JPH0339757B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a sieving machine.

PRIOR ART The sieving machine according to the original patent includes a sieving box having at least one sieving fabric surface tilted from a sieving material inlet to a sieving material outlet, the sieving fabric surface being arranged at an angle from the sieving material inlet to the sieving material outlet. It can be directly excited by the protruding pieces distributed over the entire surface of the cloth surface and vibrating up and down, and each of these protruding pieces generates a plurality of shocks provided under the sieving fabric surface. Via a lever, it is supported by rods oriented at right angles to the direction of feed of the sieved material, the ends of each rod being arranged along and approximately at the same height as the surface of the sieved fabric. The bars are supported on the sieving box via elongated deflection springs, and the bars are vibrated via a common push rod with vibrations of adjustable frequency and amplitude.

OBJECT OF THE INVENTION It is an object of the present invention to improve a sieving machine of this kind especially for use with abrasives, maintaining at least the advantages already obtained in the prior art, in particular with regard to the separation effect and the sieving effect. It is to be possible to arrange the flexure spring exactly at the same height as the sieving fabric surface without reducing the output.

Means for Solving the Problem The solution to the problem is such that the rod has at both ends holding parts which reach upwards to the level of the sifting fabric surface to the side and beside the sifting fabric surface; It is characterized in that flexure springs, whose parts are held in the sieving box, are attached to these holding parts beside the sieving fabric surface and at the same height as this sieving fabric surface.

As a result, the tabs are oriented exactly at right angles to the sieving fabric surface and impinge on this sieving fabric surface, thereby completely avoiding transverse components that would promote damage to the sieving fabric surface.

For ease of manufacture, it is advantageous if the retainer and the deflection spring on the end of the rod are arranged inside the sieving box.

Furthermore, the vertical wall of the sifting box extends above the sifting fabric surface, faces in the same direction as the longitudinal edge of the sifting fabric surface, extends beyond the edge of the vertical side of the sifting fabric surface, and extends against the sifting fabric surface. It is advantageous if the sliding piece is provided with a slope. This prevents the bulk material from passing through the screening fabric surface without being sized.

Embodiments Examples of the invention are shown in the drawings and are explained in detail below.

The sifting machine, only partially shown in Figures 1 and 2, has a rectangular sifting box 1 to which a sifting fabric surface 2 of approximately the same area is attached in a replaceable manner. For this purpose, the short edge portion of this sieving fabric surface 2 is provided with a clamping mechanism (not shown) which extends parallel to the short sieving box surface.
In use, the screening box 1 and thus also the screening fabric surface 2 are arranged with an inclination to the left.

A sifted material inlet hopper can be provided above the upper right end of the sifting box 1, and a sifted material outlet (not shown) can be provided at the lower end of the sifted box 1 and below the sifted fabric surface 2. ing. In the sifting box 1, below the sifting fabric surface 2, it is oriented perpendicularly to the feed direction of the sifting material and to the longitudinal extension of the sifting box 1 and extends parallel to the sifting fabric surface 2. A plurality of rods 4 are supported. All bars 4 are fitted with a plurality of laterally supported shock levers 5 which are distributed over the entire length of these bars and which are arranged on the underside of the sifting fabric surface 2. It holds a protrusion piece 6 that can be touched. Each bar 4 is provided with a swinging lever 7 supported laterally,
This swing lever points downward. All the swing levers 7 of the rods 4 are pivotally connected to a common push rod 8. The push rod 8 is provided so as to extend along the sieving box 1. The end of the push rod on the inlet side of the sifted material is connected to a vibrating armature of an electromagnetic drive (not shown), which is preferably held in the sieving box and acts in the direction of the push rod 8. The frequency and/or amplitude of the oscillations can be selectively varied during operation by means of well-known electrical controls.

A bar 4 is in each case supported in the sieving box 1 in the region of both ends by an elongated steel flexure spring 101, which is provided along the plane of the sieving fabric and is arranged exactly at the same height as the plane of the sieving fabric. has been done. For this purpose, one end of the flexure spring 101 is attached to the screening box 1 and the other free end is attached to the holding part 105. Since these holding parts 105 reach upwards above the height of the sifting fabric surface 2, the flexure springs 101 can be arranged on these holding parts at the same height as the sifting fabric surface 2. Furthermore, a holding part 105 and a bending spring 101 are provided inside the screening box 1 and on the side and next to the screening fabric surface 2. The screening fabric surface 2 is therefore arranged at a distance from the vertical wall of the screening box 1.
In order to prevent the sifting material from passing through the sifting fabric surface without being sized between the longitudinal edge of the sifting fabric surface and the vertical wall of the sifting box 1, a A sliding piece 106 is provided which extends along and is inclined to the sieving fabric surface 2 and spans the gap between the vertical wall of the sieving box and the sieving fabric surface 2.

The holding portion 105 is configured as a square piece attached to the end surface of the rod 4. Other three-dimensional shapes of the holding part 105 are also possible, and these holding pieces can be formed integrally with the rod 4, for example.

A steel flexure spring 102 is provided for movably connecting the push rod 8 with the rocker lever 7 .
These flexure springs are arranged in the oscillating lever 7 so as to extend laterally and parallel to the push rod 8; It is provided to engage with. The end of the flexure spring 102 is attached to the push rod 8.

The sieving machine shown in FIGS. 3-4 corresponds substantially to the sieving machine according to FIGS. 1 and 2. However, in this case, two vibrators 10 are provided inside the sieving box 1,
Both of these vibrators act on the rod 4 via a push rod 8 in each case. The rod 4 has a square cross section and is fixedly connected to the percussion lever 5 at its end face. Attached to the upwardly oriented profiled legs of the bar 4 are in each case tabs 6, which tabs 6 are designed as strips with a U-shaped cross section.

The swing lever 7 is arranged diagonally downward and facing the supply direction. Attached to the free ends of these rocking levers are flexure springs 102 facing away from the feed direction, the free ends of which are connected to the push rod 8 . These push rods are arranged so as to extend close to the vertical wall of the sieving box 1 and below the sliding piece 106.

A flexure spring 1 oriented in the supply direction is attached to the impact lever 5
01 are attached, and the front ends of these bending springs are attached to holding parts 105, which are supported by the vertical walls of the sieving box 1.

A clamping device 3, which is fixedly held on a cradle, engages the laterally directed edge portion of the sieving fabric surface 2.

Further, guide pieces 103 for holding the push rod 8 are provided, and the upper ends of these guide pieces are attached to the sieving box 1.

In FIG. 4, a screening machine without a screening fabric surface 2 is shown.

The longitudinal edge portions of the sieving fabric surface 2 are surrounded by a sealing strip 107 extending in the longitudinal direction.

All new individual features and combinations of features disclosed in this specification and/or drawings are considered essential to the invention.

Additional Relationships The sifting machine according to Patent No. 1510147 (Japanese Patent Publication No. 63-56830) includes a sifting box having at least one sifting fabric surface inclined from a sifted material inlet to a sifted material outlet; This sieving fabric surface can be directly excited by a piece of protrusion that is provided under the sieving fabric surface and is distributed over its entire surface and that vibrates up and down. Via a plurality of impact levers located below the surface, the ends of each rod are supported on rods oriented at right angles to the feed direction of the sieved material, and the ends of the respective rods are moved along the surface of the sieved fabric. These rods are supported in the sieving box via longitudinal flexure springs placed approximately at the same height as the fabric surface, and these rods can be vibrated via a common push rod with oscillations of adjustable frequency and amplitude. It is.

According to the invention, a sieving machine of this type is improved especially for use with abrasive materials, maintaining at least the advantages already obtained in the prior art.
In order to be able to arrange the flexure springs exactly at the same height as the sieving fabric surface, in particular without separating effects and reducing the sieving power, rods are provided at both ends, lateral and lateral to the sieving fabric surface. Flexible springs, with one end held in the sifting box, have holders that extend upwards beside the sifting fabric surface to the same level as this sifting fabric surface. mounted at a height.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of the sieving machine, Figure 2 is a partial sectional view seen in the feeding direction of the sieved material, Figure 3 is a partial sectional view of another embodiment, and Figure 4 is a partially cutaway view. The plan view shown in Fig. 5 is - of Fig. 4.
It is a sectional view along a line. 1... Screening box, 2... Screening fabric surface, 4... Rod, 5... Impact lever, 6... Push piece, 7... Rocking lever, 8... Push rod, 10...
Vibrator, 101...bending spring, 105...holding section.

Claims (1)

[Claims] 1. A sifting box having at least one sifting fabric surface inclined from a sifting material inlet to a sifting material outlet; It can be directly excited by the protruding pieces distributed over the entire surface of the sieving fabric and vibrating up and down, and each of these protruding pieces can be excited via a plurality of impact levers provided under the surface of the sieving fabric. a vertically extending rod supported by rods oriented at right angles to the feed direction of the sifting material, each end of which is placed along the surface of the sifting fabric at approximately the same height as the surface of the sifting fabric. In a sieving machine, which is supported via a flexure spring on a sieving box, the bars of which are vibrated via a common push rod with vibrations whose frequency and amplitude are adjustable,
The rod 4 has at both ends retaining portions 105 which extend upwards to the level of the sieving fabric surface 2 on the sides and beside the sieving fabric surface 2, and at one end is a flexible tube held in the sieving box 1. Screening machine, characterized in that springs 101 are attached to these holding parts 105 beside the screening fabric surface 2 and at the same height as this screening fabric surface. 2. The sifting machine according to claim 1, wherein the holding part 105 and the bending spring 101 provided at the end of the rod 4 are arranged inside the sifting box 1. 3. A sifting box 1 is provided on its vertical wall, extending above the sifting fabric surface 2, oriented in the same direction as the longitudinal edges of the sifting fabric surface 2, and extending beyond the longitudinal edges of the sifting fabric surface 2. A sifting machine according to claim 1, characterized in that it has a sliding piece 106 that is inclined with respect to the sifting fabric surface 2.