RU93323U1 - ULTRASONIC WRENCH - Google Patents

Abstract

 An ultrasonic screwdriver containing a housing with a handle, a piezoceramic transducer located in the housing, with which the first torsion is rigidly connected with one end, inside which is a rod representing an oscillation concentrator, a second torsion mounted on the housing and a tip connected with its free end with internal faces the tip is connected to the free end of the first torsion bar, characterized in that the tip is made with external faces conjugated with the free end of the second torsion bar, and the grooves of the first and the second torsion bar are made with the opposite orientation.

Description

The utility model relates to mechanical engineering, namely, to portable portable tools with a power drive, designed to assemble and disassemble threaded joints that are corroded or located in hard-to-reach places, and can also be used to mechanize assembly and mechanical assembly work in various industries.

Known ultrasonic wrenches [1, 2], containing a housing with a handle, a tip, a piezoceramic transducer located in the housing, with which a torsion is rigidly connected with one end, inside which a rod is a vibration concentrator, a free end of the first torsion is mated to the inner faces of the tip

The disadvantage of this device is the lack of efficiency due to the uniaxial action of ultrasonic vibrations and only half of the ultrasonic energy generated by the piezoceramic transducer is used to disassemble the threaded connection, its second half is dissipated in the housing and is not involved in the disassembly of the threaded connection.

Closest to the claimed device in technical essence is an ultrasonic wrench [3], comprising a housing with a handle, a piezoceramic transducer located in the housing, to which a rod is rigidly connected, which is a vibration concentrator, a torsion bar mounted on the housing and a tip connected to its free end.

The disadvantage of the described device is the insufficiently high operating efficiency due to the fact that the torsional vibrations supplied to the nut are generated (formed) only by the upper part of the piezoceramic transducer, the lower part of which interacts with the rod, which is a hub that generates only longitudinal vibrations.

The objective of the invention is to increase operating efficiency due to a more complete use of ultrasonic vibrational energy.

The technical result is achieved in that in an ultrasonic wrench containing a housing with a handle, a piezoceramic transducer located in the housing, with which the first torsion is rigidly connected with one end, inside which is a rod representing an oscillation concentrator, a second torsion mounted on the housing and a tip associated with its free end face, with the inner faces of the tip mating the free end of the first torsion bar, additionally the tip is made with external faces mating with the free the end face of the second torsion bar, and the grooves of the first and second torsion bar are made with the opposite orientation.

As distinctive features in the claimed device used the implementation of the tip with external and internal faces, the introduction of a new connection (the second torsion is paired with the external faces of the tip), and, in addition, the grooves of the first and second torsion bars are made in the opposite orientation. These distinguishing features to achieve the task, namely, to increase work efficiency due to the fuller use of ultrasonic energy, were not used in other devices known to the authors, which confirms the compliance of the claimed device with the “novelty” criterion of the invention.

Figure 1 presents a sectional ultrasonic wrench, figure 2 is a section along aa.

An ultrasonic wrench contains a piezoceramic batch transducer 1 composed of discrete axial polarization washers and clamped with a pin 2 between the housing 3 and the frequency-reducing element 4, for which the first torsion 5 and hub 6 are made integrally. To transmit torsional vibrations from the first torsion 5 to nut 7, the device is equipped with a tip 8, with the inner faces of which the lower torsion 5 interacts with the lower part. The end face of the hub 6 interacts with the bolt 9. An adapter 10 s is fixed to the housing 3 a square 11 that serves to fix the lever (not shown in the drawing). The lower part of the housing 3 is made in the form of a second torsion 12, which is a glass with inclined grooves on its generatrix. The lower part of the second torsion 12 is conjugated with the outer edges of the tip 8. The inclined grooves of the first torsion 5 and the inclined grooves of the second torsion 12 are made in the opposite orientation.

An ultrasonic wrench works as follows.

The tip 8 is installed on the nut 7, while the end of the hub 6 is pressed against the end of the bolt 9. The lower part of the first torsion 5 is inserted into the inner part of the tip 8, and the lower part of the second torsion 12 is put on the outer edges of the tip 8. When supplied from the generator (in the drawing not shown) the voltage of the sinusoidal shape and the resonant frequency on the plates of the batch piezoelectric transducer 1, he, changing due to the inverse of the piezoelectric effect its geometric dimensions, excites mechanical vibrations of the frequency-decreasing element 4 and mechanically connected with it the first torsion bar 5 and hub 6, which amplifies the longitudinal mechanical vibrations in amplitude and transfers them due to frictional contact to the bolt 9. The presence of inclined grooves on the lateral surfaces of the first torsion bar 5 leads to excitation along with longitudinal vibrations torsional, transmitted through the tip 8 to the nut 7. The second (upper) end of the batch piezoceramic transducer 1 excites longitudinal vibrations of the housing 3 and the second torsion 12 mechanically connected to it , on the lateral surfaces of which inclined grooves are made, the orientation of which is opposite to the grooves of the first torsion 5. As a result, the vibrations of the housing 3 and the second torsion 12 are excited, the inclined grooves of which provide additional torsional vibrations of the tip 8, which, interacting with the nut 7, ensures its turning ( or puff).

Due to the inverse piezoelectric effect, ½ part of the oscillation period, the packet piezoceramic transducer 1 increases its dimensions in the axial direction, which leads to the first torsion 5 and the concentrator 6 moving down, and the housing 3 and the second torsion 12 are moved upward, respectively. In the next ½ part of the oscillation period, the packet piezoceramic transducer 1 reduces its dimensions in the axial direction, which leads to the first torsion 5 and the concentrator 6 moving up, and the housing 3 and the second torsion 12 are moved down. In this regard, for the formation of torsion vibrations of the same direction by torsions, it is necessary to perform the grooves in the first and second torsions oriented oppositely to each other.

Thus, in the inventive device for the vibration effect on the disassembled threaded connection uses almost all of the ultrasonic energy generated by the packet piezoceramic transducer. (In order to reduce the transmission of vibrations from the housing 3 to the adapter 10 and the square 11, it is possible to place a vibration-isolating gasket between them).

The authors implemented the inventive device based on a batch piezoelectric transducer of four washers of piezoelectric ceramics type TsTS-19, and the washers were connected mechanically in series and electrically in parallel. An even number of electrically parallel assembled washers makes it possible to have the same potential on the outer plates of the packet piezoceramic transducer, which eliminates the possibility of a short circuit of the power source through the device elements and simplifies the task of electrically isolating the piezoceramic transducer plates from the concentrator rod and the housing. The structural elements of the device are partially made of 65 G high-elastic steel and heat-treated D16T duralumin. The resonant frequency of the device is - 16750 Hz. The supply voltage of the batch piezoelectric transducer is 200 V.

The use of the claimed device allows in comparison with the prototype by 10-15% to increase the efficiency of its work due to a more complete use of ultrasonic energy.

Information sources

1. A.S. 1608035 USSR. IPC V25V 21/00. A method of disassembling threaded connections and a device for its implementation / A.A. Lukoševičius, L.R. Potashene, K.M. Ragulskis (USSR), - No. 620103 / 25-28; Claim 12/13/88; Publ. 11/23/90; Bull. No. 43.

2. RF patent No. 21114728. IPC V25V 21/00. The method of disassembling threaded connections / Kolokoltsev V.M., Shuvaev V.G., No. 95105106/28; Claim 04/05/95; Publ. 07/10/98. Bull. No. 19.

3. Certificate of the Russian Federation for utility model No. 73637 MPK V25V 21/00. Ultrasonic wrench / Shuvaev V.G., Papshev V.A., Shuvaev I.V., Kuznetsov MB, Application: 2007146168/22, 12/11/2007; Publ. 05/27/2008

Claims (1)

An ultrasonic screwdriver containing a housing with a handle, a piezoceramic transducer located in the housing, with which the first torsion is rigidly connected with one end, inside which is a rod representing an oscillation concentrator, a second torsion mounted on the housing and a tip connected with its free end with internal faces the tip is connected to the free end of the first torsion bar, characterized in that the tip is made with external faces conjugated with the free end of the second torsion bar, and the grooves of the first and the second torsion bar are made with the opposite orientation.