Piezoelectric type electric vibration table

Abstract

The utility model provides a piezoelectric type electric vibration table comprising a table body, the table body comprises a top cover and a base, the top cover and the base are connected along the axial direction, and the table body is hollow to form an accommodating part; the excitation output shaft comprises a shaft rod, a shaft body and a limiting rod which are sequentially connected in the axial direction, the shaft rod penetrates through the top cover in the axial direction, and the shaft body and the limiting rod are located in the containing part; the piezoelectric ceramic is located between the shaft body and the top cover in the axial direction, and a receding hole for the shaft rod to penetrate through is formed in the piezoelectric ceramic; and the pre-tightening spring is arranged between the base and the shaft body along the axial direction. According to the piezoelectric type electric vibration table, the piezoelectric ceramic is arranged at the position close to the excitation output surface, so that the vibration excitation transmission is stronger, and the distortion degree of the output waveform is lower.

Description

TECHNICAL FIELD

[0001] The utility model relates to a piezoelectric electric vibration table. BACKGROUND

[0002] The traditional piezoelectric vibration table adopts a bottom-up longitudinal stacking structure, and the core components thereof are piezoelectric ceramic sheets, pre-tightening springs and excitation output shafts in sequence along the axial direction. This design causes the piezoelectric ceramic sheets to indirectly transmit vibration energy through multiple mechanical structures: the piezoelectric ceramic sheets, which convert high-frequency electrical signals into mechanical vibrations, need to transmit the vibrations to the shaft body through the axial compression deformation of the pre-tightening springs, and then transmit the vibrations to the external load through the shaft rod. However, such a structure causes distortion due to the redundant energy transmission path. The piezoelectric ceramic sheets, as the vibration source, are located at the lowermost end of the system, and the axial vibrations generated thereby need to be transmitted to the shaft body after being attenuated and adjusted by the pre-tightening springs. Due to the nonlinear elastic deformation of the spring elements, phase lag and amplitude attenuation occur, especially at high-frequency excitation (>1 kHz), which causes distortion of the vibration waveform.

[0003] Therefore, it is necessary to improve the existing piezoelectric electric vibration table to solve the above problems. SUMMARY

[0004] The utility model discloses a piezoelectric electric vibration table, which solves the problem of distortion of the existing vibration table.

[0005] To achieve the above-mentioned purpose, the utility model provides a piezoelectric electric vibration table, which comprises:

[0006] A table body comprising a top cover and a base, the top cover and the base being connected along the axial direction, the table body being hollow to form a receiving portion;

[0007] An excitation output shaft comprising a shaft rod, a shaft body and a limiting rod connected in sequence along the axial direction, the shaft rod penetrating the top cover along the axial direction, the shaft body and the limiting rod being located in the receiving portion;

[0008] A piezoelectric ceramic located between the shaft body and the top cover along the axial direction, the piezoelectric ceramic being provided with a clearance hole for the shaft rod to pass through;

[0009] A pre-tightening spring arranged between the base and the shaft body along the axial direction, the pre-tightening spring being provided with a limiting groove on the side facing the shaft body, and the limiting rod protruding in the limiting groove.

[0010] As a further improvement of the utility model, the top cover comprises an upper cover body and a middle cover body, the middle cover body being located between the upper cover body and the base, and the upper cover body being provided with an output hole for the shaft rod to pass through.

[0011] As a further improvement of the utility model, the piezoelectric ceramic is connected with an electricity connection lead, and the upper cover body is provided with a guide hole through which the electricity connection lead passes.

[0012] As a further improvement of the utility model, the piezoelectric electric vibration table further comprises a guide shaft sleeve, and the guide shaft sleeve is located between the shaft body and the middle cover body in the radial direction.

[0013] As a further improvement of the utility model, the upper cover body is fixedly connected with the shaft body, and the middle cover body is fixedly connected with the base.

[0014] As a further improvement of the utility model, the pre-tightening spring is a rubber spring.

[0015] As a further improvement of the utility model, a screw hole is formed in the side of the pre-tightening spring away from the shaft body, and the piezoelectric electric vibration table further comprises a fixing screw penetrating through the base and connected with the screw hole.

[0016] As a further improvement of the utility model, the pre-tightening spring and the base are arranged in the radial direction to form a heat dissipation cavity.

[0017] As a further improvement of the utility model, the base is provided with a heat dissipation flow channel in communication with the heat dissipation cavity.

[0018] As a further improvement of the utility model, the piezoelectric electric vibration table further comprises a heat dissipation fan, and the heat dissipation fan is arranged adjacent to the heat dissipation flow channel.

[0019] The piezoelectric electric vibration table has the advantages that the piezoelectric ceramic is arranged close to the excitation output surface, vibration excitation transmission is stronger, and output waveform distortion is lower. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application. In the drawings:

[0021] Figure 1 is a perspective structural schematic view of the piezoelectric electric vibration table of the utility model;

[0022] Figure 2 is a side structural schematic view of the piezoelectric electric vibration table of the utility model;

[0023] Figure 3 is Figure 2 is a sectional structural schematic view in the direction of A-A of the middle cover body;

[0024] Figure 4It is the exploded structural schematic diagram of piezoelectric electric vibration table of the utility model. DETAILED DESCRIPTION

[0025] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0026] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the drawing shown, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] As Figures 1 to 4 Indicated, the piezoelectric electric vibration table 100 of the utility model includes the table body 1, the excitation output shaft 2, the piezoelectric ceramic 3, the pre-tightening spring 4, the heat dissipation fan 5, the guide shaft sleeve 6 and the fixing screw 7.

[0029] The table body 1 includes the top cover 11 and the base 12, further, the top cover 11 includes the upper cover body 111 and the middle cover body 112.

[0030] Among them, the upper cover body 111 and the middle cover body 112 are both columnar, and the base 12 is cuboid, but it is not limited to this, and can be adjusted according to actual needs.

[0031] The top cover 11 and the base 12 are connected in the axial direction, the table body 1 is hollow to form a receiving part 13, more specifically, the receiving part 13 is located in the base 12 and the middle cover body 112, and the upper cover body 111 closes the receiving part 13 in the axial direction.

[0032] The middle cover body 112 is located between the upper cover body 111 and the base 12. The upper cover body 111 is fixedly connected with the shaft body 22, and the middle cover body 112 is fixedly connected with the base 12.

[0033] The excitation output shaft 2 is a core transmission system, comprising an axle 21, a shaft body 22 and a limiting rod 23 connected in sequence in the axial direction, and the axle 21, the shaft body 22 and the limiting rod 23 are coaxially arranged.

[0034] The axle 21 penetrates the top cover 11 in the axial direction, and the shaft body 22 and the limiting rod 23 are located in the receiving part 13.

[0035] The upper cover body 111 is provided with an output hole 113 through which the axle 21 penetrates, and a plurality of heat dissipation air duct holes 114 arranged around the output hole 113. The heat dissipation air duct holes 114 are in communication with the receiving part 13.

[0036] The piezoelectric ceramic 3 is an energy conversion module that converts electrical energy into mechanical energy. The piezoelectric ceramic 3 is located between the shaft body 22 and the top cover 11 in the axial direction, and the piezoelectric ceramic 3 is provided with a gap hole 32 through which the axle 21 penetrates. In this embodiment, the axle 21 penetrates the gap hole 32 and the output hole 113 in sequence to connect with the external table body 1.

[0037] The piezoelectric ceramic 3 is connected with an electrically connected lead-out wire 31, and the upper cover body 111 is provided with a guide hole through which the electrically connected lead-out wire 31 penetrates. In this embodiment, the guide hole is arranged on the side wall of the upper cover body 111.

[0038] In this embodiment, the piezoelectric ceramic 3 is close to the output surface, which reduces the distortion of the transmission.

[0039] The pre-tightening spring 4 is arranged in the axial direction between the base 12 and the shaft body 22, and a limiting groove 41 is formed on the side of the pre-tightening spring 4 facing the shaft body 22, and the limiting rod 23 protrudes in the limiting groove 41.

[0040] In this embodiment, the pre-tightening spring 4 is a rubber spring. The rubber spring has low rigidity, accurate pre-tightening force control, good stability, and does not affect the distortion of the waveform output. That is, the rubber spring can ensure stable pre-tightening force and good damping characteristics.

[0041] The pre-tightening spring 4 is provided with a threaded hole 42 on the side away from the shaft body 22, and the piezoelectric electric vibration table 100 further comprises a fixing screw 7 connected through the base 12 and the threaded hole 42.

[0042] The guide shaft sleeve 6 is located between the shaft body 22 and the middle cover body 112 in the radial direction, and is used to achieve radial positioning and make the excitation output shaft 2 rotate more smoothly.

[0043] The guide shaft sleeve 6 divides the receiving part 13 into two spaces, and the heat dissipation air duct is in communication with the upper receiving part 13 to dissipate heat for the piezoelectric ceramic 3.

[0044] The pre-tightening spring 4 and the base 12 are arranged in the radial direction to form a heat dissipation cavity 121, and the base 12 is provided with a heat dissipation flow channel 122 in communication with the heat dissipation cavity 121.

[0045] The number of the heat dissipation flow channels 122 is two, and in some embodiments, the base 12 can be further provided with a return air flow channel in communication with the heat dissipation cavity 121 to improve the heat dissipation effect.

[0046] The piezoelectric electric vibration table 100 of the utility model, through setting piezoelectric ceramic 3 in the position close to the excitation output surface, vibration excitation transmission is stronger, and output waveform distortion degree is lower, through setting pre-tightening spring 4 made of rubber material, elasticity is good, compression and pre-tightening force linearity is high, and pre-tightening force size accuracy is high.

[0047] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the present application.

[0048] The above-described embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which are within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A piezoelectric electrodynamic vibration table, characterized by: The piezoelectric electric vibration table comprises: a table body comprising a top cover and a base connected in an axial direction, the table body being hollow to form a receiving part; an excitation output shaft comprising a shaft rod, a shaft body and a limiting rod connected in an axial direction, the shaft rod penetrating the top cover in an axial direction, the shaft body and the limiting rod being located in the receiving part; a piezoelectric ceramic located between the shaft body and the top cover in an axial direction, the piezoelectric ceramic being provided with a clearance hole for the shaft rod to pass through; a pre-tightening spring arranged between the base and the shaft body in an axial direction, the pre-tightening spring being provided with a limiting slot on a side facing the shaft body, the limiting rod protruding in the limiting slot.

2. The piezoelectric electrodynamic vibration table according to claim 1, characterized in that: The top cover comprises an upper cover body and a middle cover body, the middle cover body being located between the upper cover body and the base, the upper cover body being provided with an output hole for the shaft rod to pass through.

3. The piezoelectric electrodynamic vibration table according to claim 2, characterized in that: The piezoelectric ceramic is connected with an electric connection lead, the upper cover body being provided with a guide hole for the electric connection lead to pass through.

4. The piezoelectric electrodynamic vibration table according to claim 2, characterized in that: The piezoelectric electric vibration table further comprises a guide shaft sleeve located between the shaft body and the middle cover body in a radial direction.

5. The piezoelectric electrodynamic vibration table according to claim 2, characterized in that: The upper cover body is fixedly connected with the shaft body, and the middle cover body is fixedly connected with the base.

6. The piezoelectric electrodynamic vibration table of claim 1, wherein: The pre-tightening spring is a rubber spring.

7. The piezoelectric electrodynamic vibration table according to claim 6, characterized in that: A screw hole is formed on a side of the pre-tightening spring away from the shaft body, and the piezoelectric electric vibration table further comprises a fixing screw penetrating the base and connected with the screw hole.

8. The piezoelectric electrodynamic vibration table of claim 1, wherein: The pre-tightening spring and the base are arranged in a radial direction to form a heat dissipation cavity.

9. The piezoelectric electrodynamic vibration table according to claim 8, characterized in that: A heat dissipation flow channel is formed on the base and communicates with the heat dissipation cavity.

10. The piezoelectric electrodynamic vibration table according to claim 9, characterized in that: The piezoelectric electric vibration table further comprises a heat dissipation fan arranged adjacent to the heat dissipation flow channel.

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