JP2534545Y2 - Dispersion feeder for combination weigher - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an electromagnetic vibration type dispersion feeder using a leaf spring used for a combination weigher.
The present invention relates to a dispersion feeder for a combination weigher, which is improved so that the dispersion performance can be improved even for a processing object having poor dispersion characteristics.

[0002]

2. Description of the Related Art As a conventional electromagnetic vibration type dispersion feeder using a leaf spring, as shown in FIG.
A plurality of leaf springs 16 in which a mounting piece 12 and a bed 15 provided at a central portion on the back side of a flat conical distribution table 10 are inclined.
Are connected by A configuration in which a movable core 17a is provided on the mounting piece 12 at a predetermined interval from a magnet coil 18 mounted on a bed 15 is known.

[0003] When the movable core 17a is attracted by energizing the magnet coil 18, such a dispersion feeder is used.
The suction direction is the vertical direction, but the plurality of leaf springs 16 supporting the dispersion table 10 directly on the bed 15 are inclined in the same direction in the circumferential direction (usually an inclination angle of 20 ° with respect to the vertical direction). ), A reciprocating spiral vibration motion is performed with respect to the center axis a. The reciprocating spiral vibration is composed of a component in a rotational direction and a component in a vertical direction with respect to the center axis a. For an object to be processed having poor dispersion characteristics due to such vibration, for example, as shown in Table 1, it is desirable that the reciprocating helical vibration of the conical dispersion table is large, and in particular, the object to be processed is separated from the surface of the dispersion table. It is desirable that the vertical vibration component is large as an operating component for the operation.

[Table 1]

The magnitude of the reciprocating spiral vibration depends on the vibration component (vertical direction) in the gap direction between the magnet coil 18 and the movable core 17a and the inclination angle (20 ° with respect to the vertical) of the plurality of leaf springs 16. Although the vertical vibration component is the same as the vertical vibration component of the movable core 17a at any position of the dispersion table 10 and is constant, the vibration component in the rotation direction naturally has a large portion near the outer periphery in the radial direction. Become.

[0005]

However, such a conventional distributed feeder has the following problems. (1) with respect to the angle in the vertical direction of the leaf spring supporting the dispersion table, with respect to the amplitude gamma ₁ of the leaf spring because it is 20 °, the amplitude h ₁ in the vertical direction is _{h 1 = γ 1 sin20 ° =} 0.342γ 1 ----- (1) and a small value. (2) It is necessary to increase the amplitude of the leaf spring in order to achieve the desired purpose when the vibration component in the vertical direction is large, and the durability (fatigue limit) of the leaf spring decreases. (3) If the amplitude of the leaf spring is increased, the vibration component in the rotation direction becomes too large in the vicinity of the outer periphery of the dispersion table, so that the momentum of the object to be processed becomes too large, and normal dispersion characteristics cannot be obtained. (4) If the amplitude of the leaf spring is increased, the momentum near the outer periphery of the distribution table increases, and a driving force for the magnet coil is necessary.Therefore, it is necessary to prepare a large-capacity vibration magnet coil. There is. (5) In the conventional method, it is also possible to maintain the balance of the vibration component between the vertical direction and the rotation direction of the dispersion table by inclining the inclination angle of the leaf spring by about 45 ° from the vertical direction. The vibration component in the gap direction between the coil and the magnet coil increases. This is disadvantageous because the attractive force of the magnet coil is weakened by the square of the gap.

In the conventional dispersion feeder, the mounting angle of the leaf spring 16 is about 20 ° with respect to the vertical direction, and the principal load stress is essentially the leaf spring against the circumferential vibration of the dispersion table. This is close to the bending load condition in the thickness direction of No. 16.

When handling an object having poor dispersion characteristics, the reciprocating spiral vibration is applied to the dispersion table as described above, so that the vertical vibration component as well as the circumferential vibration component can be increased. It is desirable to do. In order to obtain such functionality, increasing the inclination of the leaf spring 16 is considered as one requirement.

However, as the inclination angle of the leaf spring 16 approaches the horizontal direction, the stress generated in the leaf spring 16 becomes larger due to bending in the width direction. Therefore, as a means of reducing the stress in the width direction of the leaf spring, the width dimension of the leaf spring 16 is shortened, and in order to obtain a necessary spring constant, a method of increasing the number of combined leaf springs 16 is also considered. In this case, the bolt mounting hole for mounting the leaf spring 16 becomes weak, and it becomes difficult to maintain the spring constant of the leaf spring 16. However, it is necessary to increase the dimension of the leaf spring holding plate in the mounting portion in the length direction of the leaf spring. Since it is preferable that the dimension in the height direction is smaller as the dispersion feeder, increasing the number of leaf springs and increasing the overall thickness of the mounting portion is a means that is difficult to adopt because it is contrary to its purpose. .

In the present invention, a combination weigher capable of increasing the vibration components in the rotational direction and the vertical direction for an object to be processed having a poor dispersion characteristic without complicating the structure by solving the problems of the conventional type. The purpose of this is to provide a distributed feeder.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to a distributed balance feeder for a combination weigher having a vibration mechanism using a vibrating magnet coil and a leaf spring, wherein a plurality of sets of a magnet coil and a movable core are arranged. And the movable core, the suction direction is provided to be inclined at a required angle with respect to the central axis of the dispersion table, and the leaf spring on which the dispersion table is supported is provided to be inclined at least 20 ° with respect to the vertical direction. It is.

In the present invention, it is preferable that the upper and lower mounting brackets of the leaf spring on the distribution table side and the bed have a flexure structure perpendicular to the bending direction of the thickness of the leaf spring. It is preferable that a plurality of pairs of the magnet coils and the movable cores be provided in the same number as the number of leaf springs and be provided less than the number of leaf springs.

[0012]

According to the dispersion feeder configured as described above,
By dispersing the vibration source, the circumferential vibration component and the vertical vibration component are increased to an acceptable range, and the workpiece can be quickly lifted on the dispersion table and can also proceed in the circumferential direction quickly. Such a dispersing function is operated. In addition, the bending stress in the width direction with respect to the leaf spring, which is generated to effectively apply both the circumferential and vertical vibration components as described above, is absorbed by the flexure structure portion provided in the leaf spring mounting bracket. And the dispersion characteristics can be improved.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dispersion feeder according to the present invention; FIG. 1 is a longitudinal sectional front view of the dispersion feeder of the present invention used for the combination weigher, and FIG. 2 is a view taken along the line AA in FIG. In these figures, the dispersing table 10 is formed in a conical shape, and a mounting piece 12 fixed to the back surface is connected to an upper portion of a plurality of leaf springs 16 (four in the specific example) whose lower end portions are mounted and supported on a bed 15. The movable core 17 is connected to a proper position by the attachment piece 12. Further, magnet coils 18 are provided on support pieces 19 erected on the bed 15 in opposition to the movable core 17.

The leaf spring 16 is inclined at an angle of 20 ° or more with respect to the vertical direction, and in this example, at an angle of 45 °. , Each is attached. Also, each magnet coil 18 has a suction direction of 15 ° with respect to the vertical direction.
Mounted at an angle. Of course the suction surface also movable core 17 provided to face the respective magnet coils 18 are arranged while maintaining a gap t _2.

With this configuration, the crossing angle between the attracting direction of each magnet coil 18 and the vibration direction of the dispersion table 10 is 60 ° (see FIG. 1).

The comparison between the method of the present invention and the conventional method is as follows: (i) The amplitude h _{2 in the} vertical direction with respect to the amplitude γ _{2 of the} leaf spring is h ₂ = γ ₂ sin45 ° = 0.707γ ₂ --- --- (2) when the amplitude of the leaf spring are the same (1), (2) vibration component in the vertical direction to _{h 2 / h 1 = 0.707γ /} 0.342γ = 2.07 Movies invention consists equation about Double. (ii) the amplitude x ₁ in the rotation direction of the plate sprung suction direction to the amplitude t ₁ of the conventional method is _{x 1 = t 1 tan20 ° =} 0.364t 1 ----- t 1 = 2.75x 1 present invention method in amplitude x ₂ in the rotational direction of the suction direction of the amplitude t leaf sprung against ₂ to obtain the amplitude of the _{x 2 = tz sin15 ° = 0.259t} 2 ----- t 2 = 3.86x 2 the same direction of rotation _{t 2 / t 1 = 3.86x /} 2.75x = 1.4 times the gap is required. (iii) However, since the amplitude of the leaf spring for achieving the purpose of increasing the vertical vibration component can be made smaller than that of the conventional method, the durability of the leaf spring can be improved. (iv) Even if the amplitude of the leaf spring is increased in order to increase the vertical vibration component, the vibration component in the rotation direction near the outer periphery of the dispersion table can be reduced as compared with the conventional method. Easy dispersion characteristics are easily obtained.

By adopting the structure of the present invention, a dispersion feeder having improved dispersion characteristics as compared with the conventional one can be obtained. However, as described above, the leaf spring supporting the dispersion table 10 is used. When the tilt angle of the 16 is 20 ° or more with respect to the vertical direction, specifically, at a maximum of 45 °, the displacement amount in the rotation direction becomes large. Therefore, as a matter of course, the load stress on the leaf spring 16 increases with respect to the vibration in the rotational direction. In other words, as the inclination angle of the leaf spring 16 increases, the load stress of the leaf spring becomes greater due to the bending stress in the width direction of the leaf spring than the conventional bending stress in the thickness direction of the leaf spring. Therefore, it is necessary to cope with the increase in the applied stress as compared with the conventional case where the inclination of the leaf spring is small.

Therefore, in the present invention, as shown in FIGS. 3 and 4, the leaf spring 16 is attached to the upper and lower mounting brackets 13A, 14A of the leaf spring 16 with respect to the mounting piece 12 of the distribution table 10 and the bed 15. A flexure structure 20 is employed so that the bending direction is orthogonal to the 16 planes. As the flexure structure 20, the notch grooves 21, 21 having bulges at the notch end portions, which are orthogonal to the mounting axis direction, are provided on the mounting brackets 13A, 14A.
At the center in the width direction, a required thickness T that can have flexibility between the leading end portions of both the cut grooves 21 and 21 (in a specific example, the thickness is equal to or slightly larger than the thickness of the leaf spring 16). ) To form a notch. In addition, while adopting the mounting means of the flexure structure 20, a leaf spring
In order to more securely fix the 16 mounting brackets 13A and 14A, it is preferable to increase the size of the leaf spring holding plate 22 in the length direction of the leaf spring.

In the present invention, the mounting portions 13A and 14A having the flexure structure 20 are employed in the mounting portions of the leaf springs 16, so that the spring constant of the leaf springs 16 can be increased in order to improve the spring constant of the leaf springs 16. The width can be increased, and the leaf spring 16
Can be dealt with without increasing the number of sheets used.

[0020]

As described above, according to the present invention, a dispersion feeder that handles an object having poor dispersion characteristics can improve the dispersion characteristics without complicating the vibrating structure portion, and can improve the dispersion characteristics. It has become easy to improve the durability of a leaf spring that transmits vibration to the table.

[Brief description of the drawings]

FIG. 1 is a partial vertical front view of an embodiment of a dispersion feeder for a combination weigher of the present invention.

FIG. 2 is an AA view in FIG.

FIG. 3 is a detailed view showing an aspect of a leaf spring attached by an attachment having a flexure structure.

FIG. 4 is a BB view in FIG. 3;

FIG. 5 is a view showing a conventional example of a dispersion feeder for a combination weigher.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 dispersing table 12 mounting pieces 13, 14 mounting fittings 13A, 14A mounting fitting with flexure structure 15 bed 16 leaf spring 17 movable core 18 magnet coil 19 support piece for magnet coil 20 flexure structure 21 cut groove 22 leaf spring holding plate

Claims (4)

(57) [Scope of request for utility model registration] 1. A distributed feeder for a combination weigher having a vibration mechanism using a vibrating magnet coil and a leaf spring, a plurality of sets of a magnet coil and a movable core are arranged.
The magnet coil and the movable core are provided so that the suction direction is inclined at a required angle with respect to the central axis of the distribution table, and the leaf spring on which the distribution table is supported is inclined at an angle of 20 ° or more with respect to the vertical direction. A dispersion feeder for a combination weigher, characterized in that: 2. A flexure structure orthogonal to a bending direction of the thickness of the leaf spring is provided on both the upper and lower mounting brackets of the respective leaf springs on the dispersion table side and the bed.
5. The dispersion feeder for a combination weigher according to item 1. 3. The dispersion feeder for a combination weigher according to claim 1, wherein a plurality of pairs of said magnet coils and movable cores are provided in the same number as the number of said leaf springs. 4. The dispersion feeder for a combination weigher according to claim 1, wherein a plurality of pairs of magnet coils and movable cores are provided in a smaller number than the number of leaf springs.