JP3169435B2 - Vibration feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic vibration type feeder mainly used for a combination weigher, and more particularly to a small size vibration feeder suitable for an object to be processed having poor supply characteristics.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic vibration type feeder using a leaf spring employed in a combination weigher has a tray 1 as shown in FIG. The lower end is attached to and supported by the upper frame 2, and the upper frame 2 is connected and supported at its lower end by a plurality of leaf springs 3 fixed to a bed 4. Magnet coil 6 is bed 4
The movable core 5 is provided on the upper frame 2 with a gap t. The leaf springs 3 are arranged at an inclination of 20 ° with respect to the vertical direction, and are assembled so that the magnet coil 6 is attracted in the horizontal direction.

[0003]

In the above-mentioned conventional electromagnetic vibration type feeder, a feeder having a poor supply characteristic, such as broiler meat, pickles, dried plums, fresh oysters, cut vegetables, gummy candy, etc., is to be conveyed. When handling, it is necessary to increase the amplitude of the vibration. Therefore, the present inventor has proposed a feeder capable of increasing the amplitude of the tray and increasing the vertical component of the vibration component of the tray (Japanese Patent Application No. Hei 3-23166).
No.). In this prior art, as illustrated in FIG. 3, the magnet 6A is tilted at a large inclination angle (for example, 15 °) to the opposite side from the vertical line passing through the tray support 7 when the magnet 6A is sent out. 2 leaf springs 3A
Thus, one having a configuration inclined to 0 ° or more (specifically, 45 °) was obtained. In the drawings, reference numeral 1 denotes a tray, 2A denotes an upper frame, and 4 denotes a bed. However, in the electromagnetic vibration type feeder 1A of this type, the magnet 6A is constituted by one set. As a result, the size of the driving magnet increases, and the size of the entire feeder also increases. As a result, it is difficult to adapt the combination to a combination weigher having a relatively small capacity and a small size.

That is, as shown in FIG. 4, a combination weigher A has a plurality of feeders 1A to a measuring section arranged radially around a dispersion feeder B arranged at the center, and a lower outer portion of each feeder 1A. Are provided with a supply hopper (not shown) and a weighing hopper (not shown), respectively. The maximum outer diameter D shown in this figure is the diameter of the main body of the combination weigher A having a substantially circular shape. Is limited by the number of each feeder 1A and the width of the tray of that feeder 1A. Therefore, when the magnet coil 6A is large, the diameter of the combination weigher A is also increased, and it is difficult to reduce the diameter of the combination weigher A.

[0005] Further, since the amplitude of the vibration increases, the deflection of the leaf spring during the vibration increases, and as a result, there is a problem in the durability of the leaf spring. Furthermore, since the amplitude at the time of vibration increases, the gap between the magnet coil and the movable core increases, the current value increases, and a large power supply control unit is required. Further, there is a problem in the heat generation capacity of the magnet coil.

Therefore, in the present invention, in an electromagnetic vibration type feeder including a magnet and a leaf spring, by using two sets of relatively small magnets, the vibration component can be increased and the whole can be downsized. The purpose is to provide a vibration feeder.

[0007]

In order to achieve the above-mentioned object, the present invention is directed to a plate spring connecting a bed and an upper frame supporting a tray, which is fed out against a vertical line passing through the tray support. Side, the two magnets for vibration tilt the suction direction at a certain angle with respect to the tilt of the leaf spring, and the suction force of the magnet for vibration increases the upper frame and the tray support. The leaf spring is arranged so as to act in the vicinity of the connection portion with the base to obtain a vibration force in the bending direction of the leaf spring.

[0008]

According to the present invention, the resultant force of the two magnets for vibration is arranged so as to vibrate in the bending direction of the leaf spring, and the amplitude of the tray and the vibration component in the vertical direction are provided. Has a function to smoothly supply even an object to be treated having a poor supply characteristic,
In addition, the size of the magnet for vibration can be reduced, so that the width of the feeder can be reduced, and the overall size can be reduced.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vibration feeder according to the present invention. FIG. 1 is a front view of a specific example of the vibration feeder of the present invention.

In this figure, a tray 10 has a tray
10 The lower end of the tray mount 11 fixed at the approximate center of the lower surface is integrated with the upper frame 12, and the upper frame
It is supported at a required height by a plurality of leaf springs 14 connecting the bed 12 and the bed 15. As shown in FIG. 1, the leaf spring 14 has a lower end attached to the bed 15 and an upper end inclined to the front and rear ends of the upper frame 12. Note that, in this specific example, the leaf spring 14 is
And one on the rear side (but is not limited to this).

Movable core 1 of magnets 16 and 16 'for vibration
Reference numerals 8 and 18 'are attached to the upper and lower surfaces of the upper frame 12 at a predetermined angle (described later) at positions near the connecting portion with the tray mounting base 11. The magnet coils 17, 17 'are fixed on the bed 15 by supporting pieces 19, 19' with a required gap from the movable cores 18, 18 '. Reference numeral 21 denotes a buffer coil spring, which is provided to prevent the vibration from the vibration feeder from being transmitted to the main body of a combination weigher to which the vibration feeder is attached.

The magnet 16 for obtaining the vertical vibration component for the vibration is provided with the suction direction inclined at 15 ° with respect to a vertical line a passing through the center of the tray mounting base 11, and the horizontal vibration component is provided. The magnet 16 'is provided at an angle of 75 ° with respect to the vertical line a. Each leaf spring 14 is provided at an inclination of 45 ° with respect to the vertical line a. Therefore, the magnets 16 and 16 'are attached to the leaf spring 14 at θ ₁ = θ ₂ = 30 ° with respect to the attraction direction, and the directions of the inclination angles thereof are reversed.

Here, when the movable core 18 is attracted by the excitation of the magnet coil 17, the leaf spring 14 bends. If the attraction force of the magnet 16 is F, the bending direction of the upper frame 12 due to the leaf spring 14 at that time. The displacement force E is as follows: E = Fsin30 °° E = １ ／ F Also, the movable core 18 'is excited by the excitation of the magnet coil 17'.
Is attracted, the leaf spring 14 bends and its magnet 16 '
Assuming that the suction force of the upper frame 12 is F ', the displacement force E' in the bending direction of the upper frame 12 due to the leaf spring 14 is E '= F'sin 30 ° E' = 1 / 2F '. This displacement force E = E ′, and is in the same direction. Therefore, the resultant force by the attraction of the magnets 16 and 16 'is E + E'
Acting at the position on the upper frame 12 where the action lines bb and cc of the two magnets 16 and 16 'intersect each other,
+ E 'is applied.

As described above, the present invention has the further advantage that a high amplitude can be obtained by greatly inclining the leaf spring 14 for supporting the tray 10 obtained in the prior application and inclining the magnet in the retreating direction. By improving the angle of attraction of the magnets 16, 16 ′ to the leaf spring 14 at an angle of 30 °, the attraction force decreases in the bending direction of the leaf spring 14. 16 'makes it possible to obtain a large amplitude with a small suction gap.

By using two small magnets in this way, the dimension in the width direction can be naturally made smaller than that of a large magnet. Therefore, this vibration feeder is used for supplying a combination weigher. The position of the magnet can be brought closer to the center of the main body of the combination weigher arranged in a circular arrangement, and the tip of the tray of the vibrating feeder in the outer peripheral direction can also be accommodated at a position short from the center. It is possible to reduce the overall diameter by reducing the outer diameter of the. Since the vibration feeder of the present invention is miniaturized and the supply performance is enhanced, it is effective to use the vibration feeder alone.

[0016]

According to the present invention, it is possible to obtain a high-amplitude performance by reducing the size of the vibrating magnet, to reduce the size of the entire feeder, and to provide a vibrating feeder for handling an object having poor supply characteristics. It is useful to incorporate into a combination weigher.

[Brief description of the drawings]

FIG. 1 is a front view showing a specific example of a vibration feeder according to the present invention.

FIG. 2 is a front view of a supply vibration feeder incorporated in a conventional combination weigher.

FIG. 3 is a front view of a supply vibration feeder incorporated in the combination weigher according to the prior application technology.

FIG. 4 is a diagram illustrating a gist of an arrangement of a supply vibration feeder in the combination weigher.

[Explanation of symbols]

 Reference Signs List 10 tray 11 tray mounting base 12 upper frame 14 leaf spring 15 bed 16, 16 'magnet for vibration 17, 17' magnet coil 18, 18 'movable core 19, 19' support piece

Claims (1)

(57) [Claims] 1. A leaf spring connecting an upper frame supporting a tray and a bed is sent out with respect to a vertical line passing through a tray supporting portion and is inclined to the opposite side, and two vibrating magnets move in a suction direction thereof. Is inclined at a fixed angle with respect to the inclination of the leaf spring, and the attractive force of the magnet for vibration acts near the connecting portion between the upper frame and the tray support base to cause the deflection of the leaf spring in the bending direction. A vibration feeder, which is provided so as to obtain a vibration force.