Frequency-adjustable piezoelectric vibration exciter

Abstract

The frequency-adjustable piezoelectric vibration exciter 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 utility model relates to the technical field of vibration excitation device, concretely relates to an adjustable frequency piezoelectric vibration exciter. BACKGROUND

[0002] The piezoelectric vibration exciter is a device that converts electrical energy into mechanical vibration, which utilizes the piezoelectric effect to convert electrical energy into mechanical vibration energy, has the advantages of fast response speed, good stability, low energy consumption, etc., and has a wide range of applications in the fields of medicine, precision machining, instruments and meters, etc.

[0003] Affected by the physical properties of piezoelectric materials and the design of driving circuits, etc., the high-frequency response capability of the piezoelectric vibration exciter is limited, and its working frequency range is relatively small. Under high-frequency vibration, the piezoelectric material may not be able to effectively convert electrical energy into mechanical energy, or it may be damaged due to excessive stress. Therefore, the piezoelectric vibration exciter is usually suitable for lower frequency vibration applications and is not convenient to adjust freely, which to some extent limits its use in some application scenarios that require a wide frequency range. SUMMARY

[0004] The utility model discloses a kind of adjustable frequency piezoelectric vibration exciters, to solve the above problems.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] An adjustable frequency piezoelectric vibration exciter includes an upper cover, a cylinder body and a base arranged in sequence, a through hole is provided on the upper cover, an axial through excitation space is provided in the cylinder body, an excitation rod, a damping adjustment mechanism, a piezoelectric disc and a support are arranged in sequence in the excitation space, the support is arranged on the base, the excitation rod extends out of the upper cover through the through hole from the excitation space, the damping adjustment mechanism includes a first damping sheet and a first transmission column, the first damping sheet is arranged between the excitation rod and the transmission column, and the first damping sheet is used to adjust the vibration frequency of the piezoelectric disc transmitted to the excitation rod. A pre-tightening member is provided on the upper cover to pre-tighten the first transmission column.

[0007] As a further improved technical scheme of the utility model, a second transmission column is arranged between the first transmission column and the piezoelectric disc, and a second damping sheet is arranged between the first transmission column and the second transmission column, and the second damping sheet is used to adjust the vibration frequency of the piezoelectric disc transmitted to the first transmission column.

[0008] As a further improved technical scheme of the utility model, the thickness of the first damping sheet / second damping sheet is 0.1-0.3mm.

[0009] As a further improved technical scheme of the utility model, the pre-tightening piece is a spring, the first transmission column comprises a first column body and a second column body connected together, the diameter of the first column body is smaller than the diameter of the second column body, the spring is sleeved outside the first column body and the excitation rod, one end of the spring abuts against the bottom surface of the upper cover, and the other end of the spring abuts against the upper surface of the second column body.

[0010] As a further improved technical scheme of the utility model, the spring is a rectangular spring.

[0011] As a further improved technical scheme of the utility model, the diameter of the second transmission column is consistent with the diameter of the second column body.

[0012] As a further improved technical scheme of the utility model, a guide copper ring is arranged on the upper cover, and the guide copper ring is used for guiding the reciprocating movement of the excitation rod.

[0013] As a further improved technical scheme of the utility model, an annular groove is arranged in the upper cover and takes a 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 excitation rod.

[0014] As a further improved technical scheme of the utility model, a groove is arranged on the upper cover and takes the annular groove as the center and is communicated with the annular groove, a pressing plate is arranged in the groove, and the pressing plate presses the guide copper ring.

[0015] As a further improved technical scheme of the utility model, at least two piezoelectric discs are arranged in a stack between the damping adjustment mechanism and the base.

[0016] The utility model has the beneficial effects that:

[0017] Through the above structure, the damping adjustment mechanism is arranged, the vibration frequency of the piezoelectric disc transmitted to the excitation rod is adjusted, the vibration frequency range that can be output by the piezoelectric exciter is expanded, vibration of a large number of levels is realized at high and low frequencies, the structure is simple, and the disassembly and assembly are convenient. BRIEF DESCRIPTION OF DRAWINGS

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

[0019] Figure 2 It is the sectional view of piezoelectric exciter;

[0020] Figure 3 It is the structure schematic view of excitation assembly;

[0021] Figure 4 It is Figure 2 The enlarged view of A in Fig.

[0022] Wherein: 1-top cover, 2-cylinder body, 3-base, 4-excitation rod, 501-first damping plate, 502-first transmission column, 5021-first column, 5022-second column, 503-second transmission column, 504-second damping plate, 505-spring, 6-piezoelectric disc, 7-support, 8-guide copper ring, 9-pressure plate, 10-outlet. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0024] If the description of this utility model involves directions (e.g., up, down, left, right, front, back, outside, inside, etc.), then the directions involved need to be defined. For example, "To clearly express the position and direction described in this utility model, the operator of the instrument is used as a reference, the end closer to the operator is the proximal end, and the end farther from the operator is the distal end." Or, the paper can be used as a reference. Of course, if the positional relationship between the two is defined by mutual reference in the subsequent description, then this definition is not required.

[0025] A frequency-adjustable piezoelectric exciter, such as Figures 1-2 As shown, the device includes a top cover 1, a cylinder 2, and a base 3 arranged in sequence. A through hole is provided on the top cover 1. An axially penetrating excitation space is provided within the cylinder 2. The extension direction of the excitation space is consistent with the arrangement direction of the top cover 1, cylinder 2, and base 3. The top cover 1, cylinder 2, and base 3 are coaxially arranged. An excitation assembly is provided within the excitation space. The output end of the excitation assembly extends out of the top cover 1 through the through hole. The excitation assembly is used to output 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 disc 6, and a support 7 arranged in sequence. The support 7 is mounted on the base 3. The excitation rod 4 extends from the excitation space into the upper cover 1. The damping adjustment mechanism can adjust the excitation force output by the piezoelectric disc 6. The damping adjustment mechanism includes a first damping plate 501 and a first transmission column 502 arranged in sequence. The first damping plate 501 is disposed between the excitation rod 4 and the first transmission column 502. The first damping plate 501 is used to adjust the vibration frequency transmitted from the piezoelectric disc 6 to the excitation rod 4. A pre-tightening member for pre-tightening the first transmission column 502 is provided on the upper cover 1.

[0027] As an embodiment of the utility model, the pre -tensioning spare is spring 505, first transmission column 502 includes first cylinder 5021 and second cylinder 5022 connected together, the diameter of first cylinder 5021 is less than the diameter of second cylinder 5022, spring 505 is set in the outside of exciting vibration rod 4 and first cylinder 5021, one end of spring 505 abuts the bottom surface of upper cover 1, the other end of spring 505 abuts the upper surface of second cylinder 5022. Preferably, the diameter of exciting vibration rod 4 is consistent with the diameter of first cylinder 5021. When working, alternating current high voltage is passed to piezoelectric disc 6, piezoelectric disc 6 generates up and down contraction and transmits vibration force to first transmission column 502, first transmission column 502 transmits force to exciting vibration rod 4 again, in this process, the elastic force of spring 505 is used to pre -tension first transmission column 502 and piezoelectric disc 6, according to different test requirements, the first damping sheet 501 of different quantity and / or thickness is designed, and the vibration frequency response transmitted to exciting vibration rod 4 is changed.

[0028] Second transmission column 503 is arranged between first transmission column 502 and piezoelectric disc 6, second damping sheet 504 is arranged between first transmission column 502 and second transmission column 503, and second damping sheet 504 is used to adjust the vibration frequency transmitted by piezoelectric disc 6 to first transmission column 502. The pre -tensioning force of first transmission column 502 and second transmission column 503 is used to the elastic force of spring 505, according to different test requirements, the second damping sheet 504 of different quantity and / or thickness is designed, and the vibration frequency response transmitted to first transmission column 502 is changed.

[0029] As an embodiment of the utility model, the structure of first damping sheet 501 and second damping sheet 504 is consistent, first damping sheet 501 / second damping sheet 504 is made of butyl rubber, and the thickness of first damping sheet 501 / second damping sheet 504 is 0.1-0.3mm. The damping sheet made of butyl rubber is tough and durable, can withstand high-intensity vibration and impact, can maintain stable performance in the long-term use process, is not easy to damage, is easy to maintain and replace, reduces downtime and maintenance cost.

[0030] As an embodiment of the utility model, spring 505 is rectangular spring. Rectangular spring has smaller volume, under the same space condition, the stiffness of spring with rectangular section is greater, and the absorbed energy is also greater, can withstand larger load, impact and high-speed amplitude, is suitable for occasions with limited space or requiring high-frequency vibration, and has good stability and fatigue strength, and can maintain stable performance in the long-term use process.

[0031] Generally, the greater the diameter, the greater the rigidity of the damping piece, the greater the resonance frequency, and vice versa, the smaller the diameter of the damping piece, the smaller the rigidity, the smaller the resonance frequency, so different resonance frequencies can be realized by using different rigidity of the damping piece, in application, the diameter of the first damping piece 501 is consistent with the diameter of the second transmission column 503, the diameter of the second damping piece 504 can be consistent with the diameter of the excitation rod 4 and the first column body 5021, the diameter of the second transmission column 503 can be consistent with the diameter of the second column body 5022 of the first transmission column 502, and the diameter of the first damping piece 501 is smaller than that of the second damping piece 504. The first damping piece 501 with smaller diameter can realize low-frequency response, and the second damping piece 504 with larger diameter can realize high-frequency response, thereby expanding the vibration frequency range that the piezoelectric exciter can output, realizing a large amount of vibration at high and low frequencies, and meeting the magnitude requirement of vibration test.

[0032] As an embodiment of the utility model, at least two piezoelectric discs 6 are stacked between the damping adjusting mechanism and the base 3. The piezoelectric disc 6 is made of piezoelectric material.

[0033] As an embodiment of the utility model, each component of the excitation assembly is bonded by epoxy resin, which 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 utility model, as shown in Figure 3 A through hole is provided on the upper cover 1, the through hole is used for reciprocating movement of the excitation rod 4, an annular groove is formed in the upper cover 1 with the through hole as the center, the annular groove is communicated with the through hole, a guide copper ring 8 is arranged in the annular groove, 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 movement of the excitation rod 4. The guide copper ring 8 can withstand large 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 away, 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 utility model, in order to facilitate the installation of the guide copper ring 8, a recess is provided on the upper cover 1, the recess is centered on the annular groove and communicated with the annular groove, a pressing plate 9 is arranged in the recess, the pressing plate 9 presses the guide copper ring 8, and a fastener is arranged between the pressing plate 9 and the upper cover 1 for connection, thereby improving the disassembly convenience of the guide copper ring 8.

[0036] A wire outlet 10 is formed in the lower part of the cylinder body 2, the wire outlet 10 is used for wiring and heat dissipation at the same time.

[0037] The adjustable frequency piezoelectric exciter provided by the utility model sets damping adjusting mechanism and transmission column, adjusts the vibration frequency of piezoelectric disc 6 transmitted to excitation rod 4, expands the vibration frequency range that piezoelectric exciter can output, and can realize relatively large magnitude vibration at high and low frequencies, and the structure is simple, convenient to disassemble and assemble.

[0038] It should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0039] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the utility model, and are not used to limit the protection scope of the utility model, and equivalent embodiments or changes made without departing from the spirit of the utility model art should be included in the protection scope of the utility model.

Claims

1. A frequency-adjustable piezoelectric vibration exciter, characterized in that: comprising a cover (1), a cylinder (2) and a base (3) arranged in sequence, a through hole is arranged on the cover (1), an axial through vibration space is arranged in the cylinder (2), a vibration rod (4), a damping adjustment mechanism, a piezoelectric disc (6) and a support (7) are arranged in sequence in the vibration space, the support (7) is arranged on the base (3), the vibration rod (4) extends out of the cover (1) from the vibration space through the through hole, the damping adjustment mechanism comprises a first damping sheet (501) and a first transmission column (502), the first damping sheet (501) is arranged between the vibration rod (4) and the transmission column, and the first damping sheet (501) is used for adjusting the vibration frequency of the piezoelectric disc (6) transmitted to the vibration rod (4); and a pre-tightening piece for pre-tightening the first transmission column (502) is arranged on the cover (1).

2. The frequency-adjustable piezoelectric vibration exciter according to claim 1, characterized in that: a second transmission column (503) is arranged between the first transmission column (502) and the piezoelectric disc (6), and a second damping sheet (504) is arranged between the first transmission column (502) and the second transmission column (503), and the second damping sheet (504) is used for adjusting the vibration frequency of the piezoelectric disc (6) transmitted to the first transmission column (502).

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

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

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

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

7. The frequency-adjustable piezoelectric vibration exciter according to claim 1, characterized in that: a guide copper ring (8) is arranged on the cover (1), and the guide copper ring (8) is used for guiding the reciprocating movement of the vibration rod (4).

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

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

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

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