RU73637U1 - ULTRASONIC WRENCH - Google Patents

Abstract

The objective of the invention is to increase the efficiency of an ultrasonic wrench due to a more complete use of ultrasonic energy. An ultrasonic wrench comprises a piezoceramic transducer 1 clamped with a pin 2 between a hub 3 and a housing 4 with a ferrule 5 provided with a square 6 for fixing the handle (not shown in the drawing). To reduce the level of vibration transmitted to the clip 5 and the handle, a vibration-isolating washer 7 is placed between the end face of the housing 4 and the clip 5. The outer side surface of the upper part of the housing 4, as well as the inner wall of the clip 5, have the shape of a polyhedron. The lower part of the housing 4 is made in the form of a torsion 8, which is a glass with inclined grooves 9 on its generatrix. The working end of the rod-hub 3 interacts with a bolt 10, on the nut 11 of which a tip 12 is worn, the internal faces mating with the lower part of the torsion bar 8.

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 installation and mechanical assembly work in various industries.

Known screwdriver tool with a source of ultrasonic vibrations [1], equipped with a device that tells the tool ultrasonic vibrations with a frequency of 20 ... 60 kHz and an amplitude of 0.005 ... 0.1 mm The device can be mounted in a tool or attached to it. The source of ultrasonic vibrations can be, for example, a package of nickel plates, which are driven into oscillations under the influence of high frequency currents.

The disadvantage of this device is not high enough efficiency due to the uniaxial action of ultrasonic vibrations.

Closest to the claimed device in technical essence is a device for disassembling threaded joints [2], comprising a housing with a handle, a vibration isolator placed between them, a piezoceramic transducer located in the housing, a tip, a torsion bar connected to a piezoceramic transducer located inside the torsion bar and facing the threaded the connection with a rod, which is a vibration concentrator, the tip is connected to the free end of the torsion bar, and the piezoceramic transducer is made in ide packet annular elements.

The disadvantage of the described device is the insufficiently high operating efficiency due to the fact that only half of the ultrasonic energy generated by the piezoceramic transducer is used to disassemble the threaded connection, its second half

dissipated in the housing and does not participate in the process of disassembling the threaded connection.

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

The technical result is achieved by the fact that in an ultrasonic wrench containing a housing with a handle, a vibration isolator placed between them, a piezoceramic transducer located in the housing, made in the form of a package of ring-shaped elements, a rod representing a vibration concentrator, a torsion bar and a tip connected with its free end torsion bar mounted on the body.

As a distinctive feature in the inventive device used the fastening of the torsion bar on the body. This distinguishing feature to achieve the task, namely, to increase work efficiency due to the more complete use of ultrasonic energy, was not used in other devices known to the authors, which confirms the compliance of the claimed device with the criteria of the invention of "novelty".

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

An ultrasonic wrench contains a piezoceramic transducer 1 clamped with a pin 2 between a hub 3 and a housing 4 with a holder 5, equipped with a square 6 for fixing the handle (not shown in the drawing). To reduce the level of vibration transmitted to the clip 5 and the handle, a vibration-isolating washer 7 is placed between the end face of the housing 4 and the clip 5. The outer side surface of the upper part of the housing 4, as well as the inner wall of the clip 5, have the shape of a polyhedron. The lower part of the housing 4 is made in the form of a torsion 8, which is a glass with inclined grooves 9 on its generatrix. The working end of the rod-hub 3 interacts with a bolt 10, on the nut 11 of which a tip 12 is worn, the internal faces mating with the lower part of the torsion bar 8.

An ultrasonic wrench works as follows. When applying a sinusoidal voltage and resonant frequency to the plates of a packet piezoelectric transducer 1 from a generator (not shown), it, changing its geometrical dimensions due to the inverse piezoelectric effect, excites mechanical vibrations of the concentrator rod 3, housing 4 and tip 12. In this case, the rod the concentrator 3 is excited by one end of the batch piezoelectric transducer 1, and the housing 4 and the tip 12 - its second end. Being tightened to the end face of the bolt 10, the hub hub 1 provides a longitudinal vibrational effect on it. The longitudinal vibrations of the second end of the batch piezoceramic transducer 1 are transmitted in the form of a deformation wave to the housing 4. Due to the fact that the reflection coefficient of ultrasonic energy during the transition from medium to medium is proportional to the difference in the densities of these media, an almost complete ultrasonic reflection occurs at the boundary of body 4 - vibration isolation washer 7 energy from the upper end of the housing 4. As a result, the vibrations of the lower part of the housing 4 and the torsion 8 are excited, the inclined grooves 9 of which provide torsional natural oscillations bottom of the torsion bar 8 and the tip 12, which interacts with nut 11, provides its unscrewing. To exclude damping of longitudinal vibrations of the upper part of the housing 4, its pairing with the cage 5 is carried out along the lateral edges (Fig. 2), and the screws of the casing 5 on the casing 4 are located in the zone of the nodal line of zero amplitude. 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.

The authors implemented the inventive device based on a batch piezoelectric transducer of four washers of piezoelectric ceramics type TsTS-19. An even number of electrically parallel assembled washers makes it possible to have a piezoceramic batch on the outer plates

the transducer has the same potential, which eliminates the possibility of a short circuit of the power source through the elements of the device and simplifies the task of electrical insulation of the plates of the packet piezoelectric transducer from the rod - hub and housing. The structural elements of the device are partially made of 65G high-elastic steel and heat-treated duralumin D16T. 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 40-50% to increase the efficiency of its work due to a more complete use of ultrasonic energy.

Information sources

1. Pat. 3443180 Germany. IPC B23B 28/00, Ultraschal-Werkzeug / P. Wolter, G. Malisius (Germany). 11/27/84; Publ. 05/28/86

2. A.S. 1608035 USSR. IPC B25 B 21/00. A method of disassembling threaded joints 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.

Claims (1)

An ultrasonic wrench, comprising a housing with a handle, a vibration isolator placed between them, a piezoceramic transducer located in the housing, made in the form of a package of ring-shaped elements, a rod representing an oscillation concentrator, a torsion bar and a tip connected with its free end face, characterized in that the torsion bar is mounted on case.