JPS60188213A - Supersonic body conveying system - Google Patents

Abstract

PURPOSE:To make a nonconveyance body conveyable in a specified direction with a standing wave utilized, by installing a noncontact part having a specific wavelength and a contact part with the nonconveyance body both in a sonic propagation body, in case of transferring a conveyed body after getting supersonic waves radiatively propagated to the sonic propagation body. CONSTITUTION:A bolt-clamped piezo-vibrator 6 is attached to one end of a long sonic propagation body 5A, and this vibrator is excited by a high frequency power source 7. With this excitation, a standing wave by longitudinal vibration is produced in the sonic propagation body 5A. In this case, driving force shown in an arrow turns to such a motion concentrated on a nodal point P of each vibration and thereby a direction of the driving force is reversed every lambda/4. Therefore, in order to make unnecessary directional driving force untransmitted to a conveyed body 8, a noncontact part 10 of lambda/4 in length and a contact part of lambda/4 in length, which makes contact with the conveyed body 8 (more than lambda/4 in overall length) are alternately installed on a driving force transmission surface of the sonic propagation body 5A. With this constitution, the conveyed body 8 is conveyed in a specified direction.

Description

Detailed Description of the Invention (Technical Field) The present invention generates a standing wave of ultrasonic waves in a rod-shaped or plate-shaped sound wave propagation body, and uses this standing wave to attack an object on the sound wave propagation body. This invention relates to an ultrasonic object transport method.

(Prior art and its problems) Recently, many reports have been made regarding the use of ultrasound to transport objects. All of these focus on how to create traveling waves of ultrasonic waves. In other words, when there is a standing wave in a sound wave propagating body, the amplitude distribution is fixed in the longitudinal direction of the sound wave propagating body, and the wave does not progress over time. In ultrasonic object transport systems that utilize traveling waves, such as the conventional ultrasonic transport system, if a standing wave is formed, the transported object cannot be driven to the left or right. Therefore, at the other end of the excitation source,
Measures have been taken to absorb elastic waves caused by reflection from the ends of sound propagating bodies.

In addition, in the linear conveyance method, the conveyed object (sound wave propagation body)
Many of them use the bending mode, and the cross-sectional area of the transported object is limited, which poses a problem in transporting heavy objects.

(Purpose of the Invention) Therefore, the present invention makes it possible to transport objects by actively utilizing standing waves generated in a sound wave propagating body, and has a simple structure capable of transporting large objects. This paper attempts to provide a sonic object transport system.

(Detailed Description of the Invention) Generally, a sound wave propagating body that is an elastic body (for example, a square bar, a round bar,
In the case of longitudinal vibration of a plate (such as a thick plate), deformation as shown in FIG. 1(A) occurs. In the figure, the solid line 1 indicates the steady state of the sound wave propagation body, the dashed line 2 indicates the state 1 when it is stretched, and (u3 indicates the state when it is compressed).Also, the arrow X indicates the longitudinal direction of the sound wave propagation body. , arrow Y is the radial direction (lateral direction), and λ is the wavelength determined by the excitation frequency of the ultrasonic wave and the sound speed within the sound wave propagation body.

Moreover, FIG. 1(B) shows the stress distribution in the longitudinal direction of the sound wave propagating body, and FIG. 1(C) shows the vibration distribution. As shown in these figures, the stress is maximum at the vibration node P, the vibration is zero at the node P, and increases toward both ends.

As is clear from Figure 1 (A>, (B), and (C)), when the elastic sound wave propagating body is assumed to be a round bar, deformation in the longitudinal direction and deformation in the radial direction occur simultaneously. Therefore, as shown in Fig. 2, the movement of point aJ1c on the surface of the sound wave propagator changes to the force that gathers at the vibration node P. However, the outline line 1 in the figure
shows the steady state of the sound wave propagating body, the outer shape m2 shows the state when expanded, and the outer shape 13 shows the state when compressed.

In view of the above, as shown in FIG. 3, a bolted piezoelectric vibrator (Langevin type piezoelectric vibrator) 6 is attached to one end of the long sound wave propagating body 5, and the piezoelectric vibrator 6 is connected to a high frequency power source. When the sound wave propagation body 5 is excited by
are each a movement that concentrates on the vibration node P.

However, in the configuration shown in FIG. 3, the driving force on the sound wave propagation book 5 is λ
Since the rotation is reversed every /4, the sound wave propagating body 5 as a conveyed object
The upper conveyed object 8 cannot be moved.

(Embodiment of the invention) Therefore, in the present invention, a non-contact portion of 1/4 wavelength determined by the excitation frequency of the ultrasonic wave and the speed of sound inside the sound wave propagation body, and a non-contact portion that contacts the conveyed object and transmits the driving force are provided. The problem explained in FIG. 3 is solved by alternately providing contact portions on the sound wave propagating body, and an example thereof is shown in FIG. 4.

In FIG. 4, a bolt-tight piezoelectric vibrator D (Denjuvin type piezoelectric vibrator) 6 is attached to one end of a long sound wave propagating body 5A, and the piezoelectric vibrator 6 is excited by a high-frequency power source 7. ing. Thereby, a standing wave due to longitudinal vibration is generated in the sound wave propagation body 5A. In this case, the driving force indicated by the arrow in the figure becomes a movement that concentrates on the vibration node P,
The direction of the driving force is reversed every λ/4. Therefore, in order to avoid transmitting a driving force in an unnecessary direction to the conveyed object 8, a non-contact portion 1o with a length of λ/4 and a conveyed object 8 (λ/
By alternately providing the contact portions 11 having a length of λ/4 and transmitting the driving force by contacting the total length of 4 or more) on the driving force transmission surface of the sound wave propagation body 5A, the conveyed object 8 is moved in the direction of the arrow Q. It can be transported in a fixed direction.

(Effects of the Invention) As explained above, according to the ultrasonic object conveyance method of the present invention, ultrasonic waves are radiated and propagated from one or both ends in the longitudinal direction of a rod-shaped or thick-shaped sound wave propagation body to the sound wave propagation body. In the case of transporting an object by moving the object, 1/
Since non-contact parts of four wavelengths and contact parts that contact the conveyed object and transmit driving force are alternately provided on the sound wave propagation body, the properties of standing waves generated on the sound wave propagation body can be utilized. The object to be transported can be transported in a fixed direction. Furthermore, since the longitudinal vibration mode of the sound wave propagation body can be utilized, it is possible to vibrate a very thick sound wave propagation body, and it is also possible to transport heavy objects.

[Brief explanation of the drawings] Figure 1 (A) is an explanatory diagram showing how a sound wave propagating body, which is an elastic body, undergoes deformation due to longitudinal vibration, and Figure 1 (B) is an explanatory diagram showing the stress distribution in that case. , FIG. 1(C) is an explanatory diagram showing the vibration distribution in that case, FIG. 2 is an explanatory diagram showing the movement of points on the sound wave propagating body, and FIG. 3 is a configuration for detailed explanation of the present invention. FIG. 4 is a configuration diagram showing an embodiment of the present invention. 5.5A...Sound wave propagation body, 6...Piezoelectric vibrator, 7.
...High frequency power supply, ...object to be transported. Takashi Murai, patent attorney and agent for patent applicant TDC Co., Ltd.

Claims (2)

[Claims] (1) In an ultrasonic object conveyance method in which an object is transferred by radiating ultrasonic waves from one or both ends in the longitudinal direction of a rod-shaped or plate-like sound propagation body, the excitation frequency of the ultrasonic waves is The sound wave propagating body is characterized in that non-contact portions having a wavelength of 1/4 determined by the speed of sound in the sound wave propagating body and contact portions that contact the conveyed object and transmitting a driving force are alternately provided on the sound wave propagating body. Ultrasonic object transport system. (2) The ultrasonic object transport method according to claim 1, wherein the object to be transported has a length of at least 1/4 wavelength or more.