JP2953054B2 - Measuring method of vibration angle - Google Patents

Description

The present invention relates to a method for measuring a vibration angle of a trough of a vibration feeder, for example.

[Conventional technology and its problems]

FIG. 4 schematically shows a vibration feeder. This is an electromagnetic vibration feeder, which is generally designated as (4) and has a trough (5) with a U-shaped cross section, which is suspended by a coil spring (7) on a part (8) of the building. I have. The electromagnetic vibration feeder (4) has a vibration drive unit (6) made of a known electromagnet, and the trough (5) performs linear vibration in a predetermined vibration direction as shown by an arrow a by this drive. However, there are cases where it is desired to measure this vibration angle. That is, although the trough (5) is suspended in the horizontal direction in FIG. 4, there is a case where it is desired to measure the vibration angle of the vibration of the arrow a with respect to the horizontal direction. In this case, a so-called angle name plate as shown in FIG. 3 is conventionally used, which is made of rectangular thin paper (1), and an adhesive is applied to the back surface thereof. Further, a semicircular display line (2) symmetrical in the X direction and the Y direction perpendicular to the X direction is printed on this surface as shown in FIG. The scale line (3) is printed in the directions of degrees, 20 degrees, 30 degrees and 90 degrees.
Such an angle name plate (1) is shown on the side surface of the trough (5) which is parallel to the vibration surface including the vibration direction a of the linear vibration of the trough (5) of the electromagnetic vibration feeder (4) shown in FIG. Attached to That is, they are attached so that the direction of the X axis on the angle nameplate (1) is the bottom surface of the trough (5), that is, the horizontal direction. When the driving unit (6) is driven on this, linear vibration is performed in a predetermined direction. With this, the thinnest line among the scales (3) on the angle nameplate (1) is visually observed, and this angle scale is used. The operator detects the vibration angle by reading.

However, in the angle nameplate (1) as shown in FIG.
It is very difficult to stick the axis so that it is horizontal with respect to the trough (5), and usually causes some errors. Therefore, it has been difficult to measure an accurate vibration angle with respect to the horizontal direction. Furthermore, since each scale line (3) of the angle nameplate (1) vibrates to measure the direction of vibration from the afterimage of the retina, individual differences are large, and if the surrounding illumination is insufficient, it is even more accurate. Measurements cannot be made.

[Problems to be solved by the invention]

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a vibration angle measuring method capable of accurately measuring the vibration angle of a vibrating body regardless of the degree of skill of a measurer, regardless of ambient conditions. I do.

[Means for solving the problem]

The above-mentioned object is to mount the amplitude detecting element for detecting the amplitude of the vibration in the predetermined direction at the first position on a plane parallel to the vibration direction of the vibrating body to be measured and to perform the first detection of the amplitude detecting element. The output a is measured, and then attached to a second position perpendicular to the first position, a second detection output b of the amplitude detection element is measured, and the first detection output a and The second
From the detection output b And calculating a vibration angle of the vibrating body with respect to the first or second position by a trigonometric function from the value and the value a or b. Angle measurement method.

[Action]

The amplitude detecting element may be a piezoelectric element made of, for example, lead zirconate, which has directionality, and detects a vibration force, that is, an acceleration in the direction, and can calculate the amplitude based on the vibration force. By attaching this in a first direction, for example, in a horizontal direction, a first detection output a is obtained as an amplitude detection output of this direction component. Then, by mounting the sensor in a direction perpendicular thereto, the second detection output b can be obtained as a vertical component by the same amplitude detection element. From these detection outputs Is calculated by the CPU, the amplitude of the vibrating body can be obtained first.

Next, the CPU can calculate the angle of the vibration direction with respect to these directions and the direction at the first position or the direction at the second position and the trigonometric function. Normally, if the direction is horizontal, the vibration direction at the first position is referred to as the vibration angle, so that the normal vibration angle can be measured.

It should be noted that the vibration angle with respect to this mounting direction can also be measured by the method of the present invention when a predetermined direction, for example, some detection means is mounted, instead of the horizontal direction.

〔Example〕

Hereinafter, an embodiment that embodies a method of measuring a vibration angle according to an embodiment of the present invention will be described.

FIG. 1 shows an electromagnetic vibration feeder (4), and portions corresponding to those of FIG. 4 of the prior art are denoted by the same reference numerals, and detailed description thereof will be omitted.

According to this embodiment, a vibration angle measuring device (10) as shown in FIG. 2 is used. It has a cylindrical casing (12) on a mounting plate (11), inside which a mounting plate (1
A piezoelectric element made of lead zirconate is fixed as the amplitude detecting element (13) in parallel with 1). From now on, a lead wire (14) is derived, which is connected to the CPU (not shown). A thin straight line 1 is engraved on the surface of the casing (12) so as to be parallel to the detection direction of the amplitude detecting element (13) inside. As shown in FIG. 1, the amplitude detector (10) configured as described above has the mounting plate (11) on the side surface of the trough (5) and the bottom surface of the trough (4). The trough (5) is attached by the mounting plate (11) so that the line l is parallel, that is, oriented in the horizontal direction.
Attached to Due to the vibration of the trough (5), an amplitude detection output a is obtained from the detection element (13). This is the CPU
First, the memory is stored, and then the mounting position is changed in the direction shown by the dashed line in FIG. 1, that is, in the vertical direction, that is, the mounting position is shifted by 90 degrees from the above-mentioned position. In this state, a second amplitude detection output b obtained from the amplitude detection element (13) is also supplied to the CPU, and the second amplitude detection output b is obtained from the first detection output a and the currently supplied detection output b. Is calculated. By taking the cosine (COSINE) of this calculation result and the first detection value a, the angle of the vibration direction with respect to the first position is calculated. Therefore, the vibration angle of the trough (5) of the electromagnetic vibration feeder (10) can be accurately measured irrespective of the skill of the measurer and irrespective of the surrounding illumination.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiments, the case where the vibration angle of the electromagnetic vibration feeder is measured has been described. However, the vibration device as the measured object is not limited to this, and the present invention is applied to all the vibration devices. It is possible.

In the above embodiments, the amplitude detector is described as being made of a piezoelectric element made of lead zirconate. However, the invention is not limited to this, and any amplitude detection means that can be generally measured electromagnetically or optically is used. There may be.

〔The invention's effect〕

As described above, according to the vibration angle measuring method of the present invention, the vibration angle can be accurately measured irrespective of the skill level of the measurer and without being influenced by the surrounding lighting conditions.

[Brief description of the drawings]

FIG. 1 is a side view of an electromagnetic vibration feeder showing an embodiment embodying the method of the present invention, FIG. 2 is an enlarged perspective view of a vibration angle measuring device in FIG. 1, and FIG. FIG. 4 is a side view of an electromagnetic vibration feeder showing a situation where the angle nameplate is used. In the figure, (4) ... electromagnetic vibration feeder (10) ... vibration angle detector (13) ... amplitude detection element (piezoelectric element)

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01H 1/00 G01H 11/00

Claims (2)

(57) [Claims] An amplitude detecting element for detecting an amplitude of a vibration in a predetermined direction is provided on a surface parallel to a vibration direction of a vibration body to be measured.
It is attached to a first position and measures a first detection output a of the amplitude detecting element. Then, it is attached to a second position perpendicular to the first position and is attached to a second position of the amplitude detecting element. 2 from the first detection output a and the second detection output b. And calculating a vibration angle of the vibrating body with respect to the first or second position by a trigonometric function from the value and the value a or b. Angle measurement method. 2. The method according to claim 1, wherein the first position is in a horizontal direction.