Hierarchical Active Vibration Isolation Component Based on Voice Coil Motor Driven Periodic Dot Matrix Distribution

Abstract

The present invention provides a hierarchical active vibration isolation component based on a periodically dot-matrix distribution driven by a voice coil motor, which includes a bearing mechanism, an active control mechanism, a driving mechanism, and fixed damping and moving damping with dot-matrix distribution; the bearing mechanism includes an upper end cover, a fixed damping limit cover, a lower end cover, and a base; the upper end cover, the fixed damping limit cover, the lower end cover, and the base are coaxially arranged; the active control mechanism includes a control panel, a voice coil motor, a pressure sensor, and a sensing circuit; the voice coil motor and the pressure sensor are connected to the control panel; the driving mechanism includes a gear shaft, a first-stage driving plate, and a second-stage driving plate; the gear shaft, the first-stage driving plate, and the second-stage driving plate are coaxially arranged; the first-stage driving plate and the second driving plate are grooved circumferentially; applying this technical solution can control the vibration isolator to generate different damping changes in real time, so as to play a role in real-time control of external variable vibration sources and achieve the effect of active vibration isolation.

Description

Technical Field

[0001] The invention relates to the technical field of vibration isolation devices, in particular to a hierarchical active vibration isolation component based on a voice coil motor driven periodic dot matrix distribution. Background Art

[0002] With the continuous development of precision machining, aerospace, and ship technology, the complex vibration phenomena generated within the system have increasingly prominent adverse effects on the processing accuracy, measurement accuracy, and service life of the product. It is necessary to develop a vibration isolation system to limit these adverse vibration phenomena. Existing vibration isolation systems can be divided into two categories, namely passive vibration isolation and active vibration isolation. The traditional passive vibration isolation device is to add a damped vibration isolator to the control system to reduce the vibration of the system's natural frequency. This method can effectively overcome the influence of high-frequency vibration, but the ability to resist changes in the vibration source is weak, and specific vibration environments require special development. When used in precision mechanical structures, passive vibration isolation methods sometimes cannot effectively respond to tiny vibrations, which may cause serious damage to the entire system. Therefore, some active vibration isolation devices with advantages such as strong adaptability and fast response speed are widely used in precision structures. Active vibration isolation devices can control the drive mechanism to respond to different vibration environments through sensor signals, and adjust the damping and stiffness characteristics in real time. Currently, the commonly used active control mechanisms include piezoelectric actuators, pneumatic / hydraulic actuators, and magnetostrictive actuators. Some smart materials such as magnetorheological fluids and shape memory materials are also used in drive mechanisms. These actuators have high cost and poor stability, and it is difficult to ensure smooth operation in extreme environments. Active control itself also has some disadvantages, such as high hardware requirements, high energy consumption, high cost, and complex structure. In order to improve the vibration isolation performance of the structure, the research and development of active vibration isolation of intelligent structures has been increasingly valued.

[0003] The problems and defects of existing vibration isolation devices mainly include:

[0004] 1. Most of the existing vibration reduction devices are passive vibration isolation devices, with single performance and narrow adaptability. They can usually only work on vibrations in a certain frequency band and direction, and the vibration reduction effect is not good. In addition, the passively controlled vibration isolators are often insufficiently stiff, and the parameters cannot be adjusted in real time. Therefore, they are only suitable for high-frequency vibration occasions, and the vibration isolation effect of low-frequency vibration is poor. Moreover, under complex working conditions, there are multiple vibration superpositions and the amplitude and frequency are constantly changing. They are powerless against time-varying vibration sources, resulting in a single ordinary passive vibration reduction effect that cannot achieve the expected effect and can no longer meet the requirements and accuracy for effectively suppressing vibrations in the above-mentioned fields.

[0005] 2. Existing active vibration isolation devices have a good isolation effect on low-frequency vibration and can adjust the damping and stiffness in real time according to the changes of the vibration source. However, most of them are single-layer vibration isolation and cannot reduce the force transmission rate between mechanical equipment and the base like multi-layer vibration isolation. They have good vibration isolation effects in both high-frequency and low-frequency bands. Currently, the adjustment of active vibration isolation damping is usually directly controlled by an actuator, which has a great impact on the service life of the damping. Moreover, the control system design is complex, the production cost is high, and it cannot be widely applied.

[0006] 3. Existing active vibration isolation devices generally use piezoelectric actuators, pneumatic / hydraulic actuators, or magnetorheological fluids and shape memory alloys for driving. However, these methods have problems such as slow response speed, poor control accuracy, high usage cost, and poor stability in extreme environments, and cannot work stably for a long time. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a hierarchical active vibration isolation component based on a voice coil motor-driven periodic dot matrix distribution, which can control the isolator to generate different damping changes in real time, so as to play a role in real-time control of the external changing vibration source and achieve the effect of active vibration isolation.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions: A hierarchical active vibration isolation component based on a voice coil motor-driven periodic dot matrix distribution, including a bearing mechanism, an active control mechanism, a driving mechanism, and fixed damping and moving damping with dot matrix distribution; the bearing mechanism includes an upper end cover, a fixed damping limit cover, a lower end cover, and a base arranged in sequence from top to bottom; the upper end cover, the fixed damping limit cover, the lower end cover, and the base are coaxially arranged; the active control mechanism includes a control panel, a voice coil motor, a pressure sensor, and a sensing circuit; the voice coil motor and the pressure sensor are connected to the control panel through the sensing circuit; the driving mechanism includes a gear shaft, a first-level driving plate, and a second-level driving plate; the gear shaft, the first-level driving plate, and the second-level driving plate are coaxially arranged; the first-level driving plate and the second driving plate are grooved along the circumference;

[0009] It further includes a fixed damping limit disk and a sliding bearing chain. The fixed damping limit disk is arranged below the second-level driving plate and is coaxially arranged with the gear shaft; the axial direction where the gear shaft is located is the central axis; the gear shaft is connected to the voice coil motor; the sliding bearing chain is placed in the first-level driving plate, the second-level driving disk, and the fixed damping limit disk; the moving damping is placed between the first-level driving disk and the second-level driving disk, and the fixed damping is placed on both sides of the driving disk and is fixed by the fixed damping limit cover and the fixed damping limit disk.

[0010] In a preferred embodiment, the fixed damping and moving damping with periodic dot matrix distribution are initially distributed at 45°.

[0011] In a preferred embodiment, the gear shaft is connected to the voice coil motor and limited by a limit block, and the circumferential torque is transmitted in a gear contact manner.

[0012] In a preferred embodiment, an elastic washer is provided between the fixed damping limit cover and the upper end cover, and the middle two layers of fixed damping are cooperated and fixed through the elastic washer.

[0013] In a preferred embodiment, the lower end cover is coaxially fitted with the fixed damping limit cover and fixed to the base by bolts.

[0014] In a preferred embodiment, first, the equipment to be vibration-isolated is installed on the vibration isolation assembly. The upper end cover is connected to the equipment through the threaded posts extending from the end cover. The whole device is placed on a horizontal tabletop, and the bolts extending from the base play a fixing role. The moving damper, the first-stage drive disk, the second-stage drive disk, the sliding bearing chain, and the fixed damping limit disk form a moving platform. When external vibration occurs, the amplitude is transmitted to the pressure sensor through the upper end cover, the moving platform, and the fixed damping limit disk. The sensing device reads the real-time amplitude and frequency changes and feeds this value back to the active control program module in the control panel through the sensing line. After identification and calculation, a control signal is given and transmitted to the voice coil motor to drive the voice coil motor to rotate, driving the gear shaft to rotate a certain angle, so that the engaged drive disk rotates a certain angle with the assistance of the sliding bearing chain and lubricating oil, and then drives the rotation of the moving damper. The damping distribution of each layer is four, and the moving damper and the fixed damping are distributed at a 45° angle. When the moving platform rotates, the angle between the moving damper and the fixed damping changes, and the change range is 45° to 0°. It is found that when the moving platform rotates one week, the angle change between the fixed damping and the moving damping is 45° to 0° to 45° to 0°, showing an obvious periodic change. That is, this vibration isolation device can dynamically adjust the stiffness change periodically. When the external vibration source changes, the pressure sensor reads the changes in amplitude and frequency in real time, and adjusts the distribution form of the damping in real time through the algorithm, so as to isolate the vibration in different frequency vibration environments.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention adopts the cooperative action mode of the pressure sensor and the active control program, further transforms the read pressure change trend into the output instruction of the active control program, and controls the vibration isolator to generate different damping changes in real time, so as to play a role in real-time control of the external changing vibration source and achieve the effect of active vibration isolation. Compared with the traditional actuator drive mode, through the cooperation of the pressure sensor, the control program, the control line, and the voice coil motor this time, it can not only react quickly and actively isolate vibration in a complex vibration environment, but also be safe, stable, highly reliable, and low-cost.

[0017] The present invention adopts a damping arrangement form with a periodically variable dot matrix distribution, avoiding the existing active vibration isolation method that uses an actuator for driving. Limited by the driving ability of the actuator, it generally has a good vibration isolation effect only in the low-frequency band, and the frequency band is small. However, the dot matrix distribution form of the present invention can not only achieve vibration isolation in the low-frequency band, but also further achieve vibration isolation in the high-frequency band with the periodic rotation of the dynamic damping. Moreover, it can further change the vibration isolation frequency band by changing the damping material, so as to achieve the real-time vibration isolation control effect in most frequency bands in the engineering field.

[0018] The dynamic damping driving method adopted by the present invention is the gear shaft driving method. Different from the traditional actuator driving method, the gear meshing driving method has higher control accuracy and better running stability, and can achieve a more precise vibration isolation effect. Using the connection method of a sliding bearing chain and lubricating oil not only has better load-bearing capacity, but also can greatly reduce the force required for gear shaft driving and play a role in radial position limitation. The processing process of parts is simple, the technology is mature, and it can be applied in a large range at low cost.

[0019] Use: The active vibration isolation platform of the present invention can control vibration isolation parameters in real time through an active control program. By means of induction control with a pressure sensor, it can detect extremely sensitive vibration parameters and effectively support and protect high-precision equipment in fields such as precision manufacturing, precision measurement, and aerospace. Different from the defects of existing active vibration isolation in the high-frequency vibration field, the present invention can adjust the damping of the multi-layer dot matrix distribution, dynamically adjust the system stiffness, and perform vibration isolation in multiple frequency bands. Through the gear meshing driving method, it can maintain stable operation in extreme working environments. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of a hierarchical active vibration isolation structure with a periodic dot matrix distribution according to a preferred embodiment of the present invention;

[0021] Figure 2 It is an internal view after hiding the housing according to a preferred embodiment of the present invention;

[0022] Figure 3 It is a half-sectional view according to a preferred embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of a dynamic damping driving mechanism according to a preferred embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of a dynamic damping and its moving parts according to a preferred embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of dynamic damping and fixed damping with a periodic dot matrix distribution according to a preferred embodiment of the present invention. Detailed Description of the Invention

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Based on a hierarchical active vibration isolation component with a periodic dot matrix distribution driven by a voice coil motor, it includes a bearing mechanism, an active control mechanism, a driving mechanism, and fixed dampers 7 and moving dampers 8 with a dot matrix distribution; the bearing mechanism includes an upper end cover 1, a fixed damper limiting cover 2, a lower end cover 4, and a base 5 arranged in sequence from top to bottom; the upper end cover 1, the fixed damper limiting cover 2, the lower end cover 4, and the base 5 are coaxially arranged; the active control mechanism includes a control panel 6, a voice coil motor 12, a pressure sensor 13, and a sensing circuit 14; the voice coil motor 12 and the pressure sensor 13 are connected to the control panel 6 through the sensing circuit 14; the driving mechanism includes a gear shaft 9, a primary driving plate 10, and a secondary driving plate 11; the gear shaft 9, the primary driving plate 10, and the secondary driving plate 11 are coaxially arranged; the primary driving plate 10 and the second driving plate 11 are grooved circumferentially.

[0030] It further includes a fixed damper limiting disc 18 and a sliding bearing chain 17. The fixed damper limiting disc 18 is arranged below the secondary driving plate 11 and is coaxially arranged with the gear shaft 9; the axial direction where the gear shaft 9 is located is the central axis; the gear shaft 9 is connected to the voice coil motor 12; the sliding bearing chain 17 is placed in the primary driving plate 10, the secondary driving disc 11, and the fixed damper limiting disc 18; the moving dampers 8 are all placed between the primary driving disc 10 and the secondary driving disc 11, and the fixed dampers 7 are respectively placed on both sides of the driving disc and are fixed by the fixed damper limiting cover 2 and the fixed damper limiting disc 18.

[0031] The fixed dampers and the moving dampers with a periodic dot matrix distribution are initially distributed at 45°.

[0032] The gear shaft 9 is connected to the voice coil motor 12 and is limited by a limiting block 16, and the circumferential torque is transmitted in a gear contact manner.

[0033] An elastic washer 15 is provided between the fixed damping limit cover 2 and the upper end cover 1 , and the elastic washer 15 cooperates with and fixes the middle two layers of fixed damping 7 .

[0034] The lower end cover 4 is coaxially matched with the fixed damping limit cover 2 and is fixed to the base 5 by bolts.

[0035] By the attached Figure 1 , 2 As shown in Figure 3, the main structure of the hierarchical active vibration isolation device with periodic lattice distribution is composed of six layers of vibration damping arranged at different angles, two of which are dynamic platforms and four are fixed platforms, which can be divided into a bearing mechanism, an active control mechanism, a driving mechanism and a lattice-distributed damping. The upper end cover 1 of the bearing mechanism ensures the limitation of axial movement and circumferential direction by means of circumferential limitation. The fixed damping limit cover 2 cooperates with the upper end cover 1 by means of an elastic gasket 15 and plays the role of fixing the two middle layers of fixed damping. The lower end cover 4 cooperates coaxially with the fixed damping limit cover 2 and is fixed to the base by bolts. The pressure sensor 13 of the active control mechanism is placed in the base 5, and the control panel 6, the voice coil motor 12 and the pressure sensor 14 are connected by a sensing line 14.

[0036] By the attached Figure 4 , 5 It can be seen that the driving mechanism of the present invention is composed of a gear shaft 9, a primary driving disk 10 and a secondary driving disk 11, and a two-layer dynamic platform is designed. The gear shaft 9 is connected to the voice coil motor 12 and is limited by a limit block 16, and the circumferential torque is transmitted by gear contact. The dynamic platform is composed of a dynamic damper 8, a primary driving disk 10, a secondary driving disk 11, a sliding bearing chain 17 and a fixed damping limit disk 18. The dynamic damper 8 is positioned by the driving disk, and the sliding bearing chain 17 is placed in the two slotted driving disks and the fixed damping limit disk 18, and is lubricated with lubricating oil.

[0037] By the attached Figure 6 It can be seen that the fixed damping and dynamic damping of the periodic lattice distribution are initially distributed at 45°, and the fixed damping is placed between the primary drive disk 10 and the secondary drive disk 11. The fixed damping is placed on both sides of the drive disk and is fixed by the fixed damping limit cover 2 and the fixed damping limit disk 18. The damping can use a vibration-damping spring or an elastic vibration-damping rubber, and the fixing method of the damping can be improved later according to different materials.

[0038] The core of the present invention is to provide an active vibration isolation platform based on a voice coil motor-driven periodic dot matrix distribution, which can actively adjust the damping and stiffness of the system periodically in real time. The installation process is as follows: The upper end cover 1 is used to carry the product to be vibration isolated, and the contact between the upper end cover 1 and the fixed damping limit cover 2 needs to be isolated by an elastic washer 15. While reserving a certain axial movement margin for the upper end cover 1, the circumferential positioning method is used to ensure that the upper end cover 1 does not rotate, thereby restricting the rotation of the fixed damping limit cover 2. The lower end cover 3 is connected to the base 5 by bolts 4 and can be fixed on the base platform. The gear shaft 9 is installed in the base 5, controlled by the voice coil motor 12, and limited by the limit block 16. Since the gear shaft 9 is hardly affected by axial loads, only radial and axial restrictions need to be considered. The two-layer moving platforms are respectively connected to the gear shaft through the first-level driving disk 10 and the second-level driving disk 11, and a certain number of dynamic dampers 8 are placed at a certain angle. There are two types of fixed damping limit disks 18. One is connected to the upper end cover and the base, and the other is connected to the driving disk, with sliding bearing chain grooves. A certain number of fixed dampers 7 are placed at a certain angle respectively. The bearing chain 17 connects the driving disk and the fixed damping limit disk 18 through lubricating oil, playing the role of radial limitation and circumferential lubrication. The pressure sensor 13 is placed in the base, and the sensing head is connected to the lower end of the fixed damping limit disk 18. The sensing line 14 connects the pressure sensor 13, the voice coil motor 12, and the control panel 6 in a circuit.

[0039] During the use process: First, install the equipment to be vibration isolated on the vibration isolator. The upper end cover 1 plays a connecting role with the equipment and can be connected through the threaded posts extended from the end cover. The whole device is placed on a horizontal tabletop, and the bolts extended from the base play a fixing role. When external vibration occurs, the amplitude is transmitted to the pressure sensor 13 through the upper end cover 1, the moving platform, and the fixed damping limit disk 18. The sensing device reads the real-time amplitude and frequency changes, and feeds this value back to the active control program module in the control panel 6 through the sensing line 14. After identification and calculation, a control signal is given and transmitted to the voice coil motor 12 to drive the voice coil motor 12 to rotate a certain angle, driving the gear shaft 9 to rotate a certain angle, so that the driving disk meshing with it rotates a certain angle with the assistance of the sliding bearing chain 17 and lubricating oil, and then drives the rotation of the dynamic damper 8. The damping distribution of each layer is four, and the dynamic damper and the fixed damper are distributed at a 45° angle. It can be seen that when the moving platform rotates, the angle between the dynamic damper and the fixed damper changes, and the change range is 45° to 0°. It can be found that when the moving platform rotates one week, the angle change between the fixed damper and the dynamic damper is 45° to 0° to 45° to 0°, showing an obvious periodic change. That is, this vibration isolation device can dynamically adjust the stiffness change periodically. When the external vibration source changes, the pressure sensor reads the changes in amplitude and frequency in real time, and adjusts the distribution form of the damping in real time through the algorithm, so as to isolate vibrations in different frequency vibration environments.

Claims

1. A hierarchical active vibration isolation component based on a voice coil motor-driven periodic dot matrix distribution, characterized in that It includes a bearing mechanism, an active control mechanism, a driving mechanism, and periodically arranged fixed dampers and moving dampers in a dot matrix; the bearing mechanism includes an upper end cover, a fixed damper limiting cover, a lower end cover, and a base arranged in sequence from top to bottom; the upper end cover, the fixed damper limiting cover, the lower end cover, and the base are coaxially arranged; the active control mechanism includes a control panel, a voice coil motor, a pressure sensor, and a sensing circuit; the voice coil motor and the pressure sensor are connected to the control panel through the sensing circuit; the driving mechanism includes a gear shaft, a first-stage driving plate, and a second-stage driving plate; the gear shaft, the first-stage driving plate, and the second-stage driving plate are coaxially arranged; the first-stage driving plate and the second driving plate are grooved circumferentially. It further includes a fixed damper limiting disc and a sliding bearing chain. The fixed damper limiting disc is arranged below the second-stage driving plate and is coaxially arranged with the gear shaft; the axial direction where the gear shaft is located is the central axis; the gear shaft is connected to the voice coil motor; the sliding bearing chain is placed in the first-stage driving plate, the second-stage driving disc, and the fixed damper limiting disc; the moving dampers are all placed between the first-stage driving disc and the second-stage driving disc, and the fixed dampers are respectively placed on both sides of the driving disc and are fixed by the fixed damper limiting cover and the fixed damper limiting disc.

2. The hierarchical active vibration isolation component based on the voice coil motor-driven periodic dot matrix distribution according to claim 1, characterized in that , The periodically arranged fixed dampers and moving dampers in a dot matrix are initially distributed at an angle of 45°.

3. The hierarchical active vibration isolation component based on the voice coil motor-driven periodic dot matrix distribution according to claim 2, characterized in that , The gear shaft is connected to the voice coil motor and is limited by a limiting block, and the circumferential torque is transmitted in a gear contact manner.

4. The hierarchical active vibration isolation component based on the voice coil motor-driven periodic dot matrix distribution according to claim 3, wherein , An elastic washer is arranged between the fixed damper limiting cover and the upper end cover, and the middle two layers of fixed dampers are cooperated and fixed through the elastic washer.

5. The hierarchical active vibration isolation component based on the voice coil motor-driven periodic dot matrix distribution according to claim 4, characterized in that , The lower end cover is coaxially fitted with the fixed damper limiting cover and is fixed to the base by bolts.

6. The hierarchical active vibration isolation component based on the voice coil motor-driven periodic dot matrix distribution according to claim 5, wherein , First, install the equipment to be vibration-isolated on the vibration isolation assembly. The upper end cover is connected to the equipment through the threaded posts extending from the end cover. The whole device is placed on a horizontal tabletop, and the bolts extending from the base play a fixing role; the moving dampers, the first-stage driving disc, the second-stage driving disc, the sliding bearing chain, and the fixed damper limiting disc form a moving platform; when external vibration occurs, the amplitude is transmitted to the pressure sensor through the upper end cover, the moving platform, and the fixed damper limiting disc. The sensing device reads the real-time amplitude and frequency changes and feeds this value back to the active control program module in the control panel through the sensing circuit. After identification and calculation, a control signal is given and transmitted to the voice coil motor to drive the voice coil motor to rotate, driving the gear shaft to rotate a certain angle, so that the driving disc meshing with it rotates a certain angle under the assistance of the sliding bearing chain and lubricating oil, and then drives the rotation of the moving dampers; there are four damping distributions in each layer, and the moving dampers and the fixed dampers are distributed at an angle of 45°. When the moving platform rotates, the angle between the moving dampers and the fixed dampers changes, and the change range is 45°~0°. It is found that when the moving platform rotates one week, the angle change between the fixed dampers and the moving dampers is 45°~0°~45°~0°, showing an obvious periodic change. That is, this vibration isolation device can periodically and dynamically adjust the stiffness change. When the external vibration source changes, the pressure sensor reads the changes in amplitude and frequency in real time, and adjusts the distribution form of the dampers in real time through an algorithm, so as to isolate vibrations in different frequency vibration environments.

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