• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In operation of a screw extruder, particularly a pin extruder, processing a rubber or a plastic mixture, troubling disturbances and on occasion heavy damage occur when foreign bodies are introduced into the extruder with the material to be processed causing damage to the extruder structure. In order to avoid this damage one possibility is to shut off the extruder at a sufficiently early time and of course immediately when an appropriate dangerous condition is detected. Therefore the drive torque which is taken by the extruder screw shaft is compared with the mass pressure in the mixture to be processed. As soon as this compared value no longer follows the functional dependence of the normal operating parameters such as the rotation speed of the extruder shaft, viscosity of the mixture, temperature lowering of the tempering medium, the volume increase of the mixture drawn in the extruder inlet or the like, the extruder is automatically shut off since a disturbance by foreign bodies is assumed. For determination of the torque a torque measuring shaft is used or a measured quantity proportional to it referred to. The mass pressure can be measured in the material to be processed by a mass pressure sensor in a pin of a pin cylinder in the extruder.
    公开号:SU1517753A3
    申请号:SU864028667
    申请日:1986-12-18
    公开日:1989-10-23
    发明作者:Крокснес Финн
    申请人:Фрид.Крупп, Гмбх (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a method of controlling screw extruders, in particular with pin cylinders, for processing rubber and / or plastic mixtures and can be used in chemical industry.
    The purpose of the invention is to prevent damage to an extruder.
    The drawing shows an extruder for carrying out the proposed method, a general view.
    The screw pin extruder 1 has a cylindrical body 2 consisting of three parts, in which an extruder screw (not shown) rotates. An extruder screw with an extended screw shank 3 is driven by a drive motor 4 of an extruder through an electrical torque measurement shaft 5. A tachogenerator is fitted to the drive motor 4 of the extruder to determine the engine speed 4. The drive motor 4 of the extruder through connection 7 is supplied with current from the switchgear cabinet 8. The measuring signal of the tachogenerator 6 through connection 7a is supplied to the switchgear cabinet B and is fed from there computer 9.
    ate
    4j
    SP
    with

    cm
    315
    This machine also measures the measuring shaft of the torque measuring shaft 5 through the line 10. The entrance 11 of the housing 2 is provided with a feed funnel 12 with a feeding rod 13 for introducing the mixture to be treated. In the central part 14 of the housing 2, embodied in the form of a pin cylinder, are cylindrical pins 15. A mass pressure receiver 16 is inserted into one of the cylindrical pins 15. The measuring signal of the receiver 16 of the pressure of the mass through the line 17 is also introduced into the computer 9, which disconnects the extruder during the torque supply due to the nocTopoHHirx bodies in the mixture.
    The method of controlling screw extruders is that they determine faults in the extruder and give a signal to disconnect the drive of the extruder. Failure of malfunctions is determined by the fact that during the operation of screw extruders occur that foreign bodies are brought into the extruder, in particular, metal parts, which then cause, depending on the shape and size of foreign bodies, deformations and static fractures of the screw partitions. The fractured portions of the partitions, in turn, cause, as a rule, severe subsequent damage, often making it impossible to further fabricate using an extruder, although the initial damage is in most cases not very large. This is significant, in particular, with respect to extruders with cylinders fitted with cylindrical pins, through I I radially from the housing into the screw space between the screw auger, so-called pin extruders, which have become more common in recent years. The reasons for this are the increased performance of these extruders and the lower extrusion rate of these extruders. According to the monitoring method for determining the faults, the pressure of the mass of the mixture in the extruder is measured. The pressure of the mass of the mixture in the extruder is used as a comparative value for the transfer of torque between 3
    full mixture of the extruder screw and the housing wall, measured using the auger shank, torque change or variable
    proportional to the change in torque, the measured value is compared with the comparative values determined on the basis of the mass head. If the change in torque on the shank of the screw and the change determined on the basis of the mass head do not match, then this is used as a measure of change
    torque due to extraneous bodies or the like in the mixture, and therefore the increase in torque on the shank of the extruder screw causes the message
    about malfunction and / or disconnection of the extruder drive.
    The mass apora is measured using an electric mass head receiver 16. To assess whether
    the increase in torque due to extraneous bodies in the mixture, the change in direct current (dl) of the extruder drive motor 4 is compared with the change in pressure (dp) of mass in
    extruder and that a necessary precondition for shutting down extruder 1 due to the presence of foreign bodies in the mixture is the occurrence of an increase in direct current without
     a corresponding increase in the mass head and to assess whether there is a sufficient condition for turning off the extruder 1, take into account the temporal variation of the measurement values (dl / dt), respectively dp / dt, the change in the level of measurement values, as well as the change in the number of revolutions of the extruder uiHeKa. The receiver of a pressure of weight is located in shchindrichesky
    pin 15 pin cylinder. At-.
    The pressure head of the mass is located in
    the first row of cylindrical pins after the hopper 12 of the extruder 1.
    The control method is based on the fact that it is possible to use parameters that can be measured in the power distribution unit, such as current, voltage and speed, and, moreover, to use measuring equipment.
    The increase in torque on the screw shaft of the extruder may have

    The following reasons: foreign bodies in the mixture, in particular metal parts, are wedged in the area of the pin cylinder; increase the number of revolutions of the screw extruder; increased viscosity of the mixture; lowering the temperature of tempered media; increasing the volume of the mixture drawn into the extruder inlet.
    Experiments have shown that causes of C simultaneously with an increase in torque also cause a change in the pressure of the mass in the extruder, so that it becomes possible to filter out the cause a from the total increase in torque.
    A torque measurement shaft can be used to register the total torque. It is simpler to use a measurement quantity proportional to the total torque. Especially suitable for this is constant (DC drive current, commonly used today in extruder systems.
    The time difference between the registration of the total torque and the change in pressure for reasons V is so small, in particular if the mass pressure receiver is placed in the first row of pins in the feed direction that the installation can be shut off in time when there is a reason a, that is, in order to avoid subsequent damage.
    In evaluating the measured data as to whether a case a is, their gradients are compared, in particular. However, average values and maximum values of previous measurement values can also be used for evaluation.
    It can also be imagined that all movement quantities of the mixture are memorized during the test cycle and serve as comparative ethanol for subsequent automatic operation.
    The fluctuations of the measured data within a certain bandwidth remain unaccounted for when evaluating. The basis for this bandwidth is continuously filled measured data.
    17753
    The registration and evaluation of the measurement values is carried out using an electronic computer. 5 Thus, the proposed cnocoL provides the possibility of simply preventing damage to the extruder with lower costs than in the known solutions, which provide for the installation of means for signaling the breaking of the pin in each pin, of which the extruder may contain 100 pieces.
    权利要求:
    Claims (3)
    [1]
    1. A method of controlling screw extruders, in particular pin extruders with cylindrical pins for processing rubber and / or plastic mixtures, including troubleshooting and a signal to turn off the drive of the extruder, in order to prevent damage to the extruder to determine malfunctions measure the pressure of the mass of the mixture in the extruder and use it as a comparative amount of torque transfer between the extruder screw filled with the mixture and the cylinder wall, then measure A change in torque or variable proportional to the change in torque is measured on the shank of the screw and compared with comparative values determined by the pressure of the mass, and if the change in torque does not coincide with the change in torque determined by the pressure of the mass, the difference is used as a measure of the change in torque. moment due to foreign bodies in the mixture, and the increase in torque on the auger shank is used as a signal of failure in operation and / or shutdown of the extruder drive.
    [2]
    2, Method pop, 1, characterized in that a change in the direct current-drive motor of the extruder is used as the measurement value of the change in torque, which is compared
    with a change in the pressure of the mass, and the disconnection of the drive of the extruder is triggered in the presence of an increase in direct current without a corresponding voltage
    five
    0
    five
    0
    five
    The bed of the mass head, when a sufficient condition is met for switching off, taking into account the temporary change of the measurement values (dl / dt, respectively, dp / dt), the change in the level of the measurement values, and the change in the number of auger revolutions.
    [3]
    3. The way popp. 1 and 2, characterized in that the mass pressure is measured in the cylindrical pin of the extruder.
    4, the method according to claim 3, characterized in that the pressure of the mass is measured in a cylindrical pin of the first row after the hopper.
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    同族专利:
    公开号 | 公开日
    JPS62148236A|1987-07-02|
    US4759890A|1988-07-26|
    DD252793A5|1987-12-30|
    FR2591937B1|1990-01-19|
    GB2184388A|1987-06-24|
    ES2002082A6|1988-07-01|
    GB2184388B|1990-01-24|
    JPH0679827B2|1994-10-12|
    GB8629972D0|1987-01-28|
    FR2591937A1|1987-06-26|
    DE3545747C2|1994-10-06|
    IT8622658D0|1986-12-12|
    DE3545747A1|1987-06-25|
    IT1213404B|1989-12-20|
    引用文献:
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    US3733059A|1971-08-10|1973-05-15|Rosemount Inc|Plastic extruder temperature control system|
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    JPS5981153A|1982-11-01|1984-05-10|Sumitomo Rubber Ind Ltd|Abnormality-detecting mechanism for rubber extruder|
    DE3310484C1|1983-03-23|1984-07-12|Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover|Method for achieving maximum output of a twin screw extruder|
    US4510104A|1983-10-07|1985-04-09|Rca Corporation|Apparatus and method for automatically controlling an extruder for thermoplastic material|
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    US4671908A|1986-06-26|1987-06-09|Phillips Petroleum Company|Extrusion control process and apparatus|DE4208284C1|1992-03-13|1993-02-11|Paul Troester Maschinenfabrik, 3000 Hannover, De|
    DE19515130A1|1995-04-25|1996-10-31|Werner & Pfleiderer|Device for measuring the torque input in multi-shaft extruders|
    DE29811899U1|1998-07-03|1998-09-24|Hilger & Kern Gmbh|Dynamic mixing tube|
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    DE102009038280A1|2009-08-21|2011-02-24|Entex Rust & Mitschke Gmbh|Producing mixtures of inorganic filler material particle and plastic in an extrusion plant, comprises melting the plastic independent of the inorganic filler material and then mixing the plastic with the inorganic filler material|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE3545747A|DE3545747C2|1985-12-21|1985-12-21|Extruder monitoring|
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