JP2007161454A - Rotational vibration machine and vibratory carrying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotational vibration machine capable of improving vibration efficiency, and capable of constituting a device compact in size. <P>SOLUTION: This rotational vibration machine 10 has a driving body 13 constituted so that displacement in the rotational direction is allowed between an inner end and an outer end and extending in the radial direction, an upward extending vertical elastic member 14 having a lower end installed on the outer end of the driving body, a support 12 installed on the inner end of the driving body, and a vibrator installed on the upper end of the vertical elastic member, and is characterized in that the vertical elastic member has an opening penetrating in the radial direction, and has respectively integrally side edges on both sides in the rotational direction of the opening. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary vibrator and a vibratory transfer device, and more particularly to a structure of a rotary vibrator suitable for use as a vibration source of a bowl-type vibratory transfer device.

  In general, in order to transport small parts such as electronic parts, various vibration-type transport apparatuses are used in factories. In recent years, this type of vibratory transfer device is required to have a high supply speed and supply accuracy, and an increase in speed and performance is urgently required. As the vibratory transfer device, there is a bowl-type vibratory transfer device provided with a spiral track. The bowl-type vibratory transfer device includes a rotary vibrator that generates rotational vibration or torsional vibration, and an upper part of the rotary vibrator. And a bowl-type transport body having the spiral track described above.

  Conventional rotary vibrators include an electromagnetic drive source, a drive plate that vibrates up and down by the electromagnetic drive source, and an upper diaphragm connected to the drive plate via a spring. ing. The above-mentioned springs are attached to a plurality of positions at equiangular intervals on the peripheral edge between the drive plate and the upper diaphragm in an inclined posture, and the upper diaphragm is obliquely upward as the drive plate vibrates up and down. It is configured to vibrate toward torsion.

In addition, some rotary vibrators use a piezoelectric actuator using a piezoelectric element instead of the electromagnetic drive source. Generally, a piezoelectric actuator and a leaf spring in an oblique posture are used with a base and an upper diaphragm. It connects with the composite elastic body formed by connecting. Furthermore, by improving this composite elastic body, the piezoelectric actuator is arranged so as to extend horizontally in the radial direction, and a leaf spring installed so as to extend in the obliquely vertical direction is connected to the outer end of the composite elastic body. It is known to reduce the height of the machine (see, for example, Patent Document 1 below).
JP-A-62-201710

  By the way, in the rotary vibrator having the drive plate that vibrates up and down by the electromagnetic drive source as described above, the vibration component in the rotational direction is obtained from the vertical vibration of the drive plate by the slanting spring. If the angle is large, a stroke in the rotational direction cannot be obtained. Therefore, it is necessary to reduce the tilt angle for the purpose of increasing the conveyance speed. However, if the inclination angle is too small, the generation efficiency of vibration is lowered and the load applied to the spring is increased, so that power consumption is increased in order to secure vibration energy, and durability due to breakage of the spring or the like is increased. There is a problem of causing a decrease.

  On the other hand, in the rotary vibrator using the above-described piezoelectric actuator, a leaf spring is connected to the piezoelectric actuator, so that the spring constant of the leaf spring can be efficiently vibrated even if the vibration becomes high frequency. Should be increased. However, if the spring constant of the plate spring is too large, there is a risk that large distortion will occur in the piezoelectric actuator, and it will be difficult to amplify the vibration of the piezoelectric actuator and efficiently transmit it to the upper diaphragm. In addition, there is an advantage that the height of the rotary vibrator can be reduced by setting the piezoelectric actuator in a horizontal posture, but in this case, the leaf spring has a width in the radial direction, which causes deformation of the piezoelectric actuator. There is a problem that a difference in amplitude occurs between the inner edge and the outer edge of the leaf spring, causing torsional deformation of the leaf spring, which may reduce the vibration efficiency as a whole.

  Therefore, the present invention solves the above-mentioned problems, and its object is to provide a rotary vibrator capable of improving durability while ensuring vibration efficiency and capable of configuring the apparatus compactly. .

  In view of such circumstances, the rotary vibrator of the present invention has a radially extending driver configured to be able to form a rotational displacement between an inner end and an outer end, and a lower end at the outer end of the driver. A longitudinal elastic member attached and extending upward; a support attached to an inner end of the driving body; and a vibration body attached to an upper end of the longitudinal elastic member, wherein the longitudinal elastic member is arranged in a radial direction. An opening is provided, and side edges are integrally formed on both sides in the rotational direction of the opening.

  According to the present invention, the driving body is configured to extend in the radial direction, and a displacement in the rotational direction can be generated between the inner end and the outer end thereof, thereby ensuring a bending range of the driving body in the radial direction. Therefore, sufficient vibration displacement of the vibrating body can be obtained without causing an increase in the size of the rotary vibrator, and the vibrating body can be vibrated efficiently in the rotational direction. In addition, the longitudinal elastic member connected between the outer end of the driving body and the vibrating body has an opening that penetrates in the radial direction. A sufficient amount of elastic deformation can be ensured in the direction, and a large spring constant can be obtained even if the longitudinal elastic member is made compact in the radial direction, so that torsional deformation is suppressed and vibration efficiency is ensured. And the durability of the longitudinal elastic member can be improved.

  In the present invention, it is preferable that the thickness of the longitudinal elastic member in the radial direction is equal to or less than the thickness in the rotational direction. According to this, since the thickness in the radial direction can be reduced while securing the spring constant and durability of the longitudinal elastic member, the displacement in the rotational direction of the driving body is smaller than that of a conventional leaf spring having a wide width in the radial direction. Since the occurrence of torsional deformation of the longitudinal elastic member due to the difference in the radial direction can be significantly suppressed, vibration can be transmitted to the vibrating body more efficiently.

  In this invention, it is preferable that the thickness of the said side edge part in the rotation direction is smaller than the thickness of a radial direction. According to this, since it becomes easier to ensure the amount of elastic deformation in the rotational direction of the longitudinal elastic member, it is easy to amplify the vibration displacement of the driving body and transmit it to the vibrating body.

  In the present invention, the driving body is preferably a piezoelectric actuator in which a piezoelectric element is attached to a lateral elastic member extending in a horizontal direction. According to this, it is possible to efficiently generate vibration by driving the lateral elastic member by the bending deformation of the piezoelectric element, and it is easy to increase the frequency of vibration, so that it corresponds to the conveyance of minute parts. Is possible.

  In the present invention, the driving body includes a plate-like transverse elastic member, and the plate surface of the transverse elastic member and the extending direction of the longitudinal elastic member are both inclined with respect to the vertical direction and are configured to be parallel to each other. It is preferable. According to this, since the vibration energy of the drive body is efficiently transmitted to the vibration body via the longitudinal elastic member, vibration can be generated more efficiently.

  Next, the vibratory conveying device of the present invention is a spiral track on the inner surface, which is configured integrally with the rotary vibrator according to any one of the above, or configured separately and fixed. It has the conveyance body which has. According to this invention, it becomes possible to convey a workpiece | work at high speed along a spiral track by the rotational vibration or torsional vibration of a conveyance body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a schematic partial perspective view showing the internal structure of the rotary vibrator according to the present embodiment with the upper part (vibrating body) omitted, FIG. 2 is a schematic longitudinal sectional view of the same embodiment, and FIG. 3 is a plan view of the same embodiment. 4 is a front view of the embodiment, FIG. 5 is a perspective view of the embodiment, FIG. 6 is a partial front view showing the upper structure of the embodiment, and FIG. 7 is a partial perspective view showing the upper structure of the embodiment. It is.

  The rotary vibrator 10 of the present embodiment includes a base 11, a support 12 fixedly disposed at the center of the base 11, a driver 13 having an inner end fixed to the support 12, A longitudinal elastic member 14 whose lower end is fixed to the outer end of the driving body 13 and a vibrating body 15 fixed to the upper end of the longitudinal elastic member 14 are provided.

  The base 11 has a sufficient weight so that the upper vibrating body 15 and the vibration target connected thereto can be vibrated efficiently. The support 12 fixed to the inside of the base 11 has a plurality of support portions 12a projecting in the radial direction to fix the inner ends of the plurality of drive bodies 13, respectively. The driving body 13 is fixed with a bolt or the like. In the case of the illustrated example, the support 12 has four support portions 12a for attaching the four drive bodies 13, and the cross section thereof is configured in a substantially cross shape. The respective support portions 12a are provided so as to be equiangularly spaced around the central axis, whereby a plurality of driving bodies 13 are arranged around the support 12 at regular angular intervals.

  Even when a plurality of driving bodies 13 can be arranged around the central axis as described above, at least one of them is used as the driving body 13 and the other is used by being replaced with an elastic member such as a leaf spring. May be. As this elastic member, for example, a lateral elastic member 131 described later can be used.

  The drive body 13 is formed in a rectangular plate shape as a whole, and extends in a substantially horizontal posture in the radial direction from the inner end fixed to the support body 12 to the outer end. FIG. 10 is a schematic plan view (a) and a schematic front view (b) showing the structure of the driving body 13. As shown in FIG. 10, the driving body 13 includes a plate-like lateral elastic member 131 made of an elastic material such as a metal spring material, and a piezoelectric element 130 </ b> P attached to the surface of the lateral elastic member 131. It has. The piezoelectric element 130P is configured such that a predetermined voltage is applied in the thickness direction, and the piezoelectric element 130P is bent by applying the voltage, and thus the lateral elastic member 131 can be bent. The

  The piezoelectric element 130 </ b> P may be attached to at least one surface of the lateral elastic member 131, but in the present embodiment, the driving body 13 has the piezoelectric elements 130 </ b> P disposed on both sides of the lateral elastic member 131. ing. The lateral elastic member 131 can be bent quickly and efficiently by applying a voltage in such a manner that the piezoelectric elements 130P on both sides bend in the same direction.

  The drive body 13 of this embodiment is configured to generate flexural vibrations by periodically driving the piezoelectric element 130P with a drive signal such as a sine wave or a rectangular wave. This flexural vibration can be set to an appropriate frequency by a drive signal supplied to the piezoelectric element 130P. However, in practice, the frequency of the drive signal is substantially equal to the resonance frequency of the vibration system of the rotary vibrator 10 (a system including the carrier when the carrier described later is mounted on the vibrator 15). Adjusted to match.

  In addition, fixing holes 131a are provided at both ends of the lateral elastic member 131, and can be directly or indirectly fixed to the support 12 or the longitudinal elastic member 14 with bolts or the like. Note that the fixing hole 131a may be a slit, a notch, or the like.

  The outer end of the driving body 13 is fixed to the connecting member 16 with a bolt or the like, and the connecting member 16 is fixed to the lower end of the longitudinal elastic member 14. The connecting member 16 is disposed so as to overlap the outer end of the driving body 13 in a plan view. Further, the connecting member 16 has a thickness equal to or greater than the width of the lower end of the longitudinal elastic member 14, and the outer surface of the connecting member 16 is directly or indirectly with the entire lower end of the longitudinal elastic member 14 (for example, via a washer). It is in close contact.

  In addition, the outer periphery of the base 11 is provided with a recess 11a, and a notch 11b that opens upward is formed at the center of the recess 11a. The longitudinal elastic member 14 is exposed to the outside through the notch 11b. In the case of the illustrated example, the longitudinal elastic member 14 is in a state of being disposed inside the notch portion 11b. Accordingly, the longitudinal elastic member 14 can be visually recognized from the outside, and maintenance of the longitudinal elastic member 14 is facilitated.

  FIG. 8 is an enlarged partial view showing an enlarged view of the vicinity of the attachment portion of the longitudinal elastic member 14 from the outside in the radial direction, and FIG. 9 is an enlarged view showing an enlarged view of the vicinity of the attachment portion viewed from the rotation direction. FIG. The longitudinal elastic member 14 has a shape extending substantially in the vertical direction, and its lower end 14 a is fixed to the outer end of the driving body 13 via the connecting member 16, and its upper end 14 b is fixed to the vibrating body 15. Has been. The longitudinal elastic member 14 is attached in a posture slightly inclined with respect to the vertical direction.

  The inclination angle θ of the longitudinal elastic member 14 depends on the vibration characteristics required for the rotary vibrator, but is preferably in the range of 5 to 15 degrees with respect to the vertical plane, and particularly in the range of 7 to 10 degrees. It is desirable that When the inclination angle θ exceeds the above range, the conveyance efficiency is lowered when used in a vibration type conveyance device described later, and flickering of the object (parts) to be conveyed is likely to occur. Moreover, when the inclination angle θ is less than the above range, the conveyance efficiency of the object to be conveyed decreases. The inclination angle θ is set to be smaller than that of a conventional electromagnetically driven rotary vibrator that generates a vibration component in the rotational direction from vertical vibration. This is because in the case of the present embodiment, the driving body 13 and the longitudinal elastic member 14 are driven in the direction in which the vibrating body 15 is desired to vibrate.

  Further, the driving body 13 is also inclined with respect to the vertical plane at the same inclination angle θ as that of the longitudinal elastic member 14. In the illustrated example, the plate surface of the transverse elastic member 131 is inclined at the inclination angle θ, whereby the bending direction of the driving body 13 and the extending direction of the longitudinal elastic member 14 are orthogonal to each other. In the case of the present embodiment, the inclination angle θ is an angle that substantially matches the vibration direction of the vibrating body 15.

  An opening 14c penetrating in the radial direction is formed in an intermediate portion of the longitudinal elastic member 14, and side edge portions 14d and 14e are integrally provided on both sides of the opening 14c. In the case of the illustrated example, the opening 14c has a long hole shape extending in the extending direction of the longitudinal elastic member 14, whereby the side edge portions 14d and 14e are rectangular sections having equal width portions in the extending direction. It has become. The portions of the side edge portions 14d and 14e have a length in the extending direction that is sufficiently longer (three times or more) than the widths Td and Te in the rotation direction.

  In the present embodiment, the thickness Tr (see FIG. 9) in the radial direction of the longitudinal elastic member 14 is equal to or less than the thickness Tc (see FIG. 8) in the rotation direction. In this way, since the thickness Tr in the radial direction of the longitudinal elastic member can be reduced, the occurrence of torsional deformation can be suppressed as will be described later. Generally, Tr does not have to be equal to or less than Tc. However, it is preferable that the ratio of Tr and Tc is a value close to 1 to some extent in order to increase the durability (mechanical strength) of the longitudinal elastic member 14. Further, considering the existence of the opening 14c, the ratio of Tr and Tc is preferably in the range of 0.3 to 1.5, and particularly preferably in the range of 0.5 to 0.9. .

  Further, the thicknesses Td and Te in the rotation direction of the side edge portions 14d and 14e are respectively configured to be smaller than the thickness Tr in the radial direction. As a result, even if Tc is set to be relatively large as described above, the amount of elastic deformation in the rotational direction of the longitudinal elastic member 14 is ensured, so that the flexural vibration of the driving body 13 can be amplified and transmitted to the vibrating body 15 easily. Become.

  An upper end 14 b of the longitudinal elastic member 14 is attached and fixed to the outer peripheral surface of the vibrating body 15. The vibrating body 15 is configured in a substantially disk shape as a whole, and a flat portion 15a is provided on a portion of the outer peripheral surface where the longitudinal elastic member 14 is fixedly attached.

  In the present embodiment described above, when a driving signal is supplied to the piezoelectric element 130P, a bending vibration in the rotational direction is generated in the driving body 13, and this bending vibration is transmitted to the vibrating body 15 via the longitudinal elastic member 14. Therefore, the vibrating body 15 vibrates in the rotation direction. At this time, since the longitudinal elastic member 14 is inclined as described above, the vibration direction of the vibrating body 15 is precisely a direction slightly inclined with respect to the rotation direction, and so-called torsional vibration is generated. .

  In the present embodiment, since the driving body 13 is arranged to extend in the radial direction, the displacement of the bending vibration of the driving body 13 can be sufficiently ensured while suppressing the height of the rotary vibrator 10. . And when it applies to the vibration-type conveying apparatus mentioned later, it has been confirmed by experiment that it becomes possible to convey a to-be-conveyed object faster than before. Further, the driven body 13 is displaced in the rotation direction (in reality, the direction inclined by the above-mentioned inclination angle θ with respect to the rotation direction). There is also an advantage that it becomes difficult to occur.

  In particular, the longitudinal elastic member 14 fixed to the outer end of the driving body 13 has an opening 14c penetrating in the radial direction and is integrally provided with side edge portions 14d and 14e on both sides thereof, thus ensuring durability. In addition to being able to obtain sufficient springiness. That is, it is easy to achieve both the setting of the spring constant of the longitudinal elastic member 14 and the securing of durability.

  In addition, since the radial thickness Tr can be reduced, and particularly the radial thickness Tr is configured to be equal to or less than the rotational thickness Tc, the longitudinal elastic member 14 is bent by the bending of the driving body 13 along the radial direction. Since twist deformation is less likely to occur and vibration modes other than the original vibration mode in the rotational direction are less likely to occur, the efficiency of vibration transmission via the longitudinal elastic member 14 can be increased.

  In particular, since the opening shape of the opening 14c is a long hole extending in the extending direction of the longitudinal elastic member 14, a sufficient amount of elastic deformation is ensured, and the elastic displacement of the driving body 13 is amplified to vibrate the vibrating body. 15 can be communicated. However, the opening shape of the opening 14c should be determined in consideration of the spring constant and other vibration transmission characteristics and durability required for the rotary vibrator, and is limited to the long hole shape as described above. is not.

  11 and 12 are plan views of the component supply system 100 including the vibration transfer device 110 using the rotary vibrator 10 and another vibration transfer device 120 connected to the vibration transfer device 110. FIG. In this system 100, the above-described vibration transfer device 110 is a bowl-type transfer device including a spiral track, and the vibration transfer device 120 is a linear transfer device including a linear track. .

  A support base 102 is preferably supported on the installation base 101 via vibration isolation means (rubber or spring). A base 11 is disposed on the support base 102, and the rotary vibrator 10 is installed. On the rotary vibrator 10, a transport body 111 fixed to the vibrator 15 is disposed. The transport body 111 is formed in a bowl shape as a whole, and a spiral track 111x is formed on the inner surface thereof. The track 111x gradually rises from the inner bottom portion of the transport body 111 and reaches the outer peripheral portion. A part selection unit 113 is provided in a portion where the track 111 x is provided on the outer periphery of the transport body 111. The parts selection unit 113 includes a sensor (for example, an optical sensor) that detects the posture and shape of a part (work) (not shown) conveyed on the track 111x, and places the part on the track 111x according to a detection signal of the sensor. And an exclusion mechanism (for example, a mechanism that blows off parts by blowing air).

  On the other hand, the vibratory transfer device 120 includes a base 121 installed on the support base 102, a vibrator 122 configured on the base 121, and a carrier 123 that vibrates by the vibrator 122. Is provided. A linear track 123 x is formed on the transport body 123. The track 123x has an upstream end disposed opposite to the downstream end of the track 111x, and parts sent on the track 111x are transferred to the track 123x as they are and conveyed.

  In this system 100, the conveyance speed of the conveyance body 111 that is vibrated by the rotary vibrator 10 can be set high. The conveyance speed of this embodiment can obtain a conveyance speed of 1.8 to 2 times as compared with the case of using a conventional electromagnetically driven rotary vibrator. In general, it is difficult to increase the conveying speed in the vibration type conveying apparatus provided with a spiral track, but in this embodiment, the speed can be increased by using the rotary vibrator 10 described above, so that the component supply speed of the entire system 100 is increased. be able to. Further, since the rotary vibrator 10 can be easily made compact, the entire system 100 can be configured compactly.

  Note that the vibratory conveyance device of the present invention is not limited to the above-described illustrated examples, and it is needless to say that various changes can be made without departing from the gist of the present invention. For example, in the above-described embodiment, a bowl-type vibration-type transfer device having a spiral track on the inner surface is configured, but various transfer devices that require rotational vibration and torsional vibration, for example, the outer surface of the transfer body You may comprise the conveying apparatus which has a spiral track on it.

FIG. 3 is a partially omitted perspective view of the rotary vibrator according to the embodiment. The longitudinal cross-sectional view of the rotary vibrator of embodiment. The top view of the rotary vibrator of embodiment. The front view of the rotary vibrator of embodiment. The perspective view of the rotary vibrator of embodiment. The front view which shows the upper structure of the rotary vibrator of embodiment. The perspective view which shows the upper structure of the rotary vibrator of embodiment. The expanded partial view which expands and shows the vicinity of the longitudinal elastic member of the rotary vibrator of embodiment. The enlarged partial view which looked at the vicinity of the longitudinal elastic member of the rotary vibrator of embodiment from the direction orthogonal to FIG. The top view (a) and front view (b) which show the structure of the drive body of embodiment. The top view of the component supply system containing the vibration type conveying apparatus of embodiment. The front view of the system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rotary vibrator, 11 ... Base, 12 ... Support body, 13 ... Drive body, 130P ... Piezoelectric element, 131 ... Lateral elastic member, 14 ... Longitudinal elastic member, 14c ... Opening, 14d, 14e ... Side edge part, DESCRIPTION OF SYMBOLS 15 ... Vibrating body, 16 ... Connection member, 100 ... Component supply system, 110, 120 ... Vibratory conveyance apparatus, 111 ... Conveyance body, 111x ... Track

Claims (6)

A radially extending driver configured to generate a rotational displacement between an inner end and an outer end;
A longitudinal elastic member having a lower end attached to the outer end of the driving body and extending upward;
A support attached to the inner end of the driver,
A vibrating body attached to the upper end of the longitudinal elastic member;
Comprising
The longitudinal elastic member includes an opening penetrating in a radial direction, and integrally has side edges on both sides in the rotation direction of the opening.   The rotary vibrator according to claim 1, wherein a thickness of the longitudinal elastic member in a radial direction is equal to or less than a thickness in a rotation direction.   3. The rotary vibrator according to claim 1, wherein a thickness in a rotation direction of the side edge portion is smaller than a thickness in a radial direction.   The rotary vibrator according to any one of claims 1 to 3, wherein the driving body is a piezoelectric actuator in which a piezoelectric element is attached to a lateral elastic member extending in a horizontal direction.   The driving body includes a plate-like transverse elastic member, and the plate surface of the transverse elastic member and the extending direction of the longitudinal elastic member are both inclined with respect to the vertical direction and are configured to be parallel to each other. The rotary vibrator according to any one of claims 1 to 4. A rotary vibrator according to any one of claims 1 to 5, and a conveying body having a spiral track on an inner surface, which is configured integrally with the vibrating body or is configured separately and fixed. A vibratory conveying device comprising:

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