifting platform groove; 3-1-2. Lifting platform bolt hole; 3-1-3. Lifting platform bolt slot; 3-2. Lifting platform stepper motor; 3-2-1. Stepper motor output shaft; 3-3. Stepper motor fixing bolt; 3-4. Motor fixing bracket; 3-5. Coupling; 3-6. Ball screw; 3-7. Slider; 3-7-1. Slider mounting hole; 3-8. Lifting platform fixing bolt; 3-9. Rolling bearing; 3-10. Bearing fixing bracket; 3-11 Guide rail; 3-12 Right-angle connector; 3-13 Base fixing bolt; 3-14 Motion control component base; 3-15 Bearing fixing seat; 4. Force sensor and its fixing components; 4-1 Force sensor; 4-1-1 Mounting hole; 4-1-2 Wire bolt hole; 4-2 Horizontal frame; 4-2-1 Mounting through hole; 4-3 Sensor mounting bolt; 4-4 Vertical frame; 4-5 Right-angle connector between frame and base; 4-6 Right-angle connector between frame; 4-7 Wire bolt; 5. Test system base assembly; 5-1 Test system base; 5-1-1 Test system bottom angle threaded mounting hole; 5-2 Test system feet; Detailed Implementation

[0025] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0026] According to the appendix Figure 1 It is understood that the present invention is specifically a milli-micro Newton level dandelion seed detachment force testing system with adjustable testing angle, mainly including a test sample fixing platform and its rotation control component 1, a horizontal micro-motion platform 2, a lifting platform and its movement control component 3, a force sensor and its fixing component 4, and a test system base component 5.

[0027] like Figure 1 , Figure 2As shown, the test sample fixing platform and its rotation control assembly 1 consist of a test sample fixing platform 1-1, a self-tightening three-jaw clamp 1-2, a shaft elastic retaining ring 1-3, a rotation angle scale 1-4, an angle pointer fixing bolt 1-5, an angle pointer 1-6, a reducer fixing bolt 1-7, a stepper motor fixing bolt 1-8, a stepper motor 1-9, a reducer 1-10, and a reducer output shaft 1-11. The test sample fixing platform 1-1 is inverted L-shape. A clamp threaded mounting hole 1-1-1 is provided on the horizontal surface of the test sample fixing platform 1-1 for mounting the self-tightening three-jaw clamp 1-2 to clamp the sample. A keyway hole 1-1-2 is provided on the vertical surface of the test sample fixing platform 1-1, which mates with the reducer output shaft 1-11 for torque transmission. The shaft elastic retaining ring is fitted and clamped onto the reducer output shaft 1-11 (1-3) to achieve axial fixation of the test sample fixing platform 1-1. Stepper motor 1-9 is connected to the input end 1-10-1 of the reducer via stepper motor fixing bolt 1-8. The output end 1-10-2 of the reducer is fastened to the output shaft 1-11 of the reducer to drive the test sample fixing platform 1-1 to rotate smoothly. Angle pointer 1-6 is installed in the angle pointer mounting hole 1-10-3 in the lower part of the reducer 1-10 via angle pointer fixing bolt 1-5, and points to the rotation angle scale 1-4 pasted on the vertical surface of the test sample fixing platform 1-1, for precise control of the rotation angle of the test sample fixing platform 1-1. Reducer fixing bolt 1-7 is fitted with the semi-open mounting hole 1-10-4 at the bottom of the reducer 1-10 to fix the reducer 1-10 on the horizontal micro-motion slider 2-1. When conducting the multi-angle detachment force test of dandelion seeds, the test sample fixing platform 1-1 is clamped and fixed with a self-tightening three-jaw clamp 1-2. The test sample fixing platform 1-1 is driven to rotate by a stepper motor 1-9, a reducer 1-10, and a reducer output shaft 1-11. The rotation angle scale 1-4 and the angle pointer 1-6 provide real-time indication to obtain the detachment angle information of the dandelion sample.

[0028] like Figure 1 , Figure 3 As shown, the horizontal micro-motion platform 2 consists of a horizontal micro-motion slider 2-1, a micro-motion knob 2-2, and a horizontal micro-motion platform base 2-3. The horizontal micro-motion slider 2-1 is fixedly connected to the reducer 1-10, the micro-motion knob 2-2 is mounted on the top of the horizontal micro-motion platform base 2-3, and the horizontal micro-motion platform base 2-3 is fixedly mounted on the lifting platform 3-1. Because the dandelion sample will shift horizontally during the rotation of the test sample fixing platform 1-1, the horizontal micro-motion platform 2 is set to compensate for this shift in real time to ensure that the detachment force of the dandelion seeds is always applied in the vertical direction.

[0029] like Figure 1 , Figure 4 , Figure 5As shown, the lifting platform and its movement control component 3 consist of a lifting platform 3-1, a lifting platform stepper motor 3-2, a stepper motor output shaft 3-2-1, a stepper motor fixing bolt 3-3, a motor fixing bracket 3-4, a coupling 3-5, a ball screw 3-6, a slider 3-7, a slider mounting hole 3-7-1, a lifting platform fixing bolt 3-8, a rolling bearing 3-9, a bearing fixing bracket 3-10, a guide rail 3-11, a right-angle connector 3-12, a base fixing bolt 3-13, a movement control component base 3-14, and a bearing fixing seat 3-15. The lifting platform 3-1 is U-shaped and has a lowering platform groove 3-1-1, a lifting platform bolt hole 3-1-2, and a lifting platform bolt slot 3-1-3. The lifting platform groove 3-1-1 is vertically fitted onto the slider 3-7. The lifting platform fixing bolt 3-8 is placed in the lifting platform bolt slot 3-1-3 and passes through the lifting platform bolt hole 3-1-2 and the slider mounting hole 3-7-1 to achieve a tight connection between the lifting platform 3-1 and the slider 3-7. The lifting platform stepper motor 3-2 is mounted on the motor fixing bracket 3-4 via the stepper motor fixing bolt 3-3. The coupling 3-5 connects the stepper motor output shaft 3-2-1 and the ball screw 3-6 to achieve synchronous power transmission and coaxial centering, ensuring that the stepper motor driving force is smoothly and without backlash transmitted to the ball screw 3-6. The ball screw 3-6 is installed between the bearing fixing bracket 3-10 and the bearing fixing seat 3-15. The bearing fixing bracket 3-10 and the bearing fixing seat 3-15 cooperate with the rolling bearing 3-9 and are fixed to the motion control component base 3-14. The slider 3-7 cooperates with both the ball screw 3-6 and the guide rail 3-11, which is fixed to the motion control component base 3-14. The motion control component base 3-14 is vertically installed on the test system base 5-1 via the base fixing bolt 3-13 and the right-angle connector 3-12. During the multi-angle detachment force test of dandelion seeds, the stepper motor 3-2 of the lifting platform drives the ball screw 3-6 to rotate at a constant speed, causing the slider 3-7, the lifting platform 3-1, and the test sample fixing platform 1-1 to descend at a uniform speed, thus tensioning the nylon thread connecting the dandelion sample and the force sensor 4-1 to apply the detachment force of the dandelion seeds.

[0030] like Figure 1 , Figure 6 , Figure 7As shown, the force sensor and its fixing assembly 4 consist of a force sensor 4-1, a horizontal frame 4-2, a sensor mounting bolt 4-3, a vertical frame 4-4, a right-angle connector between the frame and the base 4-5, a right-angle connector between the frame and the base 4-6, and a wire clamping bolt 4-7. The force sensor 4-1 in the force sensor and its fixing assembly 4 is used to sense and accurately collect the detachment force generated during the detachment of dandelion seeds. The sensor mounting bolt 4-3 passes through the mounting hole 4-1-1 and the mounting through hole 4-2-1 to fix the force sensor 4-1 to the horizontal frame 4-2. The bottom of the force sensor 4-1 has a wire clamping bolt hole 4-1-2, which, together with the wire clamping bolt 4-7, clamps the nylon thread, achieving a flexible connection between the dandelion sample and the force sensor 4-1 and a stable transmission of the detachment force. The horizontal frame 4-2 and the vertical frame 4-4 are connected by the frame right-angle connector 4-6; the vertical frame 4-4 is fixed on the test system base 5-1 by the frame and base right-angle connector 4-5 to form a stable rigid support structure, ensuring that the sensor does not shake or shift during the force measurement process, and ensuring that the release force test data is accurate and reliable.

[0031] like Figure 1 , Figure 8 As shown, the test system base assembly 5 consists of a test system base 5-1, test system feet 5-2, etc. The test system feet 5-2 are distributed at the four corners of the test system base 5-1. The threaded mounting holes 5-1-1 at the test system feet 5-2 are threaded together to ensure the horizontal stability of the test system.

[0032] The working process of a nano-micro Newton level dandelion seed release force testing system with adjustable testing angle, as described below with reference to the accompanying drawings, is described in detail below, using dandelion as the test object in the embodiment of the present invention.

[0033] like Figure 1 , Figure 2 , Figure 6 , Figure 8As shown, the test system base 5-1 serves as the support platform for the test system, featuring high rigidity and stability. The base 5-1 is 460.0 mm long, 180.0 mm wide, and 10.0 mm thick, and is used to house the lifting platform and its movement control component 3, the force sensor and its fixing component 4, etc. A nano-micro Newton level dandelion seed detachment force testing system with adjustable testing angle comprises, as its core components, a test sample fixing platform and its rotation control component 1, and a force sensor and its fixing component 4. The test sample fixing platform 1-1 is inverted L-shaped and made of 6061 aluminum alloy. Its horizontal surface dimensions are 80.0 mm long, 70.0 mm wide, and 6.0 mm thick. It has an 18.0 mm diameter threaded mounting hole 1-1-1 for mounting a self-tightening three-jaw clamp 1-2. Its vertical surface is circular, with a radius of 40.0 mm and a thickness of 10.0 mm. It has a 14.0 mm diameter keyway hole 1-1-2 for engaging with the reducer output shaft 1-11 to transmit torque, and is axially fixed by a shaft elastic retaining ring 1-3. A rotation angle scale 1-4 with a range of 180° and a graduation of 1° is affixed to the bottom of the test sample fixing platform 1-1. An angle pointer 1-6 is mounted on the lower part of the reducer 1-10 via an M6×12 angle pointer fixing bolt 1-5, which, in conjunction with the rotation angle scale 1-4, allows for precise reading of the rotation angle. Stepper motor 1-9 is connected to the input end of reducer 1-10-1 via M4×14 stepper motor fixing bolt 1-8. Reducer 1-10 has a semi-open mounting hole 1-10-4 with a diameter of 6.0 mm at the bottom and is mounted on horizontal micro slider 2-1 via M6×12 reducer fixing bolt 1-7.

[0034] like Figure 1 , Figure 3 As shown, the horizontal micro-motion platform 2 is 110.0 mm long, 60.0 mm wide, and 34.0 mm high, and includes a horizontal micro-motion slider 2-1, a micro-motion knob 2-2, and a horizontal micro-motion platform base 2-3. The horizontal micro-motion platform base 2-3 is fixedly mounted on the lifting platform 3-1 with bolts. The horizontal micro-motion slider 2-1 is fixedly connected to the reducer 1-10. The micro-motion knob 2-2 can drive the horizontal micro-motion slider 2-1 to achieve horizontal micro-motion adjustment. The adjustment stroke is 75.0 mm, and the adjustment accuracy is 0.01 mm, which is used to compensate for the horizontal offset caused by the rotation of the test sample and ensure that the release force is always applied in the vertical direction.

[0035] like Figure 1 , Figure 4 , Figure 5As shown, the lifting platform 3-1 is made of 6061 aluminum alloy, with dimensions of 220.0 mm in length, 170.0 mm in width, and 10.0 mm in thickness. The top has a lifting platform groove 3-1-1, with a width of 152.0 mm and a depth of 23.0 mm, for vertical mounting onto the slider 3-7. Below the platform groove 3-1-1, there are two lifting platform bolt holes 3-1-2 with a diameter of 6.0 mm and a lifting platform bolt slot 3-1-3 with a length of 30.0 mm and a width of 10.0 mm. M6×12 lifting platform fixing bolts 3-8 pass through the lifting platform bolt holes 3-1-2 and are fastened to the slider mounting holes 3-7-1. The stepper motor 3-2 of the lifting platform is mounted on the motor mounting bracket 3-4 via M4×14 stepper motor mounting bolts 3-3. The stepper motor output shaft 3-2-1 is connected to the ball screw 3-6 via coupling 3-5. The ball screw 3-6 has a diameter of 20.0 mm and a lead of 5.0 mm, and its two ends are supported between the bearing mounting bracket 3-10 and the bearing mounting seat 3-15, respectively. The bearing mounting bracket 3-10 and the bearing mounting seat 3-15 cooperate with the rolling bearing 3-9 and are fixed on the motion control component base 3-14. The slider 3-7 cooperates with both the ball screw 3-6 and the guide rail 3-11. The guide rail 3-11 has an effective stroke of 100.0 mm and is fixed to the motion control component base 3-14 with bolts. The mobile control component base 3-14 is vertically mounted on the test system base 5-1 via M6×10 base fixing bolts 3-13 and right-angle connectors 3-12, which can enable the lifting platform 3-1 to achieve vertical lifting movement at a constant speed of 1.0 mm / s.

[0036] like Figure 1 , Figure 6 , Figure 7As shown, both the horizontal frame 4-2 and the vertical frame 4-4 are made of 6061 aluminum alloy. The horizontal frame 4-2 is 200.0 mm long, 152.0 mm wide, and 10.0 mm thick, while the vertical frame 4-4 is 430.0 mm high, 152.0 mm wide, and 10.0 mm thick. The two are vertically fixedly connected by two frame right-angle connectors 4-6. The vertical frame 4-4 is fixedly mounted on the test system base 5-1 by two frame-to-base right-angle connectors 4-5, forming a rigid support structure to ensure no shaking or offset during force measurement. The horizontal frame 4-2 has two 3.0 mm diameter mounting holes 4-2-1, and the top of the force sensor 4-1 also has a 3.0 mm diameter mounting hole 4-1-1. The force sensor 4-1 is fixed by passing an M3×20 sensor mounting bolt 4-3 through the mounting holes 4-2-1 and 4-1-1. The force sensor 4-1 is a high-precision strain gauge sensor with a range of 980mN and a testing accuracy of 0.098mN. Its bottom is provided with a 3.0 mm diameter wire clamping bolt hole 4-1-2, which can be used with an M3×5 wire clamping bolt 4-7 to clamp a 60.0 μm diameter nylon wire to achieve a reliable connection between the dandelion sample and the force sensor 4-1 and a stable transmission of the separation force.

[0037] like Figure 1 , Figure 8 As shown, the test system base assembly 5 includes a test system base 5-1, test system bottom corner threaded mounting holes 5-1-1, and test system feet 5-2. The test system base 5-1 has four test system bottom corner threaded mounting holes 5-1-1, each with a diameter of 8.0 mm, which are threadedly connected to the four test system feet 5-2. The height adjustment range of the test system feet 5-2 is 0-10.0 mm, allowing adjustment of the overall level of the machine to ensure stable and reliable testing.

[0038] like Figure 9The diagram shows the functional flowchart of a nano-micro Newton level dandelion seed detachment force testing system with adjustable testing angle. The testing process for the multi-angle detachment force of dandelion seeds is described as follows: First, all functional components are installed on the testing system base 5-1, and the base 5-1 is leveled by adjusting the testing system feet 5-2. The dandelion seed sample is clamped and fixed by the self-tightening three-jaw clamp 1-2, and connected to the force sensor 4-1 by the pressure bolt 4-7 at the bottom using nylon thread. The stepper motor 1-9 is driven by the stepper motor controller, which drives the test sample fixing platform 1-1 to rotate via the reducer 1-10 and the reducer output shaft 1-11. The target detachment angle is read and set by the rotation angle scale 1-4 and the angle pointer 1-6. The horizontal micro-motion platform 2 compensates for the horizontal offset caused by the sample rotation, ensuring that the detachment force loading direction remains vertical. The lifting platform stepper motor 3-2 is started, driving the lifting platform 3-1 downward at a constant rate, gradually tensioning the nylon thread and applying a vertically upward detachment force to the dandelion seed. The force sensor 4-1 synchronously outputs a voltage signal, which is converted into a digital signal by the data acquisition card and transmitted to the host computer. The data processing and interface display program converts the digital signal into the corresponding release force value, which is displayed in the interface window as a real-time curve and stored and exported as coordinate points. Finally, the release force change curve and peak release force of dandelion seeds at a set angle are obtained.

[0039] like Figure 10 The image shown is a physical diagram of the overall structure of a milli-micro Newton level dandelion seed release force testing system with adjustable testing angle.

Claims

1. A nano-micro Newton level dandelion seed release force testing system with adjustable testing angle, characterized in that, The test sample fixing platform and its rotation control component (1), the horizontal micro-motion platform (2), the lifting platform and its movement control component (3), the force sensor and its fixing component (4), and the test system base assembly (5) are included. The test sample fixing platform and its rotation control component (1) are installed on the horizontal micro-motion platform (2), the horizontal micro-motion platform (2) is fixed on the lifting platform and its movement control component (3), and the lifting platform and its movement control component (3) and the force sensor and its fixing component (4) are all installed on the test system base assembly (5).

2. The nano-micro Newton level dandelion seed release force testing system with adjustable testing angle according to claim 1, characterized in that, The test sample fixing platform and its rotation control assembly (1) include a test sample fixing platform (1-1), a self-tightening three-jaw clamp (1-2), a shaft elastic retaining ring (1-3), a rotation angle scale (1-4), an angle pointer fixing bolt (1-5), an angle pointer (1-6), a reducer fixing bolt (1-7), a stepper motor fixing bolt (1-8), a stepper motor (1-9), a reducer (1-10), and a reducer output shaft (1-11). The test sample fixing platform (1-1) is inverted L-shaped, with a clamp thread mounting hole (1-1-1) on its horizontal surface and a keyway hole (1-1-2) on its vertical surface. The self-tightening three-jaw clamp (1-2) is installed in the clamp thread mounting hole (1-1-1). The reducer output shaft (1-11) mates with the keyway hole (1-1-2) and is fixed by the shaft elastic retaining ring (1-3). The rotation angle scale (1-4) is attached. The test sample fixing platform (1-1) is located at the bottom of its vertical surface. The reducer (1-10) has a reducer input end (1-10-1), a reducer output end (1-10-2), an angle pointer mounting hole (1-10-3), and a semi-open mounting hole (1-10-4). The angle pointer (1-6) is mounted in the angle pointer mounting hole (1-10-3) through the angle pointer fixing bolt (1-5) and cooperates with the rotation angle scale (1-4). The stepper motor (1-9) is mounted in the reducer input end (1-10-1) through the stepper motor fixing bolt (1-8). The reducer (1-10) is connected to the horizontal micro-motion slider (2-1) through the semi-open mounting hole (1-10-4) through the reducer fixing bolt (1-7). The reducer output shaft (1-11) is connected to the reducer output end (1-10-2) to drive the test sample fixing platform (1-1) to rotate.

3. The nano-micro Newton level dandelion seed release force testing system with adjustable testing angle according to claim 1, characterized in that, The horizontal micro-motion platform (2) includes a horizontal micro-motion slider (2-1), a micro-motion knob (2-2), and a horizontal micro-motion platform base (2-3); the horizontal micro-motion slider (2-1) is connected to a reducer (1-10); the micro-motion knob (2-2) is installed on the top of the horizontal micro-motion platform base (2-3) and is used to drive the horizontal micro-motion slider (2-1) to achieve fine adjustment of horizontal displacement; the horizontal micro-motion platform base (2-3) is fixedly installed on the lifting platform (3-1).

4. The nano-micro Newton level dandelion seed release force testing system with adjustable testing angle according to claim 1, characterized in that, The lifting platform and its movement control assembly (3) include a lifting platform (3-1), a lifting platform stepper motor (3-2), a stepper motor fixing bolt (3-3), a motor fixing bracket (3-4), a coupling (3-5), a ball screw (3-6), a slider (3-7), a lifting platform fixing bolt (3-8), a rolling bearing (3-9), a bearing fixing bracket (3-10), a guide rail (3-11), a right-angle connector (3-12), a base fixing bolt (3-13), and a movement control assembly base. The lifting platform (3-1) includes a seat (3-14) and a bearing fixing seat (3-15). The lifting platform (3-1) has a lifting platform groove (3-1-1), a lifting platform bolt hole (3-1-2), and a lifting platform bolt slot (3-1-3). The lifting platform groove (3-1-1) is fitted into the slider (3-7). The slider (3-7) has a slider mounting hole (3-7-1), and the lifting platform fixing bolt (3-8) is placed in the lifting platform bolt slot (3-1-3) and passes through the lifting platform bolt hole (3-1-2). The lifting platform (3-1) is fixed by the slider mounting hole (3-7-1); the lifting platform stepper motor (3-2) is equipped with a stepper motor output shaft (3-2-1) and is installed on the motor fixing bracket (3-4) by stepper motor fixing bolts (3-3); the coupling (3-5) connects the stepper motor output shaft (3-2-1) and the ball screw (3-6) at both ends respectively; the ball screw (3-6) is respectively fitted with rolling bearings (3-9) at both ends and installed on the bearing fixing bracket (3-10) and the bearing fixing bracket. Between the fixed seats (3-15), the bearing fixing bracket (3-10) and the bearing fixing seat (3-15) are bolted to the base of the moving control component (3-14); the slider (3-7) cooperates with the ball screw (3-6) and the guide rail (3-11), and the guide rail (3-11) is fixed to the base of the moving control component (3-14) by bolts; the base of the moving control component (3-14) is fixed to the base of the test system (5-1) by the base fixing bolt (3-13) and the right angle connector (3-12).

5. The nano-micro Newton level dandelion seed release force testing system with adjustable testing angle according to claim 4, characterized in that, The lifting platform (3-1) moves vertically up and down under the drive of the lifting platform stepper motor (3-2), ball screw (3-6) and slider (3-7).

6. The nano-micro Newton level dandelion seed release force testing system with adjustable testing angle according to claim 1, characterized in that, The force sensor and its fixing assembly (4) include a force sensor (4-1), a horizontal frame (4-2), sensor mounting bolts (4-3), a vertical frame (4-4), a right-angle connector between the frame and the base (4-5), a right-angle connector between the frame and the base (4-6), and a wire clamping bolt (4-7); the force sensor (4-1) is provided with a mounting hole (4-1-1) and a wire clamping bolt hole (4-1-2); the horizontal frame (4-2) is provided with a mounting through hole (4-2-1); the horizontal frame (4-2) and the vertical frame (4-4) are connected by a... The frame is fixedly connected by a right-angle connector (4-6); the vertical frame (4-4) is fixed to the test system base (5-1) by a right-angle connector (4-5) between the frame and the base; the force sensor (4-1) is fixed to the horizontal frame (4-2) by a sensor mounting bolt (4-3) passing through the mounting hole (4-1-1) and the mounting through hole (4-2-1); the wire clamping bolt (4-7) is installed in the wire clamping bolt hole (4-1-2), and the bottom of the wire clamping bolt (4-7) is provided with nylon wire for connecting the force sensor (4-1) and the dandelion sample.

7. The nano-micro Newton level dandelion seed release force testing system with adjustable testing angle according to claim 1, characterized in that, The test system base assembly (5) includes a test system base (5-1) and test system feet (5-2); the test system base (5-1) has test system bottom corner threaded mounting holes (5-1-1) at its four corners, and the test system feet (5-2) are installed in the test system bottom corner threaded mounting holes (5-1-1).

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