EP0567606B1 - Procede de commande et/ou de reglage du processus de moulage d'une machine a blocs - Google Patents

Procede de commande et/ou de reglage du processus de moulage d'une machine a blocs Download PDF

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Publication number
EP0567606B1
EP0567606B1 EP92920609A EP92920609A EP0567606B1 EP 0567606 B1 EP0567606 B1 EP 0567606B1 EP 92920609 A EP92920609 A EP 92920609A EP 92920609 A EP92920609 A EP 92920609A EP 0567606 B1 EP0567606 B1 EP 0567606B1
Authority
EP
European Patent Office
Prior art keywords
moulding
pressing
pressure
press
pressing process
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92920609A
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German (de)
English (en)
Other versions
EP0567606A1 (fr
Inventor
Hans Ulrich Hauser
Hans Joachim Zenner
Martin Mick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Laeis Bucher GmbH
Original Assignee
Laeis Bucher GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Laeis Bucher GmbH filed Critical Laeis Bucher GmbH
Publication of EP0567606A1 publication Critical patent/EP0567606A1/fr
Application granted granted Critical
Publication of EP0567606B1 publication Critical patent/EP0567606B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/0063—Control arrangements
    • B28B17/0081—Process control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/02—Conditioning the material prior to shaping
    • B28B17/026—Conditioning ceramic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B30B15/304—Feeding material in particulate or plastic state to moulding presses by using feed frames or shoes with relative movement with regard to the mould or moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/32—Discharging presses

Definitions

  • the invention relates to a method and a device for controlling and / or regulating the pressing process of a stone press for the production of moldings from free-flowing masses, in particular refractory, ceramic masses, with a measuring and comparison device for determining setpoint deviations of the pressing parameters, which are used for control of the pressing process, the pressing pressure and the pressing path being measured from the beginning of the pressing process and being compared with one or more predetermined pressure / displacement setpoints or a pressing curve and deviations lying outside a tolerance range being used as a signal for the premature termination of the pressing process.
  • a percussion screw press is known in which the path of the press ram is measured at the end of the press stroke with the aid of a sensor.
  • the transmitter is connected to a measuring and comparison device, in which the determined actual dimension of the stone thickness is compared with the target dimension of the molding to be pressed and used as a signal to switch off the press.
  • a subsequent measuring stroke of the press stamp determines a second actual dimension after the molding has been expanded, which is also compared in the measuring and comparison device with the target dimension of the molding. If there are values that deviate from the target dimension, the dimension of this deviation is used to correct the mold filling quantity of the following pressing process. In this way, the manufacturing process can be controlled with relatively low reject rates.
  • DE-A1-37'15'077 discloses a method for controlling a press for producing moldings from powdered or granular materials, in which the press pressure values are measured as a function of the press travel in the course of a press stroke. A course of the pressing pressure desired for the molding to be measured is determined as a function of the pressing path and stored. The pressing pressure values measured during the subsequent pressing of further moldings are compared with the stored desired course of the pressing pressure. The control of the press during the current pressing and / or for the subsequent pressings is carried out depending on the comparison result.
  • the already finished molding scrap is no longer usable.
  • the finished pressed scrap is very hard and can only be shredded with a relatively high cost and time.
  • Another significant disadvantage is that additives that are added to the mold filling compound prior to pressing have become unusable or irreversibly hardened as a result of the pressing process. These additives must be reprocessed after the rejects have been processed of the shredded material are added to the mold filling compound again.
  • the additives that have become unusable are contained as foreign bodies in the molding compound and contaminate them. The consequence of this is a reduction in the quality of the finished product. In any case, the return of material would involve increased effort.
  • the invention is based on the object of avoiding the disadvantages mentioned and further optimizing the manufacturing process, so that early detection of any defects which may occur is possible before decisive irreversible changes have occurred in the material to be pressed.
  • this object is achieved in that the decision to terminate the pressing process prematurely is made at an early point in time at which no irreversible processes in the material to be pressed have yet taken place are that have a quality-reducing influence on the end product.
  • the pressing process is terminated if there are deviations from the pressure / displacement tolerance value at the latest at a pressing force that corresponds to the maximum pressing force for one cavity.
  • the rejects are comminuted or crumbled and then the crumb mass is fed back to the material to be pressed.
  • the crumb mass is continuously added to the material to be pressed in a certain, technologically advantageous dosage and fed to the press and mixed with it.
  • the crumb mass of the reject molding when the pressing process is ended prematurely is immediately into the feed to the press after the crumbling of the mold filling compound and after its enrichment with additives added.
  • the broke molding is introduced into a comminution device and the comminuted crumb mass is passed into a collecting container, which is arranged above a conveyor belt and seen in the conveying direction of the conveyor belt in front of a material container containing the material to be pressed.
  • the comminuted crumb mass can be sprinkled into a material container containing the material to be pressed, or it can be placed in such a way that partial mixing of the crumb mass with the material takes place automatically after the material has been removed by the conveyor belt.
  • the advantages achieved with the invention consist in particular in that the detection of the pressing path and the pressing pressure enables early detection of rejects with the consequence of the immediate press shutdown.
  • the reject molding is in a state that permits safe recycling for the quality of the end product.
  • the method according to the invention also offers protection against overloading of the press mold, which can occur, for example, when the press cavity is overfilled. This applies in particular to molds with several press cavities arranged side by side. If one cavity is overfilled, the entire pressing pressure would affect this one cavity at the start of the pressing process, while the other cavities would be almost depressurized. In this case, damage to the cavity can only be prevented by prematurely switching off the press or the pressing pressure.
  • the known regulation of the filling quantity can be supplemented with a few additional steps.
  • a hydraulically operated stone press 1 is shown with a fixed lower punch 2, a movable upper punch 3 and a movable mold 5 guided on vertical columns 4.
  • the material 6 to be pressed which consists of a granular or powdery, primarily ceramic mass, is fed via a conveyor line 7 to a material container 8.
  • a material container 8 Previously, 6 different additives were added to the material to improve the physical and chemical properties.
  • the underside of the material container 8 is formed by a conveyor belt 9 with which the material 6 is fed to a metering device 10. With the aid of the horizontally displaceable metering device 10, the material 6 is introduced into the mold 5.
  • the pressing process is initiated and the upper punch 3 is moved downwards.
  • the mold 5 is also lowered by a smaller amount, as shown schematically in FIG. 2.
  • the pressed molding 11 is lowered
  • the mold 5 is removed from the mold and moved out of the mold 5 and transported away on a horizontal table 12 with the aid of a discharge device 13 (FIG. 1).
  • the pressing path 14 and the pressing pressure 15 of the stone press 1 are also monitored (FIG. 2).
  • the pressing path 14 is continuously measured by a measuring sensor (not shown), which is arranged on the stone press 1 in a known manner, and passed on to a measuring and comparison device 16.
  • the pressing pressure 15 is also measured in a known manner and passed on to the measuring and comparison device 16.
  • the measured values are recorded by a recording member 17 and compared in a further device 18 with a predetermined pressing curve 19. which represents the ratio of press pressure 15 and press path 14 as the setpoint.
  • the crumb mass 28 is passed from the comminution device 25 into a collecting container 27, which is arranged in front of the material container 8, as seen in the conveying direction of the conveyor belt 9. From the collecting container 27, the crumb mass 28 is poured onto the running conveyor belt 9 in a certain dosage and mixed with the material 6.
  • the mixing of crumb mass 28 and material 6 is selected in a technologically acceptable ratio in order to achieve a uniform distribution and mixing of the crumb mass 28, which can differ somewhat from material 6 in terms of its composition and grain size. It is not necessary to add additives to the crumb mass 28, since these substances are still present in the broke molding 24 without impairing their effectiveness due to the premature termination of the pressing process.
  • the crumb mass 28 can also be sprinkled directly into the material container 8 via a branch line 34, so that a partial mixing of the crumb mass 28 with the material 6 to be compressed has taken place automatically after the material has been removed by the conveyor belt 9.
  • a further advantageous application of the method according to the invention is provided in that the pressing pressure is automatically switched off when an overload of the pressing mold as a result of an excessive pressing pressure appears during monitoring.
  • the pressing pressure is automatically switched off when an overload of the pressing mold as a result of an excessive pressing pressure appears during monitoring.
  • the pressing pressure is also switched off prematurely in the event of deviations from the desired value or from the specified pressing curve 19 and the pressing process is ended. This results in a simple way an advantageous form securing, which was previously only possible by the mostly electronic measurement of the tension in the stamp or on other pressing elements with a corresponding effort and often without sufficient reliability.
  • the rejects formed as a result of the premature termination of the pressing process are returned to the work cycle in the same way as already described.
  • the method according to the invention also permits the regulation of the mold filling quantity 29, the size of which determines the final dimension of the height or thickness of the molding 11 (FIG. 2). If the comparison carried out in the measuring and comparison device 16 at the end of the pressing process yields deviations from the specified pressing curve 19, then a correction of the mold filling quantity 29 is made on the basis of these deviations via a control line 30, which leads to a controller 31 and an actuator 32 for the following pressing process. If the pressing process ends prematurely, the deviations determined, which have led to the press shutdown, are extrapolated to the end of the pressing process and used to correct the mold filling quantity 29 for the following pressing process.
  • the mold filling quantity 29 is regulated in a known manner with the aid of a filling quantity adjusting device 33. The change in the mold filling quantity can be achieved, for example, by moving the mold 5 upwards or downwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Manufacturing & Machinery (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Processing Of Solid Wastes (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Claims (7)

  1. Procédé pour commander et/ou régler le processus de moulage d'une machine à blocs destinée à fabriquer des briques crues à partir de masses coulantes, notamment de masses en céramique ignifuges, comprenant un dispositif de mesure et de comparaison destiné à déterminer des écarts entre les valeurs de consigne des paramètres de moulage qui sont utilisés pour commander le processus du moulage, la pression de moulage (15) et la course de la machine (14) étant mesurées au début du processus du moulage et comparées à une ou plusieurs valeurs de consigne de pression/course préalablement donné(e)s ou à une courbe de moulage (19), et des écarts situés en dehors d'un domaine de tolérances (20) étant utilisés comme signal pour achever par anticipation le processus de moulage, caractérisé en ce que la décision d'achever par anticipation le processus de moulage est prise si tôt, que la matière à mouler n'a pas encore subi de transformations irréversibles qui diminuent la qualité du produit final.
  2. Procédé selon la revendication 1, caractérisé en ce que, dans le cas d'un moule présentant plusieurs cavités, le processus de moulage se termine par suite d'un écart par rapport à la valeur de consigne de pression/course au plus tard lorsque la force de compression correspond à la force de compression maximale pour une cavité.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la brique de rebut (24) résultant de l'arrêt anticipé du processus de moulage est respectivement concassée et émiettée, puis les fragments (28) sont à nouveau mélangés à la matière à mouler (6).
  4. Procédé selon la revendication 3, caractérisé en ce que les fragments (28) sont mélangés en continu à la matière à mouler (6) pendant l'alimentation de la machine à blocs (1) dans une certaine proportion qui est favorable du point de vue technologique.
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que, immédiatement après avoir émietté la matière de remplissage des moules et après y avoir ajouté des additifs, les fragments (28) sont directement mélangés à la matière alimentant la machine.
  6. Dispositif destiné à mettre en oeuvre le procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'une brique de rebut (24) est introduite dans un concasseur (25) et les fragments émiettés (28) sont acheminés dans un collecteur (27) qui est placé au-dessus d'une bande transporteuse (9) et devant un réservoir (8) contenant la matière à mouler (6) vu dans le sens d'avancement de la bande transporteuse.
  7. Dispositif selon la revendication 6, caractérisé en ce que les fragments émiettés (28) sont collectés dans un réservoir (8) contenant la matière à mouler (6) au moyen d'un dispositif approprié ou alimentent la machine de telle façon que, une fois emportés par la bande transporteuse (9), une partie des fragments (28) se mélange automatiquement à la matière (6).
EP92920609A 1991-11-15 1992-10-02 Procede de commande et/ou de reglage du processus de moulage d'une machine a blocs Expired - Lifetime EP0567606B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH3336/91A CH683243A5 (de) 1991-11-15 1991-11-15 Verfahren zur Steuerung und/oder Regelung des Pressvorganges einer Steinpresse.
CH3336/91 1991-11-15
PCT/CH1992/000200 WO1993009939A1 (fr) 1991-11-15 1992-10-02 Procede de commande et/ou de reglage du processus de moulage d'une machine a blocs

Publications (2)

Publication Number Publication Date
EP0567606A1 EP0567606A1 (fr) 1993-11-03
EP0567606B1 true EP0567606B1 (fr) 1995-06-14

Family

ID=4253770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92920609A Expired - Lifetime EP0567606B1 (fr) 1991-11-15 1992-10-02 Procede de commande et/ou de reglage du processus de moulage d'une machine a blocs

Country Status (10)

Country Link
US (1) US5433903A (fr)
EP (1) EP0567606B1 (fr)
JP (1) JPH06504486A (fr)
CN (1) CN1081983C (fr)
AT (1) ATE123693T1 (fr)
CA (1) CA2100660C (fr)
CH (1) CH683243A5 (fr)
DE (1) DE59202550D1 (fr)
UA (1) UA34431C2 (fr)
WO (1) WO1993009939A1 (fr)

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DE19502596C2 (de) * 1995-01-28 1997-08-28 Fette Wilhelm Gmbh Meßgerät und Rechner zur Überprüfung der auf einer Rundläuferpresse hergestellten Tabletten der laufenden Produktion
US5766524A (en) * 1995-10-16 1998-06-16 Governors Of The University Of Alberta Reclamation of leftover concrete
US5838571A (en) * 1996-01-29 1998-11-17 Alza Corporation Tablet press monitoring and controlling method and apparatus
DE19846210A1 (de) * 1998-10-07 2000-04-13 Dorst Masch & Anlagen Presse zum Herstellen von Formkörpern
JP3737331B2 (ja) * 1999-03-31 2006-01-18 Ｓｐｓシンテックス株式会社 粉体の自動充填方法及び装置
NL1019962C2 (nl) * 2002-02-14 2003-08-15 Struyk Verwo Groep B V Werkwijze voor het vervaardigen van betonnen voorwerpen en inrichting te gebruiken bij die werkwijze.
JP4516275B2 (ja) * 2003-01-24 2010-08-04 株式会社デンソー コージェライトセラミック体の製造方法
DE102005020428A1 (de) * 2005-04-29 2006-11-02 Harald Winkler Anlage und Verfahren zum Herstellen von Betonwaren
CN100436116C (zh) * 2006-08-11 2008-11-26 佛山市恒力泰机械有限公司 粉料液压成型机的位移监测压力式控制方法
JP5178255B2 (ja) * 2008-03-13 2013-04-10 Ｎｔｎ株式会社 研削スラッジの固形化物製造装置および製造方法
DE102008054922A1 (de) * 2008-12-18 2010-06-24 Robert Bosch Gmbh Vorrichtung zum Abfüllen und Verdichten rieselfähiger Produkte
CN103264432A (zh) * 2013-06-01 2013-08-28 咸阳陶瓷研究设计院 一种松散物料陶瓷压制成型机
CN104765381B (zh) * 2014-01-08 2017-09-29 佛山市恒力泰机械有限公司 陶瓷压砖机的动梁起始压制位置的调整方法及系统
CN104977954B (zh) * 2014-04-09 2017-07-28 佛山市恒力泰机械有限公司 一种陶瓷压砖机速度位置双闭环控制方法
CN106272946B (zh) * 2015-06-08 2018-12-07 佛山市恒力泰机械有限公司 一种粉料压砖机自动调整报警位置的方法
CN110815926A (zh) * 2018-08-08 2020-02-21 马会峰 全自动饼式压榨机组脱圈清边机
CN117885366B (zh) * 2024-03-14 2024-07-19 佛山慧谷科技股份有限公司 一种人造石板材的生产系统及其生产方法

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DE2951716A1 (de) * 1979-12-19 1981-07-02 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zum pressen von formkoerpern
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FR2591934A1 (fr) * 1985-12-19 1987-06-26 Lepreux Joel Dispositif pour recuperer les blocs en beton defectueux
US4946634A (en) * 1987-04-16 1990-08-07 Gte Products Corporation Powder compacting press to control green density distribution in parts
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Also Published As

Publication number Publication date
CA2100660A1 (fr) 1993-05-16
CN1073133A (zh) 1993-06-16
EP0567606A1 (fr) 1993-11-03
UA34431C2 (uk) 2001-03-15
JPH06504486A (ja) 1994-05-26
WO1993009939A1 (fr) 1993-05-27
CN1081983C (zh) 2002-04-03
CA2100660C (fr) 2003-12-09
DE59202550D1 (de) 1995-07-20
US5433903A (en) 1995-07-18
ATE123693T1 (de) 1995-06-15
CH683243A5 (de) 1994-02-15

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