Broadband particle damping vibration absorber for mini-tiller and control method of broadband particle damping vibration absorber

Abstract

The invention discloses a broadband particle damping vibration absorber for a mini-tiller and a control method of the broadband particle damping vibration absorber, and relates to the technical field of particle damping vibration absorbers, the broadband particle damping vibration absorber comprises a first cavity and a second cavity, the first cavity and the second cavity are detachably connected; the first cavity is filled with the damping particles; the flow guide plate is located in the first cavity, and the two ends of the flow guide plate are rotationally connected with the side wall of the first cavity through rotating shafts correspondingly; and the driving motor is fixed in the second cavity, and an output shaft of the driving motor is fixed to the rotating shaft at one end of the flow guide plate. The vibration frequency band of 5-500 Hz is covered through the cavity dividing design, and the vibration reduction rate is increased; the guide plate directionally guides the particles to move, so that energy dissipation is concentrated in the main vibration direction; the filling density of the telescopic cavity is directly adjusted through volume change, the structure is simplified, and the reliability is high; the wear rate is reduced through alumina ceramic particle and guide plate sand blasting treatment, and the maintenance period is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of particle damping absorbers, and particularly to a broadband particle damping absorber for a micro-tiller and its control method. Background Technique

[0002] A micro-tiller is a tillage machine powered by a small diesel engine or gasoline engine, with characteristics such as light weight, small size, and simple structure. Existing technical problems:

[0003] (1) Agricultural machinery generates a wide range of vibration frequency bands (low frequency to high frequency) under complex soil conditions (soft, hard, rocky), and traditional single particle dampers are difficult to cover the entire frequency band.

[0004] (2) Existing dampers lack the ability to adaptively adjust to the vibration direction, resulting in low energy dissipation efficiency.

[0005] (3) The particle filling density is fixed and cannot adapt to the variable working condition requirements in real time.

[0006] Therefore, we propose a broadband particle damping absorber for a micro-tiller and its control method. Summary of the Invention

[0007] The purpose of the present invention is to provide a broadband particle damping absorber for a micro-tiller and its control method to solve the problems raised in the above background technique.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A broadband particle damping absorber for a micro-tiller, characterized by comprising:

[0009] A first chamber and a second chamber, the first chamber and the second chamber are detachably connected;

[0010] Damping particles, the damping particles are filled in the first chamber;

[0011] A baffle plate, the baffle plate is located in the first chamber, and both ends of the baffle plate are rotatably connected to the side walls of the first chamber through rotating shafts;

[0012] A driving motor, the driving motor is fixed in the second chamber, and the output shaft of the driving motor is fixed to the rotating shaft at one end of the baffle plate.

[0013] Preferably, the first chamber is a low-frequency chamber, and the damping particles filled in the first chamber are lead-rubber composite particles.

[0014] Preferably, the structure of the lead-rubber composite particles is a lead core wrapped with a rubber layer, the thickness of the rubber layer is 3 mm, and the particle size of the lead-rubber composite particles is 8 - 12 mm.

[0015] Preferably, the first chamber is an intermediate-frequency chamber, and the damping particles filled in the first chamber are steel-copper mixed particles.

[0016] Preferably, in the steel-copper mixed particles, the proportion of steel particles is 60%, and the particle size of the steel particles is 3-5 mm; the proportion of copper particles is 40%, and the particle size of the copper particles is 1-3 mm.

[0017] Preferably, the first chamber is a high-frequency chamber, and the damping particles filled in the first chamber are alumina ceramic particles.

[0018] Preferably, the particle size of the alumina ceramic particles is 1 mm.

[0019] Preferably, the surface of the flow guide plate is subjected to sandblasting treatment.

[0020] Preferably, the first chamber adopts a stainless steel bellows structure and is driven to expand and contract by a stepping motor.

[0021] A control method for a broadband particle damping shock absorber for a micro-tiller, comprising the following steps:

[0022] S1. A sensor detects vibration signals, and the detection parameters include: acceleration in the x / y / z axis directions, vibration frequency, and amplitude;

[0023] S2. According to the main frequency component and direction proportion obtained by analysis, the corresponding frequency chambers are activated or used in combination;

[0024] S3. The flow guide plate is adjusted so that the inclination direction of the flow guide plate is orthogonal to the main vibration direction, thereby guiding and increasing the dissipation efficiency in a specific direction;

[0025] S4. According to the data model, the volume of the chamber is adjusted adaptively, the filling rate is changed, and then the entire adjustment process is completed;

[0026] S5. Feedback on the vibration suppression effect, the vibration attenuation situation is detected in real time through a sensor, the states of the chamber and the flow guide plate are changed dynamically, and then closed-loop control is achieved.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. Wide frequency coverage: The chamber division design covers the vibration frequency band of 5–500 Hz, and the vibration reduction rate is improved.

[0029] 2. Direction adaptability: The flow guide plate directionally guides the movement of particles, so that the energy dissipation is concentrated in the main vibration direction.

[0030] 3. Dynamic adjustment: The telescopic chamber directly adjusts the filling density through the volume change, with a simplified structure and high reliability.

[0031] 4. Long lifespan: Alumina ceramic particles and sandblasting treatment of the flow deflector reduce the wear rate and extend the maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the flow deflector of the present invention;

[0034] Figure 3 It is a schematic diagram of the structure of the tool of the present invention.

[0035] In the figure: 1. The first chamber; 2. The second chamber; 3. The flow deflector. DETAILED DESCRIPTION OF THE INVENTION

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1-3 , the present invention provides a technical solution: a broadband particle damping shock absorber for a micro-tiller, including:

[0038] The first chamber 1 and the second chamber 2, and the first chamber 1 and the second chamber 2 are detachably connected;

[0039] Damping particles, and the damping particles are filled in the first chamber 1;

[0040] The flow deflector 3, the flow deflector 3 is located in the first chamber 1, and both ends of the flow deflector 3 are respectively rotationally connected to the side walls of the first chamber 1 through rotating shafts;

[0041] The drive motor is fixed in the second chamber 2, and the output shaft of the drive motor is fixed to the rotating shaft at one end of the flow deflector 3, and the angle of the flow deflector 3 is adjusted by the rotation of the drive motor.

[0042] As a preferred embodiment, the first chamber 1 is a low-frequency chamber, and the damping particles filled in the first chamber 1 are lead-rubber composite particles.

[0043] The structure of the lead-rubber composite particle is that a lead core is wrapped with a rubber layer, the thickness of the rubber layer is 3 mm, and the particle size of the lead-rubber composite particle is 8-12 mm.

[0044] Energy dissipation mechanism: Combining the high density of lead and the damping characteristics of rubber, low-frequency energy < 30 Hz is dissipated through the momentum exchange of large-mass particles. At the same time, the rubber layer prevents direct contact between lead and the environment, making it safer.

[0045] As a preferred embodiment, the first chamber 1 is an intermediate-frequency chamber, and the damping particles filled in the first chamber 1 are steel-copper mixed particles.

[0046] In the steel-copper mixed particles, the proportion of steel particles is 60%, and the particle size of steel particles is 3 - 5 mm; the proportion of copper particles is 40%, and the particle size of copper particles is 1 - 3 mm.

[0047] Energy dissipation mechanism: Friction - collision coupling, steel particles provide hardness, and copper particles enhance damping at 30 - 100 Hz.

[0048] As a preferred embodiment, the first chamber 1 is a high-frequency chamber, and the damping particles filled in the first chamber 1 are alumina ceramic particles.

[0049] The particle size of the alumina ceramic particles is 1 mm.

[0050] Energy dissipation mechanism: High-frequency collision and surface friction, energy > 100 Hz is dissipated through the high contact frequency of small particles.

[0051] As a preferred embodiment, the surface of the flow guide plate 3 is sandblasted to increase the particle friction coefficient.

[0052] As a preferred embodiment, the first chamber 1 adopts a stainless steel bellows structure and is driven to expand and contract by a stepping motor.

[0053] This embodiment provides a control method for a broadband particle damping vibration absorber for a micro-tiller, including the following steps:

[0054] S1. The sensor detects vibration signals, and the detection parameters include: acceleration in the x / y / z axis directions, vibration frequency, and amplitude;

[0055] S2. According to the main frequency component and direction proportion obtained from the analysis, the corresponding frequency chamber is activated or combined for use;

[0056] S3. Adjust the flow guide plate 3, and make the inclination direction of the flow guide plate 3 orthogonal to the main vibration direction, so as to guide and increase the dissipation efficiency in a specific direction;

[0057] S4. According to the data model, adaptively adjust the chamber volume, change the filling rate, and then complete the entire adjustment process;

[0058] S5. Vibration suppression effect feedback. The vibration attenuation situation is detected in real time through sensors, and the states of the chamber and the flow guide plate 3 are dynamically changed, thereby realizing closed-loop control.

[0059] As a preferred implementation manner, this embodiment provides a method for controlling the direction of the flow guide plate 3:

[0060] (1) Structural design: Independent groups of flow guide plates 3 are arranged in each chamber, and the inclination angle can be adjusted from 0° to 60° by the drive of a motor. The surface of the flow guide plate 3 is sandblasted to increase the friction coefficient of the particles;

[0061] (2) Control logic: The sensor inputs, and the triaxial accelerometer detects the vibration frequencies in the X, Y, and Z directions in real time;

[0062] (3) Flow guiding strategy:

[0063] If the high-frequency vibration direction is the X direction → The flow guide plate 3 in the high-frequency chamber A inclines 5° perpendicular to the X direction to enhance the lateral collision of the particles;

[0064] If the low-frequency vibration direction is the Z direction → The flow guide plate 3 in the low-frequency chamber C inclines 30° perpendicular to the Z direction to guide the longitudinal impact of the particles.

[0065] As a preferred implementation manner, this embodiment provides a retractable chamber structure and a volume adjustment mechanism: The chamber adopts a stainless steel bellows structure, and the telescopic stroke is ±20 mm driven by a stepper motor, and the volume change range is 30% - 80%.

[0066] Filling density control: The particle filling rate is directly adjusted by changing the chamber volume. Filling rate = particle volume / chamber volume.

[0067] Control logic: The vibration sensor detects the main frequency → The controller calculates the target filling rate → The motor adjusts the length of the bellows.

[0068] As a preferred implementation manner, this embodiment provides an adaptive control system, and the hardware composition:

[0069] Sensors: Triaxial MEMS accelerometer with a sampling rate of 1 kHz, and a laser displacement sensor monitors the particle filling rate.

[0070] Actuators: Stepper motor for the angle of the flow guide plate 3 and the telescopic movement of the bellows.

[0071] Controller: Embedded ARM chip runs the algorithm.

[0072] Algorithm design:

[0073] 1. Frequency domain analysis: Extract the main frequency components in the X / Y / Z directions from the vibration signal.

[0074] 2. Parameter matching:

[0075] If the main frequency < 30 Hz → activate the low-frequency cavity C and adjust the direction of the flow deflector 3 and the filling rate

[0076] If the main frequency is 30–100 Hz → activate the medium-frequency cavity B and adjust the direction of the flow deflector 3 and the filling rate

[0077] If the main frequency > 100 Hz → activate the high-frequency cavity A and adjust the direction of the flow deflector 3 and the filling rate

[0078] 3. Real-time optimization: Dynamically adjust the angle of the flow deflector 3 and the chamber volume to minimize the vibration transmission rate.

[0079] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0080] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A broadband particle damping vibration absorber for a micro-tiller, characterized in that Comprising: A first chamber (1) and a second chamber (2), the first chamber (1) and the second chamber (2) being detachably connected; Damping particles, the damping particles being filled in the first chamber (1); A flow guiding plate (3), the flow guiding plate (3) being located in the first chamber (1), and both ends of the flow guiding plate (3) being rotatably connected to the side walls of the first chamber (1) through rotating shafts; A driving motor, the driving motor being fixed in the second chamber (2), and the output shaft of the driving motor being fixed to the rotating shaft at one end of the flow guiding plate (3).

2. The broadband particle damping vibration absorber for a micro-tiller according to claim 1, wherein: The first chamber (1) is a low-frequency chamber, and the damping particles filled in the first chamber (1) are lead-rubber composite particles.

3. The broadband particle damping vibration absorber for a micro-tiller according to claim 2, characterized in that: The structure of the lead-rubber composite particles is a lead core wrapped with a rubber layer, the thickness of the rubber layer is 3 mm, and the particle size of the lead-rubber composite particles is 8 - 12 mm.

4. A broadband particle damping vibration absorber for a micro-tiller according to claim 1, characterized in that: The first chamber (1) is a medium-frequency chamber, and the damping particles filled in the first chamber (1) are steel-copper mixed particles.

5. A broadband particle damping vibration absorber for a micro-tiller and its control method according to claim 4, characterized in that: In the steel-copper mixed particles, the proportion of steel particles is 60%, the particle size of the steel particles is 3 - 5 mm; the proportion of copper particles is 40%, and the particle size of the copper particles is 1 - 3 mm.

6. The broadband particle damping vibration absorber for a micro-tiller according to claim 1, characterized in that: The first chamber (1) is a high-frequency chamber, and the damping particles filled in the first chamber (1) are alumina ceramic particles.

7. The broadband particle damping vibration absorber for a micro-tiller according to claim 6, characterized in that: The particle size of the alumina ceramic particles is 1 mm.

8. A broadband particle damping vibration absorber for a micro-tiller according to claim 1, characterized in that: The surface of the flow guiding plate (3) is subjected to sandblasting treatment.

9. A broadband particle damping vibration absorber for a micro-tiller according to claim 1, characterized in that: The first chamber (1) adopts a stainless steel bellows structure and is driven to expand and contract by a stepping motor.

10. A control method for a broadband particle damping absorber of a micro-tiller, characterized in that, Including the following steps: S1. The sensor detects the vibration signal, and the detection parameters include: acceleration in the x / y / z axis directions, vibration frequency, and amplitude; S2. According to the main frequency component and direction proportion obtained by analysis, the corresponding frequency chamber is activated or combined for use; S3. The flow guiding plate (3) is adjusted, and the inclination direction of the flow guiding plate (3) is orthogonal to the main vibration direction, so as to guide and increase the dissipation efficiency in a specific direction; S4. According to the data model, the chamber volume is adaptively adjusted, the filling rate is changed, and then the entire adjustment process is completed; S5. The vibration suppression effect is feedback, the vibration attenuation situation is detected in real time through the sensor, the states of the chamber and the flow guiding plate (3) are dynamically changed, and then closed-loop control is realized.

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