EP1171284B1 - Method for briquetting metal chips and briquetting press - Google Patents

Abstract

A method and a briquetting press for briquetting metal chips, wherein stable briquettes/pressed component are produced. The actual length (L<SUB>act</SUB>) of the pressed component is obtained by applying pressure (P<SUB>max</SUB>/P<SUB>req</SUB>) using at least one pressing ram ( 1, 2 ) and measuring the length with a measuring device ( 5, 6 ). The measured value is compared to a desired nominal value (L<SUB>nom</SUB>) and a difference value (□) is subsequently determined.

Description

Technical field

The invention relates to a method for briquetting metal chips and a Briquetting press to carry out the process.

State of the art

• Stampfer vorfahren, Füllen und Verschließen der Preßbuchse,
• Preßstempel vorfahren und Förderung der Metallspäne in den Preßabschnitt der Preßbuchse,
• Druckbeaufschlagung der Metallspäne durch mindestens einen Preßstempel bis zur Erreichung des Enddruckes P_max bzw. erforderlichen Druckes P_erf,
• ggf. Zurückfahren eines zweiten Preßstempels und Ausstoßen des fertigen Preßlings als Brikett durch den ersten Preßstempel und
• ersten Preßstempel zurückfahren und ggf. zweiten Preßstempel vorfahren in die Ausgangsposition.

Briquetting presses according to DE-A-40 39 788 have already become known in which the metal chips are pressed into briquettes by means of at least one press ram in a press bush, to which the metal chips are fed via a metering device assigned to the press bush with a tamper. The procedure is as follows:

• Drive the rammer forward, fill and close the press bushing,
• Move the ram up and convey the metal chips into the press section of the press bush,
• Pressurization of the metal chips by at least one press ram until the final pressure P _max or the required pressure P _{erf is reached} ,
• if necessary retracting a second ram and ejecting the finished compact as a briquette through the first ram and
• Retract the first ram and, if necessary, advance the second ram to the starting position.

Compared to conventional briquetting presses, the possibly double-acting briquetting presses on the one hand produces a compact which has a particularly high compression, that of the actual metal density comes close and on the other hand achieves a high power throughput, so that a Optimal between high density and high performance is achieved. Compared to the single-sided presses can also have longer briquettes be produced because the theoretically still feasible stroke lengths are practical mechanical engineering and manufacturing must be kept limited.

Furthermore, according to EP-A-0 367 859 a method and a Briquetting press for the production of dimensionally stable briquettes from chip, fibrous, dusty or sheet-like pressed material is known, after which the pressed material first fed to a pre-compression piston and from this in a Receiving chamber is pre-compressed and at right angles to it moving plunger is further compressed in a molding box.

This invention provides that the exact detection of End position of the plunger or pre-compressor piston the fluctuations compensate almost completely in the pressed material and at the same time the intended one Let the drive power of the press be used with high efficiency.

The knowledge gained from this technical teaching, however, is based on axial Non-transferable towards double-acting briquetting presses.

Furthermore, US-A-5,326,511 teaches one similar to the aforementioned document Solution, being in the synopsis of the characteristics of this genus of Presses arranged on the principle of perpendicular to each other Pre-compressors and final compressors work, there are no solutions for that in a press bushing against each other, a completely represent another type of press with other functional processes.

With a double-acting briquetting press with those working in a press bush Rather, it is problematic to stamp the possible and permissible length of the To achieve compacts for briquette with extremely low tolerance. Then it is disadvantageous that, although the maximum pressure acts, the maximum possible Filling volume in the press bushing cannot be used with regard to the length of the briquette is.

Presentation of the invention

The invention is based on the object, while maintaining the initially advantageous functional sequence described above, of specifying a method in which a higher mass throughput of metal chips to be pressed is possible by utilizing the achievable desired length of the briquette by means of improved metering of the metal chips for a maximum filling volume in the press bushing.
Furthermore, there is the task of equipping a briquetting press for carrying out the method with suitable technical means which bring about an improved metering of the metal chips.

Overall, the invention aims to produce stable briquettes.

The invention is intended to relate exclusively to the type of press refer to only one press bush with opening for the radially assigned Dosing device with tamper, which is also a closing device for the opening is in the press bush, two guided in this press bush Press ram with piston rods and one of these assemblies and associated Have the frame, frame or housing that receives the pressure generator.

According to the invention, the object is achieved according to the method by the features according to claims 1 to 6 solved. To carry out the process, a Briquetting press proposed according to the features of claim 7.

Brief description of the drawings

Fig. 1

das Erfindungsprinzip, dargestellt an dem Schema einer doppelt wirkenden Brikettierpresse mit Regelkreis und

Fig. 2

ein Regelkreisschema gemäß Fig. 1.

Show in the drawings

Fig. 1

the principle of the invention, illustrated on the scheme of a double-acting briquetting press with control circuit and

Fig. 2

2 shows a control circuit diagram according to FIG. 1.

Best way to carry out the invention

According to an exemplary embodiment, FIG. 1 shows a schematic illustration a double-acting briquetting press, each with two rams 1, 2, piston rods 3, 4 and measuring devices 5, 6, but the invention is also based on single-acting, i.e. equipped with a press ram, a piston rod and a measuring device Briquetting presses applicable. The briquetting press is a dosing device Upstream 9, of which the metal chips by means of a rammer 8 a press bush 11 are supplied, in which, through the interaction of the press rams 1, 2 the compact 12 is formed as a briquette.

A control circuit 15 belonging to the briquetting press consists of the measuring devices 5, 6, a logic module 7, a controller 13 and actuators 10, 17 (Fig. 2).

According to FIG. 2, the schematically represented functions of compact density 16.1, Press length 16.2, press pressure 16.3 and supply quantity 17.1 and press pressure 17.2 regulated.

• Stampfer 9 vorfahren, Füllen der Preßbuchse 11 mit Metallspänen über die radial zugeordnete Dosiereinrichtung 9 und Verschließen der Preßbuchse 11,
• Preßstempel 1, 2 vorfahren und Förderung der Metallspäne in den Preßabschnitt der Preßbuchse,
• Druckbeaufschlagung der Metallspäne durch die Preßstempel 1, 2 gemeinsam bis zur Erreichung des Enddruckes P_max bzw. erforderlichen Druckes P_erf,
• Zurückfahren der Preßstempel 1, 2 und Ausstoßen des fertigen Preßlings 12

hergestellt.By applying pressure by means of the press rams 1, 2 in the press bush 11, the compact 12 becomes after the process

• Advance the tamper 9, fill the press bush 11 with metal chips via the radially assigned metering device 9 and close the press bush 11,
• Move the ram 1, 2 forward and convey the metal chips into the press section of the press bush,
• Pressurization of the metal chips by the press rams 1, 2 together until the final pressure P _max or the required pressure P _{erf is reached} ,
• Retracting the press rams 1, 2 and ejecting the finished compact 12

produced.

According to the invention, when the pressure is applied P _max / P _erf by the press rams 1, 2, the compact length L achieved _is measured by means of the measuring devices 5, 6 integrated on the piston rods 5, 6, this measured value _is compared with a target value L target and then a difference value Δ certainly. In accordance with this difference value, the amount or mass of the metal chips to be fed from the metering device 9 is defined according to the desired length L target of the compact 12 _, the fill level is then set in the metering device 9 and the corresponding amount or mass is supplied by the tamper 9. This process can be repeated until the final pressure P _max or the required pressure P _erf and the target value L _{should have reached} the length of the briquette or compact 12.

a) bei der Feststellung, daß die Brikettlänge L_ist unterhalb des Sollwertes L_soll liegt, einen Befehl zur Mehrdosierung oder

b) bei der Feststellung, daß die Brikettlänge L_ist über dem Sollwert L_soll liegt, einen Befehl zur Minderdosierung

von Metallspänen in der Dosiereinrichtung 9 auslöst.To determine the briquette length from the relative position of the press rams 1, 2 by means of the integrated measuring devices 5, 6, an electronic logic module 7 is used, which according to the relationship L _soll = S ₁ - S ₂

a) when determining that the briquette L _is below the set point L is located _to a command for multi-dose or

b) _to when determining that the briquette L _is above the reference value L, a command for reducing dosage

of metal chips in the metering device 9.

Industrial applicability

It has been found in tests with an inventive design of this type Briquetting press shown that the intended task can be solved and the Invention is useful.

Claims (8)

1. A method for briquetting metal chips in a briquetting press by pressurisation of the pressed article (12) by means of at least one press ram (1, 2) in a press bush (11), to which the metal chips are fed via a metering device (9) assigned radially to the press bush (11) using a stamper (8), comprising the following sequence of procedural steps:

   advancing the stamper (9), filling and closing the press bush (11),

   advancing the press ram (1, 2) and feeding the metal chips into the press section of the press bush (11),

   pressurisation of the metal chips by at least one press ram (1, 2) until the pressurisation P_max or required pressure P_erf is reached,

   retracting at least one press ram and ejecting the finished pressed article as a briquette and retract the press ram into the starting position,

   characterised in that

   a) during pressurisation P_max/P_erf by the press ram (1, 2) the resulting pressed article length (L_actual) is measured by means of a measuring device (5, 6), this measured value is compared to a nominal value (L_nominal) and then a differential value (Δ) is determined, and

   b) according to this differential value (Δ) the quantity/mass of the metal chips to be fed from the metering device (9) is determined according to the nominal length (L_nominal) of the pressed article (12), after which the filling mass in the metering device (9) is adjusted and the corresponding quantity/mass is supplied by the stamper (8).
2. The method as claimed in Claim 1, characterised in that according to at least one renewed methodological step sequence the nominal value (L_nominal) of the length of the briquette is reached during pressurisation of the metal chips by the press ram (1, 2) until the pressurisation P_max or required pressure P_erf is reached.
3. The method as claimed in any one of Claims 1 or 2, characterised by the use of an integrated measuring device (5, 6) for fixing and/or adjusting the briquette length (L_actual or L_nominal).
4. The method as claimed in Claim 3, characterised by the use of a measuring device (5, 6) integrated on a piston rod (4, 5) of the press ram (1, 2).
5. The method as claimed in Claim 3 or 4, characterised by the use of an electronic logic module for determining the briquette length from the relative positioning of the press ram (1, 2) by means of the integrated measuring device (5, 6) according to the equation (L_nominal/_actual = S₁ - S₂).
6. The method as claimed in any one of Claims 1 to 5, characterised by the use of an electronic logic module which, according to the equation L_nominal = S₁ - S₂,

   a) according to the observation that the briquette length L_actual is under the nominal value L_nominal, triggers a command for increased metering, or

   b) according to the observation that the briquette length L_actual is above the nominal value L_nominal, triggers a command for reduced metering

   of metal chips in the metering device (9).
7. The method as claimed in any one of Claims 1 to 6, characterised by the use of an electronic regulator circuit (15) with actuators (10, 17.1, 17.2) for adjusting the method-specific processing data such as

   metering quantity (17.1),

   density of the pressed article (16.1),

   length of the pressed article (16.2) or

   pressing powers (16.3, 17.2).
8. A briquetting press for carrying the method into effect, as claimed in any one of Claims 1 to 7, essentially comprising the assemblies making up the operating sequences of the machine, such as

   press bush (11) with opening for the radially assigned metering device (9) with stamper (8), which at the same time is a closing element for the opening in the press bush (11),

   two press rams (1, 2) guided in the press bush (11) with piston rod (3, 4), and

   a stand, frame or housing accommodating these assemblies as well as associated pressurisers,

   characterised in that

   a) the piston rods (3, 4) of the press ram (1, 2) house at least one measuring device (5, 6),

   b) between the measuring device (5, 6) and the metering device a regulator circuit (15) is provided for influencing the metering of metal chips depending on the briquette lengths (L_nominal/ _actual) recorded by the measuring device (5, 6) and

   c) the regulator circuit (15) has actuators (10, 17) and a logic module (7) for controlling the processing sequence in the relationship between briquette length and metering quantity/mass.

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