JPS61181578A - Method and device for cleaning cloth for sieve - 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 Technical Field of the Invention The present invention relates to a method and apparatus for cleaning sieve cloth. More specifically, the present invention provides for holding a sieve cloth between tension members and at least one tension device coupled to at least one of the tension members to control the direction of flow of the material on the sieve cloth. The present invention relates to a method and apparatus for cleaning a sieve cloth of a machine, and a vibrating multi-deck type sieve configured to pull a sieve cloth.

PRIOR ART When sticky materials are forced through a vibrating screen, there is often a tendency for the material to stick to the screen cloth, and it is often difficult to prevent the resulting clogging. The problem becomes even more acute when the material contains particles that have approximately the same dimensions as the mesh of the sieve cloth and can thus be forced into the mesh.

Due to the above-mentioned two types of clogging of the sieve cloth, the surface of the sieve material is reduced, so that the ability of the sieve material is more or less rapidly reduced.

In order to remove particles clogging the mesh, methods have already been proposed in which a vibrating device or a percussion device is applied to the sieve cloth to force the pressed particles out of the mesh. However, against clogging caused by sticky materials or granular sticky materials,
Vibratory or percussion devices were not at all efficient. In such cases, conventionally, it has been necessary to occasionally stop the operation of the sieving apparatus and thoroughly clean the sieving cloth. Such operations are already industrially unacceptable, since sieving results in machine downtime and reduced production.

Another device is disclosed in U.S. Pat. No. 3,655,045 which is capable of relaxing a sieve cloth in a direction perpendicular to the flow direction of the material on the sieve cloth. However, this device has
Since the waves of agitation of the sieve cloth are oriented in the direction of material flow, material accumulates in wave troughs or nodes of agitation. the result,
Sieving results in the problem that the material flows apart, rather than the uniform distribution of the material over the entire surface of the sieving cloth, which is desirable and important for the process.

The material load on the sieve cloth is greatest in its first part,
Additionally, it is important to concentrate the agitation in this area since two types of clogging often occur in this area. This is possible with a transverse tensioning device, but conversely, a greater load on the first part of the sieve cloth
The oscillating motion will be more limited than in the second portion, which has a lower load.

OBJECTS OF THE INVENTION The present invention overcomes the drawbacks of the conventional sieve cloth cleaning method and apparatus, and sieves can be cleaned during continuous operation of the machine, that is, without substantially stopping production. It is an object of the present invention to provide a method for cleaning a sieve cloth and an apparatus therefor that can perform sufficient cleaning.

invention! According to the present invention, the sieving is carried out during continuous vibration of the machine until the particles stuck to the sieve cloth or pushed into the mesh are removed by the movement of the sieve cloth. is relaxed longitudinally and then the sieve cloth is pulled again. This process of relaxing and tensioning the sieving cloth may be repeated. Furthermore, the appropriate time interval is automatically set by the timing device. Therefore, the degree of relaxation of the sieve cloth can be set, adjusted and repeated, and is further adjustable, preferably between 2 and 8III111, depending on the type, frequency and amplitude of the sieve cloth. Must.

The loosening of the sieve cloth causes an oscillating movement of the sieve cloth. The sieve cloth is strongly vibrated by the shaking motion, and the clogging particles are removed from the sieve cloth. As a result, the sieve cloth becomes
The largest sieve fraction maintains its capacity because it is kept at optimum cleanliness.

The device for carrying out the method according to the invention is provided with a tensioning device comprising a pneumatic cylinder, which engages the tensioning element of the sieve fabric and is connected in a known manner to a source of compressed air. It is also possible to connect the tension member of the sieve cloth to the frame of the device by means of a tension spring, and furthermore to effect the relaxation of the sieve cloth by means of an electromagnetic device. It is suitable to connect the tensioning device to the tensioning element of the sieve cloth via a guide by means of a flexible joint, for example a hinge, a false spring or the like.

It has been found to be desirable to arrange a cover plate or deflection plate for the material above the tensioning member and tensioning device. In order to increase the cleaning effect, the sieve cloth may be provided with support elements or impact elements.

EXAMPLES Below, the structure of the present invention will be explained for each example according to the attached drawings.

In the drawing, one end of the sieve cloth lO is a fixed tension member 11
It is attached to. The other end of the sieve cloth lO is connected to a movable tension member 12. In the cleaning device according to the first embodiment of the invention shown in FIGS. 1 to 3, the movable tensioning member 12 is connected to a tensioning device 14 via a guide 21. In the cleaning device according to the first embodiment of the invention shown in FIGS.

The tensioning device 14 is fixed to the frame of the machine 13 and comprises, for example, a pneumatic cylinder for air or bending. When the air pressure increases, the piston of the cylinder moves to the right in the direction of the arrow and pulls the sieve cloth 10. When the air pressure decreases, the piston moves to the left in the direction of the arrow, causing the sieve cloth 10 to relax. It is also possible to provide the tensioning device in the opposite direction so that it relaxes the sieve cloth at high pressures and tensions it at low pressures. The pneumatic medium is introduced into the tensioning device 14 via a conduit 18 . FIG. 1 shows a configuration in which a sieving device 20 equipped with a vibrating device 19 is provided with a tensioning device 14 on three sieve cloths 1O.

In the cleaning device according to the second embodiment of the present invention shown in FIG. 4, the sieving cloth 10 is pulled by a movable tension member 12 attached to the frame of the sieving jfA 13 by a tension spring 15. In this case, the relaxation of the sieve cloth lO is caused by the electromagnet 16 to move the movable tension member 1 to the left in the direction of the arrow.
2 is pulled. When the electromagnet 13 is switched off, the tension spring 15 tensions the sieve cloth lO again.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a multi-deck sieving machine equipped with a cleaning device according to a first embodiment of the present invention, and FIG. 2 is a side view of the tension device and sieve cloth of the cleaning device of FIG. 1. , 3rd
The figure is a plan view of the tensioning device and sieve cloth in Figure 2, and the fourth
The figure shows the second embodiment of the present invention? FIG. 3 is a plan view of the tension device and sieve cloth of the fi purification device. 10... Sieve cloth, 11... Fixed tension member, 1
2... Movable tension member, 13... Sieving machine, 1
4... Tension device, 15... Tension spring, 16
...Electromagnet, 19...Vibration device. Patent applicant Hretrik Mogensen Aktivoraget, patent attorney Aoyama Aoyama, and 2 other people Drawing page 1,
(No change to 5) Fig, 3 Fig, 4 Procedural amendment Shima type) % type % 1. Indication of the case Patent application No. 249919 of 1985 2) Name of the invention Method and device for cleaning sieve cloth 3. Relationship with the case of the person making the amendment Patent applicant IL Office Sweden Nis-54400 Ho Yui Oh. B.O. Box 78 Name: Fredrink Mordensen Aktivoradet Nationality: Sweden 4 Agent Address: 3 Kokugi Building, 2-10 Honmachi, Higashi-ku, Osaka City, Osaka Prefecture,
Complete drawings. 7. Contents of amendment (1) Regarding the column of the patent applicant in the application and the document certifying the right of representation, the need for amendment has already been resolved by the procedural amendment (voluntary) dated December 25, 1985. We are aware of this, so we kindly ask you to investigate this matter.

Claims (10)

[Claims] (1) The sieve cloth is held between tension members, and
A sieve cloth attached to a multi-deck sieving machine equipped with a vibration mechanism configured to pull the sieve cloth in the flow direction of the material on the sieve cloth by a tension device connected to at least one of the tension members. In the cleaning method, during continuous operation of the sieving machine, the tension in the longitudinal direction of the sieve cloth is reduced and the sieve cloth is agitated, thereby preventing the sieving cloth from sticking to the mesh or causing the mesh of the sieving cloth to become loose. A cleaning method comprising a step of relaxing a sieve cloth for at least partially removing particles pushed into the sieve cloth, and a step of tensioning the sieve cloth for pulling the sieve cloth. (2) The cleaning method described in claim 1, characterized in that a relaxing step and a tensioning step are repeated. (3) The cleaning method according to claim 1 or 2, characterized in that the relaxing step and the tensioning step are automatically controlled by a timing device. (4) The cleaning method according to any one of claims 1 to 3, characterized in that the degree to which the sieve cloth is relaxed is set and can be repeated and adjusted. (5) In the cleaning method described in claim 4, the degree to which the sieve cloth is relaxed can be adjusted between about 2 and 8 mm depending on the type, frequency and amplitude of the sieve cloth. characterized by. (6) Multi-deck sieving machine equipped with a vibration mechanism (13
), the tension member (11, 12) that holds the sieve cloth (10) between them.
and at least one (12) of the tension members (11, 12).
), and the tensioning device (14) pulls the sieve cloth (10) in the flow direction of the material on the sieve cloth (10);
4) A cleaning device comprising a pneumatic cylinder. (7) Multi-deck sieving machine equipped with a vibration mechanism (13
), the tension member (11, 12) that holds the sieve cloth (10) between them.
and at least one (12) of the tension members (11, 12).
), a tensioning device (14) connected to the tensioning spring (1
5) and at least one electromagnetic device (16) and pulling the sieve cloth (10) in the flow direction of the material on the sieve cloth (10) by means of a tensioning device (14); (14) is equipped with a pneumatic cylinder, and one of the above (
12) tensile members (11, 12) into a sieving machine (13)
A cleaning device characterized in that an electromagnetic device (16) or a pneumatic cylinder relaxes the sieve cloth by being connected to the frame of the machine by means of a tension spring (15). (8) The cleaning device according to claim 6 or 7, further comprising one of the tension members (12) (
11, 12) and the tension device (14) are provided with a joint that elastically connects them. (9) In the cleaning device according to any one of claims 6 to 8, the tension member (11, 12) of one of the above (12) and the tension device (14, 16) are further provided.
characterized in that at least one cover plate or deflection plate is provided above the. (10) The cleaning device according to any one of claims 6 to 9, further comprising a support member or a striking member against which the sieve cloth (10) comes into contact.