CN2369440Y

CN2369440Y - Large power ultrasonic transducer

Info

Publication number: CN2369440Y
Application number: CN 99235387
Authority: CN
Inventors: 冯典昭; 戴光
Original assignee: CHANGXING ELECTRONIC MANUFACTURING Co Ltd DALIANG TOWN SHUNDE CITY
Current assignee: CHANGXING ELECTRONIC MANUFACTURING Co Ltd DALIANG TOWN SHUNDE CITY
Priority date: 1999-02-10
Filing date: 1999-02-10
Publication date: 2000-03-15
Anticipated expiration: 2009-02-10

Abstract

The utility model relates to a large power ultrasonic transducer which comprises a front loading block, a back loading block, piezoelectric ceramic pieces and an electrode piece, wherein the piezoelectric ceramic pieces are tightly pressed between the front loading block and the back loading block; one end of the back loading block of the utility model is provided with a nut counter bore; a compression nut is arranged in the nut counter bore; the surface of the front loading block is provided with axial arc heat-radiation grooves which are uniformly distributed. The utility model not only ensures the thickness of the back loading block to cause serious warpage vibration to be not generated when the utility model operates, but also ensures the uniform contact pressure of the piezoelectric ceramic pieces. The utility model increases the electromechanical coupling factor, reduces the heat generation of internal loss and increases the output efficiency. The utility model has the advantages of high output efficiency and small heating quantity, and can continuously operate under the drive of high power.

Description

Large-power supersonic transducer

The utility model relates to a kind of large-power supersonic transducer that mainly is applicable to ultrasonic vibration processing equipments such as various metals, Plastic Welding and vibration wire drawing.

In the prior art, large-power supersonic transducer all exist the life-span short, electro-acoustic conversion efficiency is low, easy heating, causes operating frequency drift after the heating, make machine can't operate as normal etc. shortcoming.Trace it to its cause, or because the back loading piece directly screws in (as shown in Figure 4) behind the screw rod, itself and the contact-making surface run-off the straight of piezoelectric ceramic piece cause pressure inhomogeneous, make piezoelectric ceramic piece produce in-fighting and generate heat, and severe patient is cracked because of the mutual percussion of piezoelectric ceramic piece; Or owing to use independently nut to compress (as shown in Figure 5) behind the back loading piece, back loading piece attenuate, back loading power is weakened and takes place the warpage vibration extremely.Simultaneously, the excessive problem of stress also takes place in piezo ceramic element under powerful driving.

The purpose of this utility model aims to provide a kind of simple in structure, delivery efficiency is high, caloric value is little large-power supersonic transducer, to overcome the deficiencies in the prior art part.

By the large-power supersonic transducer of this purpose design, comprise forward and backward load piece and be pressed on therebetween piezoelectric ceramic piece and electrode slice with screw rod, its architectural feature is that an end of back loading piece is provided with the nut counterbore, clamp nut places described counterbore.Described nut is circular, the thickness of nut≤1/20 wavelength, and nut stretches out back loading piece end face≤1/100 wavelength.Load piece surface is provided with radiating groove before described, and is generally uniform axial arc radiating groove.

This ultrasonic transducer adopts round nut to be anchored on structure in the counterbore of back loading piece, and the external diameter of nut is slightly less than counter bore hole diameters, and the quality that reduces is thus supplied by the part that nut and screw rod stretch out the back loading piece.So both guarantee the thickness of back loading piece, and can not produce serious warpage vibration when making its work, guaranteed again that the piezoelectric ceramic piece contact pressure was even, increased electromechanical coupling factor, reduced the in-fighting heating, improved delivery efficiency.The arc radiating groove that preceding load piece is provided with had both guaranteed its elastic stretching intensity, made it have cumulative action preferably again, made output obtain higher amplitude, had also increased area of dissipation.Before the arc transition district that is provided with of the output of load piece, make its can and the luffing bar between also improved because of the caused problem of stress concentration of ladder transition when obtaining good impedance match.This product delivery efficiency height, caloric value is little, can be in continuous operation under the high-power driving.

Accompanying drawing is an embodiment of the present utility model.

Fig. 1 is the structure of ultrasonic transducer schematic diagram;

Fig. 2 is the left view of Fig. 1.

Fig. 3 is this transducer and the syndeton schematic diagram of luffing bar, weldering mould.

Fig. 4 is existing screw rod interconnection system transducer architecture schematic diagram.

Fig. 5 is existing rearmounted nut type transducer architecture schematic diagram.

Referring to Fig. 1-Fig. 3, alternate between preceding load piece 6 and back loading piece 3 piezoelectric ceramic piece 4 and electrode slice 5 are set, and it are compressed with center bolt 1 and clamp nut.One end of back loading piece 3 is provided with the nut counterbore, and clamp nut 2 places described counterbore.Described nut is circular, and its thickness is≤1/20 wavelength, and nut stretches out back loading piece end face≤1/100 wavelength.Preceding load piece surface is provided with uniform axial arc radiating groove 7, is generally the 4--8 bar, distance 〉=preceding load piece small end external diameter between its bottom land.The rear end diameter and the piezoelectric ceramic piece diameter of preceding load piece are complementary; Its front end is provided with rounding off district 8 and carries out the transition to small end, makes it to mate with luffing bar 9 diameters.10 is soldering tip among the figure, and 11 is cushion rubber, and 12 is center bolt.

Claims

1. large-power supersonic transducer, comprise forward and backward load piece (6,3) and be pressed on therebetween piezoelectric ceramic piece (4) and electrode slice (5) with center bolt (1), an end that it is characterized in that the back loading piece is provided with the nut counterbore, and clamp nut (2) places described counterbore.

2. large-power supersonic transducer as claimed in claim 1, load piece (6) surface is provided with radiating groove (7) before it is characterized in that.

3. large-power supersonic transducer as claimed in claim 1 is characterized in that described clamp nut (2) is for circular.

4. as claim 1 or 3 described large-power supersonic transducers, the thickness of its feature clamp nut (2) is≤1/20 wavelength, and nut stretches out back loading piece end face≤1/100 wavelength.

5. large-power supersonic transducer as claimed in claim 2, the uniform axial arc radiating groove in load piece surface before it is characterized in that.

6. as claim 2 or 5 described large-power supersonic transducers, the rear end diameter and the piezoelectric ceramic piece diameter of load piece are complementary before it is characterized in that; Its front end is provided with rounding off district (8) and carries out the transition to small end, makes it to mate with luffing bar (9) diameter.

7. large-power supersonic transducer as claimed in claim 5, load piece surface is provided with 4--8 bar radiating groove before it is characterized in that, and distance 〉=preceding load piece small end external diameter between at the bottom of the radiating groove.