Simple branch variable frequency and variable amplitude vibration mechanism and its operation method

Abstract

The present invention discloses a simple branch variable frequency and variable amplitude vibration mechanism and an operation method thereof. The vibration structure includes five parts, namely a frame and a motor installed thereon, a swing mechanism, an amplitude adjustment mechanism, and a branch fixing mechanism. The present invention is mainly used in agricultural engineering to study the biomechanical properties of plant branches. Through the clever mechanical structure design, the rotational motion of the motor is finally transmitted to the test branch through various levels of transmission, so that the fixed end of the branch performs a simple harmonic vibration with a preset frequency and amplitude, thereby driving the vibration of the entire branch, so as to study the vibration attenuation characteristics of the branch.

Description

Technical Field

[0001] The invention relates to a biomechanical property research mechanism, specifically a mechanical structure for studying the biomechanical properties of branches and an operating method thereof, and more particularly to a simple branch variable frequency and variable amplitude vibration mechanism and an operating method thereof. Background Art

[0002] The branch vibration attenuation characteristic refers to the attenuation of vibration parameters such as amplitude and vibration frequency at a certain distance from the excitation after a vibration excitation is given at a certain part of the branch, that is, the attenuation of energy. Studying the vibration attenuation characteristics of branches can lay a theoretical foundation for the parameter design of vibration pickers for certain fruits and vegetables, and provide detailed data for the design of vibration pickers.

[0003] At present, the development of vibration mechanisms is clearly classified and very precise in terms of use. Different mechanisms are mainly designed for various different purposes, such as micro-oscillators used in experimental departments (pharmaceutical companies, medical institutions, health and epidemic prevention departments) and medical schools to prepare reagents or mix reagents and samples, oscillators used for agricultural product testing, test tube centrifugal oscillation devices used in chemical experiments, etc. These devices are almost all used in the fields of medicine, chemistry and construction machinery.

[0004] Disadvantages of existing vibration mechanisms: (1) Narrow application range. Existing vibration mechanisms are mainly used in medical, pharmaceutical and construction cement mixing and animal husbandry feed mixing. There is no vibration mechanism used in agricultural engineering to study the vibration attenuation characteristics of branches; (2) Existing vibration mechanisms have complex structures and limited functions; (3) Existing vibration mechanisms mostly use linear motors, which are expensive.

[0005] At present, there is no institution on the market that is specifically used to study the vibration attenuation characteristics of branches, and no similar implementation plan has been found.

[0006] In view of this, the present invention proposes a mechanical structure for studying the biomechanical properties of branches, and for studying the vibration attenuation characteristics of branches, that is, a vibration excitation is given at a certain position of the branch, and other equipment such as a high-speed camera is used to explore the vibration response at other positions of the branch, especially when the vibration frequency and amplitude of the vibration source are changed, whether the vibration attenuation characteristics of the branch will change. It is expected to be used to guide the design of certain agricultural machinery, such as: vibrating wolfberry picker, vibrating blueberry picker, etc. Summary of the invention

[0007] In view of the above problems, the present invention provides a simple variable frequency and variable amplitude branch vibration mechanism and an operating method thereof, which, together with other kinematic parameter testing equipment, are used in agricultural engineering to study the biomechanical properties of various branches.

[0008] The technical solution adopted by the present invention to solve the technical problem is:

[0009] The simple branch variable frequency and variable amplitude vibration mechanism includes a frame and a motor installed thereon, a swing mechanism, an amplitude adjustment mechanism, and a branch fixing mechanism, wherein

[0010] The swing mechanism comprises a flywheel and an annular slideway mounted on a frame, the flywheel is connected to the motor, a flywheel rotation guide groove is rotatably mounted on the flywheel, a rotating swing rod is mounted in the flywheel rotation guide groove, one end of the rotating swing rod is connected to a columnar slider, the columnar slider is arranged in the annular slideway, and the other end is connected to the amplitude adjustment mechanism;

[0011] The amplitude adjustment mechanism includes a swing rod rotating sleeve pin and an amplitude adjustment plate installed at the end of the rotating swing rod, and the swing rod rotating sleeve pin is rotatably installed on the frame through a rotating swing rod base;

[0012] The branch fixing mechanism is installed on the lower side of the amplitude adjustment plate and comprises a branch fixer and a branch locking nut.

[0013] As an improvement of the above technical solution, the motor is installed on the lower side of the frame and is connected to a frequency converter for driving the flywheel to rotate.

[0014] As an improvement of the above technical solution, the flywheel and the motor are connected via a thrust bearing.

[0015] As an improvement of the above technical solution, a rotary bearing is arranged between the flywheel rotation guide groove and the flywheel, and a rolling bearing is arranged between the columnar slider and the annular slideway.

[0016] As an improvement of the above technical solution, the amplitude adjustment mechanism includes an amplitude adjustment pin used in conjunction with an amplitude adjustment plate, and the amplitude adjustment plate is provided with a plurality of amplitude positioning holes, each of which represents a corresponding amplitude.

[0017] As an improvement of the above technical solution, a branch fixer fixing hole is provided at the front end of the amplitude adjustment plate, and the branch fixer is an annular sheet-shaped branch fixer, which is fixed to the amplitude adjustment plate by a fastening bolt and a fastening nut.

[0018] As an improvement of the above technical solution, a protrusion is provided at the bottom of the inner wall of the branch locking nut for pressing the clamping sheet of the annular sheet-shaped branch fixer.

[0019] The present invention also provides an operating method for a simple branch variable frequency and variable amplitude vibration mechanism, which is applied to any of the above-mentioned simple branch variable frequency and variable amplitude vibration mechanisms, and comprises:

[0020] First, determine the amplitude of the vibration source, adjust the amplitude adjustment plate to the specified position, and then fix it with the amplitude adjustment pin;

[0021] Secondly, unscrew the branch locking nut, insert the branch to be tested into the branch holder, and tighten the branch locking nut to complete the fixation of the branch to be tested;

[0022] Finally, turn on the power supply and adjust the frequency converter to the preset frequency to study the vibration attenuation characteristics of the branches.

[0023] The beneficial effects brought by the present invention are:

[0024] The present invention is mainly used in agricultural engineering to study the biomechanical properties of plant branches. Through the clever mechanical structure design, the rotational motion of the motor is transmitted to the test branch through various levels of transmission, so that the fixed end of the branch performs simple harmonic vibration with a preset frequency and amplitude, thereby driving the vibration of the entire branch, so as to study the vibration attenuation characteristics of the branch.

[0025] Compared with the existing vibration mechanism, the present invention has the following advantages:

[0026] 1. Wide application range. The vibration mechanism of the present invention can be used to study the biomechanical characteristics of branches in agricultural engineering. Existing vibration mechanisms are mainly used in the medical industry, construction industry and animal husbandry industry. The present invention can not only be applied to the above industries, but also solve the problem of studying the vibration attenuation characteristics of branches in agricultural engineering;

[0027] 2. Low manufacturing cost. Existing vibration mechanisms mostly use linear motors, which are expensive, while the invention uses AC variable frequency speed regulating motors, which are cheaper than linear motors, and are easy to maintain and durable;

[0028] 3. Easy and convenient operation: The invention is easy and convenient to operate in terms of fixing branches and adjusting amplitude and frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Attached Figure 1 is a top view of the structure of the vibration mechanism of the present invention;

[0031] Attached Figure 2 It is a structural side view of the vibration mechanism of the present invention;

[0032] Attached Figure 3 is a structural sectional view of the vibration mechanism of the present invention;

[0033] Attached Figure 4 is a three-dimensional diagram of the vibration mechanism of the present invention;

[0034] The structures corresponding to the numbers in the figure are:

[0035] 1 frame; 2 motor; 31 flywheel; 32 annular slideway; 33 flywheel rotation guide groove; 34 rotating swing rod; 35 columnar slider; 41 swing rod rotation sleeve pin; 42 amplitude adjustment sheet; 43 amplitude adjustment pin; 44 rotating swing rod base; 51 branch fixer; 52 branch locking nut. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings. The specific embodiments of the present invention described in the accompanying drawings are only for illustrating the present invention, and are not strictly drawn according to actual sizes and proportions. Therefore, the drawings in the present invention should not be interpreted as any limitation to the present invention. The scope of protection of the present invention is defined by the claims.

[0037] For the sake of simplicity and highlighting the present invention, only details particularly related to the present invention are shown in some drawings. It should be understood that this diagrammatic representation does not exclude the existence of other details related to the present invention. Therefore, the drawings of the present invention are not intended to limit the scope of the present invention.

[0038] Example 1

[0039] Reference Figures 1 to 4 The simple branch variable frequency and variable amplitude vibration mechanism comprises a frame 1 and a motor 2 mounted thereon, a swing mechanism, an amplitude adjustment mechanism, and a branch fixing mechanism, wherein

[0040] The motor 2 is installed on the lower side of the frame 1 and is connected to a frequency converter for driving the flywheel 31 to rotate. The flywheel 31 and the motor 2 are connected via a thrust bearing.

[0041] The swing mechanism includes a flywheel 31 and an annular slideway 32 mounted on the frame 1. The flywheel 31 is connected to the motor 2, on which a flywheel rotation guide groove 33 is rotatably mounted. A rotating swing rod 34 is mounted in the flywheel rotation guide groove 33. One end of the rotating swing rod 34 is connected to a columnar slider 35. The columnar slider 35 is arranged in the annular slideway 32, and the other end is connected to the amplitude adjustment mechanism. In order to reduce the friction resistance during the movement, a rotating bearing is arranged between the flywheel rotation guide groove 33 and the flywheel 31, and a rolling bearing is arranged between the columnar slider 35 and the annular slideway 32.

[0042] The swing mechanism is an evolved crank slider mechanism. To overcome the shortcoming of the crank slider mechanism having a dead angle during operation, the present invention uses a flywheel 31 to replace the crank. When the mechanism runs to the dead point, the flywheel 31 relies on the inertia to rush through the dead point.

[0043] In order to reduce the amplitude of the vibration mechanism, the present invention utilizes the principle of lever to reduce the large amplitude motion of the slider into the small amplitude motion of the annular sheet-shaped branch holder 51 .

[0044] The amplitude adjustment mechanism includes a swing rod rotating sleeve pin 41 and an amplitude adjustment plate 42 installed at the end of the rotating swing rod 34. The swing rod rotating sleeve pin 41 is rotatably installed on the frame 1 through a rotating swing rod base 44. The swing rod rotating sleeve pin 41 rotates around the rotating swing rod base 44 fixed on the plate-shaped frame 1, which is the rotation center of the rectangular rotating swing rod 34 and also the fulcrum for greatly reducing the amplitude according to the lever principle.

[0045] The amplitude adjustment mechanism includes an amplitude adjustment pin 43 used in conjunction with the amplitude adjustment sheet 42. The amplitude adjustment sheet 42 is provided with a plurality of amplitude positioning holes, each of which represents a corresponding amplitude. When the amplitude of the branch needs to be adjusted, it is only necessary to pull out the amplitude adjustment pin 43 and adjust the specified amplitude positioning hole to the specified position.

[0046] The branch fixing mechanism is installed on the lower side of the amplitude adjustment plate 42, and includes a branch fixer 51 and a branch locking nut 52. A fixing hole for the branch fixer 51 is provided at the front end of the amplitude adjustment plate 42. The branch fixer 51 is an annular sheet-shaped branch fixer 51, which is fixed to the amplitude adjustment plate 42 by a fastening bolt and a fastening nut.

[0047] When working, first insert the branch into the annular sheet-shaped branch holder 51, and then rotate the branch locking nut 52 to fasten the branch to the branch holder 51. The branch holder 51 is composed of three clamping pieces distributed at 120 degrees on the circumference. When tightening the branch locking nut 52, a protrusion is provided at the bottom of the inner wall of the branch locking nut 52 for pressing the clamping piece of the annular sheet-shaped branch holder 51.

[0048] The main improvements of this device are:

[0049] (1) Adjustable frequency. This invention is mainly used in agricultural engineering to study the biomechanical properties of plant branches, explore the vibration attenuation characteristics of various plant branches, and provide theoretical design and related data for the design of related agricultural machinery. In this invention, the adjustment of the vibration frequency is mainly achieved by the frequency converter, and the vibration frequency of the branches is controlled by adjusting the frequency converter;

[0050] (2) Amplitude can be adjusted. Studying the amplitude attenuation of branches is an important part of branch vibration attenuation. The present invention designs a simple amplitude adjustment mechanism that is easy and convenient to operate;

[0051] (3) The lever principle greatly reduces the amplitude. The present invention utilizes the lever principle to convert the large amplitude of the columnar slider 35 into the small amplitude of the annular sheet-shaped branch holder 51, thereby meeting the requirement of "high frequency and low amplitude" in the branch vibration experiment;

[0052] (4) Ring-shaped branch fixing mechanism. In order to fix the branches, this embodiment designs a ring-shaped branch fixing mechanism, which can fasten the branches by rotating the branch locking nut 52, and is easy to operate.

[0053] Example 2

[0054] An operating method of a simple branch variable frequency and variable amplitude vibration mechanism, the method is applied to the simple branch variable frequency and variable amplitude vibration mechanism in embodiment 1, and comprises

[0055] First, determine the amplitude of the vibration source, adjust the amplitude adjustment sheet 42 to the specified position, and then fix it with the amplitude adjustment pin 43;

[0056] Next, unscrew the branch locking nut 52, insert the branch to be tested into the sheet-like branch holder 51, and tighten the branch locking nut 52 to complete the fixation of the branch to be tested;

[0057] Finally, turn on the power supply and adjust the frequency converter to the preset frequency to study the vibration attenuation characteristics of the branches.

[0058] The above is a detailed description of the specific embodiments of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. Simple branch variable frequency and variable amplitude vibration mechanism, characterized by: It includes a frame and a motor, a swing mechanism, an amplitude adjustment mechanism, and a branch fixing mechanism installed thereon, wherein The swing mechanism comprises a flywheel and an annular slideway mounted on a frame, the flywheel is connected to the motor, a flywheel rotation guide groove is rotatably mounted on the flywheel, a rotating swing rod is mounted in the flywheel rotation guide groove, one end of the rotating swing rod is connected to a columnar slider, the columnar slider is arranged in the annular slideway, and the other end is connected to the amplitude adjustment mechanism; a rotating bearing is arranged between the flywheel rotation guide groove and the flywheel, and a rolling bearing is arranged between the columnar slider and the annular slideway; The amplitude adjustment mechanism includes a swing rod rotating sleeve pin and an amplitude adjustment plate installed at the end of the rotating swing rod. The swing rod rotating sleeve pin is rotatably installed on the frame through a rotating swing rod base. It is the rotation center of the rotating swing rod and also the fulcrum for reducing the amplitude according to the lever principle. The amplitude adjustment mechanism includes an amplitude adjustment pin used in conjunction with the amplitude adjustment plate. The amplitude adjustment plate is provided with a plurality of amplitude positioning holes, and each amplitude positioning hole represents a corresponding amplitude. The branch fixing mechanism is installed on the lower side of the amplitude adjustment plate, and includes a branch fixer and a branch locking nut; The vibration mechanism utilizes the lever principle to convert the large amplitude of the columnar slider into the small amplitude of the branch holder, thereby meeting the requirement of 'high frequency and low amplitude' of the branch vibration experiment.

2. The simple branch variable frequency and variable amplitude vibration mechanism according to claim 1 is characterized in that: The motor is installed on the lower side of the frame and is connected to a frequency converter for driving the flywheel to rotate.

3. The simple branch variable frequency and variable amplitude vibration mechanism according to claim 2 is characterized in that: The flywheel and the motor are connected via a thrust bearing.

4. The simple branch variable frequency and variable amplitude vibration mechanism according to claim 1 is characterized in that: A branch fixer fixing hole is arranged at the front end of the amplitude adjustment sheet. The branch fixer is an annular sheet-shaped branch fixer, which is fixed on the amplitude adjustment sheet by a fastening bolt and a fastening nut.

5. The simple branch variable frequency and variable amplitude vibration mechanism according to claim 4 is characterized in that: A protrusion is arranged at the bottom of the inner wall of the branch locking nut, which is used to press the clamping sheet of the annular sheet-shaped branch fixer.

6. The operating method of the simple branch variable frequency and variable amplitude vibration mechanism is characterized by: The method is applied to the simple branch variable frequency and variable amplitude vibration mechanism described in claims 1 to 5, and comprises: First, determine the amplitude of the vibration source, adjust the amplitude adjustment plate to the specified position, and then fix it with the amplitude adjustment pin; Secondly, unscrew the branch locking nut, insert the branch to be tested into the branch holder, and tighten the branch locking nut to complete the fixation of the branch to be tested; Finally, turn on the power supply and adjust the frequency converter to the preset frequency to study the vibration attenuation characteristics of the branches.

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