ES2200752T3 - AIR JET SCREEN FOR GRANULOMETRIC ANALYSIS AND CORRESPONDING FABRIC INSERT. - Google Patents

Abstract

The filter has a housing, a filter insert selected from a number with different mesh pitches, a slot nozzle beneath the filt bottom, a drive for the slot nozzle, an air feed to the nozzle, an air outlet via the housing from the chamber beneath the filte bottom and a controller. The filter machine has a sensor (2) for automatic identification of the inserted filter (4) using codin the insert. The coding can be stored on a writable memory medium. An Independent claim is also included for a filter insert.

Description

Air jet sieve for analysis granulometric and corresponding screen tissue insert.

The invention relates to a jet sieve of air according to the preamble of claim 1, as well as a tissue insert for air jet screening.

In the granulometric analysis by means of a air jet screening machine according to the state of the art (for example, according to DE4419153A1), the material for sieve is deposited on the sieve tissue insert, a blow is blown gas stream from bottom to top through tissue insert sieve using a slotted nozzle, which rotates below the insert of sieve tissue, and the screening material swirls That is about the sieve. The fine components of the material for sieve are dragged by the jet of gas, transported to through the insert of sieve tissue from top to bottom to the chamber below the sieve tissue insert and from there it extracted from the sieve machine. The thick components that are greater than the mesh opening of the screen tissue insert corresponding, they cannot pass through the sieve and remain on the sieve tissue after screening.

The document GB-A-2321528 describes a sensor in a screening machine, which is used to read a barcode located in the screen, thus being able to centrally control the machine of screening identify the screen and knowing in this way what screen It weighs at that time. This procedure avoids errors due to double weighing of the same screen.

The Abstracts of Japan patent, vol. 07, No. 366 (P-1571) & JP05054042A describes a procedure and a device for automatic inspection of powder-shaped items using a scale and at least one barcode reader

To determine a distribution curve granulometric, you have to perform several screens with different sieves with different mesh openings. To this end, the thick components, which remained in the screen after the first screening, they are subjected to subsequent screening. The sieve, used in first, with a first mesh opening it is removed from the air jet screening machine and a second sieve is placed with a larger mesh opening. The residue of the first screening is feeds the second screen and a second screen is made. The screening residue, which remains from the second screening, is fed to continuation to a third screening. Depending on the need, many screening can be done in the granulometric steps desired in each case through the different screens with different mesh openings After each screening done, you have to weigh the screening residue to determine the curve of granulometric distribution.

To facilitate the necessary determination repeated screening residue through screening and weighing, developed according to the state of the art according to the document DE4419153A1, an air jet screening machine that enables an automated weighing independent of the screening residue. With this purpose was integrated into the air jet screening machine a scale that after each screening process raises the screen with the screening residue and weighs them. Through the comparison of This weighing result with the weight of the empty sieve, can be Determine the amount of screening residue. However, in this sieve machine can only determine the weight of the sieve and not reliable conclusions about other characteristics can be drawn of the sieve tissue insert.

In order to obtain correct results that provide information for the determination of the distribution curve granulometric, it is very necessary that all parameters be reliably comply with the specification of testing. However, manual operation of the screening machine by air jet and, especially, the manual replacement of sieve tissue inserts contain the danger of confusing involuntarily the sieve tissue inserts, for example, in As for the necessary mesh opening. Therefore, it turns out a secure monitoring of the means of verification is necessary, which so far is exclusively borne by the operator of The air jet screening machine.

To generally increase the security of analysis of analytical screening machines against an operation wrong, according to the invention the possibility of a automatic recognition of different parameters of the insert sieve fabric Especially, the screening machine must recognize Automatically opening mesh screen insert fabric used.

This objective is achieved according to the invention. by means of the air jet sieve according to claim 1 and the sieve tissue insert according to claims 4 and 9.

Advantageous configurations of the invention are the Subject of the corresponding secondary claims.

An automatic tissue insert comparison sieve, used in each case, with the value of the mesh opening of the necessary screening tissue insert, performed in a corresponding control device, guarantees the use of the correct screen tissue insert. If the operator has selected by mistake a wrong screen tissue insert, this error it is indicated by the corresponding signals on the machine screen and you are asked to place the correct screen tissue insert in the sieve machine. The information obtained on the insert of identified screen tissue, can be saved, by example, for its protocolization in a memory device and they can incorporate into a later evaluation, for example, in a electronic processor

In order to automatically recognize the criteria more important, that is, the mesh opening of each insert of sieve fabric, each sieve carries a signature on the chassis, which it is machine readable and from which you can know at least the nominal mesh opening. In the machine-readable signature Other specific data or information can also be stored of the sieve. A sensor is placed in the screening machine that can Read the signature. The data and information read by the sensor can continue processing in an evaluation unit and On the basis of this information, the corresponding actions. In this way, if a screen is detected wrong using the sensor and the evaluation unit, you can generate a signal that indicates confusion regarding the sieve.

In addition to the nominal mesh opening, You can also store other specific screen data in the signature of the sieve chassis, for example, the manufacturer, the production date, the shape of the mesh and / or the DIN number of the sieve, as well as, for example, cleaning intervals, for purposes of control.

In an advantageous configuration of the invention, the machine-readable signature of the sieve chassis is made of so that it is not only readable by the sensor, but also You can write and / or overwrite. They can be stored like this additional information in the signature of the sieve chassis and You can call again later. You can try, for example, to the number of times it has been used, performing processes of cleaning and / or control or the date of the last use of the sieve. All This information is stored in the tissue insert correspondent.

In a variation of the screen according to the invention, with machine-readable signature, the screen is identified only by a serial number The tissue insert evaluation of Screening is done based on the serial number with respect to all the relevant data, such as the mesh opening, in a separate unit, for example, in a control of microcontroller and / or a database. Each serial number is assign specific data sets (mesh opening, amount of times it has been used, date of use, manufacturer data, form of the mesh, etc.), which are physically recorded and stored separately of the sieve tissue insert.

The practical realization of the readable signature by machine it is possible in several ways depending on the current state of The technique. Functionally, you can differentiate here between Overwritten, non-overwritten and partially signatures Overwriteable Depending on the case of application and the individual needs, you can select the best solution in each case.

The currently acceptable cost of signatures machine readable and / or writable, which can be done from The economic point of view is described below.

Barcode

On the outer side of the sieve chassis is find horizontal stripes that are arranged on a part or the entire circumference of the sieve chassis and that stand out clearly and contrast with the sieve chassis. Barcodes they can also be printed on a sticker that sticks on the external side of the sieve chassis. When the tissue insert of sieve is introduced into the sieve machine, a sensor (laser), which It is placed in the internal circumference of the housing in the form of Sieve machine key, contactless touch code bars.

Spike code

On the outer side of the sieve chassis or on the lower side of the neck are placed several spikes. One of the ears differ from the others by their diameter or their length and set the correct position for decoding. Each spike penetrates a hole in the screen of the sieve machine when The sieve tissue insert is placed in the machine. In each drill a sensor checks if a spike is present. The existence or not of different spikes allows the preparation of a code that the sensors can read on the housing.

Answering chip

A small chip in a glass housing is fixed at one point of the sieve chassis. The chip can store and issue specific information by radio transmission without energy auxiliary, in case of irradiation and by means of a writing device and reading.

Magnetic stripe

On the outer side of the sieve chassis is placed in its circumference a magnetic band that can be read and write using a reading and writing device, located in the screening machine housing. In an economic configuration, the Magnetic band is placed on a card. The card is fixed to insert of sieve tissue by means of a chain or a cord. The card with magnetic stripe contains the individual information of the sieve tissue insert, to which it has been fixed. For him screening the magnetic card must be inserted into a device reading located on the sieve machine, only then can the screening process

Chip card

Similar to the card application with magnetic stripe, cards with a chip can also be used integrated. However, the reading and writing of the card is not performs magnetically, but electronically.

The invention is described below by drawings. They show:

Fig. 1 an overview of a screening machine according to the invention;

Fig. 2 an enlarged partial section of the machine screen according to the invention;

Fig. 3 a screening machine according to the invention with integrated scale;

Fig. 4 a configuration with magnetic card and card reader.

The air jet screen according to figure 1 it presents an insert 4 of sieve tissue, introduced in the Case. The insert 4 of sieve tissue disposes in its outer circumference an encoding 1. Coding 1 can be, for example, a bar code or a pin code. How alternatively, encoding 1 can be registered in a memory writable 5. Writeable memory replaces coding here 1 and is located in the same place of tissue insert 4 screen.

Sensor 2, located in the housing, is located in active union with encoding 1 or writable memory 5, when insert 4 of screen tissue is placed in the housing of the air jet sieve. Registration and Processing further signal, read by encoding 1 or memory writable 5, are performed on a control device 3 that generates the desired and predefined actions based on the signal read in each case.

The partial cut, represented in Figure 2, shows encoding 1 or writable memory 5 along with the sensor 2 and the control device 3 in a representation expanded.

In figure 3, sensor 2 has been replaced by a scale 7 that identifies the sieve introduced 4 by its weight. Through the weight of the screen, the control device 3 can identify the specific characteristics of tissue insert 4 of sieve mounted.

Figure 4 shows a representation Schematic of the screening machine, where tissue insert 4 Screen is marked by a magnetic card or card of chip 6 and a card reader 2 can identify the insert 4 of  sieve fabric when the magnetic card or card is inserted of chip 6 in a slot located in the casing of the machine screen and where the control device 3 can continue processing The insert

Claims (9)

1. Screen by air jet with a housing, an insert (4) of screening fabric, selected from a plurality of test screens with different mesh openings and which can be inserted into the housing, with a slotted nozzle below the bottom of the insert (4) of screening fabric, a drive for the slotted nozzle, an air inlet to the slotted nozzle and an air outlet through the housing from the chamber below the bottom of the fabric insert (4) of sieve and a control device for operation, characterized in that a sensor (2) is provided, with which the insert (4) of sieve tissue introduced by means of an encoding (1) arranged therein can be automatically identified, where The coding (1) can store information about the mesh opening and / or the number of times the screen has been used and / or the date of the last use of the screen and / or the manufacturer and / or the production date and / or the shape of the mesh and / or the number ro DIN of the insert (4) of screening fabric. 2. Air jet sieve according to claim 1, characterized in that the sensor (2) is a scale (7), by which the insert (4) of sieve tissue can be identified by its weight. 3. Air jet screening according to one of the preceding claims, characterized by a control device (3) for the further processing of the information from the coding (1) and / or the weight, as well as by the generation of predefined actions for this. 4. Screen tissue insert for an air jet screen according to one of the preceding claims, characterized in that the coding (1), located in the screen fabric insert (4), is a bar code or a code of spike. 5. Screen tissue insert for an air jet screen according to claim 4, characterized in that the coding (1) can be stored in a writable memory (5). 6. Screen tissue insert according to claim 5, characterized in that the writable memory (5) is a magnetic strip or a microchip located in the screen fabric insert (4). 7. Screen tissue insert according to claim 6, characterized in that the coding (1) can be stored in a code card (6) attached to the screen tissue insert (4). 8. Screen tissue insert according to claim 7, characterized in that the code card (6) is a magnetic card or a chip card. 9. Screen tissue insert for an air jet screen according to one of claims 1 to 3, characterized in that information on the mesh opening and / or the number of times it has been stored can be stored in the coding (1) used the sieve and / or the date of the last use and / or the manufacturer and / or the production date and / or the shape of the mesh and / or the DIN number of the insert (4) of sieve fabric and can be stored the DIN number of the insert (4) and / or the performance of cleaning and control processes and / or the serial number and / or other data of the manufacturer.