JP2629009B2 - Vibration feeder - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a vibration feeder incorporating a magnet and a piezoelectric vibrator as an oscillator, which is used to divide a relatively small amount of a granular material, for example, a drug. And
The present invention relates to a vibration feeder including a height regulating member that regulates a moving amount of a granular material.

BACKGROUND OF THE INVENTION Generally, in a feeder for a granular material used for dividing and packaging a relatively small amount of a granular material such as a medicine to be dispensed to a patient at a hospital or a clinic, a magnetic material is generally used. The one incorporating a net vibrator is used.

In such a vibration feeder, the vibration is inevitably coarse, and therefore, in the case of a powdery substance such as a medicine having a small specific gravity, uneven conveyance occurs, and smooth conveyance is difficult. Therefore, in order to carry out minute division processing by transporting a very small amount, a skill is required to adjust the vibration state, and much time is required for adjustment.

Therefore, as a means for solving such problems, a feeder was developed which uses a piezoelectric vibrator as an oscillation source, controls a power supply frequency thereof, and adjusts the power supply frequency to find an optimum condition. However, conventional off-the-shelf gates are insufficient even for the magnet type and the piezoelectric vibrator type to convey the powder particles moving on the feeder shot in an equal amount.

That is, a gate is provided on the shot, and the thickness of the layer of the granular material that moves to the sending side on the shot of the feeder,
Even if an attempt is made to regulate with a gate, simply providing a gate does not make it possible to perform the desired fine division processing, and the flow state at the beginning and end of feeding may be greatly disturbed and unstable. I understand.

The problem to be solved: Therefore, the regulation by the gate provided on the shot is caused merely in order to keep the thickness of the layer of the moving granular material constant. The layers are disturbed and move in a so-called dango-like manner, and the supply amount in that section is not constant, so that it is difficult to perform operations such as highly accurate division processing.

Means for Solving the Problems: According to the present invention, there is provided a gate which solves the above-mentioned problems and enables powder particles flowing through the gate to flow uniformly and stably. A vibration feeder is provided.

That is, the vibration feeder according to the present invention is a vibration feeder operated by using a magnet and a piezoelectric vibrator, in a chute, having a fixed length in a conveyance direction and a height regulation for regulating a height of an object to be conveyed. A member is provided, and the tip of the height regulating member is inclined at an arbitrary angle with respect to the axis of the chute.

In the present invention, the tip of the height regulating member may be disposed with an inclination angle on either the left or right, or may be inclined with respect to the axis of the chute with both ends protruding from the center. It can also be shaped. In this case, it is preferable that the inclination angle of the tip of the height regulating member be in the range of 10 ° to 60 °.

Action: With such a configuration, when a desired powder or granular material is supplied to the upper rear portion of the shot and a voltage is applied to the magnet and the piezoelectric vibrator, the vibrator oscillates via the flexible leg piece. Vibration is transmitted to the shot, and the granular material supplied on the shot moves from the rear to the front end.

When the powder advancing on the shot reaches the front of the shot and is sent out in a thin layer by the height regulating member provided there, when the powder becomes a bridge state, Since the granules move along the front edge of the height regulating member, the bridge state is eliminated and first flows out from the sharp pointed end of the height regulating member,
The tip part gradually spreads along the height regulating member that is inclined, and then flows out from the entire width, so that the fluidized layer is conveyed while maintaining an orderly state without being disturbed.

Therefore, the thin-layered granular material sent out from the feeder can be received in the tray or the dividing box which moves laterally at a required interval, and the minute amount can be divided without any disturbance.

Such a flow phenomenon is that even when the height regulating member is formed in a so-called inverted V-shape in which the central portion is receded, it flows out from the point at the beginning of the flow, then flows out from the entire width, and then flows like the former. And can be transported without disturbance.

Examples: The present invention will be described below with reference to examples.

FIG. 1 shows an embodiment of a vibration feeder in which a height regulating member (hereinafter, referred to as a "gate" in the present embodiment) of the present invention is incorporated. (1) Two support plate pieces (2) whose upper part has receded at a required angle (with respect to the sending side) are erected on the support plate pieces (2) at appropriate intervals. Each is provided with a piezoelectric vibrator (3). A feeder shot (4) is connected to the upper end of each support plate (2), and a leg (5) attached to the lower surface thereof at the same inclination angle as the support plate (2) is connected by a leaf spring (6). , SHUT (4) are supported horizontally.

A gate (10) is provided at an appropriate position in the first half of the feeder (4) on both sides (4 ') of the feeder (4).
It is supported and attached to (4 '). The distance between the lower edge (11) of the gate (10) and the upper surface (4 ") of the shout (4) is set to about 0.5 to 2 mm so that it can be adjusted as needed.

The tip (12) of the gate (10) has a required angle with respect to the axis of the shot so that the right side is pointed toward the direction of feeding the granular material (indicated by an arrow) as shown in FIG. θ is inclined. This inclination angle can be arbitrarily selected and can be generally set in the range of 10 ° to 60 °.

The direction of inclination of the tip (12) of the gate (10) in the present invention may be either left or right.

By means of the feeder provided with the gate (10) having such a configuration, a powder having a normal particle size (powder: powder-like (gastrointestinal), fine granules: 0.01 to 0.15 mm in diameter (gastrointestinal antacid), granules ... The flow state was confirmed using a circle or a corner having a diameter of 1 to 3 mm (antipyretic, analgesic), and the results were as follows.

Handling particles: Angle of repose (degree) Apparent density (g / cm ³ ) Powder 37 ゜ to 55 ゜ 0.29 to 0.78 Fine 34.8 ゜ to 40 ゜ 0.49 to 1.06 Granules 37.7 ゜ to 42 ゜ 0.57 to 0.72 Magnetic vibration Number: 100-120Hz Vibration frequency of the piezoelectric vibrator: 100-300Hz Gap between the lower edge of the gate and the upper surface of the shot: 0.5-1.5mm When the powder (A) is transported under these conditions, As shown in FIG. 3 (a), as shown in FIG. 2, the gate (10) was conveyed at a tip (12) with an inclination angle of about 30 °.

At the beginning of the flow, it flows out like a string from the point (a) of the gate and gradually spreads over the entire width and flows.

As the flowing granular material (A) neared the end, the state where the powder and the granular material (A) approached the tip (A) of the inclined portion again and finished flowing was shown.

As a result of such a flow state, no disturbance was caused in the flow of the granular thin layer from the start to the end of the feeding.

As shown in FIG. 3 (b), the tip of the gate (10) (1
In the case where the inclination of 2) was reversed and the inclination angle was set to about 45 °, the same embodiment as the above example was shown.

Further, as shown in FIG. 3 (C), the tip (12) of the gate (10) is inclined at an angle of about 45 ° to both sides with respect to the center of the width, and the gate is V-shaped. Shape. In this state, the state of flowing out from the point (a) and (a) again, and gradually approaching the end, gradually flows toward the point of the inclined portion again.

As a comparative example, as shown in FIG.
When the tip (11) of (0) is formed so as to be perpendicular to the axis of the shot (4), the flow is not uniform even in the thin layer even at the beginning and end of the flow, and the flow is disturbed, so-called dango-like. It can be seen that the feed amount becomes non-uniform.

In this way, by making the tip of the gate inclined with respect to the axis of the shot, the flow rate is reduced at the beginning and end of the flow, but a uniform and stable flow rate is maintained throughout,
Fine feed can be achieved by reducing the gap between the gates. Such a state is caused by a difference in resistance between the inside (rear side) of the gate and the outside of the gate at the beginning of the outflow of the powder and granules flowing through a small gap. First, the granular material moves inside the gate to the point where it becomes the most advanced state, descends through the gate as it is pushed by subsequent particles, flows out along the front edge of the gate, and is guided by this Gradually, the particles spread all the way through the gate and flow. Then, as the flowing granular material approaches the end, the flow ends again with a bias toward the tip of the inclined portion. On the other hand, if it is attempted to flow out from the gate tip at the same time, the difference in resistance occurs over the entire width, which can be presumed to be a cause of disturbance, and the difference becomes clear.

Further, Table 1 shows the results of a test in which a medicine is divided and packaged in a minute amount using a gate having an inclined angle and a gate perpendicular to the flow. According to this, it is found that the feeder provided with the gate of the present invention is good.

Advantageous Effects of the Invention: According to the present invention, the transfer state of a granular material by a vibration feeder using a magnet or a piezoelectric vibrator can be made to flow in a uniform amount with a simple configuration, and the flow starts and ends. Can be processed without causing large disturbances, so that a remarkable effect can be obtained particularly in the division processing of a very small amount of a drug (for example, 0.05 g / 1 packet × N packets).

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a vibration feeder provided with the gate of the present invention, FIG. 2 is a plan view showing a gate disposing portion on a shot, and FIG. (1) Base, (2) Support plate (3) Piezoelectric vibrator (magnet), (4) Feeder shot (4 ') Side plate (4 ") Upper surface of shot (5) Leg piece, (6) Leaf spring (10) Gate, (11) Lower edge of gate (12) Tip, (A) Powder

Claims (4)

(57) [Claims] In a vibration feeder operated by using a magnet and a piezoelectric vibrator, a height regulating member having a fixed length in a conveying direction and regulating the height of an object to be conveyed is provided in a chute. A vibration feeder characterized in that the tip of the height regulating member is inclined at an arbitrary angle with respect to the axis of the chute. 2. The vibration feeder according to claim 1, wherein a tip portion of said height regulating member is disposed so as to be inclined at one of right and left. 3. The vibration according to claim 1, wherein the tip of the height regulating member is inclined with respect to the axis of the chute with both ends protruding from the center. feeder. 4. The vibration feeder according to claim 1, wherein an inclination angle of a tip portion of said height regulating member is in a range of 10 ° to 60 °.