EP0023253B1 - Mixer for the continuous glueing of wood chips, wood fibres or the like - Google Patents

Mixer for the continuous glueing of wood chips, wood fibres or the like Download PDF

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Publication number
EP0023253B1
EP0023253B1 EP80103071A EP80103071A EP0023253B1 EP 0023253 B1 EP0023253 B1 EP 0023253B1 EP 80103071 A EP80103071 A EP 80103071A EP 80103071 A EP80103071 A EP 80103071A EP 0023253 B1 EP0023253 B1 EP 0023253B1
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EP
European Patent Office
Prior art keywords
counterweight
motor
mixer
throttle
mixer according
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
EP80103071A
Other languages
German (de)
French (fr)
Other versions
EP0023253A1 (en
Inventor
Werner Christen
Helmut Müller
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.)
Draiswerke GmbH
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Draiswerke GmbH
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Filing date
Publication date
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Priority to AT80103071T priority Critical patent/ATE1046T1/en
Publication of EP0023253A1 publication Critical patent/EP0023253A1/en
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Publication of EP0023253B1 publication Critical patent/EP0023253B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0227—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer
    • B27N1/0236—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer with the stirrers rotating about an horizontal axis, e.g. in consecutive casings
    • B27N1/0245—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer with the stirrers rotating about an horizontal axis, e.g. in consecutive casings with a single stirrer shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/45—Closures or doors specially adapted for mixing receptacles; Operating mechanisms therefor
    • B01F35/451—Closures or doors specially adapted for mixing receptacles; Operating mechanisms therefor by rotating them about an axis parallel to the plane of the opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms

Definitions

  • the invention relates to a mixer according to the preamble of claim 1.
  • Such mixers are known from DE-A27 17896. Depending on the pressure of the mix against the throttle valve, it opens more or less.
  • the distance of the counterweight from the swivel axis of the throttle valve can be adjusted so that a basic adaptation to certain predetermined operating conditions, such as type of chips and the like, is possible.
  • Reliable load maintenance i.e. A reliable keeping of the current or power consumption of the drive motor of the mixer even with changing operating conditions of the mixer is not possible with this known system.
  • the invention is therefore based on the object of designing a mixer of the generic type in such a way that it is possible to maintain a constant load.
  • the mixer shown in the drawing has a cylindrical mixing container 1, which consists of an inner trough 2 forming its inner wall and a cooling jacket 3 surrounding the inner trough.
  • the mixing container 1 is closed at its ends by end walls 4, 5.
  • a mixed material inlet funnel 6 is provided, which opens tangentially from above with a mixed material inlet opening 7 into the interior 1 ′ of the mixing container 1 enclosed by the inner trough 2 and the end walls 4 and 5.
  • a tangible discharge hopper 8 8
  • the mixing container 1 is divided in half in the horizontal plane, the upper half 9 and the lower half 10 of the mixing container 1 being held together on one long side by hinge joints 11 and on the opposite long side by toggle locks 12 so that they can be swung open and apart.
  • a mixer shaft 13 is arranged coaxially, which is mounted in bearings 14, 15 and can be driven by a motor 16 by means of V-belts 17 and a V-belt pulley 18 mounted on the mixer shaft 13 in a rotationally fixed manner.
  • Balancing disks 19, 20 are attached to the mixer shaft 13.
  • a cooling water supply pipe 21 is arranged which rotates therewith. Threaded bushings 22 are mounted on the mixer shaft 13, into which hollow mixer tools 23 are screwed.
  • a cooling water pipe 24 branches off from the cooling water supply pipe 21 into each hollow mixing tool 23, so that the cooling water flows through the cooling water supply pipe 21, the further cooling water pipes 24, through the interior of each mixing tool 23 into the annular space located between the cooling water supply pipe 21 and the mixer shaft 13 .
  • the cooling water passes through a cooling water connection 25, which is provided on the left in FIG. 1, into the mixer shaft 13, the cooling water inlet having a and the cooling water outlet are designated by b.
  • a glue feed pipe 26 which does not rotate with it and projects into the hollow mixer shaft 13.
  • glue flows through passage openings 27 into the interior of the hollow mixer shaft 13, from where it is immersed through glue centrifugal pipes 28, which have their outlet openings 29 in the mixture ring 30 built up on the inner wall of the mixing container 1 due to the far supercritical speed of the mixer shaft 13, is thrown out.
  • a separating disc 31 is arranged in the hollow mixer shaft 13 between the mutually adjacent ends of the cooling water supply pipe 21 and the glue supply pipe 26.
  • the adjoining region in which the cooled mixing tools 23 are arranged on the mixer shaft 13 is one Post-mixing zone C.
  • the mixing container 1 together with bearings 14, 15 is supported against the floor 34 by a machine frame 33.
  • Such a mixer is known for example from DE-C 20 57 594 (corresponding to US-A 3 734471) or DE-A2717896.
  • a so-called outer gluing can also be provided, in which in the same mixing container section B glue addition tubes penetrate the cooling jacket 3 and the inner trough 2 from the outside, which also end with their outlet openings in the mixture ring 30.
  • glue addition tubes penetrate the cooling jacket 3 and the inner trough 2 from the outside, which also end with their outlet openings in the mixture ring 30.
  • a mixture outlet opening 35 opens into the outlet outlet funnel 8.
  • This outlet opening 35 can be closed in a manner known per se by means of a throttle valve 36 which is adapted to the course of the inner trough 2 in the region of this outlet outlet opening 35 and which is on its upper, axially parallel edge is articulated by means of swivel joints 37 on the mixing container 1 and can be swiveled downward and to the side (in FIG. 2 to the right) according to the swivel direction arrow 38 by the pressure of the mixed material from the closed position shown in FIG. 2, so that the mixed material outlet opening 35 more or is opened less so that, in turn, the mixing tools 23 moving in the direction of rotation 39 eject the material to be mixed through the material outlet opening 35, which is then more or less open, into the material outlet funnel 8.
  • a bracket 40 On the outside of the throttle valve 36, a bracket 40 is attached, to which a guide rod 41 which extends approximately horizontally outwards when the throttle valve 36 is closed is rigidly attached.
  • the stator housing 43 of a commercially available spindle motor 44 is displaceably mounted on the guide rod 41 by means of a guide bush 42.
  • the spindle 45 of the spindle motor 44 is articulated with its end facing the mixing container 1 on the console 40 with play, the arrangement being such that the guide rod 41 on the one hand and the spindle 45 on the other hand run parallel to one another.
  • a current transformer 52 is connected, which outputs a voltage proportional to the current consumption of the motor 16, which voltage is rectified in a bridge rectifier 53.
  • This DC voltage signal is then fed to a controller 54, where it is converted into a corresponding current in a resistor 55.
  • a potentiometer 56 is connected in parallel with the resistor 55 as a setpoint generator, the output of which is connected to the output of the resistor 55. At this interconnection point 57, the current coming from the setpoint generator and the current coming from the resistor 55 are added together.
  • a negative current is specified in each case from the setpoint generator, while a positive current is specified from potentiometer 55.
  • An operational amplifier 58 is connected downstream of the interconnection point 57 and, depending on whether a positive or negative current difference is applied to the operational amplifier from the interconnection point 57, pumps a corresponding signal to a power amplifier 59 connected downstream of the controller 54.
  • the spindle motor 44 is then controlled by the power amplifier 59 and move its stator housing 43 on the guide rod 41 until the current consumption of the motor 16 again matches the setpoint specified on the potentiometer 56.
  • the power amplifier 59 is followed by a solenoid valve 60 which switches the hydraulic supply either to the liquid line 49 or 50, the other liquid line then serving as the unpressurized return line. Otherwise, the entire circuit is the same.
  • a counterweight can naturally also be provided, which can be displaced by means of a spindle on a guide rod by a motor which is coupled to it, but separately and fixedly attached to the throttle valve 36.
  • the drive is expediently carried out via a countershaft transmission. Since in such a case it would be particularly expedient to provide the motor axially parallel to the swivel joints 37, a bevel drive would also have to be provided in such a case.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

An apparatus for mixing solid particles and a liquid, especially wood chips and glue. A motor-driven stirrer in a cylinderical trough continuously mixes the materials which enter at one end of the trough and are discharged at the other end. The outlet of the trough has a pivotable throttle with a counterweight which controls the degree of opening of the throttle. An electrical signal related to the load on the stirrer motor is the control signal for a control loop whose final control element displaces the counterweight to maintain the electrical load of the drive motor approximately constant.

Description

Die Erfindung betrifft einen Mischer nach dem Oberbegriff des Anspruches 1.The invention relates to a mixer according to the preamble of claim 1.

Derartige Mischer sind aus der DE-A27 17896 bekannt. Je nach dem Druck des Mischgutes gegen die Drosselklappe öffnet sich diese mehr oder weniger weit. Der Abstand des Gegengewichtes von der Schwenkachse der Dosselklappe kann eingestellt werden, so daß eine Grundanpassung an bestimmte vorgegebene Betriebsverhältnisse, wie Art der Späne und dgl. möglich ist.Such mixers are known from DE-A27 17896. Depending on the pressure of the mix against the throttle valve, it opens more or less. The distance of the counterweight from the swivel axis of the throttle valve can be adjusted so that a basic adaptation to certain predetermined operating conditions, such as type of chips and the like, is possible.

Alternativ ist es aus der DE-C 20 57 594 bekannt, die Drosselklappe selber mittels eines Elektromagneten zu öffnen, der unter anderem in Abhängigkeit von der Strom- bzw. Leistungsaufnahme des Antriebsmotors der Mischwerkswelle erregt wird, so daß die - für eine bestimmte Stromaufnahme des Motors jeweils unveränderbare - Öffnungsstellung der Drosselklappe mit sich ändernder Stromaufnahme auch jeweils verändert wird.Alternatively, it is known from DE-C 20 57 594 to open the throttle valve itself by means of an electromagnet which is excited, inter alia, as a function of the current or power consumption of the drive motor of the mixer shaft, so that the - for a specific current consumption of the Motors each immutable - opening position of the throttle valve is also changed with changing current consumption.

Eine zuverlässige Last-Konstanthaltung, d.h. eine zuverlässige Konstanthaltung der Strom- bzw. Leistungsaufnahme des Antriebsmotors des Mischers auch bei wechselnden Betriebsbedingungen des Mischers ist mit diesem bekannten System nicht möglich.Reliable load maintenance, i.e. A reliable keeping of the current or power consumption of the drive motor of the mixer even with changing operating conditions of the mixer is not possible with this known system.

Der Erfindung liegt daher die Aufgrabe zugrunde, einen Mischer der gattungsgemäßen Art so auszugestalten, daß eine Last-Konstanthaltung zuverlässig möglich ist.The invention is therefore based on the object of designing a mixer of the generic type in such a way that it is possible to maintain a constant load.

Diese Aufgabe wird bei einem gattungsgemäßen Mischer durch die Merkmale des Kennzeichnungsteils des Anspruches 1 gelöst. Durch die erfindungsgemäßen Maßnahmen wird also der ohnehin vorhandenen Möglichkeit, daß sich die Drosselklappe entsprechend dem Druck des Mischgutes im Mischbehälter öffnet, die weitere Möglichkeit überlagert den in jeder Öffnungsstellung der Drosselklappe vorhandenen Schließdruck aufgrund des Gegengewichtes zu verändern. Dadurch daß das Gehäuse des Stellmotors selber das abstandseinstellbare Gegengewicht bildet, ist eine außerordnetlich einfache Ausgestaltung möglich. Aufgrund der erfindungsgemäßen Maßnahmen kann - bei halbautomatischer Ausführung - der Bedienungsmann bei Ansteigen der Stromaufnahme des Antriebsmotors das Gegengewicht zur Schwenkachse der Drosselklappe hin verfahren, so daß der Schließdruck der Drosselklappe insgesamt geringer wird, und umgekehrt. Bei vollautomatischer Ausgestaltung ist dann der zum Verstellen des Gegengewichtes dienende Motor das Stellglied eines Regelkreises zur Konstanthaltung der Strom- bzw. Leistungsaufnahme des Motors der Mischwerkswelle.This object is achieved in a generic mixer by the features of the characterizing part of claim 1. With the measures according to the invention, the possibility that the throttle valve opens in accordance with the pressure of the material to be mixed in the mixing container is thus superimposed on the further possibility of changing the closing pressure present in each open position of the throttle valve due to the counterweight. Because the housing of the servomotor itself forms the distance-adjustable counterweight, an extraordinarily simple configuration is possible. Due to the measures according to the invention, the operator can move the counterweight to the pivot axis of the throttle valve when the current consumption of the drive motor increases, so that the closing pressure of the throttle valve is lower overall, and vice versa. In the case of a fully automatic design, the motor used to adjust the counterweight is the actuator of a control circuit for keeping the current or power consumption of the motor of the mixer shaft constant.

Durch diese Maßnahmen können Betriebsunterbrechungen wegen Mischerverstopfung oder Motorüberlastung weitestgehend ausgeschlossen werden. Weiterhin kann durch diese feine Regelung insgesamt die Beleimungsqualität der Späne verbessert werden, da auch kurzfristige Schwankungen der Betriebsverhältnisse, wie z.B. Dichteschwankungen der Spangemische od. dgl. ausgeglichen werden können.These measures can largely rule out operational interruptions due to mixer clogging or motor overload. Furthermore, this fine regulation can improve the overall gluing quality of the chips, since short-term fluctuations in the operating conditions, e.g. Fluctuations in density of the chip mixtures or the like can be compensated for.

Weitere Vorteile und Merkmale der Erfindung ergeben sich im übrigen aus den Unteransprüchen und den nachfolgenden Erläuterungen anhand der Zeichnung. In der Zeichnung zeigt.

  • Figur 1 einen Mischer gemäß der Erfindung im vertikalen Längsschnitt,
  • Figur 2 einen Schnitt durch den Mischer gemäß der Schnittlinie 11-11 in Fig. 1,
  • Figur 3 einen Teilausschnitt aus Fig. 2 mit einer Variante des Gegengewichts,
  • Figur4 einen Regelkreis für die Ausführungsform nach Fig. 2 und
  • Figur 5 einen Regelkreis für die Ausführungsform nach Fig. 3.
Further advantages and features of the invention emerge from the subclaims and the following explanations with reference to the drawing. In the drawing shows.
  • 1 shows a mixer according to the invention in vertical longitudinal section,
  • FIG. 2 shows a section through the mixer according to section line 11-11 in FIG. 1,
  • FIG. 3 shows a partial section from FIG. 2 with a variant of the counterweight,
  • Figure 4 shows a control loop for the embodiment of FIGS. 2 and
  • FIG. 5 shows a control loop for the embodiment according to FIG. 3.

Der in der Zeichnung dargestellte Mischer weist einen zylindrischen Mischbehälter 1 auf, der aus einem dessen Innenwand bildenden Innentrog 2 und einem den Innentrog umgebenden Kühlmantel 3 besteht. Der Mischbehälter 1 ist an seinen Enden durch Stirnwände 4, 5 abgeschlossen. An einem - in Fig. 1 rechten - Ende des Michbehälters 1 ist ein Mischgutzulauftrichter 6 vorgesehen, der tangential von oben mit einer Mischgutzulauföffnung 7 in den vom Innentrog 2 und den Stirnwänden 4 und 5 umschlossenen Innenraum 1' des Mischbehälters 1 einmündet. An dem anderen - in Fig. 1 linken - Ende ist ein ebenfalls tangential ausmündender Mischgutauslauftrichter 8 vorgesehen. Der Mischbehälter 1 ist in der Horizontalebene hälftig geteilt, wobei die obere Hälfte 9 und die untere hälfte 10 des Mischbehälters 1 an einer Längsseite durch Scharniergelenke 11 und auf der gegenüberliegenden Längsseite durch Kniehebelverschlüsse 12 lösbar und aufschwenkbar zusammengehalten werden. Im Mischbehälter 1 ist eine Mischwerkswelle 13 koaxial angeordnet, die in Lagern 14, 15 gelagert ist und von einem Motor 16 mittels Keilriemen 17 und eine auf der Mischwerkswelle 13 drehfest angebrachte Keilriemenscheibe 18 antreibbar ist. Auf der Mischwerkswelle 13 sind Auswuchtscheiben 19, 20 angebracht. In der Mischwerkswelle 13 ist eine mit dieser umlaufendes Kühlwasserzuführrohr 21 angeordnet. Auf der Mischwerkswelle 13 sind Gewindebuchsen 22 angebracht, in die hohl ausgebildete Mischwerkzeuge 23 eingeschraubt sind. Von dem Kühlwasserzuführrohr 21 zweigt in jedes hohl ausgebildete Mischwerkzeug 23 jeweils ein Kühlwasserrohr 24 ab, so daß das Kühlwasser durch das Kühlwasserzuführrohr 21, die weiteren Kühlwasserrohre 24, durch den Innenraum jedes Mischwerkzeugs 23 in den zwischen dem Kühlwasserzuführrohr 21 und der Mischwerkswelle 13 befindlichen Ringraum fließt. Das Kühlwasser gelangt über einen - in Fig. 1 links vorgesehenen - Kühlwasseranschluß 25 in die Mischwerkswelle 13, wobei der Kühlwasserzulauf mit a und der Kühlwasserablauf mit b bezeichnet sind. Am anderen - in Fig. 1 rechten - Ende der Mischwerkswelle 13 ist ein nicht mit dieser umlaufendes, in die hohl ausgebildete Mischwerkswelle13 hineinragendes Leimzuführrohr 26 angeordnet. Aus diesem Leimzuführrohr 26 fließt Leim durch Durchlaßöffnungen 27 in das Innere der hohlen Mischwerkswelle 13, von wo der durch Leimschleuderrohre 28, die mit ihren Auslauföffnungen 29 in den aufgrund der weit überkritischen Drehzahl der Mischwerkswelle 13 an der Innenwand des Mischbehälters 1 aufgebauten Mischgutring 30 eintauchen, ausgeschleudert wird. Zwischen den einander benachbarten Enden des Kühlwasserzuführrohres 21 und des Leimzuführrohres 26 ist in der hohl ausgebildeten Mischwerkswelle 13 eine Trennscheibe 31 angeordnet.The mixer shown in the drawing has a cylindrical mixing container 1, which consists of an inner trough 2 forming its inner wall and a cooling jacket 3 surrounding the inner trough. The mixing container 1 is closed at its ends by end walls 4, 5. At one end of the mixing container 1, which is on the right in FIG. 1, a mixed material inlet funnel 6 is provided, which opens tangentially from above with a mixed material inlet opening 7 into the interior 1 ′ of the mixing container 1 enclosed by the inner trough 2 and the end walls 4 and 5. At the other end, which is on the left in FIG. 1, there is also a tangible discharge hopper 8. The mixing container 1 is divided in half in the horizontal plane, the upper half 9 and the lower half 10 of the mixing container 1 being held together on one long side by hinge joints 11 and on the opposite long side by toggle locks 12 so that they can be swung open and apart. In the mixing container 1, a mixer shaft 13 is arranged coaxially, which is mounted in bearings 14, 15 and can be driven by a motor 16 by means of V-belts 17 and a V-belt pulley 18 mounted on the mixer shaft 13 in a rotationally fixed manner. Balancing disks 19, 20 are attached to the mixer shaft 13. In the mixer shaft 13, a cooling water supply pipe 21 is arranged which rotates therewith. Threaded bushings 22 are mounted on the mixer shaft 13, into which hollow mixer tools 23 are screwed. A cooling water pipe 24 branches off from the cooling water supply pipe 21 into each hollow mixing tool 23, so that the cooling water flows through the cooling water supply pipe 21, the further cooling water pipes 24, through the interior of each mixing tool 23 into the annular space located between the cooling water supply pipe 21 and the mixer shaft 13 . The cooling water passes through a cooling water connection 25, which is provided on the left in FIG. 1, into the mixer shaft 13, the cooling water inlet having a and the cooling water outlet are designated by b. At the other end of the mixer shaft 13, which is on the right in FIG. 1, there is a glue feed pipe 26 which does not rotate with it and projects into the hollow mixer shaft 13. From this glue feed pipe 26, glue flows through passage openings 27 into the interior of the hollow mixer shaft 13, from where it is immersed through glue centrifugal pipes 28, which have their outlet openings 29 in the mixture ring 30 built up on the inner wall of the mixing container 1 due to the far supercritical speed of the mixer shaft 13, is thrown out. A separating disc 31 is arranged in the hollow mixer shaft 13 between the mutually adjacent ends of the cooling water supply pipe 21 and the glue supply pipe 26.

Der Bereich des Mischbehälters 1, über den sich der Mischgutzulauftrichter 6 mit seiner Mischgutzulauföffnung 7 in Längsrichtung des Mischbehälters 1 erstreckt, bildet eine Einzugszone A für das Mischgut, üblicherweise also Holzspäne, in der das Mischgut mit auf der Mischwerkswelle 13 angebrachten, schaufelartig ausgebildeten ringbildenden Einzugswerkzeugen 32 so stark radial beschleunigt wird, daß sich der bereits erwähnte Mischgutring 30 bildet. Der sich an die Einzugszone A anschließende Längenbereich des Mischbehälters 1, über den die Leimschleuderrohre 28 auf der hohlen Mischwerkswelle 13 angebracht sind, bildet eine Leimzugabezone B. Der sich anschließende Bereich, in dem die gekühlten Mischwerkzeuge 23 auf der Mischwerkswelle 13 angeordnet sind, ist eine Nachmischzone C. Der Mischbehälter 1 ist samt Lagern 14, 15 über ein Maschinengestell 33 gegenüber dem Boden 34 abgestützt.The area of the mixing container 1, over which the mixed material feed funnel 6 extends with its mixed material supply opening 7 in the longitudinal direction of the mixing container 1, forms a feed zone A for the mixed material, usually wood chips, in which the mixed material with ring-shaped ring-forming pull-in tools attached to the mixer shaft 13 32 is accelerated radially so much that the already mentioned mixture ring 30 forms. The length region of the mixing container 1 adjoining the feed zone A, via which the glue centrifuge tubes 28 are attached to the hollow mixer shaft 13, forms a glue addition zone B. The adjoining region in which the cooled mixing tools 23 are arranged on the mixer shaft 13 is one Post-mixing zone C. The mixing container 1 together with bearings 14, 15 is supported against the floor 34 by a machine frame 33.

Ein derartiger Mischer ist beispielsweise aus der DE-C 20 57 594 (entsprechend US-A 3 734471) bzw. der DE-A2717896 bekannt.Such a mixer is known for example from DE-C 20 57 594 (corresponding to US-A 3 734471) or DE-A2717896.

Anstelle der Leimzuführung durch die hohl ausgebildete Mischwerkswelle, d.h. anstelle einer sogenannten Innenbeleimung, kann auch eine sogenannte Außenbeleimung vorgesehen sein, bei der im gleichen Mischbehälterabschnitt B von außen Leimzugaberöhrchen den Kühlmantel 3 und den Innentrog 2 durchdringen, die mit ihren Auslauföffnungen ebenfalls im Mischgutring 30 enden. Eine solche Ausgestaltung ist beispielsweise aus der DE-A 2219 352 bekannt.Instead of the glue supply through the hollow mixer shaft, i.e. Instead of a so-called inner gluing, a so-called outer gluing can also be provided, in which in the same mixing container section B glue addition tubes penetrate the cooling jacket 3 and the inner trough 2 from the outside, which also end with their outlet openings in the mixture ring 30. Such an embodiment is known for example from DE-A 2219 352.

Aus dem Inneraum 1' des Mischbehälters 1 mündet eine Mischgutauslauföffnung 35 in den Mischgutauslauftrichter 8. Diese Auslauföffnung 35 ist in an sich bekannter Weise mittels einer dem Verlauf des Inentroges 2 im Bereich dieser Mischgutauslauföffnung 35 angepaßten Drosselklappe 36 verschließbar, die an ihrer oberen, achsparallelen Kante mittels Schwenkgelenken 37 am Mischbehälter 1 angelenkt ist und durch den Druck des Mischgutes aus der in Fig. 2 dargestellten geschlossenen Stellung nach unten und zur Seite (in Fig. 2 nach rechts) entsprechend dem Schwenkrichtungspfeil38 verschwenkt werden kann, so daß die Mischgutauslauföffnung 35 mehr oder weniger geöffnet wird, so daß wiederum die in Drehrichtung 39 sich bewegenden Mischwerkzeuge 23 das Mischgut durch die dann mehr oder weniger geöffnete Mischgutauslauföffnung 35 in den Mischgutauslauftrichter8 ausschleudern.From the inner space 1 'of the mixing container 1, a mixture outlet opening 35 opens into the outlet outlet funnel 8. This outlet opening 35 can be closed in a manner known per se by means of a throttle valve 36 which is adapted to the course of the inner trough 2 in the region of this outlet outlet opening 35 and which is on its upper, axially parallel edge is articulated by means of swivel joints 37 on the mixing container 1 and can be swiveled downward and to the side (in FIG. 2 to the right) according to the swivel direction arrow 38 by the pressure of the mixed material from the closed position shown in FIG. 2, so that the mixed material outlet opening 35 more or is opened less so that, in turn, the mixing tools 23 moving in the direction of rotation 39 eject the material to be mixed through the material outlet opening 35, which is then more or less open, into the material outlet funnel 8.

An der Außenseite der Drosselklappe 36 ist eine Konsole 40 angebracht, an der eine sich bei geschlossener Drosselklappe 36 etwa horizontal nach außen erstreckende Führungsstange 41 starr befestigt ist. Auf der Führungsstange 41 ist mittels einer Führungsbüchse 42 das Statorgehäuse 43 eines handelsüblichen Spindelmotors 44 verschiebbar gelagert. Die Spindel 45 des Spindelmotors 44 ist mit ihrem dem Mischbehälter 1 zugewandten Ende an der Konsole 40 mit Spiel angelenkt, wobei die Anordnung so getroffen ist, daß die Führungsstange 41 einerseits und die Spindel45 andererseits parallel zueinander verlaufen. Bei Betätigung des Spindelmotors 44 verschiebt sich dessen Statorgehäuse 43, da die Spindel 45 an der Konsole 40 festgehalten wird, axial auf der Führungsstange 41, so daß hierdurch der Schwerpunktabstand des Statorgehäuses 43 des Spindelmotors 44 zur durch die Schwenkgelenke37 gebildeten Schwenkachse der Drosselklappe 36 verändert wird. Anstelle des spindelmotors 44 kann ein doppelseitig beaufschlagbarer hydraulischer Arbeitszylinder46 vorgesehen sein, dessen Kolbenstange 47 an der Konsole 40 angelenkt ist, während der Zylinder 48 mittels einer Führungsbüchse 42 auf der Führungsstange 41 verschiebbar geführt ist. Die beiden Druckflüssigkeitszu- und -abführleitungen 49, 50 sind in Fig. 3 nur angedeutet.On the outside of the throttle valve 36, a bracket 40 is attached, to which a guide rod 41 which extends approximately horizontally outwards when the throttle valve 36 is closed is rigidly attached. The stator housing 43 of a commercially available spindle motor 44 is displaceably mounted on the guide rod 41 by means of a guide bush 42. The spindle 45 of the spindle motor 44 is articulated with its end facing the mixing container 1 on the console 40 with play, the arrangement being such that the guide rod 41 on the one hand and the spindle 45 on the other hand run parallel to one another. When the spindle motor 44 is actuated, its stator housing 43 shifts axially on the guide rod 41 since the spindle 45 is held on the bracket 40, so that the center of gravity distance of the stator housing 43 of the spindle motor 44 to the pivot axis of the throttle valve 36 formed by the pivot joints 37 is changed . Instead of the spindle motor 44, a double-acting hydraulic working cylinder 46 can be provided, the piston rod 47 of which is articulated on the bracket 40, while the cylinder 48 is displaceably guided on the guide rod 41 by means of a guide bush 42. The two hydraulic fluid supply and discharge lines 49, 50 are only indicated in FIG. 3.

Die vorerwähnte Regelung ist wie folgt aufgebaut : In den Stromkreis 51 des Motors 16 ist ein Stromtransformator 52 geschaltet, der eine der Stromaufnahme des Motors 16 proportionale Spannung abgibt, die in einem Bruckengleichrichter53 gleichgerichtet wird. Dieses Gleichspannungssignal wird dann einem Regler 54 zugeführt, wo es in einem Widerstand 55 in einen entsprechenden Strom umgewandelt wird. Dieser Strom ist als Gleichstrom proportional der Stromaufnahme des Motors. Parallel zu dem Widerstand 55 ist als Sollwert-Geber ein Potentiometer 56 geschaltet, dessen Ausgang mit dem Ausgang des Widerstandes 55 zusammengeschaltet ist. An diesem Zusammenschaltungspunkt 57 werden der aus dem Sollwertgeber und der aus dem Widerstand 55 jeweils kommende Strom aufeinanderaddiert. Aus dem Sollwertgeber wird jeweils ein negativer Strom vorgegeben, während aus dem Potentiometer 55 ein positiver Strom vorgegeben wird. Dem Zusammenschaltungspunkt57 ist ein Operationsverstärker58 nachgeschaltet, der je nach dem, ob vom Zusammenschaltungspunkt 57 eine positive oder negative Stromdifferenz auf den Operationsverstärker gegeben wird, ein entsprechendes Signal auf einen dem Regler54 nachgeschalteten Leistungsverstärker 59 gepumpt. Vom Leistungsverstärker 59 aus wird dann der Spindelmotor44 angesteuert und sein Statorgehäuse 43 solange auf der Führungsstange 41 verfahren, bis die Stromaufnahme des Motors 16 wieder mit dem am Potentiometer 56 vorgegebenen Sollwert übereinstimmt.The above-mentioned regulation is structured as follows: In the circuit 51 of the motor 16, a current transformer 52 is connected, which outputs a voltage proportional to the current consumption of the motor 16, which voltage is rectified in a bridge rectifier 53. This DC voltage signal is then fed to a controller 54, where it is converted into a corresponding current in a resistor 55. As a direct current, this current is proportional to the current consumption of the motor. A potentiometer 56 is connected in parallel with the resistor 55 as a setpoint generator, the output of which is connected to the output of the resistor 55. At this interconnection point 57, the current coming from the setpoint generator and the current coming from the resistor 55 are added together. A negative current is specified in each case from the setpoint generator, while a positive current is specified from potentiometer 55. An operational amplifier 58 is connected downstream of the interconnection point 57 and, depending on whether a positive or negative current difference is applied to the operational amplifier from the interconnection point 57, pumps a corresponding signal to a power amplifier 59 connected downstream of the controller 54. The spindle motor 44 is then controlled by the power amplifier 59 and move its stator housing 43 on the guide rod 41 until the current consumption of the motor 16 again matches the setpoint specified on the potentiometer 56.

Bei der hydraulischen Ausführung nach den Fig. und 5 ist dem Leistungsverstärker 59 ein Magnetventil 60 nachgeschaltet, das die Hydraulikversorgung entweder auf die Flüssigkeitsleitung 49 oder 50 schaltet, wobei dann die jeweils andere Flüssigkeitsleitung als drucklose Rücklaufleitung dient. Ansonsten ist die gesamte Schaltung gleich.5 and 5, the power amplifier 59 is followed by a solenoid valve 60 which switches the hydraulic supply either to the liquid line 49 or 50, the other liquid line then serving as the unpressurized return line. Otherwise, the entire circuit is the same.

Anstelle der beiden vorerwähnten Ausführungsformen kann naturgemäß auch ein Gegengewicht vorgesehen sein, das von einem mit diesem zwar gekoppelten, aber gesondert und ortsfest an der Drosselklappe 36 angebrachten Motor mittels einer Spindel auf einer Führungsstange verschiebbar ist. Der Antrieb erfolgt hierbei zweckmäßigerweise über ein Vorgelegegetriebe. Da es in einem solchen Fall insbesondere zweckmäßig wäre, den Motor achsparallel zu den Schwenkgelenken 37 vorzusehen, müßte in einem solchen Fall auch noch ein Kegeltrieb vorgesehen sein.Instead of the two aforementioned embodiments, a counterweight can naturally also be provided, which can be displaced by means of a spindle on a guide rod by a motor which is coupled to it, but separately and fixedly attached to the throttle valve 36. The drive is expediently carried out via a countershaft transmission. Since in such a case it would be particularly expedient to provide the motor axially parallel to the swivel joints 37, a bevel drive would also have to be provided in such a case.

Claims (7)

1. Mixer for the continuous glueing of wood chips, fibres or the like, consisting of a cylindrical mixing vessel (1) which comprises a mix inlet opening (7) at one end and a mix outlet opening (35) at the other end and in which there is coaxially arranged a mixer shaft (13) which is driven at a high rotational speed by a drive motor (16), is equipped with mixing tools (23) and conveys the mixing material in the form of a circular mix (30) through the mixing vessel (1), facilities being provided for feeding glue into the mixing vessel (1) and a throttle valve (36) which is provided with a spacing-adjustable counterweight being provided in the mix outlet opening (35), characterised in that the counterweight can be adjusted by a motor, the said counterweight itself being formed by the housing (43, 48) of a motor (44, 46).
2. Mixer according to Claim 1, characterised in that the counterweight is the actuator of a closed control loop for keeping constant the current or power input of the drive motor (16) of the mixer shaft (13).
3. Mixer according to Claim 1 or 2, characterised in that the counterweight can be adjusted by an electromotor.
4. Mixer according to Claim 1 or 2, characterised in that the counterweight can be adjusted by a hydraulic motor.
5. Mixer according to Claim 1, characterised in that the housing (43, 48) of the motor (44, 46) is slidably mounted on a guide rod (41) which is rigidly attached to the throttle (36).
6. Mixer according to Claim 1 or 5, characterised in that the counterweight is the housing (43) of a spindle motor (44), the spindle (45) of which is attached to the throttle (36).
7. Mixer according to Claim 1 or 5, characterised in that the counterweight is the cylinder (48) of a hydraulic working cylinder (46), the piston rod (47) of which is connected to the throttle (36).
EP80103071A 1979-06-09 1980-06-03 Mixer for the continuous glueing of wood chips, wood fibres or the like Expired EP0023253B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80103071T ATE1046T1 (en) 1979-06-09 1980-06-03 MIXER FOR CONTINUOUS GLUEING OF WOOD CHIPS, FIBERS OR. DGL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792923502 DE2923502A1 (en) 1979-06-09 1979-06-09 MIXER FOR CONTINUOUS GLUING OF WOODCHIPS, FIBERS OR THE LIKE.
DE2923502 1979-06-09

Publications (2)

Publication Number Publication Date
EP0023253A1 EP0023253A1 (en) 1981-02-04
EP0023253B1 true EP0023253B1 (en) 1982-05-19

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Application Number Title Priority Date Filing Date
EP80103071A Expired EP0023253B1 (en) 1979-06-09 1980-06-03 Mixer for the continuous glueing of wood chips, wood fibres or the like

Country Status (5)

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US (1) US4316671A (en)
EP (1) EP0023253B1 (en)
JP (1) JPS55165133A (en)
AT (1) ATE1046T1 (en)
DE (2) DE2923502A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4002099A1 (en) * 1990-01-25 1991-08-01 Draiswerke Gmbh MIXER
US7563017B1 (en) * 2002-09-06 2009-07-21 Bracegirdle Paul E Process for mixing congealable materials such as cement, asphalt, and glue with fibers from waste carpet
JP3908635B2 (en) * 2002-09-18 2007-04-25 株式会社神戸製鋼所 Heat exchange mechanism and rotor having the same
DE202004008213U1 (en) * 2004-05-18 2004-08-05 Hfhn Wood Engineering Gmbh gluing device
DE102011013136A1 (en) * 2011-03-04 2012-10-11 Reiflock Abwassertechnik Gmbh Apparatus for producing a polymer solution
RU2648388C1 (en) * 2017-07-10 2018-03-26 Федеральное государственное бюджетное образовательное учреждение высшего образования "Поволжский государственный технологический университет" Device for wood concrete manufacturing
DE102018005898A1 (en) * 2018-07-26 2020-01-30 Siempelkamp Maschinen- Und Anlagenbau Gmbh Process for mixing fibers or chips with binder
CN109178505B (en) * 2018-09-21 2023-09-05 承德石油高等专科学校 Glycine bagging equipment and application process thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1077884C2 (en) * 1957-03-22 1962-05-03 Pollux G M B H Switching device for liquid compound meters
US3231146A (en) * 1964-04-02 1966-01-25 Simpson Herbert Corp Controlled rate discharge device
DE2113960C3 (en) * 1970-11-24 1981-06-19 Draiswerke Gmbh, 6800 Mannheim Device for continuous mixing of solids with liquids
DE7707372U1 (en) * 1977-03-10 1978-09-14 Herfeld, Friedrich Walter, Dr., 5982 Neuenrade MIXER WITH A SPOUT DEVICE
DE2717896A1 (en) * 1977-04-22 1978-10-26 Draiswerke Gmbh Continuous mixer esp. for glue and (wood) chips or fibres - has end discharge weir and additional small variable outlet

Also Published As

Publication number Publication date
DE3060442D1 (en) 1982-07-08
JPS55165133A (en) 1980-12-23
EP0023253A1 (en) 1981-02-04
US4316671A (en) 1982-02-23
DE2923502A1 (en) 1980-12-11
ATE1046T1 (en) 1982-06-15
JPS6354416B2 (en) 1988-10-27

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