JP3009206U - Piezoelectric drive type transport device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To clarify the shape and dimensions of the piezoelectric element and elastic plate that make up the vibrating body to maximize the characteristics and performance of the piezoelectric drive type carrier. thing. [Structure] In a piezoelectric drive type transport device, a piezoelectric element 21 has a thickness of 0.5 to 2.5 mm, and an elastic plate 22 has a thickness of 2.0 to 5.
When the thickness of the elastic plate 22 is 1 within a range of 5 mm, the width is 4 to 12, and the length is 10 to 25. When the thickness of the piezoelectric element 21 is 1, the width is 15-40,
A piezoelectric drive type transfer device in which the length is equalized by a ratio of 25 to 70 and the ratio of the width of the piezoelectric element 21 to the width of the elastic plate 22 is 0.7 to 1.0. [Effect] The first effect is to improve the transport speed and significantly reduce noise and vibration. The second effect is that the piezoelectric drive type carrier device having the same characteristics and performance can be provided with extremely high reproducibility.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piezoelectric drive type transfer device for transferring various parts such as electronic parts and mechanical parts by vibration.

[0002]

[Prior art]

 Many inventions and ideas have already been proposed for a piezoelectric drive type transfer device using a piezoelectric element as a drive source, and the structure and transfer principle will be described below with reference to FIG.

That is, a structure using two or more vibrating bodies 20 having a so-called bimorph structure in which piezoelectric elements 21 are attached to both surfaces of an elastic plate 22, and a structure in which one end of the vibrating body 20 is fixed to a base 23, The other end of the vibrating body 20 is fixed to the conveying body 25 via the connecting member 24. When an AC voltage is applied to each piezoelectric element 21 in the piezoelectric drive type transport device having the above-described structure, the component mounted on the transport body 25 is given a driving force by the transport principle described below.

The piezoelectric element 21 expands in a positive half cycle and contracts in a negative half cycle by the application of the AC voltage, and thus repeats a motion. Therefore, a vibrating body having a bimorph structure to which the piezoelectric element 21 is attached is formed. If the voltage applied to each piezoelectric element 21 in 20 is shifted by half a cycle, the expansion / contraction motion is converted into a flexion motion by the cantilever type bimorph structure, and the connecting portion between one end of the elastic plate 22 and the base 23 is used as a fulcrum. Then, the carrier 25 is vibrated in the direction of the arrow, and as a result, a unidirectional driving force is applied to the component placed on the carrier.

[0005]

[Problems of conventional technology]

 It is the vibrating body 20 that drives the conventional piezoelectric drive type transport device. From this point of view, the role of the vibrating body 20 is extremely important, and its characteristics and performance have a great influence on the conveying speed of the conveying parts and the noise and vibration generated from the piezoelectric drive type conveying device. Therefore, it is no exaggeration to say that the characteristics / performance of the piezoelectric drive type transport apparatus are determined by what kind of characteristics / performance the vibrating body 20 is set to in the piezoelectric drive type transport apparatus.

Despite the vibrating body 20 having such an extremely important role, the shape and dimensions of the piezoelectric element 21 and the elastic plate 22 forming the vibrating body 20 are not limited to the entire piezoelectric drive type conveying device. No precise pursuit has been made in relation to the characteristics and performance of. This means that there is a possibility that the characteristics and performance of the vibrating body 20 may not be sufficiently exhibited if turned over. The use of such an oscillating body is not only a problem in terms of the characteristics and performance of the piezoelectric drive type transfer device, but also in terms of power consumption and noise and vibration generated from the piezoelectric drive type transfer device.

[0007]

[Problems to be solved by the present invention]

 The present invention provides a novel piezoelectric drive type transfer device which solves the problems of the conventional piezoelectric drive type transfer device. That is, specifically, the shapes and dimensions of the piezoelectric element 21 and the elastic plate 22 forming the vibrating body 20 are precisely pursued in harmony with the characteristics and performance of the entire piezoelectric drive type conveying device, resulting in an extremely high conveying speed and a large conveying speed. An object of the present invention is to provide a piezoelectric drive type conveyance device with less noise and vibration in the width.

[0008]

[Means for Solving the Problems]

Hereinafter, means for solving the above problem will be described with reference to FIG. In the present invention, the shapes and dimensions of the piezoelectric element 21 and the elastic plate 22 constituting the vibrating body 20, which is a constituent element of the piezoelectric drive type conveying device, are made as follows. That is, when the thickness t ₁ of the piezoelectric element 21 is set to ₁ within the range of the thickness of the piezoelectric element of 0.5 to 2.5 mm and the thickness of the elastic plate of 2.0 to 5.5 mm, the width w ₁ is 15 to 40. , The length l ₁ is proportioned in the ratio of 25 to 70, and the width w ₂ is 4 to 12 and the length l ₂ is proportioned in the ratio of 10 to 25 when the thickness t ₂ of the elastic plate 22 is 1. The configuration is such that the ratio w ₁ / w ₂ of the width w ₁ of the piezoelectric element 21 and the width w ₂ of the elastic plate is 0.7 to 1.0.

In the present invention, lead zirconate titanate (hereinafter referred to as PZ T) is used as a functional ceramic that is one of solid displacement materials and is capable of directly converting electric energy into vibration energy. An appropriate piezoelectric material such as PZT to which a small amount of a third component such as antimony oxide is added is pressure-molded and fired to form a sintered body. After that, the thickness, width, and length are cut into the predetermined shape and size described above. Next, in order to impart piezoelectricity to the sintered body, a direct current voltage is applied in the thickness direction or the length direction and polarization treatment is performed to form a piezoelectric element.

The elastic plate 22 serving as a support for attaching the piezoelectric element 21 is made of a plate material having high elasticity and conductivity such as stainless steel, and the thickness, width and length thereof have the predetermined shapes and dimensions described above. Is processed as follows.

As described above, the piezoelectric element 21 and the elastic plate 22 which are formed in a predetermined shape and size are attached to the front and back surfaces of the elastic plate 22 by using an appropriate adhesive such as epoxy resin. The power supply line 26 is connected to the electrode provided on the surface of the element 21 to form the vibrating body 20 having the bimorph structure of the present invention.

[0012]

[Action]

 Next, the operation of the piezoelectric drive type transfer device using the vibrating body 20 will be described. When an AC voltage is applied to the piezoelectric element 21, one of the piezoelectric elements 21 attached to the elastic plate 22 expands and the other contracts, causing a bending displacement. However, the bending displacement changes in proportion to the applied voltage, and the bending displacement is reversed if the polarity of the applied voltage is reversed.

The bending displacement repeats positive and reverse rotations at a cycle corresponding to the frequency of the AC voltage applied to the piezoelectric element 21, and as a result, bending vibration is generated from the vibrating body 20. The bending vibration is transmitted to a connecting member fixed to a part of the vibrating body 20 and is converted into a bending motion, which causes the carrier to vibrate in an obliquely vertical direction.

The vibration of the carrier is generated by a vibration acceleration in a carrier component placed on the carrier as a combined vector of vibrations that are displaced in both the longitudinal direction or the circumferential direction of the carrier and the vertical direction. The conveyance is brought about by the combined action of inertial force and frictional force. This point will be explained in more detail. The transportation of transported parts utilizes the relative slip and jump phenomenon of the transported parts. That is, in order to make the frictional force asymmetrical, vibration is also generated in the normal direction of the carrier, and the magnitude of the normal force that acts on the carrier parts due to the vibration in the normal direction changes with time. The parts to be transported are apparently heavy or light. By the way, since the frictional force is the normal force of the carrier surface multiplied by the friction coefficient, by selecting the vibration direction and phase of the carrier appropriately, different frictional forces can be obtained in the forward and return paths of vibration. As a result, the transported parts are transported in only one direction.

Next, Table 1 shows a specific embodiment in which the present invention is applied to a bowl feeder. This embodiment is under the condition that a piezoelectric element made of the same material and an elastic plate made of the same material are used, and the width and the length are variously changed based on the thicknesses of the piezoelectric element 21 and the elastic plate 22 and the piezoelectric element is used. This is when the ratio of the width of the elastic plate 22 and the width of the elastic plate 22 are variously changed to maximize the characteristics and performance of the entire piezoelectric drive type conveying device.

[Table 1]

[0016]

[Effect of the present invention]

 The first effect of the present invention is to clarify the shape and size of the piezoelectric element and the elastic plate that maximize the characteristics and performance of the piezoelectric drive type transfer device for each size of the transfer body, and thereby the piezoelectric drive type transfer device. This is to significantly improve and improve the conveyance speed and noise / vibration, which are the main characteristics and performance of the. Specifically, the transport speed is increased by 20% and reaches 100 mm / see, and noise and vibration can be reduced by 15%.

The second effect of the present invention is that the piezoelectric element and elastic plate capable of maximizing the characteristics and performance of the piezoelectric drive type conveying device can be grasped and the shape and dimensions of the elastic plate can be grasped, so that the piezoelectric element having the same characteristics and performance can be obtained. That is, it is possible to provide the drive-type transfer device with extremely high reproducibility.

[Brief description of drawings]

FIG. 1 is a side sectional view of a vibrating body used in a piezoelectric drive type transport device of the present invention.

FIG. 2 is a front view of a conventional piezoelectric drive type transport device.

[Explanation of symbols]

 20. Exciter 21. Piezoelectric element 22. Elastic plate 23. Base 24. Connecting member 25. Carrier 26. Power supply line

Claims (1)

[Scope of utility model registration request] 1. A piezoelectric drive type transporting apparatus using a vibrating body having a bimorph structure in which a piezoelectric element is attached to one or both sides of an elastic plate. The thickness t of the elastic plate is within the range of 2.0 to 5.5 mm.
₂ = 1 and the time width _w 2 = 4 to 12, the length _l 2 =. 10 to
25, and the piezoelectric element thickness t ₁ = 1
Width w ₁ = 15-40, length l ₁ = 25-70
Of the piezoelectric element and the width w _{1 of the} piezoelectric element and the width w ₂ of the elastic plate are set to be w ₁ / w ₂ = 0.7 to 1.0. apparatus.