JPH0149553B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a vibrating sieving device for sieving powder and granular materials such as paints and ceramic materials, and in particular, a vibrating sieve device that uses a counterweight vibrator to sieve a sieving wire mesh parallel to the mesh surface. The present invention relates to an in-plane reciprocating type vibrating sieve device that applies vibrations having vibration components in different directions.

(Prior art) This type of conventional vibrating sieving device supports a sieving wire mesh horizontally or tilted on the sieve body, and one or two counterweight vibrators are installed on the sieve body. It is generally configured to vibrate the sieving screen by horizontal vibration to sieve the material and send it forward.

However, conventional vibrating sieving devices that mainly use this type of horizontal vibration have a problem with the powder layer due to the nature of the material being processed, especially when processing large amounts of light powder or fine powder with low bulk specific gravity. The wire mesh becomes thick, and the stratification effect does not occur reliably, and the mesh gets clogged with powder and granules, and sometimes the powder and granules accumulate locally on the wire mesh, resulting in low sieving efficiency. There is a problem.

As a countermeasure to this problem, the wire mesh is tilted several degrees with respect to the horizontal and supported on the sieve body, but a large component of vibrating force is constantly applied perpendicularly to the screen surface. As a result, a strong air current is generated on the screen surface, and there are few opportunities for the powder to float up and come into contact with the screen surface, which not only reduces the sieving efficiency, but also causes a large 2. There was a problem that secondary vibration occurred and the life of the wire mesh was shortened.

(Problems to be Solved by the Invention) The present invention is intended to solve the above-mentioned problems, and is capable of eliminating clogging caused by powder and granules, has a large dispersion effect of powder and granules, has a good stratification effect, and can be used for sieving. The purpose is to provide a highly efficient vibrating sieve device.

(Means for solving the problem) According to the present invention, in order to achieve the above-mentioned object,
As shown in the drawing, counterweight vibrators 3 and 4 are installed on the top and bottom of the sieve body on a vertical line C passing through the center of gravity of the sieve body 2 supporting the sieving wire mesh 1, and these vibrators 3 and 4 are moved in opposite directions. The invention is characterized in that it is equipped with a drive device that rotates synchronously.

Further, according to the present invention, the end 1a of the sifting wire mesh 1 on the inlet side for the powder and granular material to be processed is pivotally connected to the horizontal pivot shaft 5, and the vertical vibration device 6 is connected to the outlet end 1b, so that the sifting wire mesh 1 is horizontally connected to the sifting wire mesh 1. It is preferable to configure it so as to give a low frequency vibration of a minute angle with the upper limit being the position.

(Function) According to the present invention, by having the above-described structure, the horizontal back and forth vibration component of the sieving wire mesh is significantly increased, and almost complete horizontal vibration can be applied to the sieving wire mesh. The powder introduced from the mouth is moved forward along the mesh surface, significantly reducing the occurrence of clogging, increasing the dispersion effect, and creating a stratification effect.

Furthermore, the sieving efficiency can be further improved by adjusting the amplitude and frequency of the vertical vibration device connected to the exit side end of the sieving wire mesh according to the properties of the powder to be processed.

(Embodiment) FIG. 1 shows one embodiment of the present invention. In the example shown in the drawing, the sieve body 2 supporting the sieving wire mesh 1 is configured in a box shape, and the sieve body 2 supporting the sieving wire mesh 1 Counterweight type vibrators 3 and 4 are respectively installed on the top cover 10 and bottom plate 11 of the sieve body 2 at positions above the vertical line C passing through the center of gravity of the sieve body 2.
are synchronously rotated in opposite directions at the same speed by motors (not shown), thereby generating vibrations in the horizontal direction parallel to the screen surface due to self-synchronization.

The sieve body 2 has one end 2a in its length direction.
The upper lid 10 is provided with an input port 12 for the powder to be processed, and the bottom plate 11 is provided with a discharge port 13 for the powder and granular material under the sieve, and the vibration of the sieve body is transmitted to the base 14. It is supported by an anti-vibration spring 15 to prevent it from moving.

The sieving wire mesh 1 is attached to a mesh frame 16 and extends in the length direction inside the sieve body 2, and its powder inlet side end 1a is pivoted to the sieve body 2 by a horizontal pivot shaft 5. The outlet end 1b is supported so as to be moved up and down by a vertical vibration device 6, and the outlet end 1c passes through an outlet 18 for the powder on the sieve which opens in the end wall 17 of the sieve body 2. The powder and granules on the sieve are projected out of the main body 2 and are passed through the outlet end 1.
It is configured to be discharged from c.

The vertical vibration device 6 applies minute angular vibrations of several degrees to the sieving wire mesh with a frequency of 1 to
It is configured to feed at a long cycle of about 20 cpm, and in the illustrated example, it is composed of a crankshaft 20, a link 21, and a motor drive device (not shown) that rotates the crank at a low speed. Any suitable vibrating device may be used. It is preferable that this vertical vibration device is configured so that its vibration angle, vibration frequency, etc. can be adjusted so that the optimum vertical vibration can be applied in accordance with the properties of the powder or granular material to be treated.

When the apparatus configured as described above is operated, the sieve body 2 is caused to vibrate back and forth in the horizontal direction by synchronously rotating the upper and lower vibrators 3 and 4 in opposite directions at the same speed. Therefore, the screen frame 16 attached to the sieve body 2 by the pivot shaft 5, and therefore the sieve wire mesh 1, vibrate back and forth in the horizontal direction due to the vibration of the sieve body 2.

When the granular material to be treated is vibrated in this manner and is introduced from the inlet 12 onto the inlet side end 1a of the sifting wire mesh 1, the granular material moves forward along the mesh surface due to the back and forth vibration of the mesh surface. During this time, the particles are sequentially sieved, and particles smaller than those on the screen surface pass through the mesh of the wire mesh 1 and fall onto the bottom plate 11 of the sieve body 2.
The particles under the sieve are sent forward on the bottom plate 1 by the vibration of the sieve body 2 and are discharged from the discharge port 13. On the other hand, particles on the sieve that are larger than the mesh are discharged from the outlet end 1c of the sieving wire mesh 1.

For example, when processing a large amount of light and fine powder such as ceramic powder, use a 200-mesh sieving wire mesh and use a vibrator 3
The frequency of the vibration is 750 cpm, which produces horizontal vibration with an amplitude of 24 mm. Furthermore, by applying vibration at an angle of 5 degrees downward at a frequency of 10 cpm to the screen surface with the horizontal upright position as the upper limit, using the vertical vibration device 6, low frequency vibration in the vertical direction is added to the screen surface. As a result, intermittent secondary vibrations are generated on the mesh surface, and even particles having the above-mentioned properties can be efficiently screened out by stratification without causing local retention.

(Effects of the Invention) According to the present invention, high sieving efficiency can be obtained due to the large dispersion effect of the powder and the good stratification effect.

[Brief explanation of drawings]

The drawing is a diagrammatic longitudinal section through a vibrating sieve device according to the invention. 1...Sieving wire mesh, 2...Sieve body,
3, 4... vibrator, 5... horizontal pivot shaft,
6... Vertical vibration device, 10... Top lid, 11... Bottom plate, 12... Inlet, 13... Outlet.

Claims (1)

[Claims] 1 Counterweight type single-axis vibrators are installed above and below the sieve body on a vertical line passing through the center of gravity of the sieve body that supports the sieving wire mesh, and a device is provided to rotate these vibrators in opposite directions in synchronization. A vibrating sifting device characterized in that an end on the powder or granular material inlet side is pivotally connected to a horizontal pivot shaft, and a vertical vibrating device that applies minute angular vibrations to the sieving wire mesh with the upper limit at the horizontal position is connected to the outlet side end.