JPS63171687A - Sieving machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The invention consists of a sieve device with at least one sieve fabric surface that can be directly and zone-wise excited, which sieve fabric surface is particularly suitable for sieving material@ This invention relates to a sieving machine that is arranged obliquely from an inlet to a sieved material outlet.

PRIOR ART J A sieving machine of this type is known from DE 31 34 116 A1.

However, this type of sieving machine, which has a relatively high efficiency due to the particularly large surface of the sieve fabric and therefore also allows large flow rates and direct excitation of the sieve fabric surface, has the following advantages: e.g. Sieve n
The disadvantage is that the openings on the fabric surface become increasingly closed, thereby reducing the initially relatively high flow rate.

In order to clean the fabric surface of the sieve, the above-mentioned German Patent No. 8 Maro proposes to intermittently excite the woven fabric surface of the sieve at a frequency higher than the sieve frequency.

Although this achieves the desired effect, experience has shown that these measures do not give satisfactory results, especially in the case of fine-grained, sticky sieve materials.

[The problem that the invention is trying to solve]

It is an object of the present invention to improve a sieving machine of the generic type to achieve almost any sieving of particles that are hitherto unobtainable, while still maintaining at least the conventionally high cleaning effectiveness and relatively high efficiency. The objective is to make sieving of cystic sieve material achievable.

Means for Solving the CI'Jf Point] The solution to this problem is that a plurality of compressed air nozzles directed toward the woven fabric surface of the sieve are arranged in a distributed manner under the sieve n fabric surface, and during the sieving process, a flow of compressed air is accessible to the sieve material at least once during the period of time, and the sieve fabric surface is arranged in a preferably at least substantially airtight housing;
In this housing, below the sieve fabric surface, a suction device is arranged which diverts the compressed air flow that has passed through the sieve fabric surface back into the housing space below this sieve fabric surface. It is a feature.

This has the advantage, on the one hand, that the mesh of the screen fabric can be kept open at all times by means of the compressed air jet. On the other hand, the sieve material on the sieve fabric side is loosened. At the same time, these sieve material particles are separated into sieve material B particles that adhere to each other, and then these sieve material particles are not separated as coarse materials as in the past, but as fine materials on the surface of the sieve n cloth. can pass.

Furthermore, the finest sieve material dust thrown up can be substantially forced through the sieve fabric surface by deflection of the compressed air flow and then separated separately from the finer sieve material.

Another arrangement is that the perforation strips are arranged below the sieve fabric surface, distributed over the surface of this sieve fabric surface, and in particular are oriented at right angles to the feed direction of the sieve material. Are these shock bodies provided? 17Jys bodies are held by striking levers, which are fixedly supported on a pedestal and are oriented at right angles to the feeding direction of the sieve material and are capable of reciprocating vibrations by motor drive. be.

At that time, what about the compressed air nozzle? It is particularly advantageous if it is arranged beside or close to the impacting body, thus in the area of the screen fabric surface that is directly excited by the impacting body.

A further arrangement which facilitates the feeding of the sieve material consists in that the compressed air nozzle is arranged at least approximately in the direction of discharge of the sieve material.

However, in order to achieve cleaning of the entire sieve and fabric surface with a relatively low outlay for compressed air nozzles, the compressed air nozzle is designed to be adjustable relative to the sieve fabric surface at least in the direction of the longitudinal extent of this sieve fabric surface. can do.

Furthermore, the compressed air nozzle is supported by at least one holder arranged parallel to the surface of the woven sieve fabric, and this holder is supported on a pedestal so as to be movable back and forth in the longitudinal range of the woven fabric surface of the sieve. It is advantageous if it is designed to be driven by a motor.

In this case, it is preferable that the holder is held on the pedestal by at least two connecting rods that are spaced apart from each other in front and behind the holder.

Furthermore, it is provided that a motor-driven actuating device with a linear displacement movement is provided, which actuating device is arranged in particular to act on the holding body via a push rod that engages all connecting rods. You can also do it.

A possible variant is that the housing space below the sieve fabric surface is penetrated by at least one suction tube extending in the longitudinal extent of the sieve fabric surface and having a suction opening, to which a vacuum generator is connected. This can be seen in the fact that a conduit connection is provided for this purpose.

In this case, it is advantageous if the suction tube has suction openings which are arranged only on the side of the suction tube opposite to the sieve fabric side and distributed over the entire area of the suction tube section below the housing. obtain.

Additionally, a dust filter can also be arranged between the suction tube and the vacuum generator.

In sieving machines with additional air nozzles below the sieve fabric, the variable height of the sieve space above the sieve fabric may be particularly important.

If the suction is constant and the inlet pressure of the dispersion nozzle is constant, a certain air velocity will occur within this volume. Depending on the arrangement of the external air supply (at the inlet or overflow), this air velocity, which provides a more or less strong transport aid for the sieve material in the sieve direction, can be increased by enlarging the sieve space or reducing the sieve space.

This variation can allow a considerable influence on the sieving results in relation to the sieving material (particularly for light or heavy products).

Another possibility of influencing the sieving results is obtained by limiting the discharge movement of the sieving material, possibly caused by air nozzles.

Depending on the height of the sieve space above the fabric, this ejecting movement ends in the confines (impingement), resulting in an additional deagglomeration effect. Particularly in the case of light products (for example silica materials), a reduction in the sieving space height prevents undesirable material floating conditions and only then can good sieving results be made possible.

〔Example〕

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

This sieving machine essentially comprises a sieving box 1 with an outlet 2 for fine sieving material, a rectangular sieving fabric surface 3 held in this sieving box 1 and longitudinally inclined towards the feed direction of the sieving material. The sieve chamber 1 is supplemented in a closed housing with a cap body 4 having a sieve material inlet 5 and an outlet 6 for coarse sieve material, which is arranged under the sieve cloth surface 3 and which has a sieve cloth. It includes a large number of impact bodies 7 that engage with the surface.

The percussion bodies 7, which are configured as percussion strips that preferably extend over approximately the entire width of the sieve fabric surface 3, are each held on percussion levers 8, which percussion levers are spaced one after the other in the feed direction of the sieve material. It tends to move away from the shaft 9 which is arranged and which extends at right angles to the longitudinal extent of the sieve fabric surface 3 and is supported on the sieve box 1.

Each shaft 9 is associated with an electromagnetic vibration drive 10 which is held on the outside of the first sieve.

Below the surface of the woven sieve fabric, compressed air pipes 11 are arranged beside each strip-shaped impact body 7 and extend parallel to the impact body 7; Like the impact body 7, it extends over almost the entire width of the screen fabric surface 3.

Each of these compressed air lines 11 has a number of compressed air nozzles 12 arranged one behind the other in the longitudinal extent of these air lines, these compressed air nozzles 12 facing towards the underside of the sieve fabric surface 3. is directed towards.

All lines 11 capable of receiving compressed air are held together in a holder 13 which extends parallel to the longitudinal extent of the screen surface 3 and which is identically constructed to one another. The connecting rods 14 are arranged and pivotally connected to a plurality of connecting rods 14, which are fixedly supported in the housing. All connecting rods 14 are connected by a companion push rod i5, which is a connecting device protruding from the sieve box 1 for a motor-driven operating device (not shown) with linear displacement movements. have.

Furthermore, the sieve box l is penetrated by a suction tube 16 arranged below the sieve fabric surface 3 at a distance from this sieve fabric surface, to which a vacuum generator, not shown, is associated. It is being

A large number of suction ports 17 are provided in the suction tube 16 and are distributed only on the inner surface of the suction tube. Suction tube 16
The end faces are preferably removably closed so that the suction line can pass through these end faces.

This type of sieving is suitable for separating grain sizes down to 2.

In the embodiment according to FIGS. 3 and 4, an intermediate wall 18 is additionally arranged, the height of which can be adjusted by means of an adjusting device 19, by means of which the air flowing in from the nozzle 12 has a raised space. can be changed and the emission width of the particles can be narrowed.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the sieving machine, Figure 2 is an enlarged view showing details of the sieving machine, Figure 3 is a cross-sectional view of a modification of Figure 1, and Figure 4 shows details of a modification of Figure 2. FIG. 3...Sieve fabric surface, 12...Compressed air nozzle, 1
6... Suction tube patent applicant Löwum Gesellschaft Mituto Beschrenchtel Huffing

Claims (1)

[Scope of Claims] 1 Consists of a sieve box with at least one sieve fabric surface that can be directly and zone-wise excited, the sieve fabric surface being arranged in particular with an inclination from the sieve material inlet to the sieve material outlet. In the sieving machine, the woven fabric surface of the sieve (
3), a plurality of compressed air nozzles (12) directed towards this screen fabric surface are arranged in a distributed manner so that the compressed air stream can reach the sieve material at least once during the sieving process; A sieve fabric surface (3) is disposed within the housing, in which the compressed air flow passing through the sieve fabric surface (3) is directed below the sieve fabric surface (3). A sieving machine, characterized in that a suction device (16) is arranged for deflecting it back into the housing space located in the sieving machine. 2 Below the sieve fabric surface (3), the percussion strips are arranged distributed over the surface of this sieve fabric surface and are in particular oriented at right angles to the feed direction of the sieve material. Impact bodies (7) are provided, these impact bodies impact the striking lever (8).
, and these striking levers tend to move away from a shaft (9) fixedly supported on a pedestal, oriented at right angles to the feeding direction of the sieve material, and capable of reciprocating vibrations by motor drive. A sieving machine according to claim 1. 3. A sieving machine according to claim 1 or 2, characterized in that the housing is constructed to be at least substantially airtight. 4. characterized in that the compressed air nozzle (12) is arranged beside or close to the impactor (7) and thus in the area of the screen fabric surface (3) that is directly excited by the impactor (7). A sieving machine according to any one of claims 1 to 3, wherein 5. Among the claims 1 to 4, the compressed air nozzle (12) is arranged with an opening at a minimum distance from the sieve fabric surface (3). The sieving machine described in 1. 6. Claims characterized in that the compressed air nozzles (12) are provided in a plurality of rows spaced one after the other in the feed direction of the sieve material and extending at right angles to the feed direction. The sieving machine according to one of paragraphs 1 to 5. 7. Claims 1 to 7, characterized in that the compressed air nozzle (12) is arranged with a slit-like nozzle opening extending over at least substantially the entire width of the screen fabric surface (3). A sieving machine as described in one of Section 6. 8 A row of compressed air nozzles (12) or one compressed air nozzle (12) beside each percussion strip or each row of impacting bodies (7) over almost the entire width of the screen fabric surface (3). 8. Screening machine according to claim 6, characterized in that it is arranged with an extending slit-like nozzle opening. 9. One of claims 1 to 8, characterized in that the compressed air nozzle (12) is held adjustable in its direction of action relative to the surface of the screen fabric.
The sieving machine described in . 10. Screening machine according to claim 1, characterized in that the compressed air nozzle (12) is arranged so as to point at least approximately in the direction of discharge of the screening material. 11. Claim 1, characterized in that the compressed air nozzle (12) is configured to be adjustable with respect to the sieve fabric surface (3) at least in the direction of the longitudinal extent of this sieve fabric surface. A sieving machine according to one of paragraphs 1 to 10. 12 The compressed air nozzle (12) is connected to the sieve fabric surface (3)
at least one holder (1
3), and the holding body (13) is supported on a frame so as to be movable back and forth in the vertical range of the sieve fabric surface (3), and is configured to be driven by a motor. The sieving machine according to item 11. 13. A patent characterized in that the holder (13) is held on the pedestal by at least two connecting rods (14) spaced apart from each other in front and behind the holder (13). A sieving machine according to claim 12. 14 A motor-driven operating device for linear displacement movement is provided, which operating device in particular connects all connecting rods (14).
14. Screening machine according to claim 13, characterized in that it is arranged to act on the holder (13) via a push rod (15) that engages with the holder (13). 15 The housing space below the sieve cloth surface (3) extends in the vertical range of the sieve cloth surface (3) and has a suction port (1
7) passing through at least one suction tube (16) with
Claim 1, characterized in that the suction tube is provided with a pipe connection part for connecting to a vacuum generator.
A sieving machine according to one of paragraphs 1 to 14. 16 The suction tube (16) is connected to the sieve fabric surface (
3) The suction ports (
17) The sieving machine according to claim 15, characterized in that it has: 17. The sieving machine according to claim 15 or 16, characterized in that a dust filter is arranged between the suction pipe and the vacuum generator. 18 an intermediate wall (18) held adjustably above the sieve fabric surface (3) and spaced from the sieve fabric surface;
A sieving machine according to one of claims 1 to 17, characterized in that a sieving machine is provided.