A friction energy recovery power vibration absorber

Abstract

The present invention discloses a dynamic vibration absorber with friction energy recovery, including a vibration absorber body, a vibration absorber base is arranged at the bottom end of the vibration absorber body, a vibration absorber side plate is arranged at the top end of the vibration absorber base, the vibration absorber base and the vibration absorber side plate are fixedly connected by bolts, a vibration absorber cover is arranged at the top end of the vibration absorber side plate, and a gasket is arranged between the vibration absorber cover and the vibration absorber side plate. The present invention organically combines the vibration absorption principle with energy recovery, and the two cooperate with each other to effectively control vibration while greatly improving the proportion and efficiency of vibration energy recovery. The structure is simple and the reliability is high; the detachable spring allows the stiffness of the vibration absorber to be adjusted to adapt to different working frequencies; the vibration absorber has friction damping, and the magnitude of the friction damping force is adjustable; the sliding friction method is adopted, which is different from other contact collision power generation methods or piezoelectric power generation methods, and this method will not cause secondary vibration.

Description

Technical Field

[0001] The invention relates to the field of vibration engineering, and in particular to a friction-type energy recovery power vibration absorber. Background Art

[0002] Mechanical vibration can cause many adverse effects in engineering, such as noise pollution, affecting the operation of other mechanical equipment, and reducing the accuracy of instruments and machines. In engineering, a variety of means are used to reduce the harm of vibration, including vibration absorption, vibration isolation, vibration damping, vibration elimination and structural modification. Dynamic vibration absorber refers to a device that uses the resonance system to absorb the vibration of an object to reduce the vibration of the object. The principle is to attach a mass-spring resonance system to the vibrating object. The reaction force generated by this additional system during resonance can reduce the vibration of the vibrating object. The traditional vibration absorber composed of a mass-spring system has a good vibration absorption effect on the specific constant frequency of the controlled system because the mass and stiffness are not adjustable. In order to better control the amplitude of vibration, the current vibration absorber structure often designs a certain damping on the basis of the traditional undamped vibration absorber. The purpose is to suppress the new resonance peak generated by the installation of the vibration absorber. The type of damping can be viscous damping or friction damping. Traditional damping is to convert the mechanical energy of vibration into internal energy for dissipation.

[0003] A Chinese patent for an eddy current tuned mass damper based on vibration energy recovery [invention patent: CN107327038A], this device converts mechanical energy into electrical energy by absorbing external vibrations and cutting the magnetic flux lines of permanent magnets. In order to effectively generate eddy currents during operation, this device needs to ensure a certain amplitude for cutting the magnetic flux lines, and the size of the damping parameters generated is directly related to the size of the eddy currents, so there are certain requirements for the application scenarios. The present invention generates damping by friction, and generates electricity while rubbing. The damping size is determined by the friction coefficient and the positive pressure, and has nothing to do with the frequency and amplitude of the vibration of the controlled object. In addition, the energy recovery device named piezoelectric cantilever beam absorber [invention patent: 201220313428.8] combines a cantilever beam structure with a piezoelectric material. The piezoelectric material is attached to the cantilever beam structure and generates electrical energy through the positive piezoelectric effect. The patent does not give the specific device structure design and materials, but from the principle, it can be known that the electric energy generated is positively correlated with the mechanical stress of the material, and its power generation efficiency is directly related to the pressure or deformation of the material; in addition, the damping of the device is the structural damping of the cantilever beam and the piezoelectric material. If other damping links are not designed, its damping parameters are often very small, and the same as the traditional undamped vibration absorber, two larger resonance peaks will be generated on both sides of the vibration absorption frequency; but no friction damping link is added to the vibration absorber, the damping size cannot be adjusted, and vibration energy recovery cannot be performed. In addition, in Chinese patents, such as the invention patent disclosed by the Beijing Institute of Nano Energy and Systems: Vibration-type nanogenerator [CN201610096418.6], the patent is based on the structural design of collision contact, which will cause the hazard of secondary vibration. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a friction energy recovery power vibration absorber to solve the problem.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: the present invention includes a vibration absorber body, a vibration absorber base is arranged at the bottom end of the vibration absorber body, a vibration absorber side plate is arranged at the top end of the vibration absorber base, the vibration absorber base and the vibration absorber side plate are fixedly connected by bolts, a vibration absorber cover is arranged at the top end of the vibration absorber side plate, a gasket is arranged between the vibration absorber cover and the vibration absorber side plate, the vibration absorber cover, the vibration absorber side plate and the gasket are all fixedly connected by bolts, insulating blocks are arranged at the upper and lower ends of the vibration absorber body, threaded straight holes for fixing the two ends of the linear bearing are arranged on the vibration absorber base and the vibration absorber cover, the linear bearing is fixed in the threaded straight holes, the linear bearing passes through the insulating block, a replaceable spring is sleeved on the outer side of the linear bearing, a metal electrode is arranged on the inner side of the vibration absorber side plate, a certain gap is left between the upper and lower metal electrodes, PTFE material layers are arranged on both sides of the insulating block, the metal electrodes are in close contact with the PTFE material layers, and one end of the two metal electrodes is electrically connected to the current collecting device through a wire respectively.

[0006] Preferably, a carrying handle is provided on the outside of the current collecting device, and the carrying handle is connected to the current collecting device by a hinge. The current collecting device can be equipped with electronic components and circuit systems such as a rectifier circuit, a load, an energy storage capacitor, a battery and its charging circuit according to specific needs.

[0007] Preferably, the outer side of the carrying handle is sleeved with an antistatic fiber sleeve.

[0008] Preferably, a plurality of mounting holes are provided on the vibration absorber base.

[0009] Preferably, the insulating block and the PTFE material layer are bonded by a strong adhesive colloid.

[0010] Preferably, the metal electrode can be mounted on the side plate of the vibration absorber by bolt connection or colloid.

[0011] Preferably, the material of the metal electrode may be pure aluminum, or may be pure aluminum with copper plating on the mounting surface side of the non-friction surface.

[0012] The beneficial effects of the present invention include:

[0013] 1) The vibration absorption principle is organically combined with energy recovery. The two cooperate with each other to effectively control vibration while greatly improving the proportion and efficiency of vibration energy recovery. It has a simple structure and high reliability.

[0014] 2) The removable spring allows the stiffness of the vibration absorber to be adjusted to suit different operating frequencies;

[0015] 3) The vibration absorber has friction damping, and the magnitude of the friction damping force can be adjusted;

[0016] 4) The sliding friction method is adopted, which is different from other contact collision power generation methods or piezoelectric power generation methods. This method will not cause secondary vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the installation hole of the present invention.

[0020] Figure 3 It is a schematic diagram of the installation structure of the carrying handle of the present invention.

[0021] Figure 4 It is a partial cross-sectional view of the present invention.

[0022] Figure 5 The present invention Figure 4 Schematic diagram of the structure of A. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-5 The specific implementation modes of the present invention are described in further detail.

[0024] Example, by Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The present invention includes a vibration absorber body, a vibration absorber base 1 is arranged at the bottom end of the vibration absorber body, a vibration absorber side plate 3 is arranged at the top end of the vibration absorber base 1, the vibration absorber base 1 and the vibration absorber side plate 3 are fixedly connected by bolts 2, a vibration absorber cover 5 is arranged at the top end of the vibration absorber side plate 3, a gasket 4 is arranged between the vibration absorber cover 5 and the vibration absorber side plate 3, the vibration absorber cover 5, the vibration absorber side plate 3 and the gasket 4 are all fixedly connected by bolts 2, and insulating blocks 10 are arranged at the upper and lower ends of the vibration absorber body, and the vibration absorber base 1 and the vibration absorber are fixedly connected. There are threaded straight holes on the cover 5 for fixing the two ends of the linear bearing 9. The linear bearing 9 is fixed in the threaded straight holes. The linear bearing 9 passes through the insulating block 10. A replaceable spring 6 is sleeved on the outer side of the linear bearing 9. A metal electrode 8 is arranged on the inner side of the vibration absorber side plate 3. A certain gap is left between the upper and lower metal electrodes 8. PTFE material layers 7 are arranged on both sides of the insulating block 10. The metal electrodes 8 are in close contact with the PTFE material layers 7. One end of the two metal electrodes 8 is electrically connected to the current collecting device 12 through a wire 11 respectively.

[0025] A carrying handle 15 is provided on the outside of the current collecting device 12, and the carrying handle 15 is connected to the current collecting device 12 by a hinge. The current collecting device 12 can be equipped with electronic components and circuit systems such as rectifier circuits, loads, energy storage capacitors, batteries and their charging circuits according to specific needs.

[0026] The outer side of the carrying handle 15 is sleeved with an antistatic fiber sleeve 16 .

[0027] A plurality of mounting holes 17 are provided on the vibration absorber base 1 .

[0028] The insulating block 10 and the PTFE material layer 7 are bonded together by a strong adhesive colloid.

[0029] The metal electrode 8 can be connected by bolts 2 or mounted on the vibration absorber side plate 3 by colloid.

[0030] The material of the metal electrode 8 can be pure aluminum, or pure aluminum with copper plating on the non-friction mounting surface.

[0031] The insulating block 10 of the present invention is maintained at a certain height due to the spring forces at both ends. When it is vibrated, it will produce vertical up and down movements within a certain range. When it moves upward to the limit, it will not collide with the vibration absorber cover 5, and when it moves downward to the limit, it will not collide with the vibration absorber base 1. The main principle of the device to suppress vibration is dynamic vibration absorption, that is, a subsystem is attached to the controlled object so that the vibration of a certain frequency can be controlled, and the force generated by the vibration absorber in the main system is used to balance the forced force of the controlled system, thereby reducing the response of the controlled system to the excitation of the vibration source. The present device is an additional subsystem, in which the insulating block 10 and the spring 6 are the mass element and the spring in the subsystem. Component, in addition, the PTFE material layer 7 and the metal electrode 8 dry rub to generate friction damping. Therefore, in addition to the dynamic effect, the dynamic vibration absorber also consumes energy by damping, has a good vibration reduction effect, a widened vibration reduction frequency band, and has a wider range of applications. When the dynamic vibration absorber is working, the natural frequency of the dynamic vibration absorber is adjusted to be the same as the natural frequency of the controlled system, thereby transferring the vibration of the controlled system to the vibration absorber. At this time, the vibration absorber is in a resonant state, and the original vibration of the vibration system at this frequency will be weakened or even disappear, but near this frequency, two new resonance peaks will be added, and the peak value of the resonance peak is related to the damping parameter of the vibration absorber. The PTFE material layer 7 can be adhered to both sides of the insulating block 10 through a strong adhesive colloid and move with it. The metal electrode 8 can be installed on the vibration absorber side plate 3 through bolt connection or colloid. It should be noted that a certain gap must be left between the two metal electrodes 8 to prevent current short circuit. The material of the metal electrode 8 can be pure aluminum, or pure aluminum can be used and copper-plated on the side of the installation surface of the non-friction surface to improve the conductivity of the overall electrode. The vibration absorber side plate 3, the vibration absorber base 1, and the vibration absorber cover 5 are all provided with threaded holes, and the three are connected by bolts 2 and gaskets 4. After normal connection, due to the original intention of size design, the metal electrode 8 and the PTFE material layer 7 in the device should be in a state of contact without generating mutual force. By changing the pre-tightening force of the bolt 2, the tightness of the connection is changed, so that the distance between the metal electrode 8 and the PTFE material layer 7 can be changed. It should be noted that the preload should not be too large, otherwise the contact will be too close and the friction will be too large, resulting in the relative position of the two not changing or being difficult to change, thus affecting the resonance of the vibration absorber. The preload should not be too small, otherwise the contact between the two will be loose, affecting the formation of the potential difference, thus affecting the energy conversion efficiency. The dry friction generated in this part plays a damping role, increasing the damping link, and can more effectively suppress vibration. Compared with the undamped vibration absorber, which is only effective in a narrow range of excitation frequencies near the natural frequency, it has the advantage of being less restricted by the frequency band and better suppressing the resonance of the system. Therefore, the damped vibration absorber can adapt to more working objects. The peak value of the resonance peak is related to the damping parameter of the vibration absorber. Therefore, the damping force can be adjusted by adjusting the preload. Adjusting to a suitable damping value can minimize the resonance peak of the main vibration system.The linear bearing 9 part can change the natural frequency of the mass-spring resonance system by replacing springs 6 with different stiffnesses to adapt to working objects with different vibration frequencies. They together constitute a dynamic vibration absorber. The metal electrode 8, PTFE material layer 7, wire 11, current collection device 12, etc. constitute the energy conversion part. When absorbing vibration, the insulating block 10 and the PTFE material layer 7 move vertically up and down along the linear bearing 9. The PTFE material layer 7 and the metal electrode 8 produce friction and the contact area changes. When the insulating block 10 moves to the upper limit, the PTFE material layer 7 is completely in contact with the upper metal electrode 8. Due to contact electrification, the surfaces of the PTFE material layer 7 and the upper metal electrode 8 will carry equal amounts of opposite charges. When the insulating block 10 moves downward When the current collector 12 is connected to the upper metal electrode 8, the electrons in the circuit will flow from the upper metal electrode 8 to the lower metal electrode 8 through the wire and the current collector, thereby generating a positive current until the PTFE material layer 7 is in full contact with the lower metal electrode 8. The electrons in the circuit will flow back to the upper metal electrode 8. At this time, the output current is zero. The triboelectric material, including the PTFE material layer, can be processed on the surface using micro-nano processing technology to form a unique micro-nano structure, increase the specific surface area, and increase the surface charge by increasing the contact surface. The two metal plates are connected to the current collector 12 through the wire 11. The current collector 12 can be designed with electronic components and circuit systems such as rectifier circuits, loads, energy storage capacitors, batteries and their charging circuits according to specific needs.

[0032] Compared with the existing technology, the present invention: 1) organically combines the vibration absorption principle with energy recovery, and the two cooperate with each other to effectively control vibration while greatly improving the proportion and efficiency of vibration energy recovery, with simple structure and high reliability; 2) the detachable spring 6 allows the stiffness of the vibration absorber to be adjusted to adapt to different operating frequencies; 3) the vibration absorber has friction damping, and the magnitude of the friction damping force can be adjusted; 4) the sliding friction method is adopted, which is different from other contact collision power generation methods or piezoelectric power generation methods, and this method will not cause secondary vibration.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A friction energy recovery dynamic vibration absorber, comprising a vibration absorber body, characterized in that: The bottom end of the vibration absorber body is provided with a vibration absorber base (1), the top end of the vibration absorber base (1) is provided with a vibration absorber side plate (3), the vibration absorber base (1) and the vibration absorber side plate (3) are fixedly connected by bolts (2), the top end of the vibration absorber side plate (3) is provided with a vibration absorber cover (5), a gasket (4) is provided between the vibration absorber cover (5) and the vibration absorber side plate (3), the vibration absorber cover (5), the vibration absorber side plate (3) and the gasket (4) are all fixedly connected by bolts (2), the upper and lower ends of the vibration absorber body are provided with insulating blocks (10), the upper and lower ends of the vibration absorber base (1) and the vibration absorber cover (5) are fixedly connected to each other, and the upper and lower ends of the vibration absorber body are fixedly connected to each other. There are threaded straight holes for fixing both ends of the linear bearing (9), the linear bearing (9) is fixed in the threaded straight holes, the linear bearing (9) penetrates the insulating block (10), a replaceable spring (6) is sleeved on the outer side of the linear bearing (9), a metal electrode (8) is arranged on the inner side of the vibration absorber side plate (3), a certain gap is left between the upper and lower metal electrodes (8), PTFE material layers (7) are arranged on both sides of the insulating block (10), the metal electrode (8) is in close contact with the PTFE material layer (7), and one end of the two metal electrodes (8) is electrically connected to the current collecting device (12) through a wire (11) respectively; The metal electrode (8) can be connected by bolts (2) or mounted on the vibration absorber side plate (3) by colloid; A carrying handle (15) is provided on the outer side of the current collecting device (12); the carrying handle (15) is connected to the current collecting device (12) via a hinge; the current collecting device (12) is provided with a rectifier circuit, a load, an energy storage capacitor, a battery and a charging circuit thereof.

2. A friction energy recovery dynamic vibration absorber according to claim 1, characterized in that: The outer side of the carrying handle (15) is sleeved with an antistatic fiber sleeve (16).

3. The friction energy recovery dynamic vibration absorber according to claim 1, characterized in that: A plurality of mounting holes (17) are provided on the vibration absorber base (1).

4. The friction energy recovery dynamic vibration absorber according to claim 1, characterized in that: The insulating block (10) and the PTFE material layer (7) are bonded together by a strong adhesive colloid.

5. The friction energy recovery dynamic vibration absorber according to claim 1, characterized in that: The material of the metal electrode (8) is pure aluminum, or pure aluminum with copper plating on the non-friction mounting surface.

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