JPH0344964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibrating machine, for example a vibrating parts feeder.

[Conventional technology and its problems]

Recently, a vibrating parts feeder as shown in FIG. 5 has been developed. In other words, the driving method is unique, but in the figure, ball 1 and base 2
is a plurality of inclined first planes arranged at equal angular intervals.
They are connected by an elastic plate 4 and a second elastic plate 6, and each first elastic plate 4 has piezoelectric elements 5a on both sides.
5b is attached. The base 2 is supported on the floor by anti-vibration rubber 3.

When AC voltage V is applied to the piezoelectric elements 5a and 5b, bending vibration is generated in the first elastic plate 4, which is transmitted to the ball 1 via the second elastic plate 6, and the ball 1 performs torsional vibration or rotational vibration. . The second elastic plate 6 has a sufficiently smaller spring constant than the first elastic plate 4, and serves to prevent large torsion from occurring in the piezoelectric element attached to the first elastic plate 4 and to increase the swing width of the ball 1. However, the presence of this member 6 increases the height H of the entire vibrating parts feeder.

In modern factory equipment, various devices are arranged around the vibrating parts feeder, and it is desirable that the height H of the vibrating parts feeder is as small as possible in view of the arrangement with these devices.

Further, if the size of the ball 1 changes, a piezoelectric element with a large capacity must be used to generate the necessary driving force, but the disassembly and assembly work for this is troublesome.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a vibrator which can reduce the height of the entire vibrator and whose vibration generating section can be made into a unit.

[Means for solving problems]

The above purpose is to fix the movable part to the upper end of the leaf spring, attach the lower end of the leaf spring to a piezoelectric element mounting member that is sufficiently smaller than the length of the leaf spring, and connect the piezoelectric element mounting member and the movable part to the piezoelectric element mounting member, which is sufficiently smaller than the length of the leaf spring. An alternating current voltage is applied to a piezoelectric element interposed between the piezoelectric element and a base disposed below, and the resonant frequency determined by the mass of the movable part and the spring constant of the leaf spring is set to the frequency of the alternating voltage. The vibration reaction force is applied to the upper end of the leaf spring by applying the vibration force due to the expansion and contraction of the piezoelectric element due to the application of the alternating current voltage to the lower end of the leaf spring via the piezoelectric element mounting member. This is achieved by a vibrator characterized in that the movable part is vibrated.

[Effect]

When an alternating voltage is applied to a piezoelectric element, it expands and contracts. The leaf spring receives the vibration force caused by this expansion and contraction at one end and performs a bending motion. A movable part fixed to the other end of the leaf spring vibrates in the bending direction of the leaf spring.

There is no need for an auxiliary leaf spring like in the past, and the piezoelectric element can be placed at the other end of the leaf spring with almost no height required, reducing the overall height of the vibrator. can do.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibrator according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

1 and 2 show a vibrating parts feeder according to a first embodiment of the present invention, in which a ball 1 is coupled to a base 13 via a plurality of leaf springs 15 and laminated piezoelectric elements 19, 20, 21. There is.

As clearly shown in FIG. 2, the leaf springs 15 are arranged at equal angular intervals and inclined at a predetermined angle, and their upper ends are fixed to a mounting block 12 integral with the bottom of the ball 1 by bolts 17. As shown in FIG. 2, each leaf spring 15 is attached to the peripheral wall of the base 13.
A slope 13a is formed correspondingly. This angle of inclination is equal to the angle of inclination of the leaf spring 15. Three rectangular plate-shaped piezoelectric elements 19, 2 are mounted on these slopes 13a.
0 and 21 are pasted. Although not shown, electrode layers are formed on both surfaces of these, and these are connected to an AC power source V through wiring as shown.

The laminated piezoelectric elements 19, 20, 21 are fixed to the lower end of the leaf spring 15 via a mounting block 16 with bolts 18. The entire vibrating machine is supported on the floor by vibration isolating rubber 14.

The resonant frequency of this vibration system determined by the spring constant of the leaf spring 15 and the mass of the ball 1 (strictly speaking, the mass of the ball 1 and the base 13) is approximately equal to the frequency of the AC power supply V.

The first embodiment of the present invention is configured as described above, and its operation, effects, etc. will be explained next.

When an AC voltage is applied to the piezoelectric elements 19, 20, 21 from the AC power source V, these piezoelectric elements 19, 2
0 and 21 expand and contract in the longitudinal direction and thickness direction, causing the lower end of the leaf spring 15 to vibrate in the direction shown by arrow a. As a result, the upper end of the leaf spring 15 torsionally vibrates in the direction indicated by the arrow b as shown in the ball 1. Although arrows a and b are in the same direction, ball 1 has a much larger amplitude due to resonance. Although not shown, the parts within the ball 1 are transported along a spiral track by vibration.

In this embodiment, an auxiliary leaf spring 6 as in the conventional example is used.
Since it is unnecessary, piezoelectric element 1 for driving
9, 20, and 21 can be arranged within the range of the height of the base 13 or in the area between the ball 1 and the base 13 as shown in the figure, so the height H' of the entire vibrating parts feeder is smaller than before. Can be made smaller.

Also, when changing the leaf spring 15 to adjust the resonance frequency by changing the ball 1, simply bolt 1.
It is much simpler than the conventional method because it is only necessary to attach and detach parts 7 and 18. The piezoelectric elements 19, 20, 21 can remain attached to the base 13.
In other words, the vibrating section can be made into a unit.

FIG. 3 shows a linear vibration feeder according to a second embodiment of the present invention. In the figure, a block 22 fixed to the bottom of a linear trough 41 has a pair of front and rear inclined leaf springs 25, 25 at the upper ends. is fixed by a bolt 26, and the lower end is fixed to a piezoelectric element mounting block 28 by a bolt 27. Between the mounting block 28 and the piezoelectric element mounting portion 24, there are rectangular plate-shaped laminated piezoelectric elements 29, 30, 31, 2.
9', 30', and 31' are held in place. The piezoelectric element mounting portion 24 is integral with the base 23, and the base 23 is supported on the floor by a vibration isolating rubber 32. Although not shown, electrode layers are formed on both sides of the piezoelectric element, and these are connected to an AC power source V through wiring as shown. However, the piezoelectric elements 29, 30, 31, 29', which are held between the left and right sides of the mounting part 24,
The expansion and contraction directions of 30' and 31' are polarized in opposite directions as shown by the arrows. represents expansion, and represents contraction.

The resonance frequency of this vibration system, which is determined by the spring constant of the leaf spring 25 and the mass of the trough 41 (strictly speaking, the mass of the trough 41 and the base 23), is determined by the AC power supply V.
is approximately equal to the frequency of

The second embodiment of the present invention is configured as described above, and its operation, effects, etc. will be explained next.

Piezoelectric elements 29, 30, 31, 29', 30', 3
When an AC voltage is applied to 1' from an AC power supply V, these piezoelectric elements expand and contract in the longitudinal direction and thickness direction (however, 29, 30, 31 and 29', 30', 3
The lower end of the leaf spring 25 (expansion and contraction is opposite to 1')
Vibrate in the direction shown. This causes the leaf spring 25
The upper end of the trough 41 vibrates in the direction indicated by arrow b, as shown in the trough 41. Although arrows a and b are in the same direction, the amplitude of the trough 41 is much larger due to resonance. Although not shown, the material or parts within the trough 41 are vibrated to the left along the linear trough.

In this embodiment, the auxiliary plate spring 6 is used as in the conventional example.
Since the drive piezoelectric element can be disposed within the height range of the base 23 as shown in the figure or in the area between the trough 41 and the base 23, the entire vibration feeder height of
H′ can be made smaller than before. The effect when replacing the trough 41 is the same as in the first embodiment.

FIG. 4 shows a linear vibration feeder according to a third embodiment of the present invention. In the figure, a block 43 fixed to the bottom of a linear trough 51 has a pair of front and rear inclined leaf springs 44, 44 at the upper ends. is fixed by a bolt 45, and the lower end is fixed to a piezoelectric element mounting block 47 by a bolt 46. Mounting block 47 and piezoelectric element mounting parts 43a, 43b
There are rectangular plate-shaped laminated piezoelectric elements 48, 4 between
9, 50, 48', 49', and 50' are held in place. The piezoelectric element mounting parts 43a and 43b are attached to the base 42.
The base 42 is supported on the floor by a vibration isolating rubber 32. Although not shown, electrode layers are formed on both sides of the piezoelectric element, and these are connected to an AC power source V through wiring as shown. However, the polarity is set to be the same as the direction of expansion and contraction of the piezoelectric elements 48, 49, 50, 48', 49', and 50' attached to the attachment parts 43a and 43b, as shown by the arrows. represents expansion, and represents contraction.

The resonant frequency of this vibration system, which is determined by the spring constant of the leaf spring 44 and the mass of the trough 51 (strictly speaking, the mass of the trough 51 and the base 42), is determined by the AC power supply V.
is approximately equal to the frequency of

The third embodiment of the present invention is configured as described above, and its operation, effects, etc. will be explained next.

Piezoelectric elements 48, 49, 50, 48', 49', 5
When an AC voltage is applied from an AC power source V to 0', these piezoelectric elements expand and contract in the longitudinal direction and thickness direction.
The lower end of the leaf spring 44 is vibrated in the direction shown by arrow a. As a result, the upper end of the leaf spring 44 is placed in the trough 5.
1, it vibrates in the direction shown by arrow b.
Arrows a and b are in the same direction, but the swing width is in the trough 41
is much larger due to resonance.

Other functions and effects are the same as those in the first embodiment or the second embodiment.

Although each embodiment of the present invention has been described above,
Of course, the present invention is not limited to these, and various modifications can be made to the technical idea of the present invention.

For example, in the embodiments described above, a plurality of piezoelectric elements for vibration driving are laminated, but it is also possible to use a single piezoelectric element. However, it is preferable to laminate a plurality of layers from the viewpoint of the electric field strength within the element material and the amplitude that can be obtained.

Further, in the above embodiments, a parts feeder and a linear feeder have been described as vibrators, but the present invention is not limited to these and can be applied to other vibrators, such as vibrating screens and vibrating spiral elevators.

〔Effect of the invention〕

As described above, according to the vibrator of the present invention, the overall height can be made smaller than that of the conventional vibrator, and the vibrating drive section can be made into a unit.

[Brief explanation of drawings]

FIG. 1 is a side view of a parts feeder according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view along the - line in FIG. 1, and FIG. 3 is a side view of a linear vibration feeder according to a second embodiment of the present invention. FIG. 4 is a side view of a linear vibration feeder according to a third embodiment of the present invention;
and FIG. 5 is a side view of a conventional vibrating parts feeder. In the figure, 1...ball, 13, 23,
42... Base, 15, 25, 44... Leaf spring,
19, 20, 21, 29, 30, 31, 29',
30', 31', 48, 49, 50, 48', 4
9', 50'... piezoelectric element, 41, 51... trough.

Claims (1)

[Claims] 1. A movable part is fixed to the upper end of a leaf spring, the lower end of the leaf spring is attached to a piezoelectric element mounting member that is sufficiently smaller than the length of the leaf spring, and the piezoelectric mounting member and the An alternating current voltage is applied to a piezoelectric element interposed between a base disposed below the movable part, and a resonant frequency determined by the mass of the movable part and the spring constant of the leaf spring is determined by the alternating voltage. vibration applied to the upper end of the leaf spring by applying vibration force due to expansion and contraction of the piezoelectric element by applying the AC voltage to the lower end of the leaf spring via the piezoelectric element mounting member. A vibrating machine characterized in that the movable part is vibrated by a reaction force. 2 The piezoelectric element is a first piezoelectric element consisting of a laminated piezoelectric element part.
The vibrator described in section.