EP0075370B1 - Procédé et dispositif pour protéger une presse à fourrage contre un coincement - Google Patents

Procédé et dispositif pour protéger une presse à fourrage contre un coincement Download PDF

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Publication number
EP0075370B1
EP0075370B1 EP19820201154 EP82201154A EP0075370B1 EP 0075370 B1 EP0075370 B1 EP 0075370B1 EP 19820201154 EP19820201154 EP 19820201154 EP 82201154 A EP82201154 A EP 82201154A EP 0075370 B1 EP0075370 B1 EP 0075370B1
Authority
EP
European Patent Office
Prior art keywords
door
press
motor
die
press chamber
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
Application number
EP19820201154
Other languages
German (de)
English (en)
Other versions
EP0075370B2 (fr
EP0075370A1 (fr
Inventor
Nicolaas Christiaan Treurniet
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.)
TREURNIET, NICOLAAS CHRISTIAAN
Original Assignee
Individual
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.)
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Publication date
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Application filed by Individual filed Critical Individual
Publication of EP0075370A1 publication Critical patent/EP0075370A1/fr
Publication of EP0075370B1 publication Critical patent/EP0075370B1/fr
Application granted granted Critical
Publication of EP0075370B2 publication Critical patent/EP0075370B2/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B30B11/20—Roller-and-ring machines, i.e. with roller disposed within a ring and co-operating with the inner surface of the ring
    • B30B11/201—Roller-and-ring machines, i.e. with roller disposed within a ring and co-operating with the inner surface of the ring for extruding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices

Definitions

  • the invention relates to a method and apparatus for protecting a fodder press against jamming, the fodder press comprising a press chamber having a rotary die and a plurality of pressure rolls positioned within the die, each being rotatable about a shaft, a motor for driving the die, as well as a door positioned before the press chamber said door being coupled to a supply opening for raw material.
  • Such a fodder press is disclosed in Dutch patent application 281.048.
  • the raw material such as ground fodder
  • said raw material is mixed with steam.
  • the steam provides on the one hand a lubricating effect during the pressing through the die and on the other hand provides a sufficient binding force to the lump eventually formed from the ground fodder.
  • the supply of steam should be carefully adjusted to the nature and the quantity of the raw material in order to ensure that the pressing through the die takes place with optimally low energy consumption and an optimally high production. If excessive steam in relation to a given quantity. of raw material is supplied, the fodder in the press will obtain a gelatin form and this gelatin formation will block the press, which will increasingly load the drive motor and likewise lead to a substantially lower efficiency.
  • the invention to this effect provides a method of protecting a fodder press of the above mentioned type against jamming, in which the magnitude of the electric current flowing towards the motor is measured and when a predetermined current value is exceeded a control signal is generated by which control signal means are set in operation for opening the door positioned before the press chamber.
  • the invention likewise provides an apparatus for performing the method according to the invention, there being provided means for measuring the electric current flowing towards the motor, means for generating a control signal when a predetermined current value is exceeded and means for opening upon command of said control signal the door positioned before the press chamber.
  • German Offenlegungsschrift 2,013,272 describes a method and an apparatus for comparing the momentary current flowing to the motor of a press with the current that under normal circumstances has to flow to said motor. This comparison is carried out when the motor is in an unloaded condition or when the motor carries out one specific function. When the momentary current is not equal to the current which flows under normal conditions, this is an indication that something is wrong with the motor and the motor is disconnected. In the power lines to the motor also overload fuses can be inserted, to cut off the power when the motor is in an overload condition.
  • Figures 1 and 2 show a fodder press comprising a housing 1 having at its front a press chamber 2 with mounted therein three pressure rolls 3,4 and 5, each being rotatable about a stationary shaft.
  • the pressure rolls coact with the inside of a perforated annular die 6 enclosing said rolls, which die is mounted on the one end of a hollow rotatably mounted shaft 7, which at the other end carries a drive disk 8.
  • the drive disk 8 is coupled to the drive motor 9 via a belt.
  • a door 10 Before the die 6 there is attached to the housing a door 10 which is adapted for rotation about a pivot 10a.
  • the supply of raw material to the press chamber takes places via a suitable opening in the door through a supply 11.
  • the door is provided with an extended attachment member 12 and the housing is provided with an attachment point 13 situated beside the press chamber at the exterior of the housing. Between the free end of the attachment member 12 and the attachment point 13 there is provided an air cylinder 14 which is actuated upon command of a control signal and being adapted to displace the door 10 from the closed position shown in fig. 2 in full lines towards the open position shown in dotted lines.
  • an air cylinder instead of an air cylinder other members may be used which under influence of a control signal ensure the required opening of the door.
  • Fig. 3 diagrammatically shows an electric circuit for generating the control signal for the air cylinder 14.
  • a transducer 20 which is connected to a device 21.
  • the device 21 is adapted to produce a control signal when the current that flows through the line T exceeds an adjustable predetermined value.
  • a device 21 may for instance be a contact ammeter having an adjustable response value, as marketed under the tradename Fotact.
  • the control signal of the device 21 is supplied to a relay 22 a contact 22a of which is incorporated in the feed line for the air cylinder 14, which is diagrammatically shown.
  • the relay 22 under influence of the control signal of the device 21 is responsive, the contact 22a is closed and the cylinder is energized in such a way that the door 10 of the press is opened.
  • the method according to the invention is performed as follows.
  • the device 21 is set in such a way that it produces a control signal when a predetermined current value is exceeded, e.g. at a value which is 20% higher than the value upon normal operation.
  • This current value is chosen in such a way that at the predetermined current value an initial gelatin formation in the press chamber 2 occurs.
  • the device 21 produces the control signal and the air cylinder 14 is energized through relay contact 22a and opens the door 10 of the press. All the raw material still present in the supply 11 and at the inside of the door falls downwardly and can no longer reach the press chamber 2.
  • the loose, raw material still present in the press chamber 2 can also fall out of the press chamber, while the raw material still present between the pressure rolls and the die is pressed through the die, so.that the press therefore is completely self-cleaned without human intervention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Fodder In General (AREA)

Claims (7)

1. Un procédé pour protéger contre le coincement une presse à fourrage, cette presse à fourrage comprenant une chambre de pressage (2) pourvue d'une matrice rotative (6) et d'une pluralité de rouleaux presseurs (3, 4, 5) disposés à l'intérieur de la matrice (6), chaque rouleau pouvant tourner autour d'un axe, un moteur (9) destiné à entraîner la matrice (6), ainsi qu'une porte (10) montée devant la chambre de pressage (2), ladite porte étant couplée à une ouverture d'alimentation (11) pour la matière première, caractérisé en ce que la valeur du courant électrique traversant le moteur (9) est mesurée, et que, lorsqu'une valeur prédéterminée du courant est dépassée, un signal de commande est produit et met en service un moyen de commande (14) pour ouvrir la porte (10) disposée devant la chambre de pressage (2).
2. Un procédé conforme à la revendication 1, caractérisé en ce que le centre de la porte (10) est ouvert à une vitesse supérieure à environ 0,15 :m/s.
3. Un procédé conforme à la revendication 1 ou 2, caractérisé en ce que le centre de la porte (10) est ouvert au moyen d'un cylindre pneumatique (14).
4. Un dispositif pour protéger une presse à fourrage contre le coincement, la presse à fourrage comprenant une chambre de pressage (2) pourvue d'une matrice rotative (6) et d'une pluralité de rouleaux presseurs (3, 4, 5) disposés à l'intérieur de la matrice (6) chaque rouleau pouvant pivoter autour d'un arbre, un moteur (9) pour l'entraînement de la matrice (6), ainsi qu'une porte (10) montée devant la chambre de pressage (2), ladite porte étant accouplée à une ouverture d'alimentation (11) pour la matière première, caractérisé en ce que l'on dispose d'un moyen (20) pour mesurer le courant électrique qui traverse le moteur (9) un moyen (21) pour produire un signal de commande lorsqu'une valeur prédéterminée du courant est dépassée et un moyen (14) pour ouvrir sur commande dudit signal de commande, la porte (10) montée devant la chambre de pressage (2).
5. Un dispositif conforme à la revendication 4, caractérisé en ce que le moyen destiné à ouvrir la porte comprend un cylindre pneumatique (14).
6. Un dispositif conforme à la revendication 4, caractérisé en ce que le moyen destiné à ouvrir la porte comprend deux cylindres disposés de chaque côté de la porte, chaque cylindre comprenant un arbre d'entraînement fileté et un moteur pour entraîner ledit arbre, le dispositif étant tel que la porte peut être avancée par les arbres d'entraînement à une position parallèle à la face avant de la chambre de presse mais à une certaine distance de cette dernière.
7. Un dispositif conforme à la revendication 4 ou 5, caractérisé en ce que le moyen destiné à mesurer le passage du courant à travers le moteur consiste en un ampèremètre à contacts.
EP19820201154 1981-09-21 1982-09-17 Procédé et dispositif pour protéger une presse à fourrage contre un coincement Expired EP0075370B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8104343A NL8104343A (nl) 1981-09-21 1981-09-21 Vastloopbeveiliging.
NL8104343 1981-09-21

Publications (3)

Publication Number Publication Date
EP0075370A1 EP0075370A1 (fr) 1983-03-30
EP0075370B1 true EP0075370B1 (fr) 1985-02-13
EP0075370B2 EP0075370B2 (fr) 1990-01-24

Family

ID=19838097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820201154 Expired EP0075370B2 (fr) 1981-09-21 1982-09-17 Procédé et dispositif pour protéger une presse à fourrage contre un coincement

Country Status (3)

Country Link
EP (1) EP0075370B2 (fr)
DE (1) DE3262341D1 (fr)
NL (1) NL8104343A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3711379A1 (de) * 1987-04-04 1988-10-20 Hoelter Heinz Pelletisierpresse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1211908B (de) * 1962-08-29 1966-03-03 Weserhuette Ag Eisenwerk Sicherungsvorrichtung zum UEberlastungsschutz von Zerkleinerungsmaschinen gegen im Foerdergut enthaltene Fremdkoerper
US3167813A (en) * 1962-09-10 1965-02-02 California Pellet Mill Co Extrusion mill and feeder means therefor
NL6412189A (fr) * 1963-12-17 1965-06-18
DE2013272A1 (de) * 1970-03-20 1971-10-07 Maschinenfabrik Weingarten Ag, 7987 Weingarten Verfahren und Einrichtung zur Uberwa chung des Laufbereiches einer Maschine, insbesondere einer Presse
GB1249265A (en) * 1970-03-31 1971-10-13 Fortschritt Veb K Improvements in or relating to machines for pressing bulk material through apertures in a grating

Also Published As

Publication number Publication date
DE3262341D1 (en) 1985-03-28
NL8104343A (nl) 1983-04-18
EP0075370B2 (fr) 1990-01-24
EP0075370A1 (fr) 1983-03-30

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