JPH081026Y2 - Sieving machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sifter having a cylindrical sieve frame, which is suitable for sieving fine particles having strong cohesiveness and adhesion. .

(Prior Art) In order to screen fine particles having strong cohesiveness and adhesiveness, the present applicant has already constructed a screen frame with an upper screen frame and a lower screen frame having a slightly smaller size, and a mesh on the lower surface of the upper screen frame. With a fine mesh having a small wire diameter, and a mesh with a coarse mesh and a large wire diameter stretched on the upper surface of the lower sieve frame, with both screen frames in close contact with each other. We are developing a sieving machine that is coupled and capable of vertical vibration (Japanese Utility Model Publication No. 1-122888).

(Problems to be solved by the invention) The above-mentioned sieving machine has a small wire diameter and a low rigidity by vibrating the lower screen having a large wire diameter and a high rigidity, and thus a large vibration transmissibility. It is possible to vibrate evenly and strongly the upper sieve screen, which has a low vibration transmissibility, over the entire surface, and as a result, it is possible to efficiently and efficiently disperse fine particles with strong adhesion and cohesion without clogging or agglomeration. The effect that it can be sieved is exhibited.

However, the above-mentioned sieve mesh has a problem that the upper sieve mesh having a small wire diameter is struck by the lower sieve mesh having a large wire diameter and is broken in an extremely short period of time.

The present invention has been made in view of the above circumstances, and provides a sieving machine capable of efficiently sieving fine particles having strong adhesion and cohesiveness and extending the life of the upper sieving net. The purpose is to do.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a mesh made of a polymer wire rod having a double mesh structure as a lower mesh screen in a conventional sieving machine and having an elastic layer as an upper layer. The gist is that a net made of steel wire with a large wire diameter is provided in the lower layer.

That is, the present invention comprises a cylindrical upper screen frame having a screen screen stretched on the lower surface, and a lower screen frame having a screen screen stretched on the upper surface and having a diameter slightly smaller than the upper screen frame. A sieve machine in which both sieve frames are integrally joined in a state where their sieve meshes are in close contact with each other, and can be vertically vibrated, and the sieve mesh of the upper sieve frame is a fine mesh made of a steel wire rod having a small wire diameter. And the upper screen of the upper screen is made of an elastic polymer wire, and the screen screen of the lower screen is composed of two nets joined to each other. It is characterized by being woven with a coarse mesh, and the upper layer net is woven with a steel wire having a large wire diameter with a coarser mesh than the upper layer net.

(Structure) Hereinafter, the structure of the present invention will be described in detail based on embodiments.

FIG. 1 is a vertical sectional front view of a sifter according to the present invention, and FIG. 2 is an enlarged view of part A in FIG.

In the figure, (1) is a box-shaped base installed on the floor, and a plurality of springs (2) are arranged on the peripheral edge of the upper surface of the base (1). A disk-shaped vibrating table (3) is elastically supported.

An electromagnetic vibrating device (4) for vertically vibrating the table (3) is attached to the central portion of the lower surface of the vibrating table (3), and a bowl-shaped saucer is provided in a concave portion formed in the central portion of the upper surface. (5) is fitted and placed. (6) is a lower sieve frame having a cylindrical shape and provided with a flange (7) on an outer peripheral portion thereof, and the lower sieve frame (6) has a lower portion thereof into the saucer (5) by a predetermined depth. It is inserted and placed on the tray (5).

On the upper surface of the lower screen frame (6) are two meshes (8) (9).
A mesh screen composed by connecting the upper and lower parts (hereinafter referred to as the lower mesh screen)
(11) is stretched. The upper layer net (8) in the lower sieve net (11) is woven with a coarse mesh by a polymeric wire rod having elasticity, and the lower layer net (9) has a large wire diameter and therefore rigidity. Woven from a high-grade steel wire, the mesh of which is made coarser than that of the upper net (8). The nets (8) and (9) are integrally fixed to each other at their peripheral edges by a strong adhesive.

The lower sieve screen (6) attachment portion of the lower sieve frame (6) is provided on the outer peripheral portion of the lower sieve frame (6) and has a predetermined size lower than the upper end level of the sieve frame (6). Has been
As a result, the lower sieve screen (11) is designed to be located at the uppermost position of the lower sieve frame (6).

A plurality of guide rods (12) are erected at equal intervals on the peripheral edge of the upper surface of the vibrating table (3), and the guide rods (12) are sieve frames whose planar shape is an annular shape. The presser foot (13) is supported so as to be vertically movable, and the lower surface of the inner edge of the screen frame presser (13) is engageable with the upper surface of the flange (7) of the lower screen frame (6). There is.

Now, the attachment mechanism of the sieve frame retainer (13) and the guide rod (12) will be described in detail. The sieve frame retainer (13)
A plurality of guide cylinders (14) corresponding to the guide rods (12) are fixed to the outer peripheral part of the guide cylinders in the vertical direction, and the guide rods (12) slide on the guide cylinders (14). It is movably fitted.

The guide tube (14) can be fixed and locked to an arbitrary level of the guide rod (12) by a retaining screw (15), and the upper surface of the flange (7) of the lower sieve frame (6) is pressed against the sieve frame. The lower screen frame is fixed by pressing the screen screw (15) with the guide rod (12) via the guide tube (14) by tightening the retaining screw (15) and pressing the screen screw (15). (6) and the saucer (5) are fixed on the vibration table (3).

Reference numeral (16) is an upper sieve frame having a cylindrical shape slightly larger than the lower sieve frame (6) and provided with a flange (17) on the outer peripheral portion. The lower side of the upper screen frame (16) has an opening of 200
If it is less than μ, the upper mesh (8) in the lower sieve mesh (11)
A sieve mesh (hereinafter referred to as upper sieve mesh) (18) woven from a steel wire rod having a finer mesh than the above and an extremely small wire diameter is stretched, and the upper sieve frame (16) includes the upper sieve mesh (16). It is placed concentrically on the lower sieve frame (6) via the (18).

The upper sieve mesh (18) is a high-strength polymer material elastic body (19) whose planar shape adheres to the outer peripheral portion thereof forms a ring.
And the inner diameter of the elastic body (19) is slightly smaller than the inner diameter of the upper portion of the lower sieve frame (6). When the (16) is placed on the lower screen frame (6), the upper edge of the lower screen frame (6) is placed on the polymeric material elastic body (19) of the upper screen screen (18). Is designed to

On the upper surface of the flange (17) of the upper screen frame (16), a plurality of bolt holes (not shown) penetrating the lower surface are formed at equal intervals, and the flange of the lower screen frame (6) is also formed. (7)
Multiple screw holes (not shown) that penetrate through the top and bottom surfaces
Are formed so as to face the bolt holes, and adjustment screws (20) are inserted and screwed into the holes.

Then, when the adjusting screw (20) is tightened, the upper sieve frame (16) descends and the upper edge of the lower sieve frame (6) faces the elastic material (19) of the polymeric material in the upper sieve net (18). As a result, the elastic body (19) is elastically deformed and the upper sieve net (18) is evenly tensioned over the entire surface, and the upper sieve net (18) is moved to the lower sieve net (11). ), It is designed to be completely adhered to the entire surface.

At this time, the tension of the upper screen (18) is lower than that of the lower screen (1
It is adjusted to be higher than that of 1).

(Operation) Separation diameter is 200μ by the sieving machine configured as above.
A case of sieving fine particles having strong cohesiveness and adhesiveness will be described below. In the state shown in FIG. 1, when the sieved material is put into the upper sieve frame (16) and the electromagnetic vibration device (4) is driven, the vibration table (3), the saucer (5), the lower sieve frame (6). ) And the upper sieve frame (16) vibrate integrally, and together with this, the upper sieve screen (1
8) and the lower screen (11) vibrate vertically (primary vibration).

At this time, the upper screen mesh (18) has a relatively high tension, while the lower screen mesh (11) has a relatively low tension, so that they vibrate differently and Side sieve mesh (11)
Hits the upper sieve mesh (18) intermittently (secondary vibration).

Since the lower sieve mesh (11) is woven from a steel wire having a high rigidity in the lower mesh (9), the entire mesh surface vibrates uniformly and with a large amplitude, and the upper sieve mesh (11) Since it is in complete contact with the entire surface of (18), its vibration is sufficiently transmitted to the upper screen (18). As a result, the upper sieve screen (18)
Vibrates uniformly and with a large amplitude over the entire mesh surface, and the sieved material in the upper sieve frame (16) does not become clogged in the upper sieve mesh (18) and remains aggregated on the mesh. Without passing through, it passes through the lower screen (11) and falls onto the saucer (5).

In addition, since the upper screen (8) of the lower screen (11) is woven from a polymer wire material having elasticity, the shock when hitting the upper screen (18) is alleviated.

(Effects of the Invention) According to the present invention as described above, the upper mesh in the lower mesh reduces the shock when the upper mesh is hit by the lower mesh, so that the upper mesh breaks in a short period of time. Is prevented.

Incidentally, according to the experiment, the sieving machine of the present invention has almost the same sieving ability as compared with the conventional sieving machine, and the life of the upper sieving network is almost four times as long as that of the conventional sieving machine. I found out.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a vertical sectional front view of a sieving machine, and FIG. 2 is an enlarged view of part A in FIG. (6): Lower screen, (8): Upper screen (9): Lower screen, (11): Lower screen (16): Upper screen, (18): Upper screen (19) : Polymer material elastic body

Claims (1)

[Scope of utility model registration request] 1. A cylindrical upper sieve frame (16) having a sieve screen (18) stretched on the lower surface and a sieve mesh (11) stretched on the upper surface, and having a diameter slightly smaller than the upper sieve frame (16). And the lower sieve frame (6), which are integrally joined together with their sieve meshes (18, 11) in close contact with each other, and vertically vibrated. Which is a sieving machine, the sieving mesh (18) of the upper sieving frame (16)
Is woven with a fine mesh by a steel wire rod having a small wire diameter, and the screen mesh (11) of the lower screen frame (6) is composed of two meshes (8, 9) joined up and down, The upper net (8)
The upper wire frame (16) is made of a polymer wire having elasticity.
Of the sieve net (18) is woven with a coarser mesh, and the lower net (9) is woven with a steel wire having a larger wire diameter with a coarser mesh than the upper net (8). A sifter characterized by that.