Frequency-adjustable piezoelectric vibration exciter

Abstract

The invention provides a frequency-adjustable piezoelectric vibration exciter which comprises an upper cover, a cylinder body and a base which are sequentially arranged, a through hole is formed in the upper cover, an axially-through vibration excitation space is formed in the cylinder body, a vibration excitation rod, a damping adjusting mechanism, a piezoelectric disc and a support are sequentially arranged in the vibration excitation space, the support is arranged on the base, and the damping adjusting mechanism is arranged on the base. The vibration excitation rod penetrates through the through hole from the vibration excitation space and extends out of the upper cover, the damping adjusting mechanism comprises a first damping fin and a first transmission column, the first damping fin is arranged between the vibration excitation rod and the transmission column, and the first damping fin is used for adjusting the vibration frequency transmitted to the vibration excitation rod by the piezoelectric disc; a pre-tightening piece for pre-tightening the first transmission column is arranged on the upper cover; the vibration frequency transmitted by the piezoelectric disc to the vibration excitation rod is adjusted, the range of the vibration frequency capable of being output by the piezoelectric vibration exciter is expanded, large-scale vibration is achieved at high and low frequencies, the structure is simple, and disassembly and assembly are convenient.

Description

Technical Field

[0001] The invention relates to the technical field of vibration excitation devices, and in particular to a frequency-adjustable piezoelectric exciter. Background Art

[0002] A piezoelectric exciter is a device that converts electrical energy into mechanical vibration. It uses the piezoelectric effect to convert electrical energy into mechanical vibration energy. It has the advantages of fast response speed, good stability, and low energy consumption. It is widely used in medicine, precision machining, instrumentation and other fields.

[0003] The physical properties of piezoelectric materials and the design of the drive circuit limit the high-frequency response capability of piezoelectric exciters, and their operating frequency range is relatively small. Under high-frequency vibration, piezoelectric materials may not be able to effectively convert electrical energy into mechanical energy, or may be damaged due to excessive stress. Therefore, piezoelectric exciters are usually suitable for lower-frequency vibration applications and are not easy to adjust freely, which to some extent limits their use in certain application scenarios that require a wide frequency range. Summary of the invention

[0004] The object of the present invention is to provide a frequency-adjustable piezoelectric exciter to solve the above-mentioned problem.

[0005] The technical solution adopted by the present invention is:

[0006] A frequency-adjustable piezoelectric exciter comprises an upper cover, a cylinder body and a base which are arranged in sequence, wherein a through hole is arranged on the upper cover, an axially penetrating excitation space is arranged in the cylinder body, an excitation rod, a damping adjustment mechanism, a piezoelectric disk and a support are arranged in sequence in the excitation space, the support is arranged on the base, the excitation rod passes through the through hole in the excitation space and extends out of the upper cover, the damping adjustment mechanism comprises a first damping plate and a first transfer column, the first damping plate is arranged between the excitation rod and the transfer column, the first damping plate is used to adjust the vibration frequency transmitted to the excitation rod by the piezoelectric disk, and a pre-tightening member for pre-tightening the first transfer column is arranged on the upper cover.

[0007] As a further improved technical solution of the present invention, a second transmission column is arranged between the first transmission column and the piezoelectric disk, and a second damping plate is arranged between the first transmission column and the second transmission column, and the second damping plate is used to adjust the vibration frequency transmitted to the first transmission column by the piezoelectric disk.

[0008] As a further improved technical solution of the present invention, the thickness of the first damping plate / the second damping plate is 0.1-0.3 mm.

[0009] As a further improved technical solution of the present invention, the preload member is a spring, the first transfer column includes a first column and a second column connected together, the diameter of the first column is smaller than the diameter of the second column, the spring is sleeved outside the excitation rod and the first column, one end of the spring abuts the bottom surface of the upper cover, and the other end of the spring abuts the upper surface of the second column.

[0010] As a further improved technical solution of the present invention, the spring is a rectangular spring.

[0011] As a further improved technical solution of the present invention, the diameter of the second transfer column is consistent with the diameter of the second column.

[0012] As a further improved technical solution of the present invention, a guide copper ring is provided on the upper cover, and the guide copper ring is used to guide the reciprocating motion of the exciting rod.

[0013] As a further improved technical solution of the present invention, an annular groove is arranged in the upper cover with the through hole as the center, the guide copper ring is arranged in the annular groove, and the inner side wall of the guide copper ring abuts against the outer cylindrical surface of the exciting rod.

[0014] As a further improved technical solution of the present invention, a groove is arranged on the upper cover, the groove is centered on the annular groove and connected to the annular groove, and a pressure plate is arranged in the groove, and the pressure plate presses the guide copper ring.

[0015] As a further improved technical solution of the present invention, at least two piezoelectric disks are superimposed and arranged between the damping adjustment mechanism and the base.

[0016] The beneficial effects of the present invention are:

[0017] Through the above structure, a damping adjustment mechanism is set to adjust the vibration frequency transmitted to the exciting rod by the piezoelectric disk, thereby expanding the vibration frequency range that the piezoelectric exciter can output, achieving a larger magnitude of vibration at both high and low frequencies, with a simple structure and convenient disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the piezoelectric exciter;

[0019] Figure 2 is a cross-sectional view of a piezoelectric exciter;

[0020] Figure 3 It is a schematic diagram of the structure of the excitation component;

[0021] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0022] Among them: 1-upper cover, 2-cylinder body, 3-base, 4-excitation rod, 501-first damping plate, 502-first transfer column, 5021-first column, 5022-second column, 503-second transfer column, 504-second damping plate, 505-spring, 6-piezoelectric disk, 7-support, 8-guide copper ring, 9-pressure plate, 10-outlet. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0024] If the invention involves directions (e.g., up, down, left, right, front, back, outside, inside, etc.) when describing, it is necessary to define the directions involved, such as "In order to clearly express the positions and directions described in the invention, the end close to the operator is the proximal end, and the end away from the operator is the distal end." Or define it with the paper as a reference. Of course, if the positional relationship between the two is defined by mutual reference in the subsequent description, it does not need to be defined here.

[0025] A frequency-adjustable piezoelectric exciter, such as Figures 1-2 As shown, it includes an upper cover 1, a cylinder body 2 and a base 3 arranged in sequence, a through hole is arranged on the upper cover 1, an axially penetrating excitation space is arranged in the cylinder body 2, and the extension direction of the excitation space is consistent with the arrangement direction of the upper cover 1, the cylinder body 2 and the base 3, and the upper cover 1, the cylinder body 2 and the base 3 are arranged coaxially. An excitation component is arranged in the excitation space, and the output end of the excitation component extends out of the upper cover 1 through the through hole, and the excitation component is used to output the excitation force.

[0026] like Figure 2 and Figure 4 As shown, the excitation assembly includes an excitation rod 4, a damping adjustment mechanism, a piezoelectric disk 6 and a support 7 arranged in sequence, the support 7 is arranged on the base 3, the excitation rod 4 extends out of the upper cover 1 from the excitation space, and the damping adjustment mechanism can adjust the excitation force output by the piezoelectric disk 6. The damping adjustment mechanism includes a first damping plate 501 and a first transfer column 502 arranged in sequence, the first damping plate 501 is arranged between the excitation rod 4 and the first transfer column 502, the first damping plate 501 is used to adjust the vibration frequency transmitted from the piezoelectric disk 6 to the excitation rod 4, and a pre-tightening member for pre-tightening the first transfer column 502 is arranged on the upper cover 1.

[0027] As an embodiment of the present invention, the preload member is a spring 505, the first transmission column 502 includes a first column 5021 and a second column 5022 connected together, the diameter of the first column 5021 is smaller than the diameter of the second column 5022, the spring 505 is sleeved outside the excitation rod 4 and the first column 5021, one end of the spring 505 abuts against the bottom surface of the upper cover 1, and the other end of the spring 505 abuts against the upper surface of the second column 5022. Preferably, the diameter of the excitation rod 4 is consistent with the diameter of the first column 5021. During operation, AC high voltage electricity is passed to the piezoelectric disk 6, and the piezoelectric disk 6 contracts up and down to transmit the vibration force to the first transfer column 502, and the first transfer column 502 transmits the force to the excitation rod 4. In this process, the elastic force of the spring 505 is used to pre-tighten the first transfer column 502 and the piezoelectric disk 6. According to different test requirements, different numbers and / or thicknesses of first damping plates 501 are designed to change the vibration frequency response transmitted to the excitation rod 4.

[0028] A second transmission column 503 is provided between the first transmission column 502 and the piezoelectric disk 6, and a second damping sheet 504 is provided between the first transmission column 502 and the second transmission column 503. The second damping sheet 504 is used to adjust the vibration frequency transmitted by the piezoelectric disk 6 to the first transmission column 502. By using the elastic force of the spring 505 to pre-tighten the first transmission column 502 and the second transmission column 503, different numbers and / or thicknesses of second damping sheets 504 are designed according to different test requirements to change the vibration frequency response transmitted to the first transmission column 502.

[0029] As an embodiment of the present invention, the first damping sheet 501 has the same structure as the second damping sheet 504, and the first damping sheet 501 / the second damping sheet 504 are made of butyl rubber, and the thickness of the first damping sheet 501 / the second damping sheet 504 is 0.1-0.3 mm. The damping sheet made of butyl rubber is tough and durable, can withstand high-intensity vibration and impact, can maintain stable performance during long-term use, is not easy to damage, is easy to repair and replace, and reduces downtime and maintenance costs.

[0030] As an embodiment of the present invention, the spring 505 is a rectangular spring. A rectangular spring has a smaller volume. Under the same space conditions, a spring with a rectangular cross section has a greater stiffness and absorbs more energy. It can withstand a larger load, impact, and high-speed amplitude, and is suitable for occasions where space is limited or high-frequency vibration is required. It also has good stability and fatigue resistance, and can maintain stable performance during long-term use.

[0031] Generally, the larger the diameter, the greater the rigidity of the damping sheet and the greater the resonant frequency. Conversely, the smaller the diameter, the smaller the rigidity of the damping sheet and the smaller the resonant frequency. Therefore, different resonant frequencies can be achieved by using different rigidities of the damping sheet. In application, the diameter of the first damping sheet 501 is consistent with the diameter of the second transmission column 503, the diameter of the second damping sheet 504 can be consistent with the diameter of the excitation rod 4 and the first column 5021, the diameter of the second transmission column 503 can be consistent with the diameter of the second column 5022 of the first transmission column 502, and the diameter of the first damping sheet 501 is smaller than the diameter of the second damping sheet 504. The first damping sheet 501 with a smaller diameter can achieve a low-frequency response, and the second damping sheet 504 with a larger diameter can achieve a high-frequency response, thereby expanding the vibration frequency range that the piezoelectric exciter can output, achieving a larger magnitude of vibration at both high and low frequencies, and meeting the magnitude requirements of the vibration test.

[0032] As an embodiment of the present invention, at least two piezoelectric disks 6 are superimposed and arranged between the damping adjustment mechanism and the base 3. The piezoelectric disks 6 are made of piezoelectric material.

[0033] As an embodiment of the present invention, each component of the excitation assembly is bonded by epoxy resin. Epoxy resin has extremely high bonding strength and can firmly bond different materials together, greatly enhancing the strength of the overall structure.

[0034] As an embodiment of the present invention, Figure 3 As shown, a through hole is provided on the upper cover 1, and the through hole is used for the excitation rod 4 to reciprocate. An annular groove is formed in the upper cover 1 with the through hole as the center, and the annular groove is connected with the through hole. A guide copper ring 8 is provided in the annular groove, and the inner side wall of the guide copper ring 8 abuts against the outer cylindrical surface of the excitation rod 4 and guides the reciprocating motion of the excitation rod 4. The guide copper ring 8 can withstand greater pressure and load, and is not easy to deform or damage. At the same time, due to its good thermal conductivity, electrical conductivity and wear resistance, it can effectively conduct heat, prevent local overheating, maintain the integrity of shape and function for a long time, and reduce the frequency of maintenance and replacement.

[0035] As an embodiment of the present invention, in order to facilitate the installation of the guide copper ring 8, a groove is arranged on the upper cover 1, the groove is centered on the annular groove and connected to the annular groove, a pressure plate 9 is arranged in the groove, the pressure plate 9 presses the guide copper ring 8, and fasteners are arranged between the pressure plate 9 and the upper cover 1 for connection, thereby improving the convenience of disassembly of the guide copper ring 8.

[0036] A wire outlet 10 is provided at the lower portion of the cylinder body 2 , and the wire outlet 10 is used for routing wires and for dissipating heat to a certain extent.

[0037] The frequency-adjustable piezoelectric exciter provided by the present invention is provided with a damping adjustment mechanism and a transmission column to adjust the vibration frequency transmitted from the piezoelectric disk 6 to the exciting rod 4, thereby expanding the vibration frequency range that the piezoelectric exciter can output, and can achieve a larger magnitude of vibration at both high and low frequencies. It has a simple structure and is easy to disassemble and assemble.

[0038] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0039] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A frequency-adjustable piezoelectric exciter, characterized in that: The invention comprises an upper cover (1), a cylinder body (2) and a base (3) which are arranged in sequence, wherein a through hole is arranged on the upper cover (1), an axially penetrating excitation space is arranged in the cylinder body (2), an excitation rod (4), a damping adjustment mechanism, a piezoelectric disk (6) and a support (7) are arranged in sequence in the excitation space, the support (7) is arranged on the base (3), the excitation rod (4) passes through the through hole in the excitation space and extends out of the upper cover (1), the damping adjustment mechanism comprises a first damping plate (501) and a first transmission column (502), the first damping plate (501) is arranged between the excitation rod (4) and the transmission column, the first damping plate (501) is used to adjust the vibration frequency transmitted from the piezoelectric disk (6) to the excitation rod (4), and a pre-tightening member for pre-tightening the first transmission column (502) is arranged on the upper cover (1).

2. The frequency-adjustable piezoelectric exciter according to claim 1, characterized in that: A second transmission column (503) is arranged between the first transmission column (502) and the piezoelectric disk (6), and a second damping plate (504) is arranged between the first transmission column (502) and the second transmission column (503), and the second damping plate (504) is used to adjust the vibration frequency transmitted from the piezoelectric disk (6) to the first transmission column (502).

3. The frequency-adjustable piezoelectric exciter according to claim 2, characterized in that: The thickness of the first damping plate (501) / the second damping plate (504) is 0.1-0.3 mm.

4. The frequency-adjustable piezoelectric exciter according to claim 2, characterized in that: The preload member is a spring (505), and the first transfer column (502) includes a first column (5021) and a second column (5022) connected together, the diameter of the first column (5021) is smaller than the diameter of the second column (5022), and the spring (505) is sleeved outside the excitation rod (4) and the first column (5021), one end of the spring (505) abuts against the bottom surface of the upper cover (1), and the other end of the spring (505) abuts against the upper surface of the second column (5022).

5. The frequency-adjustable piezoelectric exciter according to claim 4, characterized in that: The spring (505) is a rectangular spring (505).

6. The frequency-adjustable piezoelectric exciter according to claim 4, characterized in that: The diameter of the second transfer column (503) is consistent with the diameter of the second column (5022).

7. The frequency-adjustable piezoelectric exciter according to claim 1, characterized in that: A guide copper ring (8) is provided on the upper cover (1), and the guide copper ring (8) is used to guide the reciprocating motion of the exciting rod (4).

8. The frequency-adjustable piezoelectric exciter according to claim 7, characterized in that: An annular groove is arranged in the upper cover (1) with the through hole as the center, the guide copper ring (8) is arranged in the annular groove, and the inner side wall of the guide copper ring (8) abuts against the outer circumferential surface of the exciting rod (4).

9. The frequency-adjustable piezoelectric exciter according to claim 8, characterized in that: A groove is arranged on the upper cover (1), the groove is centered on the annular groove and is connected to the annular groove, and a pressing plate (9) is arranged in the groove, and the pressing plate (9) presses the guide copper ring (8).

10. The frequency-adjustable piezoelectric exciter according to claim 1, characterized in that: At least two piezoelectric discs (6) are superimposed and arranged between the damping adjustment mechanism and the base (3).

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